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  • Voice Recognition Connection problem

    - by user244190
    I,m trying to work through and test a Voice Recognition example based on the VoiceRecognition.java example at http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/VoiceRecognition.html but when click on the button to create the activity, I get a dialog that says Connection problem. My Manifest file is using the Internet Permission, and I understand it passes the to the Google Servers. Do I need to do anything else to use this. Code below UPDATE 2: Thanks to Steve, I have been able to install the USB Driver and debug the app directly on my Droid. Here is the LogCat output from clicking on my mic button: 03-08 18:36:45.686: INFO/ActivityManager(1017): Starting activity: Intent { act=android.speech.action.RECOGNIZE_SPEECH cmp=com.google.android.voicesearch/.IntentApiActivity (has extras) } 03-08 18:36:45.686: WARN/ActivityManager(1017): Activity is launching as a new task, so cancelling activity result. 03-08 18:36:45.787: DEBUG/NetworkLocationProvider(1017): setMinTime: 120000 03-08 18:36:45.889: INFO/ActivityManager(1017): Displayed activity com.google.android.voicesearch/.IntentApiActivity: 135 ms (total 135 ms) 03-08 18:36:45.905: DEBUG/NetworkLocationProvider(1017): onCellLocationChanged [802,0,0,4192,3] 03-08 18:36:45.951: INFO/MicrophoneInputStream(1429): Starting voice recognition with audio source VOICE_RECOGNITION 03-08 18:36:45.998: DEBUG/AudioHardwareMot(990): Codec sampling rate already 16000 03-08 18:36:46.092: INFO/RecognitionService(1429): ssfe url=http://www.google.com/m/voice-search 03-08 18:36:46.092: WARN/RecognitionService(1429): required parameter 'calling_package' is missing in IntentAPI request 03-08 18:36:46.115: DEBUG/AudioHardwareMot(990): Codec sampling rate already 16000 03-08 18:36:46.131: WARN/InputManagerService(1017): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@4487d240 (uid=10090 pid=3132) 03-08 18:36:46.131: WARN/IInputConnectionWrapper(3132): showStatusIcon on inactive InputConnection 03-08 18:36:46.248: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.334: DEBUG/dalvikvm(3206): GC freed 3682 objects / 369416 bytes in 293ms 03-08 18:36:46.358: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.412: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.444: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.475: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.506: WARN/MediaPlayer(1429): info/warning (1, 44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) 03-08 18:36:46.514: INFO/MediaPlayer(1429): Info (1,44) The line that concerns me is the warning of the missing parameter calling-package. UPDATE: Ok, I was able to replace my emulator image with one from HTC that appears to come with Google Voice Search, however now when I run from the emulator, i'm getting an Audio Problem message with Speak Again or Cancel buttons. It appears to make it back to the onActivityResult(), but the resultCode is 0. Here is the LogCat output: 03-07 20:21:25.396: INFO/ActivityManager(578): Starting activity: Intent { action=android.speech.action.RECOGNIZE_SPEECH comp={com.google.android.voicesearch/com.google.android.voicesearch.RecognitionActivity} (has extras) } 03-07 20:21:25.406: WARN/ActivityManager(578): Activity is launching as a new task, so cancelling activity result. 03-07 20:21:25.968: WARN/ActivityManager(578): Activity pause timeout for HistoryRecord{434f7850 {com.ikonicsoft.mileagegenie/com.ikonicsoft.mileagegenie.MileageGenie}} 03-07 20:21:26.206: WARN/AudioHardwareInterface(554): getInputBufferSize bad sampling rate: 16000 03-07 20:21:26.256: ERROR/AudioRecord(819): Recording parameters are not supported: sampleRate 16000, channelCount 1, format 1 03-07 20:21:26.696: INFO/ActivityManager(578): Displayed activity com.google.android.voicesearch/.RecognitionActivity: 1295 ms 03-07 20:21:29.890: DEBUG/dalvikvm(806): threadid=3: still suspended after undo (s=1 d=1) 03-07 20:21:29.896: INFO/dalvikvm(806): Uncaught exception thrown by finalizer (will be discarded): 03-07 20:21:29.896: INFO/dalvikvm(806): Ljava/lang/IllegalStateException;: Finalizing cursor android.database.sqlite.SQLiteCursor@435d3c50 on ml_trackdata that has not been deactivated or closed 03-07 20:21:29.896: INFO/dalvikvm(806): at android.database.sqlite.SQLiteCursor.finalize(SQLiteCursor.java:596) 03-07 20:21:29.896: INFO/dalvikvm(806): at dalvik.system.NativeStart.run(Native Method) 03-07 20:21:31.468: DEBUG/dalvikvm(806): threadid=5: still suspended after undo (s=1 d=1) 03-07 20:21:32.436: WARN/IInputConnectionWrapper(806): showStatusIcon on inactive InputConnection I,m still not sure why I,m getting the Connect problem on the Droid. I can use Voice Search ok. I also tried clearing the cache, and data as described in some posts, butstill not working?? /** * Fire an intent to start the speech recognition activity. */ private void startVoiceRecognitionActivity() { Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo"); startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE); } /** * Handle the results from the recognition activity. */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) { // Fill the list view with the strings the recognizer thought it could have heard ArrayList<String> matches = data.getStringArrayListExtra( RecognizerIntent.EXTRA_RESULTS); mList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, matches)); } super.onActivityResult(requestCode, resultCode, data); }

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  • Android: Strange out of memory issue

    - by Chrispix
    I am not sure where to start to explain this one. I have a list view with a couple image buttons on each row. When you click the list row, it launches a new activity. If you review some of my other posts, I have had to build my own tabs because of an issue w/ the camera layout. The activity that gets launched for result is a map. If I click on my button to launch the image preview (load an image off the sd card) the application returns from the activity back to the listview activity to the result handler to relaunch my new activity which is nothing more than an image widget. So here is the issue, the image preview on the list view is being done w/ the cursor & listadapter. This makes it pretty simple, but I am not sure how I can put a resized (i.e. smaller bit size not pixel) image as the src for the imgbutton on the fly. So I just resized the image that came off the phone camera. The issue is that I get an out of memory error when it tries to go back and re-launch the 2nd activity. ** My question : is there a way I can build the list adapter easily row by row, where I can resize on the fly (bit wise)? - this would be preferable as I also need to make some changes to the properties of the widgets/elements in each row as I am unable to select a row w/ touch screen b/c of focus issue. (I can use roller ball). ** I know I can do an out of band resize and save of my image, but that is not really what I want to do, but some sample code for that would be nice if that is your suggestion. As soon as I disabled the image on the listview it worked fine again. FYI : This is how I was doing it : String[] from = new String[] { DBHelper.KEY_BUSINESSNAME, DBHelper.KEY_ADDRESS, DBHelper.KEY_CITY, DBHelper.KEY_GPSLONG, DBHelper.KEY_GPSLAT, DBHelper.KEY_IMAGEFILENAME + ""}; to = new int[] { R.id.businessname, R.id.address, R.id.city, R.id.gpslong, R.id.gpslat, R.id.imagefilename }; notes = new SimpleCursorAdapter(this, R.layout.notes_row, c, from, to); setListAdapter(notes); Where R.id.imagefilename is a ButtonImage Here is my LogCat 01-25 05:05:49.877: ERROR/dalvikvm-heap(3896): 6291456-byte external allocation too large for this process. 01-25 05:05:49.877: ERROR/(3896): VM won't let us allocate 6291456 bytes 01-25 05:05:49.877: ERROR/AndroidRuntime(3896): Uncaught handler: thread main exiting due to uncaught exception 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): java.lang.OutOfMemoryError: bitmap size exceeds VM budget 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:304) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:149) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:174) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.graphics.drawable.Drawable.createFromPath(Drawable.java:729) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.ImageView.resolveUri(ImageView.java:484) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.ImageView.setImageURI(ImageView.java:281) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.SimpleCursorAdapter.setViewImage(SimpleCursorAdapter.java:183) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:129) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.CursorAdapter.getView(CursorAdapter.java:150) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.AbsListView.obtainView(AbsListView.java:1057) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.ListView.makeAndAddView(ListView.java:1616) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.ListView.fillSpecific(ListView.java:1177) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.ListView.layoutChildren(ListView.java:1454) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.AbsListView.onLayout(AbsListView.java:937) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.View.layout(View.java:5611) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1108) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.onLayout(LinearLayout.java:922) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.View.layout(View.java:5611) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.FrameLayout.onLayout(FrameLayout.java:294) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.View.layout(View.java:5611) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:999) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.LinearLayout.onLayout(LinearLayout.java:920) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.View.layout(View.java:5611) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.widget.FrameLayout.onLayout(FrameLayout.java:294) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.View.layout(View.java:5611) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.ViewRoot.performTraversals(ViewRoot.java:771) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.view.ViewRoot.handleMessage(ViewRoot.java:1103) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.os.Handler.dispatchMessage(Handler.java:88) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.os.Looper.loop(Looper.java:123) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at android.app.ActivityThread.main(ActivityThread.java:3742) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at java.lang.reflect.Method.invokeNative(Native Method) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at java.lang.reflect.Method.invoke(Method.java:515) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497) 01-25 05:05:49.917: ERROR/AndroidRuntime(3896): at dalvik.system.NativeStart.main(Native Method) 01-25 05:10:01.127: ERROR/AndroidRuntime(3943): ERROR: thread attach failed I also have a new error when displaying an image : 01-25 22:13:18.594: DEBUG/skia(4204): xxxxxxxxxxx jpeg error 20 Improper call to JPEG library in state %d 01-25 22:13:18.604: INFO/System.out(4204): resolveUri failed on bad bitmap uri: 01-25 22:13:18.694: ERROR/dalvikvm-heap(4204): 6291456-byte external allocation too large for this process. 01-25 22:13:18.694: ERROR/(4204): VM won't let us allocate 6291456 bytes 01-25 22:13:18.694: DEBUG/skia(4204): xxxxxxxxxxxxxxxxxxxx allocPixelRef failed

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  • Batch break up after call other batch file

    - by Sven Arno Jopen
    i have the problem, that my batch process breaking up each time after call a other batch file. The batch files are used to run a make process out from IBM Rhapsody. There convert the call from Rhapsody to the Visual Studio tools. So nmake will be called from the batch after make different settings. The scripts aren’t written completely from me, I only adapt theme to run under both windows architecture versions, x86 and x64. The first script (vs2005_make.bat) will be called from Rhapsody and run to the “call” statement. The second script (Vcvars_VisualStudio2005.bat) runs to the end. But the first script isn’t resume working, at this point the process break up without a error message. I'm not very familiar with batch files, this is the first time I make more than simple console commands in a batch file. So I hope I have given all information’s which needed, otherwise ask me. Here the start script (vs2005_make.bat): :: parameter 1 - Makefile which should be used :: parameter 2 - The make target mark @echo off IF "%2"=="" set target=all IF "%2"=="all" set target=all IF "%2"=="build" set target=all IF "%2"=="rebuild" set target=clean all IF "%2"=="clean" set target=clean set RegQry="HKLM\Hardware\Description\System\CentralProcessor\0" REG.exe Query %RegQry% > checkOS.txt Find /i "x86" < CheckOS.txt > StringCheck.txt IF %ERRORLEVEL%==0 ( set arch=x86 ) ELSE ( set arch=x64 ) call "%ProgramFiles%\IBM\Rhapsody752\Share\etc\Vcvars_VisualStudio2005.bat" %arch% IF %ERRORLEVEL%==0 ( set makeflags= nmake /nologo /S /F %1 %target% ) del checkOS.txt del StringCheck.txt exit and here the called script (Vcvars_VisualStudio2005.bat): :: param 1 - Processor architecture @echo off ECHO param 1 = %1 IF %1==x86 ( SET ProgrammPath=%ProgramFiles% ) ELSE IF %1==x64 ( SET ProgrammPath=%ProgramFiles(x86)% ) ELSE ( ECHO Unknowen architectur EXIT /B 1 ) SET VSINSTALLDIR="%ProgrammPath%\Microsoft Visual Studio 8\Common7\IDE" SET VCINSTALLDIR="%ProgrammPath%\Microsoft Visual Studio 8" SET FrameworkDir=C:\WINDOWS\Microsoft.NET\Framework SET FrameworkVersion=v2.0.50727 SET FrameworkSDKDir="%ProgrammPath%\Microsoft Visual Studio 8\SDK\v2.0" rem Root of Visual Studio common files. IF %VSINSTALLDIR%=="" GOTO Usage IF %VCINSTALLDIR%=="" SET VCINSTALLDIR=%VSINSTALLDIR% rem rem Root of Visual Studio ide installed files. rem SET DevEnvDir=%VSINSTALLDIR% rem rem Root of Visual C++ installed files. rem SET MSVCDir=%VCINSTALLDIR%\VC SET PATH=%DevEnvDir%;%MSVCDir%\BIN;%VCINSTALLDIR%\Common7\Tools;%VCINSTALLDIR%Common7 \Tools\bin\prerelease;%VCINSTALLDIR%\Common7\Tools\bin;%FrameworkSDKDir%\bin;%FrameworkDir%\%FrameworkVersion%;%PATH%; SET INCLUDE=%MSVCDir%\ATLMFC\INCLUDE;%MSVCDir%\INCLUDE;%MSVCDir%\PlatformSDK\include\gl;%MSVCDir%\PlatformSDK\include;%FrameworkSDKDir%\include;%INCLUDE% SET LIB=%MSVCDir%\ATLMFC\LIB;%MSVCDir%\LIB;%MSVCDir%\PlatformSDK\lib;%FrameworkSDKDir%\lib;%LIB% GOTO end :Usage ECHO. VSINSTALLDIR variable is not set. ECHO. ECHO SYNTAX: %0 GOTO end :end Here the console output, what I not understand here and find very suspicious is that after the “IF %ERRORLEVEL%” Statement in the first script all will be put out regardless the echo is set to off… Executing: "C:\Programme\IBM\Rhapsody752\Share\etc\vs2005_make.bat" Simulation.mak build IF %ERRORLEVEL%==0 ( Mehr? set arch=x86 Mehr? ) ELSE ( Mehr? set arch=x64 Mehr? ) call "%ProgramFiles%\IBM\Rhapsody752\Share\etc\Vcvars_VisualStudio2005.bat" %arch% :: param 1 - Processor architecture @echo off ECHO param 1 = %1 param 1 = x86 IF %1==x86 ( Mehr? SET ProgrammPath=%ProgramFiles% Mehr? ) ELSE IF %1==x64 ( Mehr? SET ProgrammPath=%ProgramFiles(x86)% Mehr? ) ELSE ( Mehr? ECHO Unknowen architectur Mehr? EXIT /B 1 Mehr? ) SET VSINSTALLDIR="%ProgrammPath%\Microsoft Visual Studio 8\Common7\IDE" SET VCINSTALLDIR="%ProgrammPath%\Microsoft Visual Studio 8" SET FrameworkDir=C:\WINDOWS\Microsoft.NET\Framework SET FrameworkVersion=v2.0.50727 SET FrameworkSDKDir="%ProgrammPath%\Microsoft Visual Studio 8\SDK\v2.0" rem Root of Visual Studio common files. IF %VSINSTALLDIR%=="" GOTO Usage IF %VCINSTALLDIR%=="" SET VCINSTALLDIR=%VSINSTALLDIR% rem rem Root of Visual Studio ide installed files. rem SET DevEnvDir=%VSINSTALLDIR% rem rem Root of Visual C++ installed files. rem SET MSVCDir=%VCINSTALLDIR%\VC SET PATH=%DevEnvDir%;%MSVCDir%\BIN;%VCINSTALLDIR%\Common7\Tools;%VCINSTALLDIR%\Common7\Tools\bin\prerelease;%VCINSTALLDIR%\Common7\Tools\bin;%FrameworkSDKDir%\bin;%FrameworkDir%\%FrameworkVersion%;%PATH%; SET INCLUDE=%MSVCDir%\ATLMFC\INCLUDE;%MSVCDir%\INCLUDE;%MSVCDir%\PlatformSDK\include\gl;%MSVCDir%\PlatformSDK\include;%FrameworkSDKDir%\include;%INCLUDE% SET LIB=%MSVCDir%\ATLMFC\LIB;%MSVCDir%\LIB;%MSVCDir%\PlatformSDK\lib;%FrameworkSDKDir%\lib;%LIB% GOTO end Build Done I hope someone have an idea, i work now since two days and don't find the error... thanking you in anticipation. Note: The word “Mehr?” in the text output is german and means “more”. I don't know were it comes from and it is possible that it is a bad translation from the English output to german.

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  • How do I setup ASP.NET MVC 2 with MySQL?

    - by NovaJoe
    Okay, so I'm cheating and not actually a question, but instead making a flat-out post. I know that goes against the grain of Stack Overflow, but this is too valuable not to share. I'm assuming that you have Visual Studio Professional 2008 and access to an instance of MySQL server. This MAY work with VS2008 Web edition, but not at all sure. If you haven't, install MySQL Connector for .NET (6.2.2.0 at the time of this write-up) Optional: install MySQL GUI Tools If you haven't, install MVC 2 RTM, or better yet, use Microsoft's Web Platform Installer. Create an empty MySQL database. If you don't want to access your application with the MySQL root user account (insecure), create a user account and assign the appropriate privileges (outside the scope of this write-up). Create a new MVC 2 application in Visual Studio In the MVC 2 app, reference MySql.Web.dll. It will either be in your GAC, or in the folder that the MySQL Connector installer put it. Modify the connection strings portion of your web.config: <connectionStrings> <remove name="LocalMySqlServer"/> <add name="MySqlMembershipConnection" connectionString="Data Source=[MySql server host name];user id=[user];password=[password];database=[database name];" providerName="MySql.Data.MySqlClient"/> </connectionStrings> Modify the membership portion of your web.config: <membership defaultProvider="MySqlMembershipProvider"> <providers> <clear/> <add name="MySqlMembershipProvider" type="MySql.Web.Security.MySQLMembershipProvider, MySql.Web, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" connectionStringName="MySqlMembershipConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" autogenerateschema="true"/> </providers> </membership> Modify the role manager portion of your web.config: <roleManager enabled="true" defaultProvider="MySqlRoleProvider"> <providers> <clear /> <add connectionStringName="MySqlMembershipConnection" applicationName="/" name="MySqlRoleProvider" type="MySql.Web.Security.MySQLRoleProvider, MySql.Web, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" autogenerateschema="true"/> </providers> </roleManager> Modify the profile portion of your web.config: <profile> <providers> <clear/> <add type="MySql.Web.Security.MySQLProfileProvider, MySql.Web, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" name="MySqlProfileProvider" applicationName="/" connectionStringName="MySqlMembershipConnection" autogenerateschema="true"/> </providers> </profile> At this point, you ought to be able to run the app and have the default ASP.NET MVC 2 home page come up in your browser. However, it may be a better idea to first run the ASP.NET Web configuration Tool (in Visual Studio top menus: Project - ASP.NET Configuration). Once the tool launches, check out each of the tabs; no errors = all good. The configuration tool Nathan Bridgewater's blog was essential to getting this working. Kudos, Nathan. Look for the "Configuration Tool" heading half way down the page. The public key token on the MySql.web.dll that I've posted here ought not change any time soon. But in case you suspect a bad token string from copying and pasting or whatever, just use the Visual Studio command line to run: "sn -T [Path\to\your.dll]" in order to get the correct public key token. There you have it, ASP.NET MVC 2 running over MySQL. Cheers!

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  • WCF- Large Data

    - by Pinu
    I have a WCF Web Service with basicHTTPBinding , the server side the transfer mode is streamedRequest as the client will be sending us large file in the form of memory stream. But on client side when i use transfer mode as streamedRequest its giving me a this errro "The remote server returned an error: (400) Bad Request" And when i look in to trace information , i see this as the error message Exception: There is a problem with the XML that was received from the network. See inner exception for more details. InnerException: The body of the message cannot be read because it is empty. I am able to send up to 5MB of data using trasfermode as buffered , but it will effect the performance of my web service in the long run , if there are many clients who are trying to access the service in buffered transfer mode. SmartConnect.Service1Client Serv = new SmartConnectClient.SmartConnect.Service1Client(); SmartConnect.OrderCertMailResponse OrderCert = new SmartConnectClient.SmartConnect.OrderCertMailResponse(); OrderCert.UserID = "abcd"; OrderCert.Password = "7a80f6623"; OrderCert.SoftwareKey = "90af1"; string applicationDirectory = @"\\inid\utty\Bran"; byte[] CertMail = File.ReadAllBytes(applicationDirectory + @"\5mb_test.zip"); MemoryStream str = new MemoryStream(CertMail); //OrderCert.Color = true; //OrderCert.Duplex = false; //OrderCert.FirstClass = true; //OrderCert.File = str; //OrderCert.ReturnAddress1 = "Test123"; //OrderCert.ReturnAddress2 = "Test123"; //OrderCert.ReturnAddress3 = "Test123"; //OrderCert.ReturnAddress4 = "Test123"; OrderCert.File = str; //string OrderNumber = ""; //string Password = OrderCert.Password; //int ReturnCode = 0; //string ReturnMessage = ""; //string SoftwareKey = OrderCert.SoftwareKey; //string UserID = OrderCert.UserID; //OrderCert.File = str; MemoryStream FileStr = str; Serv.OrderCertMail(OrderCert); // Serv.OrderCertMail(ref OrderNumber, ref Password, ref ReturnCode, ref ReturnMessage, ref SoftwareKey, ref UserID, ref FileStr ); lblON.Text = OrderCert.OrderNumber; Serv.Close(); // My Web Service - Service Contract [OperationContract] OrderCertMailResponse OrderCertMail(OrderCertMailResponse OrderCertMail); [MessageContract] public class OrderCertMailResponse { string userID = ""; string password = ""; string softwareID = ""; MemoryStream file = null; //MemoryStream str = null; [MessageHeader] //[DataMember] public string UserID { get { return userID; } set { userID = value; } } [MessageHeader] //[DataMember] public string Password { get { return password; } set { password = value; } } [MessageHeader] //[DataMember] public string SoftwareKey { get { return softwareID; } set { softwareID = value; } } [MessageBodyMember] // [DataMember] public MemoryStream File { get { return file; } set { file = value; } } [MessageHeader] //[DataMember] public string ReturnMessage; [MessageHeader] //[DataMember] public int ReturnCode; [MessageHeader] public string OrderNumber; //// Control file fields //[MessageHeader] ////[DataMember] //public string ReturnAddress1; //[MessageHeader] ////[DataMember] //public string ReturnAddress2; //[MessageHeader] ////[DataMember] //public string ReturnAddress3; //[MessageHeader] ////[DataMember] //public string ReturnAddress4; //[MessageHeader] ////[DataMember] //public bool FirstClass; //[MessageHeader] ////[DataMember] //public bool Color; //[MessageHeader] ////[DataMember] //public bool Duplex; } [ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class Service1 : IService1 { public OrderCertMailResponse OrderCertMail(OrderCertMailResponse OrderCertMail) { OrderService CertOrder = new OrderService(); ClientUserInfo Info = new ClientUserInfo(); ControlFileInfo Control = new ControlFileInfo(); //Info.Password = "f2496623"; // hard coded password for development testing purposes //Info.SoftwareKey = "6dbb71"; // hard coded software key this is a developement software key //Info.UserName = "sdfs"; // hard coded UserID - for testing Info.UserName = OrderCertMail.UserID.ToString(); Info.Password = OrderCertMail.Password.ToString(); Info.SoftwareKey = OrderCertMail.SoftwareKey.ToString(); //Control.ReturnAddress1 = OrderCertMail.ReturnAddress1; //Control.ReturnAddress2 = OrderCertMail.ReturnAddress2; //Control.ReturnAddress3 = OrderCertMail.ReturnAddress3; //Control.ReturnAddress4 = OrderCertMail.ReturnAddress4; //Control.CertMailFirstClass = OrderCertMail.FirstClass; //Control.CertMailColor = OrderCertMail.Color; //Control.CertMailDuplex = OrderCertMail.Duplex; //byte[] CertFile = new byte[0]; //byte[] CertFile = null; //string applicationDirectory = @"\\intrepid\utility\Bryan"; // byte[] CertMailFile = File.ReadAllBytes(applicationDirectory + @"\3mb_test.zip"); //MemoryStream str = new MemoryStream(CertMailFile); OrderCertMailResponseClass OrderCertResponse = CertOrder.OrderCertmail(Info,Control,OrderCertMail.File); OrderCertMail.ReturnMessage = OrderCertResponse.ReturnMessage.ToString(); OrderCertMail.ReturnCode = Convert.ToInt32(OrderCertResponse.ReturnCode.ToString()); OrderCertMail.OrderNumber = OrderCertResponse.OrderNumber; return OrderCertMail; }

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  • Problem with room/screen/menu controller in python game: old rooms are not removed from memory

    - by Jordan Magnuson
    I'm literally banging my head against a wall here (as in, yes, physically, at my current location, I am damaging my cranium). Basically, I've got a Python/Pygame game with some typical game "rooms", or "screens." EG title screen, high scores screen, and the actual game room. Something bad is happening when I switch between rooms: the old room (and its various items) are not removed from memory, or from my event listener. Not only that, but every time I go back to a certain room, my number of event listeners increases, as well as the RAM being consumed! (So if I go back and forth between the title screen and the "game room", for instance, the number of event listeners and the memory usage just keep going up and up. The main issue is that all the event listeners start to add up and really drain the CPU. I'm new to Python, and don't know if I'm doing something obviously wrong here, or what. I will love you so much if you can help me with this! Below is the relevant source code. Complete source code at http://www.necessarygames.com/my_games/betraveled/betraveled_src0328.zip MAIN.PY class RoomController(object): """Controls which room is currently active (eg Title Screen)""" def __init__(self, screen, ev_manager): self.room = None self.screen = screen self.ev_manager = ev_manager self.ev_manager.register_listener(self) self.room = self.set_room(config.room) def set_room(self, room_const): #Unregister old room from ev_manager if self.room: self.room.ev_manager.unregister_listener(self.room) self.room = None #Set new room based on const if room_const == config.TITLE_SCREEN: return rooms.TitleScreen(self.screen, self.ev_manager) elif room_const == config.GAME_MODE_ROOM: return rooms.GameModeRoom(self.screen, self.ev_manager) elif room_const == config.GAME_ROOM: return rooms.GameRoom(self.screen, self.ev_manager) elif room_const == config.HIGH_SCORES_ROOM: return rooms.HighScoresRoom(self.screen, self.ev_manager) def notify(self, event): if isinstance(event, ChangeRoomRequest): if event.game_mode: config.game_mode = event.game_mode self.room = self.set_room(event.new_room) #Run game def main(): pygame.init() screen = pygame.display.set_mode(config.screen_size) ev_manager = EventManager() spinner = CPUSpinnerController(ev_manager) room_controller = RoomController(screen, ev_manager) pygame_event_controller = PyGameEventController(ev_manager) spinner.run() EVENT_MANAGER.PY class EventManager: #This object is responsible for coordinating most communication #between the Model, View, and Controller. def __init__(self): from weakref import WeakKeyDictionary self.last_listeners = {} self.listeners = WeakKeyDictionary() self.eventQueue= [] self.gui_app = None #---------------------------------------------------------------------- def register_listener(self, listener): self.listeners[listener] = 1 #---------------------------------------------------------------------- def unregister_listener(self, listener): if listener in self.listeners: del self.listeners[listener] #---------------------------------------------------------------------- def clear(self): del self.listeners[:] #---------------------------------------------------------------------- def post(self, event): # if isinstance(event, MouseButtonLeftEvent): # debug(event.name) #NOTE: copying the list like this before iterating over it, EVERY tick, is highly inefficient, #but currently has to be done because of how new listeners are added to the queue while it is running #(eg when popping cards from a deck). Should be changed. See: http://dr0id.homepage.bluewin.ch/pygame_tutorial08.html #and search for "Watch the iteration" print 'Number of listeners: ' + str(len(self.listeners)) for listener in list(self.listeners): #NOTE: If the weakref has died, it will be #automatically removed, so we don't have #to worry about it. listener.notify(event) def notify(self, event): pass #------------------------------------------------------------------------------ class PyGameEventController: """...""" def __init__(self, ev_manager): self.ev_manager = ev_manager self.ev_manager.register_listener(self) self.input_freeze = False #---------------------------------------------------------------------- def notify(self, incoming_event): if isinstance(incoming_event, UserInputFreeze): self.input_freeze = True elif isinstance(incoming_event, UserInputUnFreeze): self.input_freeze = False elif isinstance(incoming_event, TickEvent) or isinstance(incoming_event, BoardCreationTick): #Share some time with other processes, so we don't hog the cpu pygame.time.wait(5) #Handle Pygame Events for event in pygame.event.get(): #If this event manager has an associated PGU GUI app, notify it of the event if self.ev_manager.gui_app: self.ev_manager.gui_app.event(event) #Standard event handling for everything else ev = None if event.type == QUIT: ev = QuitEvent() elif event.type == pygame.MOUSEBUTTONDOWN and not self.input_freeze: if event.button == 1: #Button 1 pos = pygame.mouse.get_pos() ev = MouseButtonLeftEvent(pos) elif event.type == pygame.MOUSEBUTTONDOWN and not self.input_freeze: if event.button == 2: #Button 2 pos = pygame.mouse.get_pos() ev = MouseButtonRightEvent(pos) elif event.type == pygame.MOUSEBUTTONUP and not self.input_freeze: if event.button == 2: #Button 2 Release pos = pygame.mouse.get_pos() ev = MouseButtonRightReleaseEvent(pos) elif event.type == pygame.MOUSEMOTION: pos = pygame.mouse.get_pos() ev = MouseMoveEvent(pos) #Post event to event manager if ev: self.ev_manager.post(ev) # elif isinstance(event, BoardCreationTick): # #Share some time with other processes, so we don't hog the cpu # pygame.time.wait(5) # # #If this event manager has an associated PGU GUI app, notify it of the event # if self.ev_manager.gui_app: # self.ev_manager.gui_app.event(event) #------------------------------------------------------------------------------ class CPUSpinnerController: def __init__(self, ev_manager): self.ev_manager = ev_manager self.ev_manager.register_listener(self) self.clock = pygame.time.Clock() self.cumu_time = 0 self.keep_going = True #---------------------------------------------------------------------- def run(self): if not self.keep_going: raise Exception('dead spinner') while self.keep_going: time_passed = self.clock.tick() fps = self.clock.get_fps() self.cumu_time += time_passed self.ev_manager.post(TickEvent(time_passed, fps)) if self.cumu_time >= 1000: self.cumu_time = 0 self.ev_manager.post(SecondEvent(fps=fps)) pygame.quit() #---------------------------------------------------------------------- def notify(self, event): if isinstance(event, QuitEvent): #this will stop the while loop from running self.keep_going = False EXAMPLE CLASS USING EVENT MANAGER class Timer(object): def __init__(self, ev_manager, time_left): self.ev_manager = ev_manager self.ev_manager.register_listener(self) self.time_left = time_left self.paused = False def __repr__(self): return str(self.time_left) def pause(self): self.paused = True def unpause(self): self.paused = False def notify(self, event): #Pause Event if isinstance(event, Pause): self.pause() #Unpause Event elif isinstance(event, Unpause): self.unpause() #Second Event elif isinstance(event, SecondEvent): if not self.paused: self.time_left -= 1

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  • Spring security request matcher is not working with regex

    - by Felipe Cardoso Martins
    Using Spring MVC + Security I have a business requirement that the users from SEC (Security team) has full access to the application and FRAUD (Anti-fraud team) has only access to the pages that URL not contains the words "block" or "update" with case insensitive. Bellow, all spring dependencies: $ mvn dependency:tree | grep spring [INFO] +- org.springframework:spring-webmvc:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-asm:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-beans:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-context:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-context-support:jar:3.1.2.RELEASE:compile [INFO] | \- org.springframework:spring-expression:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework:spring-core:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework:spring-web:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework.security:spring-security-core:jar:3.1.2.RELEASE:compile [INFO] | \- org.springframework:spring-aop:jar:3.0.7.RELEASE:compile [INFO] +- org.springframework.security:spring-security-web:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-jdbc:jar:3.0.7.RELEASE:compile [INFO] | \- org.springframework:spring-tx:jar:3.0.7.RELEASE:compile [INFO] +- org.springframework.security:spring-security-config:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework.security:spring-security-acl:jar:3.1.2.RELEASE:compile Bellow, some examples of mapped URL path from spring log: Mapped URL path [/index] onto handler 'homeController' Mapped URL path [/index.*] onto handler 'homeController' Mapped URL path [/index/] onto handler 'homeController' Mapped URL path [/cellphone/block] onto handler 'cellphoneController' Mapped URL path [/cellphone/block.*] onto handler 'cellphoneController' Mapped URL path [/cellphone/block/] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock.*] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock/] onto handler 'cellphoneController' Mapped URL path [/user/update] onto handler 'userController' Mapped URL path [/user/update.*] onto handler 'userController' Mapped URL path [/user/update/] onto handler 'userController' Mapped URL path [/user/index] onto handler 'userController' Mapped URL path [/user/index.*] onto handler 'userController' Mapped URL path [/user/index/] onto handler 'userController' Mapped URL path [/search] onto handler 'searchController' Mapped URL path [/search.*] onto handler 'searchController' Mapped URL path [/search/] onto handler 'searchController' Mapped URL path [/doSearch] onto handler 'searchController' Mapped URL path [/doSearch.*] onto handler 'searchController' Mapped URL path [/doSearch/] onto handler 'searchController' Bellow, a test of the regular expressions used in spring-security.xml (I'm not a regex speciality, improvements are welcome =]): import java.util.Arrays; import java.util.List; public class RegexTest { public static void main(String[] args) { List<String> pathSamples = Arrays.asList( "/index", "/index.*", "/index/", "/cellphone/block", "/cellphone/block.*", "/cellphone/block/", "/cellphone/confirmBlock", "/cellphone/confirmBlock.*", "/cellphone/confirmBlock/", "/user/update", "/user/update.*", "/user/update/", "/user/index", "/user/index.*", "/user/index/", "/search", "/search.*", "/search/", "/doSearch", "/doSearch.*", "/doSearch/"); for (String pathSample : pathSamples) { System.out.println("Path sample: " + pathSample + " - SEC: " + pathSample.matches("^.*$") + " | FRAUD: " + pathSample.matches("^(?!.*(?i)(block|update)).*$")); } } } Bellow, the console result of Java class above: Path sample: /index - SEC: true | FRAUD: true Path sample: /index.* - SEC: true | FRAUD: true Path sample: /index/ - SEC: true | FRAUD: true Path sample: /cellphone/block - SEC: true | FRAUD: false Path sample: /cellphone/block.* - SEC: true | FRAUD: false Path sample: /cellphone/block/ - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock.* - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock/ - SEC: true | FRAUD: false Path sample: /user/update - SEC: true | FRAUD: false Path sample: /user/update.* - SEC: true | FRAUD: false Path sample: /user/update/ - SEC: true | FRAUD: false Path sample: /user/index - SEC: true | FRAUD: true Path sample: /user/index.* - SEC: true | FRAUD: true Path sample: /user/index/ - SEC: true | FRAUD: true Path sample: /search - SEC: true | FRAUD: true Path sample: /search.* - SEC: true | FRAUD: true Path sample: /search/ - SEC: true | FRAUD: true Path sample: /doSearch - SEC: true | FRAUD: true Path sample: /doSearch.* - SEC: true | FRAUD: true Path sample: /doSearch/ - SEC: true | FRAUD: true Tests Scenario 1 Bellow, the important part of spring-security.xml: <security:http entry-point-ref="entryPoint" request-matcher="regex"> <security:intercept-url pattern="^.*$" access="ROLE_SEC" /> <security:intercept-url pattern="^(?!.*(?i)(block|update)).*$" access="ROLE_FRAUD" /> <security:access-denied-handler error-page="/access-denied.html" /> <security:form-login always-use-default-target="false" login-processing-url="/doLogin.html" authentication-failure-handler-ref="authFailHandler" authentication-success-handler-ref="authSuccessHandler" /> <security:logout logout-url="/logout.html" success-handler-ref="logoutSuccessHandler" /> </security:http> Behaviour: FRAUD group **can't" access any page SEC group works fine Scenario 2 NOTE that I only changed the order of intercept-url in spring-security.xml bellow: <security:http entry-point-ref="entryPoint" request-matcher="regex"> <security:intercept-url pattern="^(?!.*(?i)(block|update)).*$" access="ROLE_FRAUD" /> <security:intercept-url pattern="^.*$" access="ROLE_SEC" /> <security:access-denied-handler error-page="/access-denied.html" /> <security:form-login always-use-default-target="false" login-processing-url="/doLogin.html" authentication-failure-handler-ref="authFailHandler" authentication-success-handler-ref="authSuccessHandler" /> <security:logout logout-url="/logout.html" success-handler-ref="logoutSuccessHandler" /> </security:http> Behaviour: SEC group **can't" access any page FRAUD group works fine Conclusion I did something wrong or spring-security have a bug. The problem already was solved in a very bad way, but I need to fix it quickly. Anyone knows some tricks to debug better it without open the frameworks code? Cheers, Felipe

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  • NameNotFoundException when calling a EJB in Weblogic 10.3

    - by XpiritO
    First of all, I'd like to underline that I've already read other posts in StackOverflow (example) with similar questions, but unfortunately I didn't manage to solve this problem with the answers I saw on those posts. I have no intention to repost a question that has already been answered, so if that's the case, I apologize and I'd be thankful to whom points out where the solution is posted. Here is my question: I'm trying to deploy an EJB in WebLogic 10.3.2. The purpose is to use a specific WorkManager to execute work produced in the scope of this component. With this in mind, I've set up a WorkManager (named ResponseTimeReqClass-0) on my WebLogic configuration, using the web-based interface (Environment Work Managers New). Here is a screenshot: Here is my session bean definition and descriptors: OrquestratorRemote.java package orquestrator; import javax.ejb.Remote; @Remote public interface OrquestratorRemote { public void initOrquestrator(); } OrquestratorBean.java package orquestrator; import javax.ejb.Stateless; import com.siemens.ecustoms.orchestration.eCustomsOrchestrator; @Stateless(name = "OrquestratorBean", mappedName = "OrquestratorBean") public class OrquestratorBean implements OrquestratorRemote { public void initOrquestrator(){ eCustomsOrchestrator orquestrator = new eCustomsOrchestrator(); orquestrator.run(); } } META-INF\ejb-jar.xml <?xml version='1.0' encoding='UTF-8'?> <ejb-jar xmlns='http://java.sun.com/xml/ns/javaee' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' metadata-complete='true'> <enterprise-beans> <session> <ejb-name>OrquestradorEJB</ejb-name> <mapped-name>OrquestratorBean</mapped-name> <business-remote>orquestrator.OrquestratorRemote</business-remote> <ejb-class>orquestrator.OrquestratorBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type> </session> </enterprise-beans> <assembly-descriptor></assembly-descriptor> </ejb-jar> META-INF\weblogic-ejb-jar.xml (I've placed work manager configuration in this file, as I've seen on a tutorial on the internet) <weblogic-ejb-jar xmlns="http://www.bea.com/ns/weblogic/90" xmlns:j2ee="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic-ejb-jar.xsd"> <weblogic-enterprise-bean> <ejb-name>OrquestratorBean</ejb-name> <jndi-name>OrquestratorBean</jndi-name> <dispatch-policy>ResponseTimeReqClass-0</dispatch-policy> </weblogic-enterprise-bean> </weblogic-ejb-jar> I've compiled this into a JAR and deployed it on WebLogic, as a library shared by administrative server and all cluster nodes on my solution (it's in "Active" state). As I've seen in several tutorials and examples, I'm using this code on my application, in order to call the bean: InitialContext ic = null; try { Hashtable<String,String> env = new Hashtable<String,String>(); env.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory"); env.put(Context.PROVIDER_URL, "t3://localhost:7001"); ic = new InitialContext(env); } catch(Exception e) { System.out.println("\n\t Didn't get InitialContext: "+e); } // try { Object obj = ic.lookup("OrquestratorBean"); OrquestratorRemote remote =(OrquestratorRemote)obj; System.out.println("\n\n\t++ Remote => "+ remote.getClass()); System.out.println("\n\n\t++ initOrquestrator()"); remote.initOrquestrator(); } catch(Exception e) { System.out.println("\n\n\t WorkManager Exception => "+ e); e.printStackTrace(); } Unfortunately, this don't work. It throws an exception on runtime, as follows: WorkManager Exception = javax.naming.NameNotFoundException: Unable to resolve 'OrquestratorBean'. Resolved '' [Root exception is javax.naming.NameNotFoundException: Unable to resolve 'OrquestratorBean'. Resolved '']; remaining name 'OrquestratorBean' After seeing this, I've even tried changing this line Object obj = ic.lookup("OrquestratorBean"); to this: Object obj = ic.lookup("OrquestratorBean#orquestrator.OrquestratorBean"); but the result was the same runtime exception. Can anyone please help me detecting what am I doing wrong here? I'm having a bad time debugging this, as I don't know how to check out what may be causing this issue... Thanks in advance for your patience and help.

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  • Can you help me get my head around openssl public key encryption with rsa.h in c++?

    - by Ben
    Hi there, I am trying to get my head around public key encryption using the openssl implementation of rsa in C++. Can you help? So far these are my thoughts (please do correct if necessary) Alice is connected to Bob over a network Alice and Bob want secure communications Alice generates a public / private key pair and sends public key to Bob Bob receives public key and encrypts a randomly generated symmetric cypher key (e.g. blowfish) with the public key and sends the result to Alice Alice decrypts the ciphertext with the originally generated private key and obtains the symmetric blowfish key Alice and Bob now both have knowledge of symmetric blowfish key and can establish a secure communication channel Now, I have looked at the openssl/rsa.h rsa implementation (since I already have practical experience with openssl/blowfish.h), and I see these two functions: int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); If Alice is to generate *rsa, how does this yield the rsa key pair? Is there something like rsa_public and rsa_private which are derived from rsa? Does *rsa contain both public and private key and the above function automatically strips out the necessary key depending on whether it requires the public or private part? Should two unique *rsa pointers be generated so that actually, we have the following: int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa_public, int padding); int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa_private, int padding); Secondly, in what format should the *rsa public key be sent to Bob? Must it be reinterpreted in to a character array and then sent the standard way? I've heard something about certificates -- are they anything to do with it? Sorry for all the questions, Best Wishes, Ben. EDIT: Coe I am currently employing: /* * theEncryptor.cpp * * * Created by ben on 14/01/2010. * Copyright 2010 __MyCompanyName__. All rights reserved. * */ #include "theEncryptor.h" #include <iostream> #include <sys/socket.h> #include <sstream> theEncryptor::theEncryptor() { } void theEncryptor::blowfish(unsigned char *data, int data_len, unsigned char* key, int enc) { // hash the key first! unsigned char obuf[20]; bzero(obuf,20); SHA1((const unsigned char*)key, 64, obuf); BF_KEY bfkey; int keySize = 16;//strlen((char*)key); BF_set_key(&bfkey, keySize, obuf); unsigned char ivec[16]; memset(ivec, 0, 16); unsigned char* out=(unsigned char*) malloc(data_len); bzero(out,data_len); int num = 0; BF_cfb64_encrypt(data, out, data_len, &bfkey, ivec, &num, enc); //for(int i = 0;i<data_len;i++)data[i]=out[i]; memcpy(data, out, data_len); free(out); } void theEncryptor::generateRSAKeyPair(int bits) { rsa = RSA_generate_key(bits, 65537, NULL, NULL); } int theEncryptor::publicEncrypt(unsigned char* data, unsigned char* dataEncrypted,int dataLen) { return RSA_public_encrypt(dataLen, data, dataEncrypted, rsa, RSA_PKCS1_OAEP_PADDING); } int theEncryptor::privateDecrypt(unsigned char* dataEncrypted, unsigned char* dataDecrypted) { return RSA_private_decrypt(RSA_size(rsa), dataEncrypted, dataDecrypted, rsa, RSA_PKCS1_OAEP_PADDING); } void theEncryptor::receivePublicKeyAndSetRSA(int sock, int bits) { int max_hex_size = (bits / 4) + 1; char keybufA[max_hex_size]; bzero(keybufA,max_hex_size); char keybufB[max_hex_size]; bzero(keybufB,max_hex_size); int n = recv(sock,keybufA,max_hex_size,0); n = send(sock,"OK",2,0); n = recv(sock,keybufB,max_hex_size,0); n = send(sock,"OK",2,0); rsa = RSA_new(); BN_hex2bn(&rsa->n, keybufA); BN_hex2bn(&rsa->e, keybufB); } void theEncryptor::transmitPublicKey(int sock, int bits) { const int max_hex_size = (bits / 4) + 1; long size = max_hex_size; char keyBufferA[size]; char keyBufferB[size]; bzero(keyBufferA,size); bzero(keyBufferB,size); sprintf(keyBufferA,"%s\r\n",BN_bn2hex(rsa->n)); sprintf(keyBufferB,"%s\r\n",BN_bn2hex(rsa->e)); int n = send(sock,keyBufferA,size,0); char recBuf[2]; n = recv(sock,recBuf,2,0); n = send(sock,keyBufferB,size,0); n = recv(sock,recBuf,2,0); } void theEncryptor::generateRandomBlowfishKey(unsigned char* key, int bytes) { /* srand( (unsigned)time( NULL ) ); std::ostringstream stm; for(int i = 0;i<bytes;i++){ int randomValue = 65 + rand()% 26; stm << (char)((int)randomValue); } std::string str(stm.str()); const char* strs = str.c_str(); for(int i = 0;bytes;i++)key[i]=strs[i]; */ int n = RAND_bytes(key, bytes); if(n==0)std::cout<<"Warning key was generated with bad entropy. You should not consider communication to be secure"<<std::endl; } theEncryptor::~theEncryptor(){}

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  • Is this fix to "PostSharp complains about CA1800:DoNotCastUnnecessarily" the best one?

    - by cad
    This question is about "is" and "as" in casting and about CA1800 PostSharp rule. I want to know if the solution I thought is the best one possible or if it have any problem that I can't see. I have this code (named OriginaL Code and reduced to the minimum relevant). The function ValidateSubscriptionLicenceProducts try to validate a SubscriptionLicence (that could be of 3 types: Standard,Credit and TimeLimited ) by casting it and checking later some stuff (in //Do Whatever). PostSharp complains about CA1800:DoNotCastUnnecessarily. The reason is that I am casting two times the same object to the same type. This code in best case will cast 2 times (if it is a StandardLicence) and in worst case 4 times (If it is a TimeLimited Licence). I know is possible to invalidate rule (it was my first approach), as there is no big impact in performance here, but I am trying a best approach. //Version Original Code //Min 2 casts, max 4 casts //PostSharp Complains about CA1800:DoNotCastUnnecessarily private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { if (licence is StandardSubscriptionLicence) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = ((StandardSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else if (licence is CreditSubscriptionLicence) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = ((CreditSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else if (licence is TimeLimitedSubscriptionLicence) { // All products must have a valid Time entitlement // All products must have a valid Credit entitlement & Credit interval List<TimeLimitedSubscriptionLicenceProduct> creditProducts = ((TimeLimitedSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } This is Improved1 version using "as". Do not complain about CA1800 but the problem is that it will cast always 3 times (if in the future we have 30 or 40 types of licences it could perform bad) //Version Improve 1 //Minimum 3 casts, maximum 3 casts private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { StandardSubscriptionLicence standardLicence = Slicence as StandardSubscriptionLicence; CreditSubscriptionLicence creditLicence = Clicence as CreditSubscriptionLicence; TimeLimitedSubscriptionLicence timeLicence = Tlicence as TimeLimitedSubscriptionLicence; if (Slicence == null) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = Slicence.SubscribedProducts; //Do whatever } else if (Clicence == null) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = Clicence.SubscribedProducts; //Do whatever } else if (Tlicence == null) { // All products must have a valid Time entitlement // All products must have a valid Credit entitlement & Credit interval List<TimeLimitedSubscriptionLicenceProduct> creditProducts = Tlicence.SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } But later I thought in a best one. This is the final version I am using. //Version Improve 2 // Min 1 cast, Max 3 Casts // Do not complain about CA1800:DoNotCastUnnecessarily private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { StandardSubscriptionLicence standardLicence = null; CreditSubscriptionLicence creditLicence = null; TimeLimitedSubscriptionLicence timeLicence = null; if (StandardSubscriptionLicence.TryParse(licence, out standardLicence)) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = standardLicence.SubscribedProducts; //Do whatever } else if (CreditSubscriptionLicence.TryParse(licence, out creditLicence)) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = creditLicence.SubscribedProducts; //Do whatever } else if (TimeLimitedSubscriptionLicence.TryParse(licence, out timeLicence)) { // All products must have a valid Time entitlement List<TimeLimitedSubscriptionLicenceProduct> timeProducts = timeLicence.SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } //Example of TryParse in CreditSubscriptionLicence public static bool TryParse(SubscriptionLicence baseLicence, out CreditSubscriptionLicence creditLicence) { creditLicence = baseLicence as CreditSubscriptionLicence; if (creditLicence != null) return true; else return false; } It requires a change in the classes StandardSubscriptionLicence, CreditSubscriptionLicence and TimeLimitedSubscriptionLicence to have a "tryparse" method (copied below in the code). This version I think it will cast as minimum only once and as maximum three. What do you think about improve 2? Is there a best way of doing it?

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  • What is the right tool to detect VMT or heap corruption in Delphi ?

    - by Roland Bengtsson
    I'm a member in a team that use Delphi 2007 for a larger application and we suspect heap corruption because sometimes there are strange bugs that have no other explanation. I believe that the Rangechecking option for the compiler is only for arrays. I want a tool that give an exception or log when there is a write on a memory address that is not allocated by the application. Regards EDIT: The error is of type: Error: Access violation at address 00404E78 in module 'BoatLogisticsAMCAttracsServer.exe'. Read of address FFFFFFDD EDIT2: Thanks for all suggestions. Unfortunately I think that the solution is deeper than that. We use a patched version of Bold for Delphi as we own the source. Probably there are some errors introduced in the Bold framwork. Yes we have a log with callstacks that are handled by JCL and also trace messages. So a callstack with the exception can lock like this: 20091210 16:02:29 (2356) [EXCEPTION] Raised EBold: Failed to derive ServerSession.mayDropSession: Boolean OCL expression: not active and not idle and timeout and (ApplicationKernel.allinstances->first.CurrentSession <> self) Error: Access violation at address 00404E78 in module 'BoatLogisticsAMCAttracsServer.exe'. Read of address FFFFFFDD. At Location BoldSystem.TBoldMember.CalculateDerivedMemberWithExpression (BoldSystem.pas:4016) Inner Exception Raised EBold: Failed to derive ServerSession.mayDropSession: Boolean OCL expression: not active and not idle and timeout and (ApplicationKernel.allinstances->first.CurrentSession <> self) Error: Access violation at address 00404E78 in module 'BoatLogisticsAMCAttracsServer.exe'. Read of address FFFFFFDD. At Location BoldSystem.TBoldMember.CalculateDerivedMemberWithExpression (BoldSystem.pas:4016) Inner Exception Call Stack: [00] System.TObject.InheritsFrom (sys\system.pas:9237) Call Stack: [00] BoldSystem.TBoldMember.CalculateDerivedMemberWithExpression (BoldSystem.pas:4016) [01] BoldSystem.TBoldMember.DeriveMember (BoldSystem.pas:3846) [02] BoldSystem.TBoldMemberDeriver.DoDeriveAndSubscribe (BoldSystem.pas:7491) [03] BoldDeriver.TBoldAbstractDeriver.DeriveAndSubscribe (BoldDeriver.pas:180) [04] BoldDeriver.TBoldAbstractDeriver.SetDeriverState (BoldDeriver.pas:262) [05] BoldDeriver.TBoldAbstractDeriver.Derive (BoldDeriver.pas:117) [06] BoldDeriver.TBoldAbstractDeriver.EnsureCurrent (BoldDeriver.pas:196) [07] BoldSystem.TBoldMember.EnsureContentsCurrent (BoldSystem.pas:4245) [08] BoldSystem.TBoldAttribute.EnsureNotNull (BoldSystem.pas:4813) [09] BoldAttributes.TBABoolean.GetAsBoolean (BoldAttributes.pas:3069) [10] BusinessClasses.TLogonSession._GetMayDropSession (code\BusinessClasses.pas:31854) [11] DMAttracsTimers.TAttracsTimerDataModule.RemoveDanglingLogonSessions (code\DMAttracsTimers.pas:237) [12] DMAttracsTimers.TAttracsTimerDataModule.UpdateServerTimeOnTimerTrig (code\DMAttracsTimers.pas:482) [13] DMAttracsTimers.TAttracsTimerDataModule.TimerKernelWork (code\DMAttracsTimers.pas:551) [14] DMAttracsTimers.TAttracsTimerDataModule.AttracsTimerTimer (code\DMAttracsTimers.pas:600) [15] ExtCtrls.TTimer.Timer (ExtCtrls.pas:2281) [16] Classes.StdWndProc (common\Classes.pas:11583) The inner exception part is the callstack at the moment an exception is reraised. EDIT3: The theory right now is that the Virtual Memory Table (VMT) is somehow broken. When this happen there is no indication of it. Only when a method is called an exception is raised (ALWAYS on address FFFFFFDD, -35 decimal) but then it is too late. You don't know the real cause for the error. Any hint of how to catch a bug like this is really appreciated!!! We have tried with SafeMM, but the problem is that the memory consumption is too high even when the 3 GB flag is used. So now I try to give a bounty to the SO community :) EDIT4: One hint is that according the log there is often (or even always) another exception before this. It can be for example optimistic locking in the database. We have tried to raise exceptions by force but in test environment it just works fine. EDIT5: Story continues... I did a search on the logs for the last 30 days now. The result: "Read of address FFFFFFDB" 0 "Read of address FFFFFFDC" 24 "Read of address FFFFFFDD" 270 "Read of address FFFFFFDE" 22 "Read of address FFFFFFDF" 7 "Read of address FFFFFFE0" 20 "Read of address FFFFFFE1" 0 So the current theory is that an enum (there is a lots in Bold) overwrite a pointer. I got 5 hits with different address above. It could mean that the enum holds 5 values where the second one is most used. If there is an exception a rollback should occur for the database and Boldobjects should be destroyed. Maybe there is a chance that not everything is destroyed and a enum still can write to an address location. If this is true maybe it is possible to search the code by a regexpr for an enum with 5 values ? EDIT6: To summarize, no there is no solution to the problem yet. I realize that I may mislead you a bit with the callstack. Yes there are a timer in that but there are other callstacks without a timer. Sorry for that. But there are 2 common factors. An exception with Read of address FFFFFFxx. Top of callstack is System.TObject.InheritsFrom (sys\system.pas:9237) This convince me that VilleK best describe the problem. I'm also convinced that the problem is somewhere in the Bold framework. But the BIG question is, how can problems like this be solved ? It is not enough to have an Assert like VilleK suggest as the damage has already happened and the callstack is gone at that moment. So to describe my view of what may cause the error: Somewhere a pointer is assigned a bad value 1, but it can be also 0, 2, 3 etc. An object is assigned to that pointer. There is method call in the objects baseclass. This cause method TObject.InheritsForm to be called and an exception appear on address FFFFFFDD. Those 3 events can be together in the code but they may also be used much later. I think this is true for the last method call. EDIT7: We work closely with the the author of Bold Jan Norden and he recently found a bug in the OCL-evaluator in Bold framework. When this was fixed these kinds of exceptions decreased a lot but they still occasionally come. But it is a big relief that this is almost solved.

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  • Ivy and Snapshots (Nexus)

    - by Uberpuppy
    Hey folks, I'm using ant, ivy and nexus repo manager to build and store my artifacts. I managed to get everything working: dependency resolution and publishing. Until I hit a problem... (of course!). I was publishing to a 'release' repo in nexus, which is locked to 'disable redeploy' (even if you change the setting to 'allow redeploy' (really lame UI there imo). You can imagine how pissed off I was getting when my changes weren't updating through the repo before I realised that this was happening. Anyway, I now have to switch everything to use a 'Snapshot' repo in nexus. Problem is that this messes up my publish. I've tried a variety of things, including extensive googling, and haven't got anywhere whatsoever. The error I get is a bad PUT request, error code 400. Can someone who has got this working please give me a pointer on what I'm missing. Many thanks, Alastair fyi, here's my config: Note that I have removed any attempts at getting snapshots to work as I didn't know what was actually (potentially) useful and what was complete guff. This is therefore the working release-only setup. Also, please note that I've added the XXX-API ivy.xml for info only. I can't even get the xxx-common to publish (and that doesn't even have dependencies). Ant task: <target name="publish" depends="init-publish"> <property name="project.generated.ivy.file" value="${project.artifact.dir}/ivy.xml"/> <property name="project.pom.file" value="${project.artifact.dir}/${project.handle}.pom"/> <echo message="Artifact dir: ${project.artifact.dir}"/> <ivy:deliver deliverpattern="${project.generated.ivy.file}" organisation="${project.organisation}" module="${project.artifact}" status="integration" revision="${project.revision}" pubrevision="${project.revision}" /> <ivy:resolve /> <ivy:makepom ivyfile="${project.generated.ivy.file}" pomfile="${project.pom.file}"/> <ivy:publish resolver="${ivy.omnicache.publisher}" module="${project.artifact}" organisation="${project.organisation}" revision="${project.revision}" pubrevision="${project.revision}" pubdate="now" overwrite="true" publishivy="true" status="integration" artifactspattern="${project.artifact.dir}/[artifact]-[revision](-[classifier]).[ext]" /> </target> Couple of ivy files to give an idea of internal dependencies: XXX-Common project: <ivy-module version="2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ant.apache.org/ivy/schemas/ivy.xsd"> <info organisation="com.myorg.xxx" module="xxx_common" status="integration" revision="1.0"> </info> <publications> <artifact name="xxx_common" type="jar" ext="jar"/> <artifact name="xxx_common" type="pom" ext="pom"/> </publications> <dependencies> </dependencies> </ivy-module> XXX-API project: <ivy-module version="2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ant.apache.org/ivy/schemas/ivy.xsd"> <info organisation="com.myorg.xxx" module="xxx_api" status="integration" revision="1.0"> </info> <publications> <artifact name="xxx_api" type="jar" ext="jar"/> <artifact name="xxx_api" type="pom" ext="pom"/> </publications> <dependencies> <dependency org="com.myorg.xxx" name="xxx_common" rev="1.0" transitive="true" /> </dependencies> </ivy-module> IVY Settings.xml: <ivysettings> <properties file="${ivy.project.dir}/project.properties" /> <settings defaultResolver="chain" defaultConflictManager="all" /> <credentials host="${ivy.credentials.host}" realm="Sonatype Nexus Repository Manager" username="${ivy.credentials.username}" passwd="${ivy.credentials.passwd}" /> <caches> <cache name="ivy.cache" basedir="${ivy.cache.dir}" /> </caches> <resolvers> <ibiblio name="xxx_publisher" m2compatible="true" root="${ivy.xxx.publish.url}" /> <chain name="chain"> <url name="xxx"> <ivy pattern="${ivy.xxx.repo.url}/com/myorg/xxx/[module]/[revision]/ivy-[revision].xml" /> <artifact pattern="${ivy.xxx.repo.url}/com/myorg/xxx/[module]/[revision]/[artifact]-[revision].[ext]" /> </url> <ibiblio name="xxx" m2compatible="true" root="${ivy.xxx.repo.url}"/> <ibiblio name="public" m2compatible="true" root="${ivy.master.repo.url}" /> <url name="com.springsource.repository.bundles.release"> <ivy pattern="http://repository.springsource.com/ivy/bundles/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" /> <artifact pattern="http://repository.springsource.com/ivy/bundles/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" /> </url> <url name="com.springsource.repository.bundles.external"> <ivy pattern="http://repository.springsource.com/ivy/bundles/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" /> <artifact pattern="http://repository.springsource.com/ivy/bundles/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" /> </url> </chain> </resolvers> </ivysettings>

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  • apache mod_rewrite rule in httpd.conf for modifying some paths, but not others

    - by wallyk
    I'm having quite a challenge creating an appropriate rewrite rule for Apache/2.2.14 on Fedora 10. I'm working through the CodeIgniter-Doctrine tutorial which uses an .htaccess file. (Search for Removing “index.php” from CodeIgniter urls about 10% down.) But since that's not recommended for a production server, I'm trying to tweak it to work in /etc/httpd/conf/httpd.conf. <VirtualHost *:80> ServerName ci_doctrine DocumentRoot /var/www/html/ci_doctrine ErrorLog /var/log/httpd/cid-error_log CustomLog /var/log/httpd/cid-access_log common <IfModule mod_rewrite.c> RewriteEngine on RewriteLog /var/log/httpd/cid_rewrite RewriteLogLevel 9 # RewriteCond ^/css/style.css$ (these have bad syntax, but that's beside the point) # RewriteRule ^/css/style.css$ /css/style.css [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php/$1 [L] </IfModule> <IfModule !mod_rewrite.c> ErrorDocument 404 /ci_doctrine/index.php </IfModule> </VirtualHost> It seems like the tutorial .htaccess rules properly test for existing files and then not alter the URL in such cases, but the rewrite log says that the conditions are true (that is, the file does not exist) even though it's there. 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) init rewrite engine with requested uri /login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (3) applying pattern '^(.*)$' to uri '/login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/login' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/login' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) rewrite '/login' -> '/index.php//login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) local path result: /index.php//login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (1) go-ahead with /var/www/html/ci_doctrine/index.php/login [OK] 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) init rewrite engine with requested uri /login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (3) applying pattern '^(.*)$' to uri '/login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/login' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/login' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) rewrite '/login' -> '/index.php//login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) local path result: /index.php//login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (1) go-ahead with /var/www/html/ci_doctrine/index.php/login [OK] 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) init rewrite engine with requested uri /css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (3) applying pattern '^(.*)$' to uri '/css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/css/style.css' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/css/style.css' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) rewrite '/css/style.css' -> '/index.php//css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) local path result: /index.php//css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (1) go-ahead with /var/www/html/ci_doctrine/index.php/css/style.css [OK] 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) init rewrite engine with requested uri /css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (3) applying pattern '^(.*)$' to uri '/css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/css/style.css' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/css/style.css' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) rewrite '/css/style.css' -> '/index.php//css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) local path result: /index.php//css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (1) go-ahead with /var/www/html/ci_doctrine/index.php/css/style.css [OK] The file .../css/style.css was working properly before I started messing around with the rewrite rules, so it should be in the right place. But now the path is always munged up by the rewriting, though the virtual components below index.php are properly translated. What am I doing wrong?

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  • migrating webclient to WCF; WCF client serializes parametername of method

    - by Wouter
    I'm struggling with migrating from webservice/webclient architecture to WCF architecture. The object are very complex, with lots of nested xsd's and different namespaces. Proxy classes are generated by adding a Web Reference to an original wsdl with 30+ webmethods and using xsd.exe for generating the missing SOAPFault objects. My pilot WCF Service consists of only 1 webmethod which matches the exact syntax of one of the original methods: 1 object as parameter, returning 1 other object as result value. I greated a WCF Interface using those proxy classes, using attributes: XMLSerializerFormat and ServiceContract on the interface, OperationContract on one method from original wsdl specifying Action, ReplyAction, all with the proper namespaces. I create incoming client messages using SoapUI; I generated a project from the original WSDL files (causing the SoapUI project to have 30+ methods) and created one new Request at the one implemented WebMethod, changed the url to my wcf webservice and send the message. Because of the specified (Reply-)Action in the OperationContractAttribute, the message is actually received and properly deserialized into an object. To get this far (40 hours of googling), a lot of frustration led me to using a custom endpoint in which the WCF 'wrapped tags' are removed, the namespaces for nested types are corrected, and the generated wsdl get's flattened (for better compatibility with other tools then MS VisualStudio). Interface code is this: [XmlSerializerFormat(Use = OperationFormatUse.Literal, Style = OperationFormatStyle.Document, SupportFaults = true)] [ServiceContract(Namespace = Constants.NamespaceStufZKN)] public interface IOntvangAsynchroon { [OperationContract(Action = Constants.NamespaceStufZKN + "/zakLk01", ReplyAction = Constants.NamespaceStufZKN + "/zakLk01", Name = "zakLk01")] [FaultContract(typeof(Fo03Bericht), Namespace = Constants.NamespaceStuf)] Bv03Bericht zakLk01([XmlElement("zakLk01", Namespace = Constants.NamespaceStufZKN)] ZAKLk01 zakLk011); When I use a Webclient in code to send a message, everything works. My problem is, when I use a WCF client. I use ChannelFactory< IOntvangAsynchroon to send a message. But the generated xml looks different: it includes the parametername of the method! It took me a lot of time to figure this one out, but here's what happens: Correct xml (stripped soap envelope): <soap:Body> <zakLk01 xmlns="http://www.egem.nl/StUF/sector/zkn/0310"> <stuurgegevens> <berichtcode xmlns="http://www.egem.nl/StUF/StUF0301">Bv01</berichtcode> <zender xmlns="http://www.egem.nl/StUF/StUF0301"> <applicatie>ONBEKEND</applicatie> </zender> </stuurgegevens> <parameters> </parameters> </zakLk01> </soap:Body> Bad xml: <soap:Body> <zakLk01 xmlns="http://www.egem.nl/StUF/sector/zkn/0310"> <zakLk011> <stuurgegevens> <berichtcode xmlns="http://www.egem.nl/StUF/StUF0301">Bv01</berichtcode> <zender xmlns="http://www.egem.nl/StUF/StUF0301"> <applicatie>ONBEKEND</applicatie> </zender> </stuurgegevens> <parameters> </parameters> </zakLk011> </zakLk01> </soap:Body> Notice the 'zakLk011' element? It is the name of the parameter of the method in my interface! So NOW it is zakLk011, but it when my parameter name was 'zakLk01', the xml seemed to contain some magical duplicate of the tag above, but without namespace. Of course, you can imagine me going crazy over what was happening before finding out it was the parametername! I know have actually created a WCF Service, at which I cannot send messages using a WCF Client anymore. For clarity: The method does get invoked using the WCF Client on my webservice, but the parameter object is empty. Because I'm using a custom endpoint to log the incoming xml, I can see the message is received fine, but just with the wrong syntax! WCF client code: ZAKLk01 stufbericht = MessageFactory.CreateZAKLk01(); ChannelFactory<IOntvangAsynchroon> factory = new ChannelFactory<IOntvangAsynchroon>(new BasicHttpBinding(), new EndpointAddress("http://localhost:8193/Roxit/Link/zkn0310")); factory.Endpoint.Behaviors.Add(new LinkEndpointBehavior()); IOntvangAsynchroon client = factory.CreateChannel(); client.zakLk01(stufbericht); I am not using a generated client, i just reference the webservice like i am lot's of times. Can anyone please help me? I can't google anything on this...

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  • Python hashable dicts

    - by TokenMacGuy
    As an exercise, and mostly for my own amusement, I'm implementing a backtracking packrat parser. The inspiration for this is i'd like to have a better idea about how hygenic macros would work in an algol-like language (as apposed to the syntax free lisp dialects you normally find them in). Because of this, different passes through the input might see different grammars, so cached parse results are invalid, unless I also store the current version of the grammar along with the cached parse results. (EDIT: a consequence of this use of key-value collections is that they should be immutable, but I don't intend to expose the interface to allow them to be changed, so either mutable or immutable collections are fine) The problem is that python dicts cannot appear as keys to other dicts. Even using a tuple (as I'd be doing anyways) doesn't help. >>> cache = {} >>> rule = {"foo":"bar"} >>> cache[(rule, "baz")] = "quux" Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unhashable type: 'dict' >>> I guess it has to be tuples all the way down. Now the python standard library provides approximately what i'd need, collections.namedtuple has a very different syntax, but can be used as a key. continuing from above session: >>> from collections import namedtuple >>> Rule = namedtuple("Rule",rule.keys()) >>> cache[(Rule(**rule), "baz")] = "quux" >>> cache {(Rule(foo='bar'), 'baz'): 'quux'} Ok. But I have to make a class for each possible combination of keys in the rule I would want to use, which isn't so bad, because each parse rule knows exactly what parameters it uses, so that class can be defined at the same time as the function that parses the rule. But combining the rules together is much more dynamic. In particular, I'd like a simple way to have rules override other rules, but collections.namedtuple has no analogue to dict.update(). Edit: An additional problem with namedtuples is that they are strictly positional. Two tuples that look like they should be different can in fact be the same: >>> you = namedtuple("foo",["bar","baz"]) >>> me = namedtuple("foo",["bar","quux"]) >>> you(bar=1,baz=2) == me(bar=1,quux=2) True >>> bob = namedtuple("foo",["baz","bar"]) >>> you(bar=1,baz=2) == bob(bar=1,baz=2) False tl'dr: How do I get dicts that can be used as keys to other dicts? Having hacked a bit on the answers, here's the more complete solution I'm using. Note that this does a bit extra work to make the resulting dicts vaguely immutable for practical purposes. Of course it's still quite easy to hack around it by calling dict.__setitem__(instance, key, value) but we're all adults here. class hashdict(dict): """ hashable dict implementation, suitable for use as a key into other dicts. >>> h1 = hashdict({"apples": 1, "bananas":2}) >>> h2 = hashdict({"bananas": 3, "mangoes": 5}) >>> h1+h2 hashdict(apples=1, bananas=3, mangoes=5) >>> d1 = {} >>> d1[h1] = "salad" >>> d1[h1] 'salad' >>> d1[h2] Traceback (most recent call last): ... KeyError: hashdict(bananas=3, mangoes=5) based on answers from http://stackoverflow.com/questions/1151658/python-hashable-dicts """ def __key(self): return tuple(sorted(self.items())) def __repr__(self): return "{0}({1})".format(self.__class__.__name__, ", ".join("{0}={1}".format( str(i[0]),repr(i[1])) for i in self.__key())) def __hash__(self): return hash(self.__key()) def __setitem__(self, key, value): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def __delitem__(self, key): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def clear(self): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def pop(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def popitem(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def setdefault(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def update(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def __add__(self, right): result = hashdict(self) dict.update(result, right) return result if __name__ == "__main__": import doctest doctest.testmod()

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  • jQuery show hide divs on radio buttons

    - by RyanP13
    I have got a group of radio buttons that when clicked need to display a corresponding unordered list. I have got as far as showing the correct list according to which radio button is clicked but cannot figure out how to hide the other lists that need to be hidden. So if i click the second benefits radion then the second 'spend' ul will display and the other 'spend' uls will hide. This is my jQuery: // hide all except first ul $('div.chevron ul').not(':first').hide(); // $('div.chevron > ul > li > input[name=benefits]').live('click',function() { // work out which radio has been clicked var $radioClick = $(this).index('div.chevron > ul > li > input[name=benefits]'); var $radioClick = $radioClick + 1; $('div.chevron > ul').eq($radioClick).show(); }); // trigger click event to show spend list var $defaultRadio = $('div.chevron > ul > li > input:first[name=benefits]') $defaultRadio.trigger('click'); And this is my HTML: <div class="divider chevron"> <ul> <li><strong>What benefit are you most interested in?</strong></li> <li> <input type="radio" class="inlineSpace" name="benefits" id="firstBenefit" value="Dental" checked="checked" /> <label for="firstBenefit">Dental</label> </li> <li> <input type="radio" class="inlineSpace" name="benefits" id="secondBenefit" value="Optical" /> <label for="secondBenefit">Optical</label> </li> <li> <input type="radio" class="inlineSpace" name="benefits" id="thirdBenefit" value="Physiotherapy" /> <label for="thirdBenefit">Physiotherapy, osteopathy, chiropractic, acupuncture</label> </li> </ul> <ul> <li><strong>How much do you spend a year on Dental?</strong></li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate1a" value="£50" /> <label for="rate1a">&pound;50</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate2a" value="£100" /> <label for="rate2a">&pound;100</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate3a" value="£150" /> <label for="rate3a">&pound;150</label> </li> </ul> <ul> <li><strong>How much do you spend a year on Optical?</strong></li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate1b" value="£50" /> <label for="rate1a">&pound;50</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate2b" value="£100" /> <label for="rate2a">&pound;100</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate3b" value="£150" /> <label for="rate3a">&pound;150</label> </li> </ul> <ul> <li><strong>How much do you spend a year on Physiotherapy, osteopathy, chiropractic, acupuncture?</strong></li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate1c" value="£50" /> <label for="rate1a">&pound;50</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate2c" value="£100" /> <label for="rate2a">&pound;100</label> </li> <li> <input type="radio" class="inlineSpace" name="spend" id="rate3c" value="£150" /> <label for="rate3a">&pound;150</label> </li> </ul> <label class="button"><input type="submit" value="View your quote" class="submit" /></label> </div> I tried using: $('div.chevron > ul').not($radioClick).hide(); But that yielded a bad result where all the lists where hidden. Thanks in advance.

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  • Build Environment setup - Using .net, java, hudson, and ruby - Could really use a critique

    - by Jeff D
    I'm trying to figure out the best way to stitch together a fast, repeatable, unbreakable build process for the following environment. I've got a plan for how to do it, but I'd really appreciate a critique. (I'd also appreciate some sample code, but more on that later) Ecosystem - Logical: Website - asp.net MVC 2, .net 3.5, Visual Studio 2010. IIS 6, Facebook iframe application application. This website/facebook app uses a few services. An internal search api, an internal read/write api, facebook, and an IP geolocation service. More details on these below Internal search api - .net, restful, built using old school .ashx handlers. The api uses lucene, and a sql server database behind the scenes. My project won't touch the lucene code, but does potentially touch the database and the web services. internal read/write api - java, restful, running on Tomcat Facebook web services A mocking site that emulates the internal read/write api, and parts of the facebook api Hudson - Runs unit tests on checkin, and creates some installers that behave inconsistently. Ecosystem - Physical: All of these machines can talk to one another, except for Hudson. Hudson can't see any of the target machines. So code must be pulled, rather than pushed. (Security thing) 1. Web Server - Holds the website, and the read/write api. (The api itself writes to a replicated sql server environment). 2. Search Server - Houses the search api. 3. Hudson Server - Does not have permissions to push to any environment. They have to pull. 4. Lucene Server 5. Database Server Problem I've been trying to set this site up to run in a stress environment, but the number of setup steps, the amount of time it takes to update a component, the black-box nature of the current installers, and the time it takes to generate data into the test system is absolutely destroying my productivity. I tweak one setting, have to redeploy, restart in a certain order, resetup some of the settings, and rebuild test data. Errors result in headscratching, and then basically starting over. Very bad. This problem is complicated further by my stress testing. I need to be able to turn on and off different external components, so that I can effectively determine the scalability of each piece. I've got strategies in place for how to do that for each dependency, but it further complicates my setup strategy, because now each component has 2 options. A mock version, or a real version. Configurations everywhere must be updated accordingly. Goals Fast - I want to drop this from a 20 minute exercise when things go perfectly, to a 3 minute one Stupid simple - I want to tell the environment what to do with as few commands as possible, and not have to remember how to stitch the environments together Repeatable - I want the script to be idempotent. Kind of a corollary to the Stupid Simple thing. The Plan So Far Here's what I've come up with so far, and what I've come looking for feedback on: Use VisualStudio's new web.config transformations to permit easily altering configs based on envrionment. This solution isn't really sufficient though. I will leave web.config set up to let the site run locally, but when deploying elsewhere, I have as many as 6 different possible outputs for the stress environment alone (because of the mocks of the various dependencies), let alone the settings for prod, QA, and dev. Each of these would then require it's own setup, or a setup that would then post-process the configs. So I'm currently leaning toward just having the dev version, and a version that converts key configuration values into a ruby string interpolation syntax. ({#VAR_NAME} kinda thing) Create a ruby script for each server that is essentially a bootstrapping script. That is to say, it will do nothing but load the ruby code that does the 'real' work from hudson/subversion, so that the script's functionality can evolve with the application, making it easy to build the site at any point in time by reference the appropriate version of the script. So in a nutshell, this script loads another script, and runs it. The 'real' ruby script will then accept commandline parameters that describe how the environment should look. From there, 1 configuration file can be used, and ruby will download the current installers, run them, post-process the configs, restart IIS/Tomcat, and kick off any data setup code that is needed. So that's it. I'm in a real time crunch to get this site stress-tested, so any feedback that you think could abbreviate the time this might take would be appreciated. That includes a shameless request for sample ruby code. I've not gotten too much further than puts "Hello World". :-) Just guidance would be helpful. Is this something that Rake would be useful for? How would you recommend I write tests for this animal? (I use interfaces and automocking frameworks to mock out things like http requests in .net. With ducktyping, it seems that this might be easier, but I don't know how to tell my code to use a fake duck in test, but a real one in practice) Thanks all. Sorry for such such a long-winded, open-ended question.

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  • Node.js vs PHP processing speed

    - by Cody Craven
    I've been looking into node.js recently and wanted to see a true comparison of processing speed for PHP vs Node.js. In most of the comparisons I had seen, Node trounced Apache/PHP set ups handily. However all of the tests were small 'hello worlds' that would not accurately reflect any webpage's markup. So I decided to create a basic HTML page with 10,000 hello world paragraph elements. In these tests Node with Cluster was beaten to a pulp by PHP on Nginx utilizing PHP-FPM. So I'm curious if I am misusing Node somehow or if Node is really just this bad at processing power. Note that my results were equivalent outputting "Hello world\n" with text/plain as the HTML, but I only included the HTML as it's closer to the use case I was investigating. My testing box: Core i7-2600 Intel CPU (has 8 threads with 4 cores) 8GB DDR3 RAM Fedora 16 64bit Node.js v0.6.13 Nginx v1.0.13 PHP v5.3.10 (with PHP-FPM) My test scripts: Node.js script var cluster = require('cluster'); var http = require('http'); var numCPUs = require('os').cpus().length; if (cluster.isMaster) { // Fork workers. for (var i = 0; i < numCPUs; i++) { cluster.fork(); } cluster.on('death', function (worker) { console.log('worker ' + worker.pid + ' died'); }); } else { // Worker processes have an HTTP server. http.Server(function (req, res) { res.writeHead(200, {'Content-Type': 'text/html'}); res.write('<html>\n<head>\n<title>Speed test</title>\n</head>\n<body>\n'); for (var i = 0; i < 10000; i++) { res.write('<p>Hello world</p>\n'); } res.end('</body>\n</html>'); }).listen(80); } This script is adapted from Node.js' documentation at http://nodejs.org/docs/latest/api/cluster.html PHP script <?php echo "<html>\n<head>\n<title>Speed test</title>\n</head>\n<body>\n"; for ($i = 0; $i < 10000; $i++) { echo "<p>Hello world</p>\n"; } echo "</body>\n</html>"; My results Node.js $ ab -n 500 -c 20 http://speedtest.dev/ This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking speedtest.dev (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Finished 500 requests Server Software: Server Hostname: speedtest.dev Server Port: 80 Document Path: / Document Length: 190070 bytes Concurrency Level: 20 Time taken for tests: 14.603 seconds Complete requests: 500 Failed requests: 0 Write errors: 0 Total transferred: 95066500 bytes HTML transferred: 95035000 bytes Requests per second: 34.24 [#/sec] (mean) Time per request: 584.123 [ms] (mean) Time per request: 29.206 [ms] (mean, across all concurrent requests) Transfer rate: 6357.45 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.2 0 2 Processing: 94 547 405.4 424 2516 Waiting: 0 331 399.3 216 2284 Total: 95 547 405.4 424 2516 Percentage of the requests served within a certain time (ms) 50% 424 66% 607 75% 733 80% 813 90% 1084 95% 1325 98% 1843 99% 2062 100% 2516 (longest request) PHP/Nginx $ ab -n 500 -c 20 http://speedtest.dev/test.php This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking speedtest.dev (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Finished 500 requests Server Software: nginx/1.0.13 Server Hostname: speedtest.dev Server Port: 80 Document Path: /test.php Document Length: 190070 bytes Concurrency Level: 20 Time taken for tests: 0.130 seconds Complete requests: 500 Failed requests: 0 Write errors: 0 Total transferred: 95109000 bytes HTML transferred: 95035000 bytes Requests per second: 3849.11 [#/sec] (mean) Time per request: 5.196 [ms] (mean) Time per request: 0.260 [ms] (mean, across all concurrent requests) Transfer rate: 715010.65 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.2 0 1 Processing: 3 5 0.7 5 7 Waiting: 1 4 0.7 4 7 Total: 3 5 0.7 5 7 Percentage of the requests served within a certain time (ms) 50% 5 66% 5 75% 5 80% 6 90% 6 95% 6 98% 6 99% 6 100% 7 (longest request) Additional details Again what I'm looking for is to find out if I'm doing something wrong with Node.js or if it is really just that slow compared to PHP on Nginx with FPM. I certainly think Node has a real niche that it could fit well, however with these test results (which I really hope I made a mistake with - as I like the idea of Node) lead me to believe that it is a horrible choice for even a modest processing load when compared to PHP (let alone JVM or various other fast solutions). As a final note, I also tried running an Apache Bench test against node with $ ab -n 20 -c 20 http://speedtest.dev/ and consistently received a total test time of greater than 0.900 seconds.

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  • Am I crazy? (How) should I create a jQuery content editor?

    - by Brendon Muir
    Ok, so I created a CMS mainly aimed at Primary Schools. It's getting fairly popular in New Zealand but the one thing I hate with a passion is the largely bad quality of in browser WYSIWYG editors. I've been using KTML (made by InterAKT which was purchased by Adobe a few years ago). In my opinion this editor does a lot of great things (image editing/management, thumbnailing and pretty good content editing). Unfortunately time has had its nasty way with this product and new browsers are beginning to break features and generally degrade the performance of this tool. It's also quite scary basing my livelihood on a defunct product! I've been hunting, in fact I regularly hunt around to see if anything has changed in the WYSIWYG arena. The closest thing I've seen that excites me is the WYSIHAT framework, but they've decided to ignore a pretty relevant editing paradigm which I'm going to outline below. This is the idea for my proposed editor, and I don't know of any existing products that can do this properly: Right, so the traditional model for editing let's say a Page in a CMS is to log into a 'back end' and click edit on the page. This will then load another screen with the editor in it and perhaps a few other fields. More advanced CMS's will maybe have several editing boxes that are for different portions of the page. Anyway, the big problem with this way of doing things is that the user is editing a document outside of the final context it will appear in. In the simplest terms, this means the page template. Many things can be wrong, e.g. the with of the editing area might be different to the width of the actual template area. The height is nearly always fixed because existing editors always seem to use IFRAMES for backward compatibility. And there are plenty of other beefs which I'm sure you're quite aware of if you're in this development area. Here's my editor utopia: You click 'Edit Page': The actual page (with its actual template) displays. Portions of the page have been marked as editable via a class name. You click on one of these areas (in my case it'd just be the big 'body' area in the middle of the template) and a editing bar drops down from the top of the screen with all your standard controls (bold, italic, insert image etc...). Iframes are never used, instead we rely on setting contentEditable to true on the DIV's in question. Firefox 2 and IE6 can go away, let's move on. You can edit the page knowing exactly how it will look when you save it. Because all the styles for this template are loaded, your headings will look correct, everything will be just dandy. Is this such a radical concept? Why are we still content with TinyMCE and that other editor that is too embarrassing to use because it sounds like a swear word!? Let's face the facts: I'm a JavaScript novice. I did once play around in this area using the Javascript Anthology from SitePoint as a guide. It was quite a cool learning experience, but they of course used the IFRAME to make their lives easier. I tried to go a different route and just use contentEditable and even tried to sidestep the native content editing routines (execCommand) and instead wrote my own. They kind of worked but there were always issues. Now we have jQuery, and a few libraries that abstract things like IE's lack of Range support. I'm wondering, am I crazy, or is it actually a good idea to try and build an editor around this editing paradigm using jQuery and relevant plugins to make the job easier? My actual questions: Where would you start? What plugins do you know of that would help the most? Is it worth it, or is there a magical project that already exists that I should join in on? What are the biggest hurdles to overcome in a project like this? Am I crazy? I hope this question has been posted on the right board. I figured it is a technical question as I'm wanting to know specific hurdles and pitfalls to watch out for and also if it is technically feasible with todays technology. Looking forward to hearing peoples thoughts and opinions.

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  • Threading extra state through a parser in Scala

    - by Travis Brown
    I'll give you the tl;dr up front I'm trying to use the state monad transformer in Scalaz 7 to thread extra state through a parser, and I'm having trouble doing anything useful without writing a lot of t m a -> t m b versions of m a -> m b methods. An example parsing problem Suppose I have a string containing nested parentheses with digits inside them: val input = "((617)((0)(32)))" I also have a stream of fresh variable names (characters, in this case): val names = Stream('a' to 'z': _*) I want to pull a name off the top of the stream and assign it to each parenthetical expression as I parse it, and then map that name to a string representing the contents of the parentheses, with the nested parenthetical expressions (if any) replaced by their names. To make this more concrete, here's what I'd want the output to look like for the example input above: val target = Map( 'a' -> "617", 'b' -> "0", 'c' -> "32", 'd' -> "bc", 'e' -> "ad" ) There may be either a string of digits or arbitrarily many sub-expressions at a given level, but these two kinds of content won't be mixed in a single parenthetical expression. To keep things simple, we'll assume that the stream of names will never contain either duplicates or digits, and that it will always contain enough names for our input. Using parser combinators with a bit of mutable state The example above is a slightly simplified version of the parsing problem in this Stack Overflow question. I answered that question with a solution that looked roughly like this: import scala.util.parsing.combinator._ class ParenParser(names: Iterator[Char]) extends RegexParsers { def paren: Parser[List[(Char, String)]] = "(" ~> contents <~ ")" ^^ { case (s, m) => (names.next -> s) :: m } def contents: Parser[(String, List[(Char, String)])] = "\\d+".r ^^ (_ -> Nil) | rep1(paren) ^^ ( ps => ps.map(_.head._1).mkString -> ps.flatten ) def parse(s: String) = parseAll(paren, s).map(_.toMap) } It's not too bad, but I'd prefer to avoid the mutable state. What I want Haskell's Parsec library makes adding user state to a parser trivially easy: import Control.Applicative ((*>), (<$>), (<*)) import Data.Map (fromList) import Text.Parsec paren = do (s, m) <- char '(' *> contents <* char ')' h : t <- getState putState t return $ (h, s) : m where contents = flip (,) [] <$> many1 digit <|> (\ps -> (map (fst . head) ps, concat ps)) <$> many1 paren main = print $ runParser (fromList <$> paren) ['a'..'z'] "example" "((617)((0)(32)))" This is a fairly straightforward translation of my Scala parser above, but without mutable state. What I've tried I'm trying to get as close to the Parsec solution as I can using Scalaz's state monad transformer, so instead of Parser[A] I'm working with StateT[Parser, Stream[Char], A]. I have a "solution" that allows me to write the following: import scala.util.parsing.combinator._ import scalaz._, Scalaz._ object ParenParser extends ExtraStateParsers[Stream[Char]] with RegexParsers { protected implicit def monadInstance = parserMonad(this) def paren: ESP[List[(Char, String)]] = (lift("(" ) ~> contents <~ lift(")")).flatMap { case (s, m) => get.flatMap( names => put(names.tail).map(_ => (names.head -> s) :: m) ) } def contents: ESP[(String, List[(Char, String)])] = lift("\\d+".r ^^ (_ -> Nil)) | rep1(paren).map( ps => ps.map(_.head._1).mkString -> ps.flatten ) def parse(s: String, names: Stream[Char]) = parseAll(paren.eval(names), s).map(_.toMap) } This works, and it's not that much less concise than either the mutable state version or the Parsec version. But my ExtraStateParsers is ugly as sin—I don't want to try your patience more than I already have, so I won't include it here (although here's a link, if you really want it). I've had to write new versions of every Parser and Parsers method I use above for my ExtraStateParsers and ESP types (rep1, ~>, <~, and |, in case you're counting). If I had needed to use other combinators, I'd have had to write new state transformer-level versions of them as well. Is there a cleaner way to do this? I'd love to see an example of a Scalaz 7's state monad transformer being used to thread state through a parser, but Scala 6 or Haskell examples would also be useful.

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  • Approaches for generic, compile-time safe lazy-load methods

    - by Aaronaught
    Suppose I have created a wrapper class like the following: public class Foo : IFoo { private readonly IFoo innerFoo; public Foo(IFoo innerFoo) { this.innerFoo = innerFoo; } public int? Bar { get; set; } public int? Baz { get; set; } } The idea here is that the innerFoo might wrap data-access methods or something similarly expensive, and I only want its GetBar and GetBaz methods to be invoked once. So I want to create another wrapper around it, which will save the values obtained on the first run. It's simple enough to do this, of course: int IFoo.GetBar() { if ((Bar == null) && (innerFoo != null)) Bar = innerFoo.GetBar(); return Bar ?? 0; } int IFoo.GetBaz() { if ((Baz == null) && (innerFoo != null)) Baz = innerFoo.GetBaz(); return Baz ?? 0; } But it gets pretty repetitive if I'm doing this with 10 different properties and 30 different wrappers. So I figured, hey, let's make this generic: T LazyLoad<T>(ref T prop, Func<IFoo, T> loader) { if ((prop == null) && (innerFoo != null)) prop = loader(innerFoo); return prop; } Which almost gets me where I want, but not quite, because you can't ref an auto-property (or any property at all). In other words, I can't write this: int IFoo.GetBar() { return LazyLoad(ref Bar, f => f.GetBar()); // <--- Won't compile } Instead, I'd have to change Bar to have an explicit backing field and write explicit getters and setters. Which is fine, except for the fact that I end up writing even more redundant code than I was writing in the first place. Then I considered the possibility of using expression trees: T LazyLoad<T>(Expression<Func<T>> propExpr, Func<IFoo, T> loader) { var memberExpression = propExpr.Body as MemberExpression; if (memberExpression != null) { // Use Reflection to inspect/set the property } } This plays nice with refactoring - it'll work great if I do this: return LazyLoad(f => f.Bar, f => f.GetBar()); But it's not actually safe, because someone less clever (i.e. myself in 3 days from now when I inevitably forget how this is implemented internally) could decide to write this instead: return LazyLoad(f => 3, f => f.GetBar()); Which is either going to crash or result in unexpected/undefined behaviour, depending on how defensively I write the LazyLoad method. So I don't really like this approach either, because it leads to the possibility of runtime errors which would have been prevented in the first attempt. It also relies on Reflection, which feels a little dirty here, even though this code is admittedly not performance-sensitive. Now I could also decide to go all-out and use DynamicProxy to do method interception and not have to write any code, and in fact I already do this in some applications. But this code is residing in a core library which many other assemblies depend on, and it seems horribly wrong to be introducing this kind of complexity at such a low level. Separating the interceptor-based implementation from the IFoo interface by putting it into its own assembly doesn't really help; the fact is that this very class is still going to be used all over the place, must be used, so this isn't one of those problems that could be trivially solved with a little DI magic. The last option I've already thought of would be to have a method like: T LazyLoad<T>(Func<T> getter, Action<T> setter, Func<IFoo, T> loader) { ... } This option is very "meh" as well - it avoids Reflection but is still error-prone, and it doesn't really reduce the repetition that much. It's almost as bad as having to write explicit getters and setters for each property. Maybe I'm just being incredibly nit-picky, but this application is still in its early stages, and it's going to grow substantially over time, and I really want to keep the code squeaky-clean. Bottom line: I'm at an impasse, looking for other ideas. Question: Is there any way to clean up the lazy-loading code at the top, such that the implementation will: Guarantee compile-time safety, like the ref version; Actually reduce the amount of code repetition, like the Expression version; and Not take on any significant additional dependencies? In other words, is there a way to do this just using regular C# language features and possibly a few small helper classes? Or am I just going to have to accept that there's a trade-off here and strike one of the above requirements from the list?

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  • JPanel Layout Image Cutoff

    - by Trizicus
    I am adding images to a JPanel but the images are getting cut off. I was originally trying BorderLayout but that only worked for one image and adding others added image cut-off. So I switched to other layouts and the best and closest I could get was BoxLayout however that adds a very large cut-off which is not acceptable either. So basically; How can I add images (from a custom JComponent) to a custom JPanel without bad effects such as the one present in the code. Custom JPanel: import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.BoxLayout; import javax.swing.JPanel; import javax.swing.Timer; public class GraphicsPanel extends JPanel implements MouseListener { private Entity test; private Timer timer; private long startTime = 0; private int numFrames = 0; private float fps = 0.0f; GraphicsPanel() { test = new Entity("test.png"); Thread t1 = new Thread(test); t1.start(); Entity ent2 = new Entity("images.jpg"); ent2.setX(150); ent2.setY(150); Thread t2 = new Thread(ent2); t2.start(); Entity ent3 = new Entity("test.png"); ent3.setX(0); ent3.setY(150); Thread t3 = new Thread(ent3); t3.start(); //ESSENTIAL setLayout(new BoxLayout(this, BoxLayout.X_AXIS)); add(test); add(ent2); add(ent3); //GAMELOOP timer = new Timer(30, new Gameloop(this)); timer.start(); addMouseListener(this); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g.create(); g2.setClip(0, 0, getWidth(), getHeight()); g2.setColor(Color.BLACK); g2.drawString("FPS: " + fps, 1, 15); } public void getFPS() { ++numFrames; if (startTime == 0) { startTime = System.currentTimeMillis(); } else { long currentTime = System.currentTimeMillis(); long delta = (currentTime - startTime); if (delta > 1000) { fps = (numFrames * 1000) / delta; numFrames = 0; startTime = currentTime; } } } public void mouseClicked(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } class Gameloop implements ActionListener { private GraphicsPanel gp; Gameloop(GraphicsPanel gp) { this.gp = gp; } public void actionPerformed(ActionEvent e) { try { gp.getFPS(); gp.repaint(); } catch (Exception ez) { } } } } Main class: import java.awt.EventQueue; import javax.swing.JFrame; public class MainWindow { public static void main(String[] args) { new MainWindow(); } private JFrame frame; private GraphicsPanel gp = new GraphicsPanel(); MainWindow() { EventQueue.invokeLater(new Runnable() { public void run() { frame = new JFrame("Graphics Practice"); frame.setSize(680, 420); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(gp); } }); } } Custom JComponent import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import javax.swing.JComponent; public class Entity extends JComponent implements Runnable { private BufferedImage bImg; private int x = 0; private int y = 0; private int entityWidth, entityHeight; private String filename; Entity(String filename) { this.filename = filename; } public void run() { bImg = loadBImage(filename); entityWidth = bImg.getWidth(); entityHeight = bImg.getHeight(); setPreferredSize(new Dimension(entityWidth, entityHeight)); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); g2d.drawImage(bImg, x, y, null); g2d.dispose(); } public BufferedImage loadBImage(String filename) { try { bImg = ImageIO.read(getClass().getResource(filename)); } catch (Exception e) { } return bImg; } public int getEntityWidth() { return entityWidth; } public int getEntityHeight() { return entityHeight; } public int getX() { return x; } public int getY() { return y; } public void setX(int x) { this.x = x; } public void setY(int y) { this.y = y; } }

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  • Mutating the expression tree of a predicate to target another type

    - by Jon
    Intro In the application I 'm currently working on, there are two kinds of each business object: the "ActiveRecord" type, and the "DataContract" type. So for example, we have: namespace ActiveRecord { class Widget { public int Id { get; set; } } } namespace DataContracts { class Widget { public int Id { get; set; } } } The database access layer takes care of "translating" between hierarchies: you can tell it to update a DataContracts.Widget, and it will magically create an ActiveRecord.Widget with the same property values and save that. The problem I have surfaced when attempting to refactor this database access layer. The Problem I want to add methods like the following to the database access layer: // Widget is DataContract.Widget interface DbAccessLayer { IEnumerable<Widget> GetMany(Expression<Func<Widget, bool>> predicate); } The above is a simple general-use "get" method with custom predicate. The only point of interest is that I 'm not passing in an anonymous function but rather an expression tree. This is done because inside DbAccessLayer we have to query ActiveRecord.Widget efficiently (LINQ to SQL) and not have the database return all ActiveRecord.Widget instances and then filter the enumerable collection. We need to pass in an expression tree, so we ask for one as the parameter for GetMany. The snag: the parameter we have needs to be magically transformed from an Expression<Func<DataContract.Widget, bool>> to an Expression<Func<ActiveRecord.Widget, bool>>. This is where I haven't managed to pull it off... Attempted Solution What we 'd like to do inside GetMany is: IEnumerable<DataContract.Widget> GetMany( Expression<Func<DataContract.Widget, bool>> predicate) { var lambda = Expression.Lambda<Func<ActiveRecord.Widget, bool>>( predicate.Body, predicate.Parameters); // use lambda to query ActiveRecord.Widget and return some value } This won't work because in a typical scenario, for example if: predicate == w => w.Id == 0; ...the expression tree contains a MemberAccessExpression instance which has a MemberInfo property (named Member) that point to members of DataContract.Widget. There are also ParameterExpression instances both in the expression tree and in its parameter expression collection (predicate.Parameters); After searching a bit, I found System.Linq.Expressions.ExpressionVisitor (its source can be found here in the context of a how-to, very helpful) which is a convenient way to modify an expression tree. Armed with this, I implemented a visitor. This simple visitor only takes care of changing the types in member access and parameter expressions. It may not be complete, but it's fine for the expression w => w.Id == 0. internal class Visitor : ExpressionVisitor { private readonly Func<Type, Type> dataContractToActiveRecordTypeConverter; public Visitor(Func<Type, Type> dataContractToActiveRecordTypeConverter) { this.dataContractToActiveRecordTypeConverter = dataContractToActiveRecordTypeConverter; } protected override Expression VisitMember(MemberExpression node) { var dataContractType = node.Member.ReflectedType; var activeRecordType = this.dataContractToActiveRecordTypeConverter(dataContractType); var converted = Expression.MakeMemberAccess( base.Visit(node.Expression), activeRecordType.GetProperty(node.Member.Name)); return converted; } protected override Expression VisitParameter(ParameterExpression node) { var dataContractType = node.Type; var activeRecordType = this.dataContractToActiveRecordTypeConverter(dataContractType); return Expression.Parameter(activeRecordType, node.Name); } } With this visitor, GetMany becomes: IEnumerable<DataContract.Widget> GetMany( Expression<Func<DataContract.Widget, bool>> predicate) { var visitor = new Visitor(...); var lambda = Expression.Lambda<Func<ActiveRecord.Widget, bool>>( visitor.Visit(predicate.Body), predicate.Parameters.Select(p => visitor.Visit(p)); var widgets = ActiveRecord.Widget.Repository().Where(lambda); // This is just for reference, see below Expression<Func<ActiveRecord.Widget, bool>> referenceLambda = w => w.Id == 0; // Here we 'd convert the widgets to instances of DataContract.Widget and // return them -- this has nothing to do with the question though. } Results The good news is that lambda is constructed just fine. The bad news is that it isn't working; it's blowing up on me when I try to use it (the exception messages are really not helpful at all). I have examined the lambda my code produces and a hardcoded lambda with the same expression; they look exactly the same. I spent hours in the debugger trying to find some difference, but I can't. When predicate is w => w.Id == 0, lambda looks exactly like referenceLambda. But the latter works with e.g. IQueryable<T>.Where, while the former does not (I have tried this in the immediate window of the debugger). I should also mention that when predicate is w => true, it all works just fine. Therefore I am assuming that I 'm not doing enough work in Visitor, but I can't find any more leads to follow on. Can someone point me in the right direction? Thanks in advance for your help!

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  • Modelling boost::Lockable with semaphore rather than mutex (previously titled: Unlocking a mutex fr

    - by dan
    I'm using the C++ boost::thread library, which in my case means I'm using pthreads. Officially, a mutex must be unlocked from the same thread which locks it, and I want the effect of being able to lock in one thread and then unlock in another. There are many ways to accomplish this. One possibility would be to write a new mutex class which allows this behavior. For example: class inter_thread_mutex{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique_lock<boost::mutex> lck(mx); while(locked) cv.wait(lck); locked=true; } void unlock(){ { boost::lock_guard<boost::mutex> lck(mx); if(!locked) error(); locked=false; } cv.notify_one(); } // bool try_lock(); void error(); etc. } I should point out that the above code doesn't guarantee FIFO access, since if one thread calls lock() while another calls unlock(), this first thread may acquire the lock ahead of other threads which are waiting. (Come to think of it, the boost::thread documentation doesn't appear to make any explicit scheduling guarantees for either mutexes or condition variables). But let's just ignore that (and any other bugs) for now. My question is, if I decide to go this route, would I be able to use such a mutex as a model for the boost Lockable concept. For example, would anything go wrong if I use a boost::unique_lock< inter_thread_mutex for RAII-style access, and then pass this lock to boost::condition_variable_any.wait(), etc. On one hand I don't see why not. On the other hand, "I don't see why not" is usually a very bad way of determining whether something will work. The reason I ask is that if it turns out that I have to write wrapper classes for RAII locks and condition variables and whatever else, then I'd rather just find some other way to achieve the same effect. EDIT: The kind of behavior I want is basically as follows. I have an object, and it needs to be locked whenever it is modified. I want to lock the object from one thread, and do some work on it. Then I want to keep the object locked while I tell another worker thread to complete the work. So the first thread can go on and do something else while the worker thread finishes up. When the worker thread gets done, it unlocks the mutex. And I want the transition to be seemless so nobody else can get the mutex lock in between when thread 1 starts the work and thread 2 completes it. Something like inter_thread_mutex seems like it would work, and it would also allow the program to interact with it as if it were an ordinary mutex. So it seems like a clean solution. If there's a better solution, I'd be happy to hear that also. EDIT AGAIN: The reason I need locks to begin with is that there are multiple master threads, and the locks are there to prevent them from accessing shared objects concurrently in invalid ways. So the code already uses loop-level lock-free sequencing of operations at the master thread level. Also, in the original implementation, there were no worker threads, and the mutexes were ordinary kosher mutexes. The inter_thread_thingy came up as an optimization, primarily to improve response time. In many cases, it was sufficient to guarantee that the "first part" of operation A, occurs before the "first part" of operation B. As a dumb example, say I punch object 1 and give it a black eye. Then I tell object 1 to change it's internal structure to reflect all the tissue damage. I don't want to wait around for the tissue damage before I move on to punch object 2. However, I do want the tissue damage to occur as part of the same operation; for example, in the interim, I don't want any other thread to reconfigure the object in such a way that would make tissue damage an invalid operation. (yes, this example is imperfect in many ways, and no I'm not working on a game) So we made the change to a model where ownership of an object can be passed to a worker thread to complete an operation, and it actually works quite nicely; each master thread is able to get a lot more operations done because it doesn't need to wait for them all to complete. And, since the event sequencing at the master thread level is still loop-based, it is easy to write high-level master-thread operations, as they can be based on the assumption that an operation is complete when the corresponding function call returns. Finally, I thought it would be nice to use inter_thread mutex/semaphore thingies using RAII with boost locks to encapsulate the necessary synchronization that is required to make the whole thing work.

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  • Watching a variable for changes without polling.

    - by milkfilk
    I'm using a framework called Processing which is basically a Java applet. It has the ability to do key events because Applet can. You can also roll your own callbacks of sorts into the parent. I'm not doing that right now and maybe that's the solution. For now, I'm looking for a more POJO solution. So I wrote some examples to illustrate my question. Please ignore using key events on the command line (console). Certainly this would be a very clean solution but it's not possible on the command line and my actual app isn't a command line app. In fact, a key event would be a good solution for me but I'm trying to understand events and polling beyond just keyboard specific problems. Both these examples flip a boolean. When the boolean flips, I want to fire something once. I could wrap the boolean in an Object so if the Object changes, I could fire an event too. I just don't want to poll with an if() statement unnecessarily. import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* * Example of checking a variable for changes. * Uses dumb if() and polls continuously. */ public class NotAvoidingPolling { public static void main(String[] args) { boolean typedA = false; String input = ""; System.out.println("Type 'a' please."); while (true) { InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); try { input = br.readLine(); } catch (IOException ioException) { System.out.println("IO Error."); System.exit(1); } // contrived state change logic if (input.equals("a")) { typedA = true; } else { typedA = false; } // problem: this is polling. if (typedA) System.out.println("Typed 'a'."); } } } Running this outputs: Type 'a' please. a Typed 'a'. On some forums people suggested using an Observer. And although this decouples the event handler from class being observed, I still have an if() on a forever loop. import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Observable; import java.util.Observer; /* * Example of checking a variable for changes. * This uses an observer to decouple the handler feedback * out of the main() but still is polling. */ public class ObserverStillPolling { boolean typedA = false; public static void main(String[] args) { // this ObserverStillPolling o = new ObserverStillPolling(); final MyEvent myEvent = new MyEvent(o); final MyHandler myHandler = new MyHandler(); myEvent.addObserver(myHandler); // subscribe // watch for event forever Thread thread = new Thread(myEvent); thread.start(); System.out.println("Type 'a' please."); String input = ""; while (true) { InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); try { input = br.readLine(); } catch (IOException ioException) { System.out.println("IO Error."); System.exit(1); } // contrived state change logic // but it's decoupled now because there's no handler here. if (input.equals("a")) { o.typedA = true; } } } } class MyEvent extends Observable implements Runnable { // boolean typedA; ObserverStillPolling o; public MyEvent(ObserverStillPolling o) { this.o = o; } public void run() { // watch the main forever while (true) { // event fire if (this.o.typedA) { setChanged(); // in reality, you'd pass something more useful notifyObservers("You just typed 'a'."); // reset this.o.typedA = false; } } } } class MyHandler implements Observer { public void update(Observable obj, Object arg) { // handle event if (arg instanceof String) { System.out.println("We received:" + (String) arg); } } } Running this outputs: Type 'a' please. a We received:You just typed 'a'. I'd be ok if the if() was a NOOP on the CPU. But it's really comparing every pass. I see real CPU load. This is as bad as polling. I can maybe throttle it back with a sleep or compare the elapsed time since last update but this is not event driven. It's just less polling. So how can I do this smarter? How can I watch a POJO for changes without polling? In C# there seems to be something interesting called properties. I'm not a C# guy so maybe this isn't as magical as I think. private void SendPropertyChanging(string property) { if (this.PropertyChanging != null) { this.PropertyChanging(this, new PropertyChangingEventArgs(property)); } }

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