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• How to call 3 threads sequentially many times?

  - by Hello

  How to call 3 threads sequentially many times? For example: In iteration 1, execution order should be "Thread0-thread1-thread2" then in iteration 2 should be same i.e "Thread0 - thread1-thread2" and so on. The sample code is just executing 3 threads only once. It is not going to 2nd iteration. Thread0 = CreateThread( NULL,0,ThreadProc0, NULL, CREATE_SUSPENDED, &ThreadID); Thread1 = CreateThread( NULL,0,ThreadProc1, NULL, CREATE_SUSPENDED, &ThreadID); Thread2 = CreateThread( NULL,0,ThreadProc2, NULL, CREATE_SUSPENDED, &ThreadID); for(i=0;i<iterations;i++) //Iterations in calling threads { ResumeThread(Thread0); WaitForSingleObject(Thread0, INFINITE); ResumeThread(Thread1); WaitForSingleObject(Thread1, INFINITE); ResumeThread(Thread2); WaitForSingleObject(Thread2, INFINITE); } // Close thread and semaphore handles

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• increasing speed and efficiency of ajax call

  - by user1048824

  I'm not the most disciplined dev, dont know standards and am self-taught so bear with me. I create stuff very logically and fast but not always using 'programming standards'. I have a mobile app using geolocation API. it gets thousands of places from my db and makes gmaps v3 markers for the ones around the user's current location. there is an ajax call from my JS to an aspx page that calls the database, makes a json string, and sends the json string to the javascript that then creates the google map markers. would i save time if the json string was in a flat file? im not sure if, generally speaking, accessing a sql db from an aspx page is faster than c# file i/o on a flat file with pre-rendered JSON. (of course, using the flat file, it would update everytime the db is updated)

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• Call java program on server through web request

  - by Rossella

  I need to develop an application where a Java client calls a Java application located on the server with certain parameters, the Java application on the server computes data and sends the data back to the client. Everything needs to go through port 80 on which I have a IIS webserver listening. I cannot open any other port on the server. Is there any way I can do this? The server can write files in a directory that the client can read but I am not sure how to handle the synchronization and I don't know how to call a script on the server from the client through port 80. Every suggestion would be highly appreciated Thanks a lot in advance, this problem is making me crazy

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• Call subclass constructor from abstract class in Java

  - by Joel

  public abstract class Parent { private Parent peer; public Parent() { peer = new ??????("to call overloaded constructor"); } public Parent(String someString) { } } public class Child1 extends parent { } public class Child2 extends parent { } When I construct an instance of Child1, I want a "peer" to automatically be constructed which is also of type Child1, and be stored in the peer property. Likewise for Child2, with a peer of type Child2. The problem is, on the assignment of the peer property in the parent class. I can't construct a new Child class by calling new Child1() because then it wouldn't work for Child2. How can I do this? Is there a keyword that I can use that would refer to the child class? Something like new self()?

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• Unable to call views

  - by Scott

  I'm using Sails and I when I attempt to call the login action of my UsersController. I know my routing is working, because the console.log successfully logs both the loginpassword and loginname. However, the res.view() doesn't work. Neither does returning res.view(). module.exports = { create: function(req, res) { }, destroy: function(req, res) { }, login: function(req, res) { var loginname = req.param("loginname"); var loginpassword = req.param("loginpassword"); console.log(loginname + ' ' + loginpassword); res.view(); }, logout: function(req, res) { }, _config: {} }; I have a /views/user/login.ejs and all it currently contains is a header block with some test text, but I can't get that to render at all. Any thoughts?

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• Random Complete System Unresponsiveness Running Mathematical Functions

  - by Computer Guru

  I have a program that loads a file (anywhere from 10MB to 5GB) a chunk at a time (ReadFile), and for each chunk performs a set of mathematical operations (basically calculates the hash). After calculating the hash, it stores info about the chunk in an STL map (basically <chunkID, hash>) and then writes the chunk itself to another file (WriteFile). That's all it does. This program will cause certain PCs to choke and die. The mouse begins to stutter, the task manager takes 2 min to show, ctrl+alt+del is unresponsive, running programs are slow.... the works. I've done literally everything I can think of to optimize the program, and have triple-checked all objects. What I've done: Tried different (less intensive) hashing algorithms. Switched all allocations to nedmalloc instead of the default new operator Switched from stl::map to unordered_set, found the performance to still be abysmal, so I switched again to Google's dense_hash_map. Converted all objects to store pointers to objects instead of the objects themselves. Caching all Read and Write operations. Instead of reading a 16k chunk of the file and performing the math on it, I read 4MB into a buffer and read 16k chunks from there instead. Same for all write operations - they are coalesced into 4MB blocks before being written to disk. Run extensive profiling with Visual Studio 2010, AMD Code Analyst, and perfmon. Set the thread priority to THREAD_MODE_BACKGROUND_BEGIN Set the thread priority to THREAD_PRIORITY_IDLE Added a Sleep(100) call after every loop. Even after all this, the application still results in a system-wide hang on certain machines under certain circumstances. Perfmon and Process Explorer show minimal CPU usage (with the sleep), no constant reads/writes from disk, few hard pagefaults (and only ~30k pagefaults in the lifetime of the application on a 5GB input file), little virtual memory (never more than 150MB), no leaked handles, no memory leaks. The machines I've tested it on run Windows XP - Windows 7, x86 and x64 versions included. None have less than 2GB RAM, though the problem is always exacerbated under lower memory conditions. I'm at a loss as to what to do next. I don't know what's causing it - I'm torn between CPU or Memory as the culprit. CPU because without the sleep and under different thread priorities the system performances changes noticeably. Memory because there's a huge difference in how often the issue occurs when using unordered_set vs Google's dense_hash_map. What's really weird? Obviously, the NT kernel design is supposed to prevent this sort of behavior from ever occurring (a user-mode application driving the system to this sort of extreme poor performance!?)..... but when I compile the code and run it on OS X or Linux (it's fairly standard C++ throughout) it performs excellently even on poor machines with little RAM and weaker CPUs. What am I supposed to do next? How do I know what the hell it is that Windows is doing behind the scenes that's killing system performance, when all the indicators are that the application itself isn't doing anything extreme? Any advice would be most welcome.

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• Optimizing JS Array Search

  - by The.Anti.9

  I am working on a Browser-based media player which is written almost entirely in HTML 5 and JavaScript. The backend is written in PHP but it has one function which is to fill the playlist on the initial load. And the rest is all JS. There is a search bar that refines the playlist. I want it to refine as the person is typing, like most media players do. The only problem with this is that it is very slow and laggy as there are about 1000 songs in the whole program and there is likely to be more as time goes on. The original playlist load is an ajax call to a PHP page that returns the results as JSON. Each item has 4 attirbutes: artist album file url I then loop through each object and add it to an array called playlist. At the end of the looping a copy of playlist is created, backup. This is so that I can refine the playlist variable when people refine their search, but still repopulated it from backup without making another server request. The method refine() is called when the user types a key into the searchbox. It flushes playlist and searches through each property (not including url) of each object in the backup array for a match in the string. If there is a match in any of the properties, it appends the information to a table that displays the playlist, and adds it to the object to playlist for access by the actual player. Code for the refine() method: function refine() { $('#loadinggif').show(); $('#library').html("<table id='libtable'><tr><th>Artist</th><th>Album</th><th>File</th><th>&nbsp;</th></tr></table>"); playlist = []; for (var j = 0; j < backup.length; j++) { var sfile = new String(backup[j].file); var salbum = new String(backup[j].album); var sartist = new String(backup[j].artist); if (sfile.toLowerCase().search($('#search').val().toLowerCase()) !== -1 || salbum.toLowerCase().search($('#search').val().toLowerCase()) !== -1 || sartist.toLowerCase().search($('#search').val().toLowerCase()) !== -1) { playlist.push(backup[j]); num = playlist.length-1; $("<tr></tr>").html("<td>" + num + "</td><td>" + sartist + "</td><td>" + salbum + "</td><td>" + sfile + "</td><td><a href='#' onclick='setplay(" + num +");'>Play</a></td>").appendTo('#libtable'); } } $('#loadinggif').hide(); } As I said before, for the first couple of letters typed, this is very slow and laggy. I am looking for ways to refine this to make it much faster and more smooth.

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• Performance Optimization &ndash; It Is Faster When You Can Measure It

  - by Alois Kraus

  Performance optimization in bigger systems is hard because the measured numbers can vary greatly depending on the measurement method of your choice. To measure execution timing of specific methods in your application you usually use Time Measurement Method Potential Pitfalls Stopwatch Most accurate method on recent processors. Internally it uses the RDTSC instruction. Since the counter is processor specific you can get greatly different values when your thread is scheduled to another core or the core goes into a power saving mode. But things do change luckily: Intel's Designer's vol3b, section 16.11.1 "16.11.1 Invariant TSC The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processor's support for invariant TSC is indicated by CPUID.80000007H:EDX[8]. The invariant TSC will run at a constant rate in all ACPI P-, C-. and T-states. This is the architectural behavior moving forward. On processors with invariant TSC support, the OS may use the TSC for wall clock timer services (instead of ACPI or HPET timers). TSC reads are much more efficient and do not incur the overhead associated with a ring transition or access to a platform resource." DateTime.Now Good but it has only a resolution of 16ms which can be not enough if you want more accuracy.   Reporting Method Potential Pitfalls Console.WriteLine Ok if not called too often. Debug.Print Are you really measuring performance with Debug Builds? Shame on you. Trace.WriteLine Better but you need to plug in some good output listener like a trace file. But be aware that the first time you call this method it will read your app.config and deserialize your system.diagnostics section which does also take time.   In general it is a good idea to use some tracing library which does measure the timing for you and you only need to decorate some methods with tracing so you can later verify if something has changed for the better or worse. In my previous article I did compare measuring performance with quantum mechanics. This analogy does work surprising well. When you measure a quantum system there is a lower limit how accurately you can measure something. The Heisenberg uncertainty relation does tell us that you cannot measure of a quantum system the impulse and location of a particle at the same time with infinite accuracy. For programmers the two variables are execution time and memory allocations. If you try to measure the timings of all methods in your application you will need to store them somewhere. The fastest storage space besides the CPU cache is the memory. But if your timing values do consume all available memory there is no memory left for the actual application to run. On the other hand if you try to record all memory allocations of your application you will also need to store the data somewhere. This will cost you memory and execution time. These constraints are always there and regardless how good the marketing of tool vendors for performance and memory profilers are: Any measurement will disturb the system in a non predictable way. Commercial tool vendors will tell you they do calculate this overhead and subtract it from the measured values to give you the most accurate values but in reality it is not entirely true. After falling into the trap to trust the profiler timings several times I have got into the habit to Measure with a profiler to get an idea where potential bottlenecks are. Measure again with tracing only the specific methods to check if this method is really worth optimizing. Optimize it Measure again. Be surprised that your optimization has made things worse. Think harder Implement something that really works. Measure again Finished! - Or look for the next bottleneck. Recently I have looked into issues with serialization performance. For serialization DataContractSerializer was used and I was not sure if XML is really the most optimal wire format. After looking around I have found protobuf-net which uses Googles Protocol Buffer format which is a compact binary serialization format. What is good for Google should be good for us. A small sample app to check out performance was a matter of minutes: using ProtoBuf; using System; using System.Diagnostics; using System.IO; using System.Reflection; using System.Runtime.Serialization; [DataContract, Serializable] class Data { [DataMember(Order=1)] public int IntValue { get; set; } [DataMember(Order = 2)] public string StringValue { get; set; } [DataMember(Order = 3)] public bool IsActivated { get; set; } [DataMember(Order = 4)] public BindingFlags Flags { get; set; } } class Program { static MemoryStream _Stream = new MemoryStream(); static MemoryStream Stream { get { _Stream.Position = 0; _Stream.SetLength(0); return _Stream; } } static void Main(string[] args) { DataContractSerializer ser = new DataContractSerializer(typeof(Data)); Data data = new Data { IntValue = 100, IsActivated = true, StringValue = "Hi this is a small string value to check if serialization does work as expected" }; var sw = Stopwatch.StartNew(); int Runs = 1000 * 1000; for (int i = 0; i < Runs; i++) { //ser.WriteObject(Stream, data); Serializer.Serialize<Data>(Stream, data); } sw.Stop(); Console.WriteLine("Did take {0:N0}ms for {1:N0} objects", sw.Elapsed.TotalMilliseconds, Runs); Console.ReadLine(); } } The results are indeed promising: Serializer Time in ms N objects protobuf-net   807 1000000 DataContract 4402 1000000 Nearly a factor 5 faster and a much more compact wire format. Lets use it! After switching over to protbuf-net the transfered wire data has dropped by a factor two (good) and the performance has worsened by nearly a factor two. How is that possible? We have measured it? Protobuf-net is much faster! As it turns out protobuf-net is faster but it has a cost: For the first time a type is de/serialized it does use some very smart code-gen which does not come for free. Lets try to measure this one by setting of our performance test app the Runs value not to one million but to 1. Serializer Time in ms N objects protobuf-net 85 1 DataContract 24 1 The code-gen overhead is significant and can take up to 200ms for more complex types. The break even point where the code-gen cost is amortized by its faster serialization performance is (assuming small objects) somewhere between 20.000-40.000 serialized objects. As it turned out my specific scenario involved about 100 types and 1000 serializations in total. That explains why the good old DataContractSerializer is not so easy to take out of business. The final approach I ended up was to reduce the number of types and to serialize primitive types via BinaryWriter directly which turned out to be a pretty good alternative. It sounded good until I measured again and found that my optimizations so far do not help much. After looking more deeper at the profiling data I did found that one of the 1000 calls did take 50% of the time. So how do I find out which call it was? Normal profilers do fail short at this discipline. A (totally undeserved) relatively unknown profiler is SpeedTrace which does unlike normal profilers create traces of your applications by instrumenting your IL code at runtime. This way you can look at the full call stack of the one slow serializer call to find out if this stack was something special. Unfortunately the call stack showed nothing special. But luckily I have my own tracing as well and I could see that the slow serializer call did happen during the serialization of a bool value. When you encounter after much analysis something unreasonable you cannot explain it then the chances are good that your thread was suspended by the garbage collector. If there is a problem with excessive GCs remains to be investigated but so far the serialization performance seems to be mostly ok.  When you do profile a complex system with many interconnected processes you can never be sure that the timings you just did measure are accurate at all. Some process might be hitting the disc slowing things down for all other processes for some seconds as well. There is a big difference between warm and cold startup. If you restart all processes you can basically forget the first run because of the OS disc cache, JIT and GCs make the measured timings very flexible. When you are in need of a random number generator you should measure cold startup times of a sufficiently complex system. After the first run you can try again getting different and much lower numbers. Now try again at least two times to get some feeling how stable the numbers are. Oh and try to do the same thing the next day. It might be that the bottleneck you found yesterday is gone today. Thanks to GC and other random stuff it can become pretty hard to find stuff worth optimizing if no big bottlenecks except bloatloads of code are left anymore. When I have found a spot worth optimizing I do make the code changes and do measure again to check if something has changed. If it has got slower and I am certain that my change should have made it faster I can blame the GC again. The thing is that if you optimize stuff and you allocate less objects the GC times will shift to some other location. If you are unlucky it will make your faster working code slower because you see now GCs at times where none were before. This is where the stuff does get really tricky. A safe escape hatch is to create a repro of the slow code in an isolated application so you can change things fast in a reliable manner. Then the normal profilers do also start working again. As Vance Morrison does point out it is much more complex to profile a system against the wall clock compared to optimize for CPU time. The reason is that for wall clock time analysis you need to understand how your system does work and which threads (if you have not one but perhaps 20) are causing a visible delay to the end user and which threads can wait a long time without affecting the user experience at all. Next time: Commercial profiler shootout.

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• Call for Papers SOA &amp; Cloud Symposium by Thomas Erl

  - by Jürgen Kress

  3rd International SOA Symposium + 2nd International Cloud Symposium • Call for Presentations Berliner Congress Center, Alexanderstrase 11, 10178 Berlin, Germany (October 5-6, 2010) The International SOA and Cloud Symposium brings together lessons learned and emerging topics from SOA and Cloud projects, practitioners and experts. Please visit the Berlin & The Venue page for a map and more information. The two-day conference agenda will be organized into the following primary tracks: •  Track 1 SOA Architecture & Design •  Track 2 SOA Governance •  Track 3 Business of SOA •  Track 4 BPM, BPMN and Service-Orientation •  Track 5 Modeling from Services to the Enterprise •  Track 6 Real World SOA Case Studies •  Track 7 Real World Cloud Computing Case Studies •  Track 8 Cloud Computing Architecture, Standards & Technologies •  Track 9 REST and Service-Orientation in Practice •  Track 10 SOA Patterns & Practices •  Track 11 Modern ESB and Middleware •  Track 12 Semantic Web •  Track 13 SOA & BPM •  Track 14 Business of Cloud Computing •  Track 15 Cloud Computing Governance, Policies & Security   Presentation Submissions All submissions must be received no later than June 30, 2010. An overview of the tracks can be found here. Wiki with Additional Call for Papers: http://wiki.oracle.com/page/SOA+Call+for+Papers   Technorati Tags: soa,cloud,thomas erl,soasymposium,call for papers

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• Why would Java app make RPC call to itself?

  - by amphibient

  I am working with a multithreaded homegrown multi-module app in my new job. We use the the Thrift protocol to communicate RPC calls between different stand-alone applications in a distributed system. One of them listens on multiple ports and I just noticed that it actually makes an RPC call to itself from one thread invoked from one socket it listens to (web service call) to another port within the same app. I verified that it could accomplish the same thing if it just went and directly called the method that the remote procedure ultimately invokes as it is all within the same application, same JVM. To make it even more mysterious, the call is completely synchronous, i.e. no callbacks involved. The first thread totally sits and waits until it makes a call across the wire to itself and comes back. Now, I am perplexed why anybody would do it this way. It seems like calling somebody on the phone that sits in the same room as you do. Can anybody provide an explanation why the developer before me would come up with the above mentioned model? Maybe there is a reason and I am missing something.

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• How do you control what your C compiler Optimizes?

  - by Jordan S

  I am writing the firmware for an embedded device in C using the Silicon Labs IDE and the SDCC compiler. The device architecture is based on the 8051 family. The function in question is shown below. The function is used to set the ports on my MCU to drive a stepper motor. It gets called in by an interrupt handler. The big switch statement just sets the ports to the proper value for the next motor step. The bottom part of the function looks at an input from a hall effect sensor and a number of steps moved in order to detect if the motor has stalled. The problem is, for some reason the second IF statement that looks like this if (StallDetector > (GapSize + 20)) { HandleStallEvent(); } always seems to get optimized out. If I try to put a breakpoint at the HandleStallEvent() call the IDE gives me a message saying "No Address Correlation to this line number". I am not really good enough at reading assembly to tell what it is doing but I have pasted a snippet from the asm output below. Any help would be much appreciated. void OperateStepper(void) { //static bit LastHomeMagState = HomeSensor; static bit LastPosMagState = PosSensor; if(PulseMotor) { if(MoveDirection == 1) // Go clockwise { switch(STEPPER_POSITION) { case 'A': STEPPER_POSITION = 'B'; P1 = 0xFD; break; case 'B': STEPPER_POSITION = 'C'; P1 = 0xFF; break; case 'C': STEPPER_POSITION = 'D'; P1 = 0xFE; break; case 'D': STEPPER_POSITION = 'A'; P1 = 0xFC; break; default: STEPPER_POSITION = 'A'; P1 = 0xFC; } //end switch } else // Go CounterClockwise { switch(STEPPER_POSITION) { case 'A': STEPPER_POSITION = 'D'; P1 = 0xFE; break; case 'B': STEPPER_POSITION = 'A'; P1 = 0xFC; break; case 'C': STEPPER_POSITION = 'B'; P1 = 0xFD; break; case 'D': STEPPER_POSITION = 'C'; P1 = 0xFF; break; default: STEPPER_POSITION = 'A'; P1 = 0xFE; } //end switch } //end else MotorSteps++; StallDetector++; if(PosSensor != LastPosMagState) { StallDetector = 0; LastPosMagState = PosSensor; } else { if (PosSensor == ON) { if (StallDetector > (MagnetSize + 20)) { HandleStallEvent(); } } else if (PosSensor == OFF) { if (StallDetector > (GapSize + 20)) { HandleStallEvent(); } } } } //end if PulseMotor } ... and the asm output for the the bottom part of this function... ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:653: if(PosSensor != LastPosMagState) mov c,_P1_4 jb _OperateStepper_LastPosMagState_1_1,00158$ cpl c 00158$: jc 00126$ C$MotionControl.c$655$3$7 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:655: StallDetector = 0; clr a mov _StallDetector,a mov (_StallDetector + 1),a C$MotionControl.c$657$3$7 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:657: LastPosMagState = PosSensor; mov c,_P1_4 mov _OperateStepper_LastPosMagState_1_1,c ret 00126$: C$MotionControl.c$661$2$8 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:661: if (PosSensor == ON) jb _P1_4,00123$ C$MotionControl.c$663$4$9 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:663: if (StallDetector > (MagnetSize + 20)) mov a,_MagnetSize mov r2,a rlc a subb a,acc mov r3,a mov a,#0x14 add a,r2 mov r2,a clr a addc a,r3 mov r3,a clr c mov a,r2 subb a,_StallDetector mov a,r3 subb a,(_StallDetector + 1) jnc 00130$ C$MotionControl.c$665$5$10 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:665: HandleStallEvent(); ljmp _HandleStallEvent 00123$: C$MotionControl.c$668$2$8 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:668: else if (PosSensor == OFF) jnb _P1_4,00130$ C$MotionControl.c$670$4$11 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:670: if (StallDetector > (GapSize + 20)) mov a,#0x14 add a,_GapSize mov r2,a clr a addc a,(_GapSize + 1) mov r3,a clr c mov a,r2 subb a,_StallDetector mov a,r3 subb a,(_StallDetector + 1) jnc 00130$ C$MotionControl.c$672$5$12 ==. ; C:\SiLabs\Optec Programs\HSFW_HID_SDCC_2\MotionControl.c:672: HandleStallEvent(); C$MotionControl.c$678$2$1 ==. XG$OperateStepper$0$0 ==. ljmp _HandleStallEvent 00130$: ret It looks to me like the compiler is NOT optimizing out this second if statement from the looks of the asm but if that is the case why does the IDE not allow me so set a breakpoint there? Maybe it's just a dumb IDE!

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• Android remote service doesn't call service methods

  - by tarantel

  Hello, I'm developing a GPS tracking software on android. I need IPC to control the service from different activities. So I decide to develop a remote service with AIDL. This wasn't a big problem but now it's always running into the methods of the interface and not into those of my service class. Maybe someone could help me? Here my ADIL file: package test.de.android.tracker interface ITrackingServiceRemote { void startTracking(in long trackId); void stopTracking(); void pauseTracking(); void resumeTracking(in long trackId); long trackingState(); } And the here a short version of my service class: public class TrackingService extends Service implements LocationListener{ private LocationManager mLocationManager; private TrackDb db; private long trackId; private boolean isTracking = false; @Override public void onCreate() { super.onCreate(); mNotificationManager = (NotificationManager) this .getSystemService(NOTIFICATION_SERVICE); mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE); db = new TrackDb(this.getApplicationContext()); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); } @Override public void onDestroy(){ //TODO super.onDestroy(); } @Override public IBinder onBind(Intent intent){ return this.mBinder; } private IBinder mBinder = new ITrackingServiceRemote.Stub() { public void startTracking(long trackId) throws RemoteException { TrackingService.this.startTracking(trackId); } public void pauseTracking() throws RemoteException { TrackingService.this.pauseTracking(); } public void resumeTracking(long trackId) throws RemoteException { TrackingService.this.resumeTracking(trackId); } public void stopTracking() throws RemoteException { TrackingService.this.stopTracking(); } public long trackingState() throws RemoteException { long state = TrackingService.this.trackingState(); return state; } }; public synchronized void startTracking(long trackId) { // request updates every 250 meters or 0 sec this.trackId = trackId; mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 250, this); isTracking = true; } public synchronized long trackingState() { if(isTracking){ return trackId; } else return -1; } public synchronized void stopTracking() { if(isTracking){ mLocationManager.removeUpdates(this); isTracking = false; } else Log.i(TAG, "Could not stop because service is not tracking at the moment"); } public synchronized void resumeTracking(long trackId) { if(!isTracking){ this.trackId = trackId; mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 250, this); isTracking = true; } else Log.i(TAG, "Could not resume because service is tracking already track " + this.trackId); } public synchronized void pauseTracking() { if(isTracking){ mLocationManager.removeUpdates(this); isTracking = false; } else Log.i(TAG, "Could not pause because service is not tracking at the moment"); } public void onLocationChanged(Location location) { //TODO } For easier access from the client I wrote a ServiceManager class which sets up the ServiceConnection and you can call the service methods. Here my code for this: public class TrackingServiceManager{ private static final String TAG = "TrackingServiceManager"; private ITrackingServiceRemote mService = null; private Context mContext; private Boolean isBound = false; private ServiceConnection mServiceConnection; public TrackingServiceManager(Context ctx){ this.mContext = ctx; } public void start(long trackId) { if (isBound && mService != null) { try { mService.startTracking(trackId); } catch (RemoteException e) { Log.e(TAG, "Could not start tracking!",e); } } else Log.i(TAG, "No Service bound! 1"); } public void stop(){ if (isBound && mService != null) { try { mService.stopTracking(); } catch (RemoteException e) { Log.e(TAG, "Could not stop tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public void pause(){ if (isBound && mService != null) { try { mService.pauseTracking(); } catch (RemoteException e) { Log.e(TAG, "Could not pause tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public void resume(long trackId){ if (isBound && mService != null) { try { mService.resumeTracking(trackId); } catch (RemoteException e) { Log.e(TAG, "Could not resume tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public float state(){ if (isBound && mService != null) { try { return mService.trackingState(); } catch (RemoteException e) { Log.e(TAG, "Could not resume tracking!",e); return -1; } } else Log.i(TAG, "No Service bound!"); return -1; } /** * Method for binding the Service with client */ public boolean connectService(){ mServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { TrackingServiceManager.this.mService = ITrackingServiceRemote.Stub.asInterface(service); } } @Override public void onServiceDisconnected(ComponentName name) { if (mService != null) { mService = null; } } }; Intent mIntent = new Intent("test.de.android.tracker.action.intent.TrackingService"); this.isBound = this.mContext.bindService(mIntent, mServiceConnection, Context.BIND_AUTO_CREATE); return this.isBound; } public void disconnectService(){ this.mContext.unbindService(mServiceConnection); this.isBound = false; } } If i now try to call a method from an activity for example start(trackId) nothing happens. The binding is OK. When debugging it always runs into the startTracking() in the generated ITrackingServiceRemote.java file and not into my TrackingService class. Where is the problem? I can't find anything wrong. Thanks in advance! Tobias

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• Exchange Web Service (EWS) call fails under ASP.NET but not a console application

  - by Vince Panuccio

  I'm getting an error when I attempt to connect to Exchange Web Services via ASP.NET. The following code works if I call it via a console application but the very same code fails when executed on a ASP.NET web forms page. Just as a side note, I am using my own credentials throughout this entire code sample. "When making a request as an account that does not have a mailbox, you must specify the mailbox primary SMTP address for any distinguished folder Ids." I thought I might be able to fix the issue by specifying an impersonated user. exchangeservice.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "[email protected]"); But then I get a different error. "The account does not have permission to impersonate the requested user." The App Pool that the web application is running under is also my own account (same as the console application) so I have no idea what might be causing this issue. I am using .NET framework 3.5. Here is the code in full. var exchangeservice = new ExchangeService(ExchangeVersion.Exchange2010_SP1) { Timeout = 10000 }; var credentials = new System.Net.NetworkCredential("username", "pass", "domain"); exchangeservice.AutodiscoverUrl("[email protected]") FolderId rootFolderId = new FolderId(WellKnownFolderName.Inbox); var folderView = new FolderView(100) { Traversal = FolderTraversal.Shallow }; FindFoldersResults findFoldersResults = service.FindFolders(rootFolderId, folderView);

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• Named query not known error trying to call a stored proc using Fluent NHibernate

  - by Hamman359

  I'm working on setting up NHibernate for a project and I have a few queries that, due to their complexity, we will be leaving as stored procedures. I'd like to be able to use NHibernate to call the sprocs, but have run into an error I can't figure out. Since I'm using Fluent NHibernate I'm using mixed mode mapping as recommended here. However, when I run the app I get a "Named query not known: AccountsGetSingle" exception and I can't figure out why. I think I might have a problem with my HBM mapping since I'm not very familiar with using them but I'm not sure. My NHibernate configuration code is: private ISessionFactory CreateSessionFactory() { return Fluently.Configure() .Database(MsSqlConfiguration.MsSql2005 .ConnectionString((conn => conn.FromConnectionStringWithKey("CIDB"))) .ShowSql()) .Mappings(m => { m.HbmMappings.AddFromAssemblyOf<Account>(); m.FluentMappings.AddFromAssemblyOf<Account>(); }) .BuildSessionFactory(); } My hbm.xml file is: <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <sql-query name="AccountsGetSingle"> <return alias="Account" class="Core, Account"></return> exec AccountsGetSingle </sql-query> </hibernate-mapping> And the code where I am calling the sproc looks like this: public Account Get() { return _conversation.Session .GetNamedQuery("AccountsGetSingle") .UniqueResult<Account>(); } Any thoughts or ideas would be appreciated. Thanks.

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• Using pinvoke in c# to call sprintf and friends on 64-bit

  - by bde

  I am having an interesting problem with using pinvoke in C# to call _snwprintf. It works for integer types, but not for floating point numbers. This is on 64-bit Windows, it works fine on 32-bit. My code is below, please keep in mind that this is a contrived example to show the behavior I am seeing. class Program { [DllImport("msvcrt.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)] private static extern int _snwprintf([MarshalAs(UnmanagedType.LPWStr)] StringBuilder str, uint length, String format, int p); [DllImport("msvcrt.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)] private static extern int _snwprintf([MarshalAs(UnmanagedType.LPWStr)] StringBuilder str, uint length, String format, double p); static void Main(string[] args) { Double d = 1.0f; Int32 i = 1; Object o = (object)d; StringBuilder str = new StringBuilder(); _snwprintf(str, 32, "%10.1f", (Double)o); Console.WriteLine(str.ToString()); o = (object)i; _snwprintf(str, 32, "%10d", (Int32)o); Console.WriteLine(str.ToString()); Console.ReadKey(); } } The output of this program is 0.0 1 It should print 1.0 on the first line and not 0.0, and so far I am stumped.

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• JQuery ajax call to httpget webmethod (c#) not working

  - by Tim Jarvis

  I am trying to get an ajax get to a webmethod in code behind. The problem is I keep getting the error "parserror" from the JQuery onfail method. If I change the GET to a POST everything works fine. Please see my code below. Ajax Call <script type="text/javascript"> var id = "li1234"; function AjaxGet() { $.ajax({ type: "GET", url: "webmethods.aspx/AjaxGet", data: "{ 'id' : '" + id + "'}", contentType: "application/json; charset=utf-8", dataType: "json", async: false, success: function(msg) { alert("success"); }, error: function(msg, text) { alert(text); } }); } </script> Code Behind [System.Web.Services.WebMethod] [System.Web.Script.Services.ScriptMethod(UseHttpGet = true, ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)] public static string AjaxGet(string id) { return id; } Web.config <webServices> <protocols> <add name="HttpGet"/> </protocols> </webServices> The URL being used ......../webmethods.aspx/AjaxGet?{%20%27id%27%20:%20%27li1234%27} As part of the response it is returning the html for the page webmethods. Any help will be greatly appreciated.

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• jQuery.ajax call to Twitter succeeds but returns null for Firefox

  - by Zhami

  I've got code that makes a simple get request to Twitter (search) using jQuery's ajax method. The code works fine on Safari, but fails on Firefox (3.6.3). In the Firefox case, my jQuery.ajax parameters 'success' method is invoked, but the supplied data is null. (In Safari, I receive a boatload of JSON data). My ajax call is: $.ajax({ url: 'http://search.twitter.com/search.json?q='+searchTerm, dataType: 'json', async: true, beforeSend: function(request) { window.console.log('starting AJAX request to get Twitter data'); }, success: function(data, textStatus, request) { window.console.log('AJAX request to get Twitter succeeded: status=' + textStatus); callback(data); }, error: function(request, status, error) { window.console.log('AJAX request to get user data --> Error: ' + status); errback(request, status, error); } }); Firebug shows Response headers: Date Sun, 11 Apr 2010 22:30:26 GMT Server hi Status 200 OK X-Served-From b021 X-Runtime 0.23841 Content-Type application/json; charset=utf-8 X-Served-By sjc1o024.prod.twitter.com X-Timeline-Cache-Hit Miss Cache-Control max-age=15, must-revalidate, max-age=300 Expires Sun, 11 Apr 2010 22:35:26 GMT Vary Accept-Encoding X-Varnish 1827846877 Age 0 Via 1.1 varnish X-Cache-Svr sjc1o024.prod.twitter.com X-Cache MISS Content-Encoding gzip Content-Length 2126 Connection close The HTTP status is OK (200), the Conetnt-Type is properly application/json, and the Content-Length of 2126 (gzip'd) implies data came back. Yet Firebug shows the Response to be empty, and a test of the supplied data shows it o be 'null.' I am aware of a similar post on Stack Overflow: http://stackoverflow.com/questions/1188976/jquery-get-function-succeeds-with-200-but-returns-no-content-in-firefox and from that would assume this problem is possibly related to cross-domain security, but... I know there are many JS widgets and whatnots that ajax get data from Twitter. Is there something I need to enable to allow this?

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• ASP.NET MVC async call a WCF service.

  - by mmcteam

  Hi all. After complete of asynchronous call to WCF service I want set success message into session and show user the notification . I tried use two ways for complete this operation. 1) Event Based Model. client.GetDataCompleted += new EventHandler<GetDataCompletedEventArgs>(GetDataCompleted); client.GetDataAsync(id, client); private void GetDataCompleted(object obj, GetDataCompletedEventArgs e) { this.SetNotification(new Notification() { Message = e.Result, Type = NotificationType.Success }); } In MyOperationCompleted event i can set notification to HttpContext.Current.Session, but I must waiting before this operation will completed and can't navigate to others pages. 2) IAsyncResult Model. client.BeginGetData(id, GetDataCallback, client); private void GetDataCallback(IAsyncResult ar) { string name = ((ServiceReference1.Service1Client)ar.AsyncState).EndGetData(ar); this.SetNotification(new Notification() { Message = name, Type = NotificationType.Success }); } "Generate asynchronous operations" in service reference enabled. Please help me with this trouble. I novice in ASP.NET MVC. Thanks.

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• How to call SQL Function with multiple parameters from C# web page

  - by Marshall

  I have an MS SQL function that is called with the following syntax: SELECT Field1, COUNT(*) AS RecordCount FROM GetDecileTable('WHERE ClientID = 7 AND LocationName = ''Default'' ', 10) The first parameter passes a specific WHERE clause that is used by the function for one of the internal queries. When I call this function in the front-end C# page, I need to send parameter values for the individual fields inside of the WHERE clause (in this example, both the ClientID & LocationName fields) The current C# code looks like this: String SQLText = "SELECT Field1, COUNT(*) AS RecordCount FROM GetDecileTable('WHERE ClientID = @ClientID AND LocationName = @LocationName ',10)"; SqlCommand Cmd = new SqlCommand(SQLText, SqlConnection); Cmd.Parameters.Add("@ClientID", SqlDbType.Int).Value = 7; // Insert real ClientID Cmd.Parameters.Add("@LocationName", SqlDbType.NVarChar(20)).Value = "Default"; // Real code uses Location Name from user input SqlDataReader reader = Cmd.ExecuteReader(); When I do this, I get the following code from SQL profiler: exec sp_executesql N'SELECT Field1, COUNT(*) as RecordCount FROM GetDecileTable (''WHERE ClientID = @ClientID AND LocationName = @LocationName '',10)', N'@ClientID int,@LocationID nvarchar(20)', @ClientID=7,@LocationName=N'Default' When this executes, SQL throws an error that it cannot parse past the first mention of @ClientID stating that the Scalar Variable @ClientID must be defined. If I modify the code to declare the variables first (see below), then I receive an error at the second mention of @ClientID that the variable already exists. exec sp_executesql N'DECLARE @ClientID int; DECLARE @LocationName nvarchar(20); SELECT Field1, COUNT(*) as RecordCount FROM GetDecileTable (''WHERE ClientID = @ClientID AND LocationName = @LocationName '',10)', N'@ClientID int,@LocationName nvarchar(20)', @ClientID=7,@LocationName=N'Default' I know that this method of adding parameters and calling SQL code from C# works well when I am selecting data from tables, but I am not sure how to embed parameters inside of the ' quote marks for the embedded WHERE clause being passed to the function. Any ideas?

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• ASP.NET validation not executing in a JavaScript showModalDialog call

  - by Michael Kniskern

  I currently open a pop up window from my parent page using using a JavaScript .showModalDialog function. The pop up window contains some ASP.NET validation controls which do not display when the user clicks the ASP.NET button to submit the form. If there is an error on the page, the validation message(s) do not display, the record is not updated on the server side and the pop window closes. (The asp.net validation controls do not stop the pop up window from doing a server postback) Has anyone expereinced this behavior before and is there any way to prevent it? Here is my showModalDialong call source code: function OpenChildWindow(id) { var sFeatures = sFeatures="dialogHeight: 525px;"; sFeatures += "dialogWidth: 900px;"; sFeatures += "scroll: yes;"; sFeatures += "status: no;"; sFeatures += "resizeable: no;"; var url = "MyPopUp.aspx?ID=" + id; var childName = "ChildForm"; entryWindow = window.showModalDialog(url, childName, sFeatures); if (entryWindow == true) { window.document.getElementById("<%= btnUpdateParent.ClientID %>").click(); } } Note: When the pop up modal is closed, a ASP.NET button is "clicked" to update an ASP.NET UpdatePanel on the parent to show the changes to the record modified in the pop up window.

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• jquery ajax call from link loaded with ajax

  - by Jay

  //deep linking $("document").ready(function(){ contM = $('#main-content'); contS = $('#second-content'); $(contM).hide(); $(contM).addClass('hidden'); $(contS).hide(); $(contS).addClass('hidden'); function loadURL(URL) { //console.log("loadURL: " + URL); $.ajax({ url: URL, type: "POST", dataType: 'html', data: {post_loader: 1}, success: function(data){ $(contM).html(data); $(contM).animW(); } }); } // Event handlers $.address.init(function(event) { //console.log("init: " + $('[rel=address:' + event.value + ']').attr('href')); }).change(function(event) { $.ajax({ url: $('[rel=address:' + event.value + ']').attr('href'), type: "POST", dataType: 'html', data: {post_loader: 1}, success: function(data){ $(contM).html(data); $(contM).animW(); }}); //console.log("change"); }) $('.update-main a').live('click', function(){ loadURL($(this).attr('href')); }); $(".update-second a").live('click', function() { var link = $(this); $.ajax({ url: link.attr("href"), dataType: 'html', data: {post_loader: 1}, success: function(data){ $(contS).html(data); $(contS).animW(); }}); }); }); I'm using jquery and the 'addresses' plugin to load content with ajax and maintain pagination. The problem I'm having is some content loads with links which are intended to load content into a secondary window. I'm using the .live() method to allow jquery to listen for new links loaded into the primary content div. This works until the .ajax() method is called for these fresh links loaded with ajax, where the method begins, but follows the original link before data can be received. I'm assuming the problem is in the client-side scripting, but it may be a problem with the call made to the server. I'm using the wordpress loop to parse the url and generate the html loaded via jquery. Thanks for any tips!

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• WPF Dispatcher.UnhandledException within a ShowDialog call.

  - by Eric

  It appears that ShowDialog() invokes the Dispatcher message handling loop within. Thus, you have a stack that looks something like: Outer-most Dispatcher message loop ... x.ShowDialog() Inner Dispatcher message loop ... I am using the Dispatcher.UnhandledException to catch exceptions not handled by my code. However, it appears that the Inner Dispatcher message loop, above, is undesirably catching exceptions that my code would catch. Example: Outer-most Dispatcher message loop try/catch FooException ... x.ShowDialog() Inner Dispatcher message loop ... throw FooException What I would like is for the thrown FooException to get caught by the try/catch. However. It gets caught first by the (inner) Dispatcher.UnhandledException. I see there are ways to filter the exception. However, those filters will apply to both the inner and outer most handlers. What I am looking for is to have my Dispatcher.UnhandledException code run only on the outer-most dispatcher message loop. Does that make sense? I could, of course, reflect the call stack from within my handler to see if this is the outer-most dispatcher, but that seems a bit fragile. Other ideas? Thanks! Eric

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• NSCollectionView subclass doesn't call drawRect during drag session despite setNeedsDisplay

  - by Alain Vitry

  Greetings, I am puzzled as to how and when drawRect is supposed to be called in a NSCollectionView subclass. I implement drag and drop operation in order to move NSCollectionViewItems within the collection, and would like to draw a visual indication of where the drop would end. The subclass does not call drawRect during the drag session. (It does during scroll) Is this the intended operation ? Any hint on how to implement this behavior properly are welcome. A full xcode project of the following code is available at: http://babouk.ovh.org/dload/MyCollectionView.zip Best regards Code sample: @interface CollectionViewAppDelegate : NSObject <NSApplicationDelegate> { NSWindow *window; NSMutableArray *collectionContent; } /* properties declaration */ /* KVC compliance declarations */ @end @interface MyCollectionView : NSCollectionView @end @interface ItemModel { NSString *name; } @property (copy) NSString *name; @end @implementation MyCollectionView - (void)drawRect:(NSRect)rect { NSLog(@"DrawRect"); } - (void)mouseDragged:(NSEvent *)aEvent { NSPoint localPoint = [self convertPoint:[aEvent locationInWindow] fromView:nil]; [self dragImage:[NSImage imageNamed:@"Move.png"] at:localPoint offset:NSZeroSize event:aEvent pasteboard:nil source:self slideBack:NO]; } - (BOOL)prepareForDragOperation:(id < NSDraggingInfo >)sender { return YES; } - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender { return NSDragOperationEvery; } - (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender { [self setNeedsDisplay:YES]; return NSDragOperationEvery; } - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal { return NSDragOperationEvery; } - (void)mouseDown:(NSEvent *)theEvent { } @end @implementation CollectionViewAppDelegate @synthesize window, collectionContent, collectionView; - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSMutableArray *data = [[NSMutableArray alloc] init]; /* Fill in data */ [self setCollectionContent:data]; [data release]; } /* dealloc */ /* KVC implementation */ @end @implementation ItemModel @synthesize name; /* dealloc */ @end

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• Android Studio Could not call IncrementalTask.taskAction() on task ':project:dexDebug'

  - by akenawell85x

  I recently decided to switch from Eclipse to Android Studio. I imported a project I was working on and am now getting this error when I try to run the project. Gradle: Execution failed for task ':project:dexDebug'. > Could not call IncrementalTask.taskAction() on task ':project:dexDebug' I've been cruising this site for 2 days now and trying different suggestions to no avail. I did run gradlew compileDebug --stacktrace and this is what I got: C:\Users\adam\AndroidStudioProjects\projectProject>gradlew compileDebug --stacktrace Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0 :project:preBuild UP-TO-DATE :project:preDebugBuild UP-TO-DATE :project:preReleaseBuild UP-TO-DATE :project:prepareComAndroidSupportAppcompatV71800Library UP-TO-DATE :project:prepareComGoogleAndroidGmsPlayServices3225Library UP-TO-DATE :project:prepareDebugDependencies :project:compileDebugAidl UP-TO-DATE :project:compileDebugRenderscript UP-TO-DATE :project:generateDebugBuildConfig UP-TO-DATE :project:mergeDebugAssets UP-TO-DATE :project:mergeDebugResources UP-TO-DATE :project:processDebugManifest UP-TO-DATE :project:processDebugResources UP-TO-DATE :project:generateDebugSources UP-TO-DATE :project:compileDebug UP-TO-DATE BUILD SUCCESSFUL Total time: 10.459 secs However I am still getting that error when I try to actually run the project. Here is my build.gradle (i do have a 'libs' folder in my project with all the jars for a google maps/places app): buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.6.+' } } apply plugin: 'android' repositories { mavenCentral() } android { compileSdkVersion 18 buildToolsVersion "18.1.1" defaultConfig { minSdkVersion 8 targetSdkVersion 18 } } dependencies { compile fileTree(dir: 'libs') compile 'com.google.android.gms:play-services:3.2.25' compile 'com.android.support:support-v4:18.0.0' compile 'com.android.support:appcompat-v7:+' } and my settings.gradle: include ':project', ':project:libs:android-support-v4', ':project:libs:google-api-client-1.10.3-beta', ':project:libs:google-api-client-android2-1.10.3-beta', ':project:libs:google-http-client-1.10.3-beta', ':project:libs:google-http-client-android2-1.10.3-beta', ':project:libs:google-oauth-client-1.10.1-beta', ':project:libs:gson-2.1', ':project:libs:guava-11.0.1', ':project:libs:jackson-core-asl-1.9.4', ':project:libs:jsr305-1.3.9', ':project:libs:protobuf-java-2.2.0', ':project:libs:GoogleAdMobAdsSdk-6.4.1' As I said, I've tried pretty much everything I have read on here about this error and am having no luck. Any help would be greatly appreciated.

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• Call to undefined function query() - using PDO in PHP

  - by webworm

  I have a written a script in PHP that reads from data from a MySQL database. I am new to PHP and I have been using the PDO library. I have been developing on a Windows machine using the WAMP Server 2 and all has been working well. However, when I uploaded my script to the LINUX server where it will be used I get the following error when I run my script. Fatal error: Call to undefined function query() This is the line where the error is occuring ... foreach($dbconn->query($sql) as $row) The variable $dbconn is first defined in my dblogin.php include file which I am listing below. <?php // Login info for the database $db_hostname = 'localhost'; $db_database = 'MY_DATABASE_NAME'; $db_username = 'MY_DATABASE_USER'; $db_password = 'MY_DATABASE_PASSWORD'; $dsn = 'mysql:host=' . $db_hostname . ';dbname=' . $db_database . ';'; try { $dbconn = new PDO($dsn, $db_username, $db_password); $dbconn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { echo 'Error connecting to database: ' . $e->getMessage(); } ?> Inside the function where the error occurs I have the database connection defined as a superglobal as such ... global $dbconn; I am a bit confused as to what is happening since all worked well on my development machine. I was wondering if the PDO library was installed but from what I thought it was installed by default as part of PHP v5. The script is running on an Ubuntu (5.0.51a-3ubuntu5.4) machine and the PHP version is 5.2.4. Thank you for any suggestions. I am really lost on this.

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