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Rules Manager and Expression Filter getting removed

- by Mike Dietrich

I doubt that many people are using the Oracle features "Rules Manager" and "Expression Filter" as usually people handle these things (such as ensuring that a zip code or a car number plate has a certain format) within the application code and not inside the database. Oracle Beehive for instance uses that just on the side. Anyway, just learned today that Rules Manager and Expression Filter components will get removed once our next database release most likely called Oracle Database 12c will get released. So before upgrading to Oracle Database 12c you can remove EXF and RUL components (SELECT COMP_ID FROM DBA_REGISTRY WHERE COMP_ID IN ('EXF','RUL'); ). You'd simply do that by executing the following script before upgrade:SQL> @?/rdbms/admin/catnoexf.sqlThis will clean up Rules Manager and Expression Filter components inside the database. You could run ?/rdbms/admin/catnorul.sql before but I believe catnoexf.sql will clean up everything already. And you'll find all this information plus guidelines for migration of existing content in MOS Note: 1233535.1 - Obsolescence Notice: Rules Manager and Expression Filter Features of Oracle Database -M.

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How to Avoid a Busy Loop Inside a Function That Returns the Object That's Being Waited For

- by Carl Smith

I have a function which has the same interface as Python's input builtin, but it works in a client-server environment. When it's called, the function, which runs in the server, sends a message to the client, asking it to get some input from the user. The user enters some stuff, or dismisses the prompt, and the result is passed back to the server, which passes it to the function. The function then returns the result. The function must work like Python's input [that's the spec], so it must block until it has the result. This is all working, but it uses a busy loop, which, in practice, could easily be spinning for many minutes. Currently, the function tells the client to get the input, passing an id. The client returns the result with the id. The server puts the result in a dictionary, with the id as the key. The function basically waits for that key to exist. def input(): '''simplified example''' key = unique_key() tell_client_to_get_input(key) while key not in dictionary: pass return dictionary.pop(pin) Using a callback would be the normal way to go, but the input function must block until the result is available, so I can't see how that could work. The spec can't change, as Python will be using the new input function for stuff like help and pdb, which provide their own little REPLs. I have a lot of flexibility in terms of how everything works overall, but just can't budge on the function acting exactly like Python's. Is there any way to return the result as soon as it's available, without the busy loop?

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How do I get a button to show on mouseover using jQuery?

- by sharataka

I am trying to get a button to appear over an image when there is a mouseover event over the image. I have multiple images on the screen that I would like to have the same functionality. I'm having trouble getting this to work as the button is always present. Any advice on how to get it to work? Below is the rendered html and javascript. javascript <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script> <script src="http://code.jquery.com/jquery.min.js" type="text/javascript"></script> <script type = "text/javascript"> $(document).ready(function() { $('.image').mouseover(function(){ $('.munchbutton').show(); }); }); </script> css div.munchbutton{ position: absolute; bottom: 5px; right: 0px; left: 60px; } div.wrapper{ float:left; /* important */ position:relative; /* important(so we can absolutely position the description div */ padding: 5px; } html  <div class='wrapper'>  <div class="image" style="position: relative; left: 0; top: 0;"> <a href="/partners/Business/CNNMoney" > <img src="/static/CNNMoney.png" style="position: relative; top: 0; left: 0;"/> </a>  <div class='munchbutton'> <form method='post'><div style='display:none'><input type='hidden' name='csrfmiddlewaretoken' value='7wq8pRYNCDkXUGRv7eU6qI1BU7RKyoT8' /></div> <input type="hidden" name="channel" id="channel" value="CNNMoney" /> <input type='submit' class = 'add' value='Add to plate'/> </form> </div>  </div>  </div>   <div class='wrapper'>  <div class="image" style="position: relative; left: 0; top: 0;"> <a href="/partners/Business/EconomistMagazine" > <img src="/static/EconomistMagazine.png" style="position: relative; top: 0; left: 0;"/> </a>  <div class='munchbutton'> <form method='post'><div style='display:none'><input type='hidden' name='csrfmiddlewaretoken' value='7wq8pRYNCDkXUGRv7eU6qI1BU7RKyoT8' /></div> <input type="hidden" name="channel" id="channel" value="EconomistMagazine" /> <input type='submit' class = 'add' value='Add to plate'/> </form> </div>  </div>  </div> 

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Why is my HDD going back from standy?

- by Pablo

My hard drives, connected to Ubuntu server are producing the following log every exactly 5 minutes. Nov 1 14:10:50 localhost kernel: [ 1602.884936] ata2.00: hard resetting link Nov 1 14:10:51 localhost kernel: [ 1603.226804] ata2.01: hard resetting link Nov 1 14:10:52 localhost kernel: [ 1604.274533] ata2.00: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Nov 1 14:10:52 localhost kernel: [ 1604.274548] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Nov 1 14:10:52 localhost kernel: [ 1604.356669] ata2.00: configured for UDMA/133 Nov 1 14:10:52 localhost kernel: [ 1604.375247] ata2.01: configured for UDMA/133 Nov 1 14:10:52 localhost kernel: [ 1604.375265] ata2: EH complete I don't think this is related to hard drive failure, because it happens for ALL hard drives connected and ONLY when I write spindown_time = 12 in /etc/hdparm.conf. The reason I add this value is to put disks into standby mode after 60 seconds, which is happening after that period (checked with hdparm -C). The first clue I thought that smartd was running and spinning the drive. However, I couldn't find it in ps -aux | grep smart. Additionally, iostat does show that nobody accessed those drives, since Blk_read, Blk_wrtn remain unchanged. I also killed all processes that may be doing something with hdd(eg SAMBA). So I guess the problem is solely with hdparm... I have no more clue where that 5 minute value hides.

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Login Screen hangs after entering password

- by Ravi

When I enter my password in the login box nothing happens. It gets stuck. It was running fine earlier. I have installed gnome-panel and cairo-dock, after which, I logged out, logged back in, and choose gnome classic session. I also added a ppa from the webupd8.org to install the themes (link). I opened Ubuntu Tweak tool, and changed the theme to Evolve the whole laptop stopped responding. The keyboard and mouse were unresponsive. So I was forced to do a shut down. Now whenever it starts, I cannot login into Ubuntu. I hear the fan noise, as its spinning very fast, when the laptop freezes.(Probably the CPU is running at 100%). Please help me. How can I login back to Ubuntu? I am using Ubuntu 12.04 and have installed all the latest updates.. EDIT: I want to know how can I delete a folder from the file system using the live CD?

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Farseer circle hangs where it's spawned

- by necrosmash

I'm currently trying to simply spawn a circle in Farseer. However, it's stuck wherever I spawn it! The game is updating fine, as I can see the circle spinning in place when I spawn it because of how I currently have gravity set up (following code from Game1.cs): // Initialise the screen center for use with // the Level class screenCenter = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2f, graphics.GraphicsDevice.Viewport.Height / 2f); world = new World(new Vector2(20, 20)); currentLevel = new Level1(screenCenter, circleSprite, groundSprite, ref world); Level1 constructor: public Level1(Vector2 screenCenter, Texture2D circleSprite, Texture2D groundSprite, ref World world) { player = new Player(ref world, screenCenter, circleSprite); ground = new Ground(ref world, screenCenter, groundSprite); listLevelItems = new List<LevelItem>(); listLevelItems.Add(player); listLevelItems.Add(ground); } Player constructor: public Player(ref World world, Vector2 screenCenter, Texture2D sprite) { setSprite(sprite); setPosition((screenCenter / MeterInPixels) + new Vector2(0f, 0f)); playerBody = BodyFactory.CreateCircle(world, 96f / (2f * MeterInPixels), 1f, playerPosition); getBody().BodyType = BodyType.Dynamic; // Ball bounce and friction getBody().Restitution = 0.3f; getBody().Friction = 0.5f; } If I use a breakpoint and change the playerBody position while the game is halted, the ball does move, but stays fixed in its new location. Any help would be greatly appreciated.

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Using Subdomains for Newly Regional Company

- by Taylord22

The company I work for is expanding their business to new territories. I've got a lot of stabilization to do in the region/state where we're one of the most well known companies of our kind. Currently, we have 3 distinct product lines which are currently distinguished by 3 separate URLS. This is affecting the user flow of our site, so we'd like to clean it up before launching our products into the various regions. The business has decided to grow into 5 new states (one state consisting of one county only) — none of which will feature all 3 products. Our homebase state is the only one that will have all 3 products this year. My initial thought was to use subdomains to separate out the regions, that way we could use a canonical tag to stabilize the root domain (which would feature home state content, and support content for all regions), and remove us from potential duplicate content penalization. Our product content will be nearly identical across the regions for the first year. I second guessed myself by thinking that it was perhaps better to use a "[product].root/region" URL instead. And I'm currently stuck by wondering if it was not better to build out subdomains for products and regions...using one modifier or the other as a funnel/branding page into the other. For instance, user lands on "region.root.com" and sees exactly what products we offer in that region. Basically, a tailored landing page. Meanwhile the bulk of the product content would actually live under "product.root.com/region/page". My head is spinning. And while searching for similar questions I also bumped into reference of another tag meant to be used in some similar cases to mine. I feel like there's a lot of risks involved in this subdomain strategy, but I also can't help but see the benefits in the user flow.

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How do I remove an element class after success?

- by sharataka

When the user clicks on a button in the form associated with it's image, I'd like the image to disappear on success. I'm having trouble implementing this. Any advice? <script type="text/javascript"> $(document).ready(function() { $(".removebutton").submit(function(event){ event.preventDefault(); $.ajax({ type:"POST", url:"/munch_video/", data: { 'video_id': $('.video_id', this).val(), // from form 'playlist': $('.playlist').val(), // from form 'add_remove': $('.add_remove').val(), // from form }, success: function(message){ alert(message); $('.span8').removeClass('.video_id', this); } }); return false; }); }); </script> <div class = "span8" style = "width: 900px;">  <div class='wrapper huluDotCom'>  <div class="image" style="position: relative; left: 0; top: 0;"> <a href = "/partners/Business/huluDotCom"> <img src = "/huluDotCom.png"> </a>  <div class='munchbutton'> <form method='post' action = '/munch_video/ ' class = 'removebutton'><div style='display:none'><input type='hidden' name='csrfmiddlewaretoken' value='dKrS8NzqPWFLM6u8wJrAeid4nGw1avGK' /></div> <input type="hidden" value="Channel" class = "playlist"/> <input type="hidden" value="huluDotCom" class = "video_id"/> <input type="hidden" value="remove_video" class = "add_remove"/> <input type='submit' class="btn btn-danger" value='Remove from plate'/> </form> </div>  </div>  </div>   <div class='wrapper TheEllenShow'>  <div class="image" style="position: relative; left: 0; top: 0;"> <a href = "/partners/Business/TheEllenShow"> <img src = "/TheEllenShow.png"> </a>  <div class='munchbutton'> <form method='post' action = '/munch_video/ ' class = 'removebutton'><div style='display:none'><input type='hidden' name='csrfmiddlewaretoken' value='dKrS8NzqPWFLM6u8wJrAeid4nGw1avGK' /></div> <input type="hidden" value="Channel" class = "playlist"/> <input type="hidden" value="TheEllenShow" class = "video_id"/> <input type="hidden" value="remove_video" class = "add_remove"/> <input type='submit' class="btn btn-danger" value='Remove from plate'/> </form> </div>  </div>  </div>  </div>

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Android ListView - Slide Subview in from Right?

- by Chris

I have a ListView. When I select an item in the ListView, I would like to have a Subview slide in from the right, the way that it does in many Apps. I have been searching for tutorials on this topic but am spinning my wheels. Maybe Android uses a term different than "Subview" ? Here's what I ended up doing: Create a New Class for the SubView Add the Subview class to the Manifest with <activity android:name=".SubViewClassName" /> inside the <application> tag Add this to the main Class ("lv" is the ListView) lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View view,int position, long id) { Intent myIntent = new Intent(view.getContext(),SubView.class); startActivityForResult(myIntent, 0); } });

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Updating a progress bar while wpf data binding is taking place (in c#)

- by evan

I bind a large dataset to a WPF list box which can take a long time (more than ten seconds). While the the data is being bound I'd like to display a circular progress bar I can't get the progress bar to show while the data binding is occurring, even though I am trying to do the binding in a backgroundworker. I tested it by making the first line of the backgroundworkd's dowork event a Thread.Sleep(5000) and sure enough the progress bar started spinning for that duration only to freeze while when the binding started. Is this because both the databinding and the UI updating have to occur on the same thread? Any ideas on how to work around it? Thanks for your help!!

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Stack data storage order

- by Jamie Dixon

When talking about a stack in either computing or "real" life we usually assume a "first on, last off" type of functionality. Because the idea of a stack is based around something in the physical world, does it matter how the data in the stack is stored? I notice in a lot of examples that the storage of the stack data is quite often done using an array and the newest item added to the stack is placed at the bottom of the array. (like adding a new plate to an existing stack of plates except putting it underneath the other plates rather than on top). As a paradigm, does it matter in what order the data is stored within the stack as long as the operation of the stack acts as expected?

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iPhone Icon file in bundle blank when building for App store distribution

- by Boiler Bill

I have been spinning my wheels for a couple hours on why when I build my app with my distribution cert with the device as the target the Icon.png file in the bundle is empty. If I build with my developer cert or against the simulator the Icon.png in the bundle matches the one in my project file. I have verified my Icon.png is 57X57, has no alpha channel, had extra finder attributes removed. I even took one of the Icon.png files from my first application that is in the store today, and it didn't work either. Here is the output from the build results: CopyPNGFile build/Distribution-iphoneos/myApp.app/Icon.png Icon.png cd /Users/wrbarbour/projects/myAppTWO/myApp setenv COPY_COMMAND /Developer/Library/PrivateFrameworks/DevToolsCore.framework/Resources/pbxcp setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" "/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Plug-ins/iPhoneOS Build System Support.xcplugin/Contents/Resources/copypng" -compress "" /Users/wrbarbour/projects/myAppTWO/myApp/Icon.png /Users/wrbarbour/projects/myAppTWO/myApp/build/Distribution-iphoneos/myApp.app/Icon.png Can someone get me pointed in the right direction?

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How to Debug XAML Parsing Errors in Silverlight?

- by Nick Gotch

I run into the following issue semi-regularly: I make changes to XAML or some resources used by it and when I go to load up the Silverlight project in debug mode it only gets as far as the spinning Silverlight-loading animation. I've tried attaching the VS08 debugger to the process but it doesn't do anything at this point (works fine once I'm in the Silverlight but not before.) From previous experience I've noticed this happens when there're problems with the XAML or the resources in it but my only solution so far has been to dissect the code line-by-line until I spot the problem. Is there an easy way to debug/diagnose these situations? UPDATE I found this question with some help, but it still doesn't provide a good way to debug these types of issues.

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Hung JVM consuming 100% CPU

- by Bogdan

We have a JAVA server running on Sun JRE 6u20 on Linux 32-bit (CentOS). We use the Server Hotspot with CMS collector with the following options (I've only provided the relevant ones): -Xmx896m -Xss128k -XX:NewSize=384M -XX:MaxPermSize=96m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC Sometimes, after running for a while, the JVM seems to slip into a hung state, whereby even though we don't make any requests to the application, the CPU continues to spin at 100% (we have 8 logical CPUs, so it looks like only one CPU does the spinning). In this state the JVM doesn't respond to SIGHUP signals (kill -3) and we can't connect to it normally with jstack. We CAN connect with "jstack -F", but the output is dodgy (we can see lots of NullPointerExceptions from JStack apparently because it wasn't able to 'walk' some stacks). So the "jstack -F" output seems to be useless. We have run a stack dump from "gdb" though, and we were able to match the thread id that spins the CPU (we found that using "top" with a per-thread view - "H" option) with a thread stack that appears in the gdb result and this is how it looks like: Thread 443 (Thread 0x7e5b90 (LWP 26310)): #0 0x0115ebd3 in CompactibleFreeListSpace::block_size(HeapWord const*) const () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #1 0x01160ff9 in CompactibleFreeListSpace::prepare_for_compaction(CompactPoint*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #2 0x0123456c in Generation::prepare_for_compaction(CompactPoint*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #3 0x01229b2c in GenCollectedHeap::prepare_for_compaction() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #4 0x0122a7fc in GenMarkSweep::invoke_at_safepoint(int, ReferenceProcessor*, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #5 0x01186024 in CMSCollector::do_compaction_work(bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #6 0x011859ee in CMSCollector::acquire_control_and_collect(bool, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #7 0x01185705 in ConcurrentMarkSweepGeneration::collect(bool, bool, unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #8 0x01227f53 in GenCollectedHeap::do_collection(bool, bool, unsigned int, bool, int) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #9 0x0115c7b5 in GenCollectorPolicy::satisfy_failed_allocation(unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #10 0x0122859c in GenCollectedHeap::satisfy_failed_allocation(unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #11 0x0158a8ce in VM_GenCollectForAllocation::doit() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #12 0x015987e6 in VM_Operation::evaluate() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #13 0x01597c93 in VMThread::evaluate_operation(VM_Operation*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #14 0x01597f0f in VMThread::loop() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #15 0x015979f0 in VMThread::run() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #16 0x0145c24e in java_start(Thread*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #17 0x00ccd46b in start_thread () from /lib/libpthread.so.0 #18 0x00bc2dbe in clone () from /lib/libc.so.6 It seems that a JVM thread is spinning while doing some CMS related work. We have checked the memory usage on the box, there seems to be enough memory available and the system is not swapping. Has anyone come across such a situation? Does it look like a JVM bug? UPDATE I've obtained some more information about this problem (it happened again on a server that has been running for more than 7 days). When the JVM entered the "hung" state it stayed like that for 2 hours until the server was manually restarted. We have obtained a core dump of the process and the gc log. We tried to get a heap dump as well, but "jmap" failed. We tried to use jmap -F but then only a 4Mb file was written before the program aborted with an exception (something about the a memory location not being accessible). So far I think the most interesting information comes from the gc log. It seems that the GC logging stopped as well (possibly at the time when the VM thread went into the long loop): 657501.199: [Full GC (System) 657501.199: [CMS: 400352K->313412K(524288K), 2.4024120 secs] 660634K->313412K(878208K), [CMS Perm : 29455K->29320K(68568K)], 2.4026470 secs] [Times: user=2.39 sys=0.01, real=2.40 secs] 657513.941: [GC 657513.941: [ParNew: 314624K->13999K(353920K), 0.0228180 secs] 628036K->327412K(878208K), 0.0230510 secs] [Times: user=0.08 sys=0.00, real=0.02 secs] 657523.772: [GC 657523.772: [ParNew: 328623K->17110K(353920K), 0.0244910 secs] 642036K->330523K(878208K), 0.0247140 secs] [Times: user=0.08 sys=0.00, real=0.02 secs] 657535.473: [GC 657535.473: [ParNew: 331734K->20282K(353920K), 0.0259480 secs] 645147K->333695K(878208K), 0.0261670 secs] [Times: user=0.11 sys=0.00, real=0.02 secs] .... .... 688346.765: [GC [1 CMS-initial-mark: 485248K(524288K)] 515694K(878208K), 0.0343730 secs] [Times: user=0.03 sys=0.00, real=0.04 secs] 688346.800: [CMS-concurrent-mark-start] 688347.964: [CMS-concurrent-mark: 1.083/1.164 secs] [Times: user=2.52 sys=0.09, real=1.16 secs] 688347.964: [CMS-concurrent-preclean-start] 688347.969: [CMS-concurrent-preclean: 0.004/0.005 secs] [Times: user=0.00 sys=0.01, real=0.01 secs] 688347.969: [CMS-concurrent-abortable-preclean-start] CMS: abort preclean due to time 688352.986: [CMS-concurrent-abortable-preclean: 2.351/5.017 secs] [Times: user=3.83 sys=0.38, real=5.01 secs] 688352.987: [GC[YG occupancy: 297806 K (353920 K)]688352.987: [Rescan (parallel) , 0.1815250 secs]688353.169: [weak refs processing, 0.0312660 secs] [1 CMS-remark: 485248K(524288K)] 783055K(878208K), 0.2131580 secs] [Times: user=1.13 sys =0.00, real=0.22 secs] 688353.201: [CMS-concurrent-sweep-start] 688353.903: [CMS-concurrent-sweep: 0.660/0.702 secs] [Times: user=0.91 sys=0.07, real=0.70 secs] 688353.903: [CMS-concurrent-reset-start] 688353.912: [CMS-concurrent-reset: 0.008/0.008 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 688354.243: [GC 688354.243: [ParNew: 344928K->30151K(353920K), 0.0305020 secs] 681955K->368044K(878208K), 0.0308880 secs] [Times: user=0.15 sys=0.00, real=0.03 secs] .... .... 688943.029: [GC 688943.029: [ParNew: 336531K->17143K(353920K), 0.0237360 secs] 813250K->494327K(878208K), 0.0241260 secs] [Times: user=0.10 sys=0.00, real=0.03 secs] 688950.620: [GC 688950.620: [ParNew: 331767K->22442K(353920K), 0.0344110 secs] 808951K->499996K(878208K), 0.0347690 secs] [Times: user=0.11 sys=0.00, real=0.04 secs] 688956.596: [GC 688956.596: [ParNew: 337064K->37809K(353920K), 0.0488170 secs] 814618K->515896K(878208K), 0.0491550 secs] [Times: user=0.18 sys=0.04, real=0.05 secs] 688961.470: [GC 688961.471: [ParNew (promotion failed): 352433K->332183K(353920K), 0.1862520 secs]688961.657: [CMS I suspect this problem has something to do with the last line in the log (I've added some "...." in order to skip some lines that were not interesting). The fact that the server stayed in the hung state for 2 hours (probably trying to GC and compact the old generation) seems quite strange to me. Also, the gc log stops suddenly with that message and nothing else gets printed any more, probably because the VM Thread gets into some sort of infinite loop (or something that takes 2+ hours).

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iPhone Simulator locks up immediately upon Build / Run

- by Steve

I'm having a problem getting my MacBook set up to build iPhone *apps* in xCode. The iPhone Simulator locks up and shows the "spinning circle" busy icon. I've tried everything I can think of, including resetting the simulator tried all of the different hardware options tried the two debug build choices in xCode. uninstalling the SDK and completely reinstalling I downloaded the SDK today - "xcode_3.2.2_and_iphone_sdk_3.2_final" I'm just upgraded from Leopard to Snow Leopard (10.6.3). I've run all the software updates. xCode version says 3.2.2 (1650) If it matters, my MacBook is 3-4 years old, 13 inch, dual 2.16 ghz intel cores, 2 gig RAM. I've never had a single problem with it. I would be so grateful if anyone can help me thanks so much,

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Rub, regex, sentences

- by Perello

I'm currently building a code generator, which aim to generate boiler plate for me once i wrote the templates and/or translations, whatever the language i have to work with, and it has an educationnal part :p. So i have a problem with a regex in ruby. The regex aim to select whatever is between {{{ and }}}, so i can generae functions according to my needs. My regex is currently : /\{\{\{(([a-zA-Z]|\s)+)\}\}\}/m My test data set {{{Demande aaa}}} = {{{tagadatsouintsouin tutu}}} The results are : [["Demande aaa", "a"], ["tagadatsouintsouin tutu", "u"]] So the regex pick each time the last character twice. But, that's not exactly what i want, my need is more about this : /\{\{\{((\w|\W)+)\}\}\}/m But this as a flaw too, the results : [["Demande aaa}}} = {{{tagadatsouintsouin tutu", "u"]] Whereas, i wish to get [["Demande aaa"],["tagadatsouintsouin tutu"]] Any ideas to correct theses regex ? I could use 2 sets of delimiters, but it won't learn me anything.

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Is there a way to pause a CABasicAnimation?

- by mclaughlinj

I have a basic spinning animation of the iPhone. Is there any way that I can "pause" the animation so that the position of the view will be maintained? I guess one way of doing this would be to cause the animation to "complete" instead of calling "remove" on it, how would I do that? CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = HUGE_VALF; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];

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JavaScript - How to change a dom node back to an existing Google Map?

- by David Robertson

I set a div to a class which shows a spinning animated when the map is loading some data, the question is, how can I set the div back to the map (I don't want to load a new map, but load the existing one, which is assigned to a var 'map')? //map is assigned originally like this: map = new google.maps.Map(document.getElementById('map3'),options); //animated graphic is assigned to map div on load of data: document.getElementById('map3').className = "loading"; but how to get the map back? Thanks for any tips! David

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Java annotations for design patterns?

- by Greg Mattes

Is there a project that maintains annotations for patterns? For example, when I write a builder, I want to mark it with @Builder. Annotating in this way immediately provides a clear idea of what the code implements. Also, the Javadoc of the @Builder annotation can reference explanations of the builder pattern. Furthermore, navigating from the Javadoc of a builder implementation to @Builder Javadoc is made easy by annotating @Builder with @Documented. I've being slowing accumulating a small set of such annotations for patterns and idioms that I have in my code, but I'd like to leverage a more complete existing project if it exists. If there is no such project, maybe I can share what I have by spinning it off to a separate pattern/idiom annotation project. Update: I've created the Pattern Notes project in response to this discussion. Contributions welcome! Here is @Builder

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linux thread synchronization

- by johnnycrash

I am new to linux and linux threads. I have spent some time googling to try to understand the differences between all the functions available for thread synchronization. I still have some questions. I have found all of these different types of synchronizations, each with a number of functions for locking, unlocking, testing the lock, etc. gcc atomic operations futexes mutexes spinlocks seqlocks rculocks conditions semaphores My current (but probably flawed) understanding is this: semaphores are process wide, involve the filesystem (virtually I assume), and are probably the slowest. Futexes might be the base locking mechanism used by mutexes, spinlocks, seqlocks, and rculocks. Futexes might be faster than the locking mechanisms that are based on them. Spinlocks dont block and thus avoid context swtiches. However they avoid the context switch at the expense of consuming all the cycles on a CPU until the lock is released (spinning). They should only should be used on multi processor systems for obvious reasons. Never sleep in a spinlock. The seq lock just tells you when you finished your work if a writer changed the data the work was based on. You have to go back and repeat the work in this case. Atomic operations are the fastest synch call, and probably are used in all the above locking mechanisms. You do not want to use atomic operations on all the fields in your shared data. You want to use a lock (mutex, futex, spin, seq, rcu) or a single atomic opertation on a lock flag when you are accessing multiple data fields. My questions go like this: Am I right so far with my assumptions? Does anyone know the cpu cycle cost of the various options? I am adding parallelism to the app so we can get better wall time response at the expense of running fewer app instances per box. Performances is the utmost consideration. I don't want to consume cpu with context switching, spinning, or lots of extra cpu cycles to read and write shared memory. I am absolutely concerned with number of cpu cycles consumed. Which (if any) of the locks prevent interruption of a thread by the scheduler or interrupt...or am I just an idiot and all synchonization mechanisms do this. What kinds of interruption are prevented? Can I block all threads or threads just on the locking thread's CPU? This question stems from my fear of interrupting a thread holding a lock for a very commonly used function. I expect that the scheduler might schedule any number of other workers who will likely run into this function and then block because it was locked. A lot of context switching would be wasted until the thread with the lock gets rescheduled and finishes. I can re-write this function to minimize lock time, but still it is so commonly called I would like to use a lock that prevents interruption...across all processors. I am writing user code...so I get software interrupts, not hardware ones...right? I should stay away from any functions (spin/seq locks) that have the word "irq" in them. Which locks are for writing kernel or driver code and which are meant for user mode? Does anyone think using an atomic operation to have multiple threads move through a linked list is nuts? I am thinking to atomicly change the current item pointer to the next item in the list. If the attempt works, then the thread can safely use the data the current item pointed to before it was moved. Other threads would now be moved along the list. futexes? Any reason to use them instead of mutexes? Is there a better way than using a condition to sleep a thread when there is no work? When using gcc atomic ops, specifically the test_and_set, can I get a performance increase by doing a non atomic test first and then using test_and_set to confirm? *I know this will be case specific, so here is the case. There is a large collection of work items, say thousands. Each work item has a flag that is initialized to 0. When a thread has exclusive access to the work item, the flag will be one. There will be lots of worker threads. Any time a thread is looking for work, they can non atomicly test for 1. If they read a 1, we know for certain that the work is unavailable. If they read a zero, they need to perform the atomic test_and_set to confirm. So if the atomic test_and_set is 500 cpu cycles because it is disabling pipelining, causes cpu's to communicate and L2 caches to flush/fill .... and a simple test is 1 cycle .... then as long as I had a better ratio of 500 to 1 when it came to stumbling upon already completed work items....this would be a win.* I hope to use mutexes or spinlocks to sparilngly protect sections of code that I want only one thread on the SYSTEM (not jsut the CPU) to access at a time. I hope to sparingly use gcc atomic ops to select work and minimize use of mutexes and spinlocks. For instance: a flag in a work item can be checked to see if a thread has worked it (0=no, 1=yes or in progress). A simple test_and_set tells the thread if it has work or needs to move on. I hope to use conditions to wake up threads when there is work. Thanks!

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Database connection management in Spring

- by ria

Do we have to explicitly manage database resources when using Spring Framework.. liking closing all open connections etc? I have read that Spring relieves developer from such boiler plate coding... This is to answer an error that I am getting in a Spring web app: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: ORA-00020: maximum number of processes (150) exceeded The jdbcTemplate is configured in the xml file and the DAO implementation has reference to this jdbcTemplate bean which is used to query the database.

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Macros no longer working in VS2005

- by NPVN

I'm using VS2005 on Vista. I'm using some macros, but now they have suddenly stopped working. No error messages of any kind. I am not aware of having done anything that could trigger this. I have made sure that "Allow macros to run" is checked in Tools-Options-Addin/Macro Security. I have tried running the macros from a keyboard shortcut, from the Macro Explorer, and from the Macros IDE, all in vain: The little spinning icon displays shortly (<1 sec) and then disappears without the macro being executed. I have tried putting a breakpoint on the first line of the macro and then executing it from the main IDE, with no effect (the breakpoint isn't hit). I have tried the same from the Macro IDE: The state changes to "running", but the breakpoint isn't hit. I have to break the execution manually. Any ideas?

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How to check whether Application is Busy or not

- by Chandan Shetty SP

Hi, I am using "networkActivityIndicatorVisible" in UIApplication for showing network spinning gear in status bar if my WebView( I am setting "networkActivityIndicatorVisible = YES" in "webViewDidStartLoad" and reseting in "webViewDidFinishLoad" ) is busy. It works fine for single UIWebView. For Multiple UIWebViews i have used a "stack" to trace which webview is busy and which one is idle and it is working fine. My question is there is any way to know whether an application is busy or idle in application level(in UIApplication) instead of checking each webview so i can remove stack. Thanks.

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Can Java ServerSocket and Sockets using ObjectIOStreams lose packets?

- by Joel Garboden

I'm using a ServerSocket on my server and Sockets that use ObjectIOStreams to send serializable objects over the network connection. I'm developing an essentially more financial version of monopoly and thus packets being sent and confirmed as sent/received is required. Do I need to implement my own packet loss watcher or is that already taken care of with (Server)Sockets? I'm primarily asking about losing packets during network blips or whatnot, not full connection error. E.g. siblings move a lead plate between my router and computer's wi-fi adapter. http://code.google.com/p/inequity/source/browse/#svn/trunk/src/network Code can be found under network-ClientController and network-Server

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Drag Rotate UIImageView by touch

- by rockstardev

I have an UIImageView that is a subview of an UIView. I'm trying to create a drag rotate effect with the UIImageView similar to spinning a bottle but I'm having trouble calculating the radians to rotate the image by. My code below seems like it should work because I've seen a similar calculation in Flash examples. Can anyone shed some light on what I'm doing wrong? Thanks. This is the code contained in my image view subclass: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; lastLocation = [touch locationInView:[self superview]]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; CGPoint location = [touch locationInView:[self superview]]; CGFloat xDisplacement = location.x - lastLocation.x; CGFloat yDisplacement = location.y - lastLocation.y; CGFloat rad = atan2f(yDisplacement,xDisplacement); self.transform = CGAffineTransformMakeRotation(rad); }

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