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• Open Source Queuing Solutions for peek, mark as done and then remove

  - by user330114

  I am looking at open source queuing platforms that allow me do the following: I have multiple producers, multiple consumers putting data into a queue in a multithreaded environment with the specific use case: I want the ability for consumers to be able do the following Peek at a message from the queue(which should mark as the message as invisible on the queue so that other consumers cannot consume the same message) The consumer works on the message consumed and if it is able to do the work successfully, it marks the message as consumed which should permanently delete it from the queue. If the consumer dies abruptly after marking the message as consumed or fails to acknowledge successful consumption after a certain timeout, the message is made visible on the queue again so that another consumer can pick it up. I've been looking at RabbitMQ, hornetQ, ActiveMQ but I'm not sure I can get this functionality out of the box, any recommendations on a system that gives me this functionality?

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• Doctrine2 Mutliple DBs without Symfony2?

  - by ehime

  Hey guys I know that using the Doctrinebundle in Symfony2 it is possible to instantiate multiple DB connections under Doctrine... $connectionFactory = $this->container->get('doctrine.dbal.connection_factory'); $connection = $connectionFactory->createConnection(array( 'driver' => 'pdo_mysql', 'user' => 'foo_user', 'password' => 'foo_pass', 'host' => 'foo_host', 'dbname' => 'foo_db', )); I'm curious if this is the case if you are using PURELY Doctrine though?, I've set up Doctrine via Composer like so... { "config": { "vendor-dir": "lib/" }, "require": { "doctrine/orm": "2.3.4", "doctrine/dbal": "2.3.4" } } And have been looking for my ConnectionFactory class but am not seeing it anywhere? Am I required to use Symfony2 to do this? Thanks!

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• UINavigationController Right button

  I am unable to set any property of parentController (which is always a UINavigationController in my case) from child views. e.g. I want to add a button on the navigation bar using following code: UINavigationController* parentController = (UINavigationController)self.parentViewController; UIBarButtonItem *addButton = [[[UIBarButtonItem alloc] initWithTitle:@"Something" style:UIBarButtonItemStyleBordered target:self action:@selector(doSomething)] autorelease]; [_parentController.navigationItem setRightBarButtonItem:addButton animated:YES]; This code runs perfectly without errors but I can't see any button added to the navigation bar. Thanks in advance.

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• Are there any kata for practice VIM?

  - by Grzegorz Gierlik

  I've used VIM for many years as my primary text editor. And I am still learning how to use VIM for various editing tasks. The problem is that even if I learn something and use it once a week I forgot soon how I did it -- classic case is search and replace in many buffers using bufdo :(. I was wondering if there is any kata to daily VIM practice including many VIM commands: open existing files, create new files, edit files and move around: move cursor (beginning & end of line/function/block/screen, top & bottom of screen, move screen line up/down, etc.), mark, copy & paste, insert & remove characters/words/lines, move between buffers, move between windows, arrange windows, search & replace, repeat last command, formatting (=), probably some more (bookmarks, macros). save files, create/update/save an open projects (mksession and source). Do you know any kata for VIM of tutorial which could help to practice all above (and more) VIM commands?

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• htaccess handler

  - by Steve

  Hi Everyone, I have strange problem that need help. It is about rewrite using apache. Here my .htaccess content file: Options +FollowSymLinks ## This is an example .htaccess-file ## To get everything automatically parsed, the following line is needed #set link auto on ##From now on, every RewriteRule gets recognised. RewriteEngine on RewriteRule captcha(\.html){0,1}$ captcha.php [QSA,L] RewriteCond %{SCRIPT_FILENAME} !-s RewriteCond %{SCRIPT_FILENAME} !-d RewriteCond %{SCRIPT_FILENAME} !-f Rewriterule (.*) handler.php ##You can also change the text before the real link by the following line With this rule, I am hoping that all request except there is exists in file or directory will be directed to my custom handler: handler.php. Everyting just fine as expected but this case not: http://../test/form_login/query=%2Ftest%2Findex.php%3Fpage%3Dform& Root url: /test/, form_login is not file or directory index.php is exists in the root. Apache response with : 404 Page Not Found Thanks for any of your help. Regards, Steve

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• Best PHP framework for an experienced PHP developer?

  - by andybaird

  Okay, before I start this, I am well aware of how subjective this question is. For my case, I'd like to define the 'best' for me as: Rapid development "Pretty" URLs Data validation Good knowledge base available Not impossible to integrate other PHP software with This is a pretty generic definition, but all I'm looking for here is opinions. Edited: Here's a better way to ask this question: You have two weeks to create a full scale booking and scheduling system that accepts Google Checkout payments (via the API) and integrates with an open source message board software. Which framework do you choose and why?

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• Exception thrown while working with JTabbedPane

  - by Halo

  I'm using a JTabbedPane in my application and I listen to its changes with ChangeListener so that I can know which tab is currently selected. So my stateChanged method is; public void stateChanged(ChangeEvent e) { currentPageIndex = jTabbedPane.getSelectedIndex(); } But while I'm adding new tabs to the JTabbedPane it throws an ArrayIndexOutOfBoundsException in the method above, I don't know why. Some suggested for a similar case that this is a bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4873983, but as you'll see some says the solution is to work with Swing from EventDispatchThread. What does it mean, do they mean the SwingUtilities.invokeLater thing? Can someone show me how I can modify my stateChanged method accordingly to avoid the exception?

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• JMS have javax.jms.InvalidDestinationException when client stop working

  - by Tran

  I use JMS for sending requests from a client to a server. My client sends a request to the server. While the server is working with my request, my client stops (network problem) before the server finishes. When the server is finished, it'll return to the client, but the server can't see the client which sent the request to server, at which point, the server will return an exception in log file. The exception is : javax.jms.InvalidDestinationException: Cannot publish to a deleted Destination: temp-queue://ID:PC0092-49463-1344231871819-0:0:9 [^] My question is: what do I need to do in this case? Can I catch or disable this exception? And how can I do it? (Sorry, If my english is not good.)

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• (iPhone) Instruments can't "Attach to Process"

  - by AlexLive

  Actually, I'm using a second generation Ipod Touch. What I'm trying to do is to debug my app on XCode and look for any memory leaks on Instruments at the same time. Is it even possible? Because the "Attach to Process" submenu lists when my app is running (or debugging in this case) but all the items inside this menu are disabled. All I can do is start the app from Instruments but later I come across some bug and I want to see the variables and properties affected. I'm also new to Instruments. Please, could someone give me any advice? Help would be greatly appreciated!

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• Drupal join on taxonomy terms

  - by ciscoheat

  I have a Drupal setup like this: Content type: Apartments Vocabulary: Areas, that can be used with Apartments. Content type: User profile, with a Content Taxonomy Field for Areas so users can select what areas they are interested in. I would like a view that shows all the user profiles that matches the apartments in their area. A "User profile <- Areas <- Apartments" join in other words. I've been mucking around with the views interface for a while but it's not clear to me how the relations can be setup to achieve this. Can someone give me a hint? In case this cannot be easily solved with views, what is a good way of doing it otherwise? Thanks for your help.

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• UIWebViewNavigationTypeLinkClicked event not getting fired for certain links

  - by userlite

  Hi, I am using a UIWebView as an embedded browser within my iphone app. I am using the shouldStartLoadWithRequest function to handle UIWebViewNavigationTypeLinkClicked events for links clicked by a user. It is working as expected for a number of sites, but not for all. For example: when I click on any of the links on website http://www.foxnews.mobi, the UIWebViewNavigationTypeLinkClicked event is not getting fired. Same thing happens for some other sites. I read somewhere that links with blank target do not fire the event, however this is not the cause of the problem in my case. Any help is appreciated. Thanks.

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• Will pool the connection help threading in sqlite (and how)?

  - by mamcx

  I currently use a singleton to acces my database (see related question) but now when try to add some background processing everything fall apart. I read the sqlite docs and found that sqlite could work thread-safe, but each thread must have their own db connection. I try using egodatabase that promise a sqlite wrapper with thread safety but is very buggy, so I return to my old FMDB library I start to see how use it in multi-thread way. Because I have all code with the idea of singleton, change everything will be expensive (and a lot of open/close connections could become slow), so I wonder if, as the sqlite docs hint, build a pooling for each connection will help. If is the case, how make it? How know wich connection get from the pool (because 2 threads can't share the connection)? I wonder if somebody already use sqlite in multu-threading with NSOperation or similar stuff, my searching only return "yeah, its possible" but let the details to my imagination...

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• Confusion regarding laziness

  - by Abhinav Kaushik

  I have a function myLength = foldl (\ x _ -> x + 1) 0 which fails with stack overflow with input around 10^6 elements (myLength [1..1000000] fails). I believe that is due to the thunk build up since when I replace foldl with foldl', it works. So far so good. But now I have another function to reverse a list : myReverse = foldl (\ acc x -> x : acc) [] which uses the lazy version foldl (instead of foldl') When I do myLength . myReverse $ [1.1000000]. This time it works fine. I fail to understand why foldl works for the later case and not for former?

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• What tools are people using to measure SQL Server database performance?

  - by Paul McLoughlin

  I've experimented with a number of techniques for monitoring the health of our SQL Servers, ranging from using the Management Data Warehouse functionality built into SQL Server 2008, through other commercial products such as Confio Ignite 8 and also of course rolling my own solution using perfmon, performance counters and collecting of various information from the dynamic management views and functions. What I am finding is that whilst each of these approaches has its own associated strengths, they all have associated weaknesses too. I feel that to actually get people within the organisation to take the monitoring of SQL Server performance seriously whatever solution we roll out has to be very simple and quick to use, must provide some form of a dashboard, and the act of monitoring must have minimal impact on the production databases (and perhaps even more importantly, it must be possible to prove that this is the case). So I'm interested to hear what others are using for this task? Any recommendations?

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• Custom Lucene Sharding with Hibernate Search

  - by Timo Westkämper

  Has anyone experience with custom Lucene sharding / paritioning using Hibernate Search? The documentation of Hibernate Search says the following about Lucene Sharding : In some cases, it is necessary to split (shard) the indexing data of a given entity type into several Lucene indexes. This solution is not recommended unless there is a pressing need because by default, searches will be slower as all shards have to be opened for a single search. In other words don't do it until you have problems :) Has anyone implemented sharding in such a way for Hibernate Search that also queries can be target to one of the shards? In our case we have Lucene queries that should target only one shard per query.

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• Sum of path products in DAG

  - by Jules

  Suppose we have a DAG with edges labeled with numbers. Define the value of a path as the product of the labels. For each (source,sink)-pair I want to find the sum of the values of all the paths from source to sink. You can do this in polynomial time with dynamic programming, but there are still some choices that can be made in how you decompose the problem. In my case I have one DAG that has to be evaluated repeatedly with different labelings. My question is: for a given DAG, how can we pre-compute a good strategy for computing these values for different labelings repeatedly. It would be nice if there was an algorithm that finds an optimal way, for example a way that minimizes the number of multiplications. But perhaps this is too much to ask, I would be very happy with an algorithm that just gives a good decomposition.

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• Only some windows shell commands work via ruby?

  - by Sanarothe

  Hi. I'm trying to use a script to control my power options since XP doesn't give you an intuitive way to change CPU Frequency options. Here's my script so far: meh = `cmd.exe /C POWERCFG.EXE /QUERY Portable/Laptop` puts "" puts meh case input when 1 then system('cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac NONE') when 2 then system('cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac ADAPTIVE') when 3 then `cmd.exe /C POWERCFG.EXE /CHANGE Portable/Laptop /processor-throttle-ac CONSTANT` end The problem is that the changes simply don't take place. If I run the same commands directly into a cmd.exe prompt, they work. It's very strange, but nothing works after the initial powercfg query. I feel like I'm missing something incredibly obvious. How can I get the above script to run correctly?

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• MIDlet + BlackBerry API = verification error?

  - by Kilnr

  Hi, Is there any way to write a MIDlet, but still use BlackBerry API classes and functions (including the APIs that require code signing)? In particular, I'm trying to use Kuix (http://www.kalmeo.org/projects/kuix). A pure MIDlet + Kuix (so without BlackBerry stuff) works perfectly after I converted the jar/jad to a cod file. As soon as I add BlackBerry API-stuff (CoverageInfo.COVERAGE_DIRECT in this case) I get a verification error when trying to run the cod file: Error starting $name: Module $name has verification error 2410 at offset 9a4f What can I do to solve this?

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• There's a way to avoid AppleStore?

  - by Grassino87

  Hi, i need to develop an iPhone application that is a Client of serverside application. This application is not for customer but for sell agents. I know that if i try to send to Apple to put on Apple Store they reject it because the application have no sense for Apple Store. The company is small so i can't use the Enterprise program. The only way i can use now is to use Ad Hoc mode but in this case if i made an update you need iTunes and i must find a way to avoid this. Thanks for the help.

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• Is it possible to detect a scrollbar release event in GWT?

  - by Keith

  I'm building a GWT app where I want to be able to detect when a user releases a scroll bar on one of my ScrollPanels. My use case is that the horizontal scroll bar represents time. Since it's impossible to represent the full range of scrollable time I want to just represent a small window of time with the scroll bar. When the user moves and releases the scroll bar I want to do a smooth recentering where the new center is the release point. I can work out how to do this by building a custom scroll bar widget, but I wanted to check if I was missing some way to do it using a "native" scroll bar first.

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• Merging columns in a JTable

  - by Harish

  I am working in JTable and I have a requirement like this. Say There are 4 columns namely 10,20,30,40 Now the value usually comes like 10-20 20-30 and 30-40 So it was easy for us to display the name for this range. But recently the values have started to come randomly like 15-25 10-25,25-30 In this case our JTable should dynamically adjust the size of the row such that it represents that range only meaning it should not disturb the existing cells and only rows which diverge from the normal range. TO be more precise I should be able to merge and split cells based on the content of the cell.

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• Monitor what users are doing in an .net Application and trigger application functionality changes.

  - by Jamie Clayton

  I need some suggestions for how to implement a very basic mechanism that logs what multiple users are doing in an application. When another feature is running I then need to change the application, to restrict functionality. Use Case Example User can normaly edit unpaid records. If the application then runs a Payrun process (Long), I need to then change parts of the application to restrict functionality for a short period of time (eg. Make existing unpaid records readonly). Any suggestions on how I can do this in a .net application?

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• android call log like design

  - by Alxandr

  I'm trying to create a design for a list that looks like (and mostly behaves like) the call log, like shown here: I don't need all the design, but what I'm trying to achieve is the two-columned design with the splitter in-between, and the behavior that if I click on the main item (the left part) one thing happens (in this case, you open some details about the call), and if you press the outer right part something else happens (you call the contact). I'm pretty new to android, but I've managed to do most of the designs I wanted so far, so I don't need the entire layout for this one, only the part that does the splitting and the splitter. And if possible it would be nice to know how to map the clicks appropriately, though I think I might be able to find that out by my self.

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• When is a C++ terminate handler the Right Thing(TM)?

  - by Joseph Garvin

  The C++ standard provides the std::set_terminate function which lets you specify what function std::terminate should actually call. std::terminate should only get called in dire circumstances, and sure enough the situations the standard describes for when it's called are dire (e.g. an uncaught exception). When std::terminate does get called the situation seems analagous to being out of memory -- there's not really much you can sensically do. I've read that it can be used to make sure resources are freed -- but for the majority of resources this should be handled automatically by the OS when the process exits (e.g. file handles). Theoretically I can see a case for if say, you needed to send a server a specific message when exiting due to a crash. But the majority of the time the OS handling should be sufficient. When is using a terminate handler the Right Thing(TM)? Update: People interested in what can be done with custom terminate handlers might find this non-portable trick useful.

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• Is this the 'Pythonic' way of doing things?

  - by Sergio Tapia

  This is my first effort on solving the exercise. I gotta say, I'm kind of liking Python. :D # D. verbing # Given a string, if its length is at least 3, # add 'ing' to its end. # Unless it already ends in 'ing', in which case # add 'ly' instead. # If the string length is less than 3, leave it unchanged. # Return the resulting string. def verbing(s): if len(s) >= 3: if s[-3:] == "ing": s += "ly" else: s += "ing" return s else: return s # +++your code here+++ return What do you think I could improve on here?

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