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WebSocket support on mobile devices

- by Marco W.

For an Android multiplayer game's communication between players I'm using a WebSocket server and TooTallNate's Java library on the client side to enable WebSocket support in the Android app. So just to point it out clearly, WebSocket support in mobile browsers is not important to me. Unfortunately, users report that they're experiencing problems such as connection failures or unreceived messages. Is that a general problem of WebSockets on mobile devices (blocked ports, firewalls, mobile Internet connection) or is that probably a flaw in the client side code? Do you have experience with WebSocket client libraries such as the one above? I've just discovered autobahn.ws for Android - but I don't know if it's worth switching from my current library (see above). What about WAMP? Is WebSocket technology not exactly the adequate solution so that I should use the sub-protocol (?) WAMP?

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Best Practice of Field Collapsing in SOLR 1.4

- by Dominik

I need a way to collapse duplicate (defined in terms of a string field with an id) results in solr. I know that such a feature is comming in the next version (1.5), but I can't wait for that. What would be the best way to remove duplicates using the current stable version 1.4? Given that finding duplicates in my case is really easy (comparison of a string field), should it be a Filter, should I overwrite the existing SearchComponent or write a new Component, or use some external libraries like carrot2? The overall result count should reflect the shortened result.

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java.lang.UnsupportedClassVersionError in eclipse

- by Derek

Hi all, I am not a Java programmer really, so I am posting this question. The exception is being thrown java.lang.UnsupportedClassVersionError in my main class in an eclipse project. If I comment out the imports that this class has, it compiles and runs fine. If I put the imports back in, it does not work. Does this mean that the libraries I am importing were compiled with a newer or older version of java than I have? when i do java -version on the system i get 1.5_07 I could've sworn this was actually working last week, but maybe some setting in eclipse got tweaked? Is the Java Build Path in eclipse what I need to look for to check the JRE and compiler versions?

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parser error in aspx page(.net 2.0) after converting from website to web application

- by persistence911

I have a website I recently converted from website to web application Project . When I compile It compiles Successfuly but when I run the code I get this error Parser Error Message: Could not load type 'DApplause.Logon'. Source Error: Line 1: <%@ Page Language="vb" AutoEventWireup="true" CodeBehind ="Logon.aspx.vb" inherits="DApplause.Logon"%> Line 2: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> Line 3: <HTML> Source File: /Shared/LogOn.aspx Line: 1 -------------------------------------------------------------------------------- Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053 I have tried to resolve this error for like a day now. I am currently running with the internal web server of VS 2005 sp1. I have the Sain.dll in my bin folder cuase the assembly name use is sain and Root Namespace is DApplause . Please I need urgent help.

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Partial Git deployment strategy?

- by MatW

I need to setup a Kohana dev environment that allows me to make full use of shared module / system classes across separate applications. Each application typically belonging to a different client. I use Git for source control, but am struggling to come up with a clean deployment method that will allow me to pull only those parts of the dev environment specific to a client / app down into that client's production environment (assuming that the client's production environment will have Git installed). Dev enviroment: - kohana - applications - clientapp1 - clientapp2 - modules - public_html - clientapp1 - clientapp2 - system - 3.0.1 - 3.0.5 Client 1's production environment: - / - applications - clientapp1 - modules - public_html - client_app1 - system - 3.0.5 Naturally, I want to have total control over each client "sub repo" as if it were an independent repo (in terms of gitignore, etc). I have seen topics that cover Git's sparse checkout feature, but it seems like it may cause a few problems down the line from a maintenance point of view, and I don't like the idea of the entire repo's metadata existing in client's production environment repo. As you can probably tell, I'm not exactly a Git poweruser, so any suggestions / wisdom are very welcome!

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Working with the Objective-C/Cocoa flat namespace

- by Stephen Blinkhorn

I've not found anything that addresses my specific name space question as yet. I am working on some AudioUnit plug-ins featuring Cocoa based GUIs. The plug-ins use a common library of user interface classes (sliders, buttons etc) which are simply added to each Xcode project. When I recompile and distribute updates it is pretty much guaranteed that at least one user interface class will have been updated since the last release. If the user launches an older plug-in before an updated plug-in then the old Cocoa classes are already loaded into the run time and the plug-in attempts to use the older implementations - often resulting in a failure one way or another. I know frameworks are the intended solution but the overhead and backwards compatibility issues are not ideal. I prefix all class names where possible but what options do I have to ensure that each plug-in contains unique class names for the shared user interface classes?

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Where to start with Google Reader as an API?

- by EAMann

I want to build a widget for WordPress that simultaneously displays my latest Google Reader items on the front page and allows for management from behind the WordPress dashboard. I can already add my "shared" items using code I've found in various Google searches, but that's not exactly what I'm looking for. I like the functionality of the Google Reader widget in iGoogle, and I want to replicate that on the WordPress dashboard and build a read-only version for the WordPress front-end. Where do I start in the API (public or 'unofficial') to get this built?

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deriving activity diagram-based GUIs and CRUD them with a DB?

- by Xin Tanaka

i received a big book full of processes. i was thinking about the end user (they will be lawyers) and decided the best GUI would be showing activity diagrams or business processes. It reminded me Quickbooks and how non-accountants can successfully use it and understand accounting processes. i began doing research before sending my project to a bunch of programmers: is there some open source solution? can i use MS Visio libraries? which UML tool is programable? what about Eclipse and its modeling tools? etc etc the key points here are: relationships between events, artifacts, actors, etc should be stored in a database. processes or steps in a process should be easily modified by updating the database do this sounds too crazy? (should I explain a bit more why it must be programmed this way?)

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ASP.NET MVC - ASPX with non-default constructor

- by bh213

Is it possible for a ASPX view (in ASP.NET MVC) to have non-default constructor AND use this constructor when creating this view? Example - Page will inherit from this class: public class ViewPageWithHelper<TModel> : System.Web.Mvc.ViewPage<TModel> where TModel : class { public ViewPageWithHelper(Helpers helpers) { Helpers = helpers; } protected Helpers Helpers { get; private set; } } ASPX view: <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="MyInjectedViewPage<MyModel>" %> <% Helpers.XXXX %> Now, I'd like to inject Helpers into view somehow - automatically. Ideas?

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search paths where one native library depends on another

- by carneades

I'm using JNA and Java but I think this question affects any native-to-nonnative bridge. I have a Java application which relies on lib1.dylib, and lib1.dylib relies on lib2.dylib. I want to put everything inside of my .app file on Mac. I can easily put lib1.dylib inside and set java.classpath (or NativeLibrary.addSearchPath()) to tell the JVM where to find lib1.dylib. The trouble is, I don't know how to communicate that lib1.dylib's dependencies are also in the location I provided. The result is that lib1 is loaded fine, but then lib2 can't be found since it's not in the operating system's library path. Anyone know how I can overcome this problem? I imagine it must come up plenty in big projects with large numbers of shared libraries.

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Installing CXF with Eclipse 3.5

- by shinynewbike

As per http://help.eclipse.org/helios/topic/org.eclipse.jst.ws.cxf.doc.user/reference/preferences.html The CXF 2.x preferences can be accessed via Window > Preferences... > Web Services > CXF 2.x Preferences from the top level menu. but I dont see the option CXF 2.x Preferences under Web Services, though I have chosen JavaEE perspective. any ideas how to enable this? Sorry for such a simple question. I also cannot do not see CXF as a Project Facet as per http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jst.ws.jaxws.doc.user/gettingstarted/requirements.html I know this is something to do with getting Eclipse aware of CXF libraries, but cant find the tutorial for this.

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log4j: Change format of loggers configured in another library.

- by Ignacio Thayer

Using clojure, I've been able to successfully setup log4j very simply by using this log4j.properties file, and including log4j in my classpath. # BEGIN log4j.properties log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout log4j.appender.STDOUT.layout.ConversionPattern=%d{MMdd HHmmss SSS} %5p %c [%t] %m\n log4j.rootLogger=DEBUG, STDOUT Then after :use'ing clojure.contrib.logging, I'm able to print a statement with the desired formatting as expected like so: (info "About to print this") (debug "This is debug-level") My question is how to achieve a consistent formatting for logging statements made from loggers configured in other libraries. I thought I could find existing loggers using org.apache.log4j.LogManager.getCurrentLoggers() and change the PatternLayouts there, but I'm not able to iterate over that enumeration in clojure, as I get the following error: Dont know how to create ISeq from: java.util.Vector$1 I assume this is possible somehow, and probably very simply. How? Thanks much.

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SQL Server 2008 log size management problems

- by b0x0rz

I'm trying to shrink the log of a database AND set the recovery to simple, but always there is an error, whatever i try. USE 4_o5; GO ALTER DATABASE 4_o5 SET RECOVERY SIMPLE; GO DBCC SHRINKFILE (4_o5_log, 10); GO the output of sp_helpfile says that log file is located under (hosted solution): I:\dataroot\4_o5_log.LDF please help me perform this operation as the log file got large when importing a lot of data and now this info is no longer needed, have multiple (lots of) backups since then. the exact error message when performing the query above is: incorrect syntax near '4'. RECOVERY is not a recognized SET option. incorrect syntax near _5_log'. i am using visual studio 2010 (also have SQL Server Express installed locally, SQL Server 2008 proper installed at provider (shared)) thnx a lot

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What are the typical reasons Javascript developed on Firefox fails on IE?

- by karlthorwald

I developed some javascript enhanced pages that run fine on recent Firefox and Safari. I missed to check in Internet Explorer, and now I find the pages don't work on IE 6 and 7 (so far). The scripts are somehow not executed, the pages show as if javascript wasn't there, although some javascript is executed. I am using own libraries with dom manipulation, from YUI 2 I use YUI-Loader and the XML-Http-Request, and on one page I use "psupload", which depends on JQuery. I am installing Microsoft Script Editor from Office XP and will now debug. I will also write specific tests now. What are the typical failing points of IE? What direction I can keep my eyes open. I found this page, which shows some differences: http://www.quirksmode.org/compatibility.html Can you from your experience name some typical things I should look for first? I will also ask more questions here for specific tasks later, but for now I am interested in your experience why IE usually fails on scripts that run fine in Firefox

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Why element creation requires the document object in DOM?

- by maayank

As noted by others, in Java, with the default W3C DOM libraries, one is required to use the Document object a factory to elements, i.e.: import org.w3c.dom.Document; import org.w3c.dom.Element; Document d; Element e; e = d.createElement("tag"); Why is that necessary? Why conceptually a method can't create an XML element without knowing all of the target document? Why I can't just instantiate using 'new' or something to that effect?

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What interprocess locking calls should I monitor?

- by Matt Joiner

I'm monitoring a process with strace/ltrace in the hope to find and intercept a call that checks, and potentially activates some kind of globally shared lock. While I've dealt with and read about several forms of interprocess locking on Linux before, I'm drawing a blank on what to calls to look for. Currently my only suspect is futex() which comes up very early on in the process' execution. Update0 There is some confusion about what I'm after. I'm monitoring an existing process for calls to persistent interprocess memory or equivalent. I'd like to know what system and library calls to look for. I have no intention call these myself, so naturally futex() will come up, I'm sure many libraries will implement their locking calls in terms of this, etc. Update1 I'd like a list of function names or a link to documentation, that I should monitor at the ltrace and strace levels (and specifying which). Any other good advice about how to track and locate the global lock in mind would be great.

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Does Seaside scale?

- by Richard Durr

Seaside is known as "the heretical web framework". One of the points that make it heretical is that it has much shared state. That however is something which, in my current understanding, hinders easy scaling. Ruby on rails on the other hand shares as less state as possible. It has been known to scale pretty well, even if it is dog slow compared to modern smalltalk vms. flickr uses php and has scaled to an extremly big infrastructure... So has anybody some experience in the scaling of Seaside?

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Possible to distribute an MPI (C++) program accross the internet rather than within a LAN cluster?

- by Ben

Hi there, I've written some MPI code which works flawlessly on large clusters. Each node in the cluster has the same cpu architecture and has access to a networked (i.e. 'common') file system (so that each node can excecute the actual binary). But consider this scenario: I have a machine in my office with a dual core processor (intel). I have a machine at home with a dual core processor (amd). Both machines run linux, and both machines can successfully compile and run the MPI code locally (i.e. using 2 cores). Now, is it possible to link the two machines together via MPI, so that I can utilise all 4 cores, bearing in mind the different architectures, and bearing in mind the fact that there are no shared (networked) filesystems? If so, how? Thanks, Ben.

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Create slide-in notifications à la Outlook in Windows with .NET

- by Draak

I am using .NET and am creating a desktop app/service that will display notifications in the corner of my Desktop when certain events are triggered. I don't want to use a regular Message Box b/c that would be too intrusive. The notifications would slide into view and then fade out after a few seconds. I am thinking of something that will act very much like the Outlook alerts that one gets when a new message arrives. The question is: Should I use WPF for this? I've never done anything with WPF but will happily try it if that's best means to the end. Is there a way to accomplish this with regular .NET libraries?

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Perl : how to interrupt/resume loop by user hitting a key?

- by Michael Mao

Hi all: This is for debugging purpose. I've got a for loop that generates some output to Cygwin bash's CLI. I know that I can redirect outputs to text files and use Perl or even just a normal text editor to inspect the values printed out for a particular iteration, just feel that a bit painful. What I am now thinking is, to place a special subroutine inside the for loop, so that it would be "interrupted" at the beginning of each iteration, and Perl script should only resume to run after user/programmer hits a key(the Enter Key from keyboard?) In this way I can directly inspect the values printed out during each iteration. Is there a simple way to do this, without using additional libraries/CPAN ? Many thanks to the hints/suggestions in advance.

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How do I programmatically translate a LINQ query to readable English text that correctly describes t

- by eniac

I am working on a project that uses Albahari's PredicateBuilder library http://www.albahari.com/nutshell/ to create a linq expression dynamically at run time. I would like to find a way to translate this dynamically created linq predicate of type Expression<Func<T, bool>> into a readable english statement at runtime. I'll give a statically created linq statement as an example: from p in Purchases select p where p.Price 100 && p.Description != "Bike". For this linq statement I would want to dynamically generate at runtime an english description along the lines of: "You are searching for purchases where the price is greater than 100 and the description is not bike". Are there any libraries that already exist which accomplish this goal, keep in mind I am using PredicateBuilder to dynamically generate the where predicate. If no solution exists how would you go about building a solution? Thanks!

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trouble accessing localhost from ie7 running on parallels (win xp) on mac os x

- by Karl R

I'm running the app engine devserver on localhost:8080, and want to access it from ie7 running on parallels. I've tried all of the tips here: http://stackoverflow.com/questions/61449/how-do-i-access-the-host-from-vmware-fusion And they seem like they should work, particularly accessing via the gateway ip address. I've also sudo ipfw add allow tcp from 8080 to 8089 for good measure. Still no dice. I can access the external internet from ie7. The connection settings on parallels are set to 'Shared networking'. I'm out of ideas.

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COMET chat application - IIS7 slows down over time

- by Yaron

I have built a chat application which uses this code to push messages to clients (web pages) and to monitor online users and their information. Basically, the code creates and manages a custom thread pool for maintaining the list of connected users & their state. The application was hosted on a shared hosting account (IIS6), and worked fine. After moving the site (ASP.Net App) to a dedicated virtual server it seems I have a problem where IIS7 gets slower and slower as time passes, and my only "solution" is to restart IIS. I am trying to look at the performance counters and have do idea on which one to look.

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how to run existing symfony 1.4.18 project in localhost

- by nickleefly

I have all the symfony 1.4.18 source file in a folder called symfony. And I have the database. under this symfony folder it has apps, cache, config, data, lib, log, plugins, test, web, .gitignore, symfony what all i need to do to make it work in another shared host server? how can i make it run in localhost ? the config file is the following Under the config folder, vhost.conf file DocumentRoot /var/www/vhosts/example.com/httpdocs/web <Directory /var/www/vhosts/example.com/httpdocs/web> Options +FollowSymlinks php_admin_value open_basedir "/var/www/vhosts/example.com/httpdocs:/tmp:/usr/local/php:/usr/share/pear" </Directory> properties.ini file [prod] host=youripaddress port=22 user=yourusername dir=/var/www/vhosts/example.com/httpdocs/ type=rsync password=yourpassword databases.yml all: doctrine: class: sfDoctrineDatabase param: dsn: 'mysql:host=localhost;dbname=yourdbname' username: yourdbusername password: yourdbpassword attributes: default_table_type: InnoDB default_table_collate: utf8_unicode_ci default_table_charset: utf8 use_dql_callbacks: true

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Interface(s) inheriting other interface(s) in WCF services.

- by avance70

In my solution there's a few WCF services, each of them implementing it's own callback interface. Let's say they are called: Subscribe1, with ISubscribe1 and ICallback1, etc. It happens there are a few methods shared among ICallbacks, so I made a following interface: interface ICallback { [OperationContract] CommonlyUsedMethod(); } and i inherited it in all: ICallback1 : ICallback, ICallback2 : ICallback, etc. And deleted the CommonlyUsedMethod() from all callback interfaces. Now, on the service-side code, everything compiles fine and services can start working as usual. But, when I updated the service references for the client, CommonlyUsedMethod() dissapeared from the reference.cs file (the ISubscribeCallback part), and could no longer be used to send data to back to the client.

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