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• Searching for cluster computation framework

  - by petkov_d

  I have a library, written in C#, containing one method: Response CalculateSomething(Request); The execution time of this method is relatively large, and there are a lot of responses that should be processed. I want to use a "cluster", spread this DLL to different machines (nodes) in this "cluster" and write some controller that will distribute responses to the nodes. There should be mechanism that perevent losing task because of node crush, load balancing. Can someone suggest framework that addresses this issue? P.S. There is a framework Qizmt written in C# but I think MapReduce is not good for the above scenario

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• Web/HTML: how do referrer work technically?

  - by NoozNooz42

  I don't understand how comes webserver and trackers like Google Analytics are able to track referrals. Is it part of HTTP? Is it some (un)specified behavior of the browsers? Apparently everytime you click on a link on a webpage, the original webpage is passed along the request. What is the exact mechanism behind that? Is it specified by some spec? I've read a few docs and I've played with my own Tomcat server and my own Google Analytics account, but I don't understand how the "magic" happens. Bonus (totally related) question: if, on my own website (served by Tomcat), I put a link to another site, does the other site see my website as the "referrer" without me doing anything special in Tomcat?

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• Calling WebService From Same Project

  - by Yehia A.Salam

  Hi, I'm trying to call an asp.net webservice from the same project it's in: [MethodImpl(MethodImplOptions.Synchronized)] public static void OnFileCreated(object source, FileSystemEventArgs e) { trackdata_analyse rWebAnalyse = new trackdata_analyse(); rWebAnalyse.Analyse(@"pending\" + e.Name, "YOUNIVATE"); } However i always get the following "HttpContext is not available. This class can only be used in the context of an ASP.NET request." when calling Server.MapPath from the webservice: [WebMethod] public int Analyse(string fileName, string PARSING_MODULE){ int nRecords; TrackSession rTrackSession = new TrackSession() ; string filePath = Server.MapPath(@"..\data\") + fileName; do i have to add the WebReference instead, though the webservice is in the same project? Thanks In Advance

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• success, error events aren't working for ajax

  - by Rigo Vides

  Hi everyone, I have the following code: $(document).ready(function(){ $.ajax({ url: "svc/GetTweetsByUser.php", type: "POST", success: function(data) { alert('success'); }, failure: function(){ alert('fail'); }, data: ({twitter_user : 'AdoboHobo'}), dataType: "xml" } );//endof ajax }); I'm kind of starting with web and ajax stuff... this worked perfectly by yesterday. I don't know what is happening now that neither success nor failure events are triggering. I'm shure that the request and response are perfectly working, I checked that with firebug. Does anyone have any ideas for this? Thanks in advance.

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• Strategies to use Database Sequences?

  - by Bruno Brant

  Hello all, I have a high-end architecture which receives many requests every second (in fact, it can receive many requests every millisecond). The architecture is designed so that some controls rely on a certain unique id assigned to each request. To create such UID we use a DB2 Sequence. Right now I already understand that this approach is flawed, since using the database is costly, but it makes sense to do so because this value will also be used to log information on the database. My team has just found out an increase of almost 1000% in elapsed time for each transaction, which we are assuming happened because of the sequence. Now I wonder, using sequences will serialize access to my application? Since they have to guarantee that increments works the way they should, they have to, right? So, are there better strategies when using sequences? Please assume that I have no other way of obtaining a unique id other than relying on the database.

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• Uploading image file from website on yahoo server causes 410 gone error message when trying to acces

  - by creocare

  I have a form that lets users upload a photo of themselves. This seems to work. The photo does exist on the server once uploaded. When I try to access the file I get a "403 forbidden - you don't have permission to access this url on this sever" and also I get "Additionally, a 410 Gone error was encountered while trying to use an ErrorDocument to handle the request." This is the code I have for uploading the image. $target_path = "images/"; $target_path = $target_path . basename( $_FILES['uploadpic']['name']); if(move_uploaded_file($_FILES['uploadpic']['tmp_name'], $target_path)) { echo "The file ". basename( $_FILES['uploadpic']['name']). " has been uploaded"; } else { echo "There was an error uploading the file, please try again!"; }

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• How can I prevent IIS from trying to load a dll?

  - by Abtin Forouzandeh

  My project is a Speech Server application using Windows Workflow. It runs as an app under IIS. It supports a plug-in system. Here is what is happening: Load DLL into memory and set the type on an InvokeWorkflow control. When the InvokeWorkflow control runs, it appears to correctly instantiate the workflow from the loaded assembly - it completes the Initialize method. Everything crashes an burns, the target workflow is never executed. I can resolve this by putting a copy of the DLL in the application's executing directory. The workflow then executes correctly So it appears that IIS is trying to reload the assembly, even though its already in memory. Is there anyway to alter or disable this behavior in IIS? Perhaps a hook I can write that will intercept the request to load the dll and use my own logic to do so?

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• Java servlet and JSP accessing the same session bean

  - by Mykola Golubyev

  Let's say I have simple Login servlet that checks the passed name and creates User object and stores it in a session. User user = new User(); user.setId(name); request.getSession().setAttribute("user", user); response.sendRedirect("index.jsp"); In the index.jsp page I access the user object through jsp:useBean <jsp:useBean id="user" scope="session" class="package.name.User"/> <div class="panel"> Welcome ${user.id} </div> It works so far. The question: is this a valid usage or it is just current implementation uses the same name as the jsp bean id when stores and looks for a bean in a session?

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• Why are error pages ignored in RESTEasy web service running on Tomcat?

  - by Chandru

  I'm developing a REST-ful web service using RESTEasy deployed on Tomcat. I've configured an error page which takes the exception's message and generates an XML based on it when any exception occurs during the request. This works fine for any application generated exceptions. However, if client sends an invalid XML which cannot be unmarshalled correctly, an javax.xml.bind.UnmarshalException is thrown and Tomcat's default error page is used instead of mine. I have configured my error page to the error-code 500 in web.xml. Is using error pages the correct way to handle errors when using RESTEasy or is there an alternative way?

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• jquery validation of controls

  - by Vinodtiru

  Hi , I am looking at validation of some text boxes for somethings like required, minlength, max length, email etc... I am able to get examples that work fine on submit button on page. I want to do this validation on a button click which will only raise a ajax request and not submit of page. On internet all the sample is found was with submit button. Is there a easy way to change this code a little bit o make it work for non submit button click or any new jquery or java plugin to do the same. I am using the jquery.validation.js for now. This works with submit buttons. Any kind of help with suggestion or help is appreciated. Thanks in advance.

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• Route all requests through PageController except existing controllers (Zend Framework)

  - by ChrisRamakers

  For a new CMS i've developed a Pages module that allows me to manage the site's tree structure. Each page is reachable from the url http://www.example.com/pageslug/ where pageslug identifies the page being called. What I want to achieve now is a route that allows me to route all incoming requests to a single PagesController unless it's a request to an existing controller (like images for example). It's easy enough to catch all requests to the Pages Controller but how to exclude existing controllers? This is my module bootstrap. How can i achieve this in the most preferrable way <?php class Default_Bootstrap extends Zend_Application_Module_Bootstrap { protected function _initRoute() { $this->bootstrap('frontController'); /* @var $frontcontroller Zend_Controller_Front */ $frontcontroller = $this->getResource('frontController'); $router = $frontcontroller->getRouter(); $router->addRoute( 'all', new Zend_Controller_Router_Route('*', array('controller' => 'pages', 'action' => 'view') ) ); } }

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• Rails, REST Architecture and HTML 5: Cross domain requests with pre-flight requests

  - by Orion

  While working on a project to make our site HTML 5 friendly, we were eager to embrace the new method for Cross Domain requests (no more posting through hidden iframes!!!). Using the Access Control specification we begin setting up some tests to verify the behaviour of various browsers. The current Rails RESTful architecture relies on the four HTTP verbs: GET, POST, PUT, DELETE. However in the Access Control spec, it dictates that non-simple methods (PUT, DELETE) require a pre-flight request using the HTTP verb OPTIONS. In addition during testing we discovered that Firefox 3.5.8 pre-flight POST requests as well. My question is this. Is anyone aware of any project for the Rails framework working to address the issue? If not, any opinions about the best strategy to support the OPTIONS method, since it has to support the routes for all the POST, PUT, DELETE methods?

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• Access DotNetPanel/WebsitePanel Enterprise Server from outside the loopback address

  - by Ryan French

  Hi Peoples, I am currently investigating integration of DotNetPanel/WebsitePanel with a website that is running ColdFusion. The issue I have come across is that it seems WebsitePanel only allows access to the Enterprise Server (where the web services are that I need access to) when the request is coming from the same physical machine (i.e. on the loop-back address 127.0.0.1). This unfortunately doesnt really work out too well with our current setup as we have our ColdFusion server running on one machine and WebsitePanel running on another. Does anyone have any suggestions as to how we can change this? Currently we are investigating writing a transparent proxy server that will sit on the portal machine and pass requests between the two sites, but that is less than ideal.

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• System.Security.Permissions.SecurityPermission and Reflection on Godaddy

  - by David Murdoch

  I have the following method: public static UserControl LoadControl(string UserControlPath, params object[] constructorParameters) { var p = new Page(); var ctl = p.LoadControl(UserControlPath) as UserControl; // Find the relevant constructor if (ctl != null) { ConstructorInfo constructor = ctl.GetType().BaseType.GetConstructor(constructorParameters.Select(constParam => constParam == null ? "".GetType() : constParam.GetType()).ToArray()); //And then call the relevant constructor if (constructor == null) { throw new MemberAccessException("The requested constructor was not found on : " + ctl.GetType().BaseType.ToString()); } constructor.Invoke(ctl, constructorParameters); } // Finally return the fully initialized UC return ctl; } Which when executed on a Godaddy shared host gives me System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

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• How to Uncheck A radio button

  - by user281867

  Hi, I have two forms, one with a radio button that users must select to edit. [form name="A"] [input type="radio" name="BookItem" value="1" /] [input type="radio" name="BookItem" value="2" /] [input type="radio" name="BookItem" value="3" /] [form] After "BookItem" is selected from form (A) I call the $("#EditFormWrapper").load("callEditData.cfm? ID="+ID); function to load the second form (B) [form id="editForm" name="B"] 2 Hours AM 2 Hours PM 2 Hours AM 2 Hours PM [input type="image" src="images/submit-btn.gif" id="addBTN" name="addBTN" class="buttons" alt="SubmitRrequest" /] [input type="image" src="images/cancel-btn.gif" id="editBTNcancel" name="editBTNcancel" class="buttons" alt="Cancel Request" /] [/form] I want to uncheck the radio button on form (A) when user click on cancel button (editBTNcancel) in form(B). Here s my script: $("#editBTNcancel").live("click", function(event){ event.preventDefault(); $("#EditFormWrapper").slideUp("fast").empty(); //$('.TOR2Hours').removeAttr('checked'); $('.TOR2Hours').attr('checked', false); }); I hope I clearly state my problem, any suggestion would be greatly appreciated!

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• WebClient.UploadFile() throws exception while uploading files to sharepoint

  - by Royson

  In my application i am uploading files to sharepoint 2007. I am using using (WebClient webClient = new WebClient()) { webClient.Credentials = new NetworkCredential(userName, password); webClient.Headers.Add("Content-Type", "application/x-vermeer-urlencoded"); webClient.Headers.Add("X-Vermeer-Content-Type", "application/x-vermeer-urlencoded"); String result = Encoding.UTF8.GetString(webClient.UploadData(webUrl + "/_vti_bin/_vti_aut/author.dll","POST", data.ToArray())); } the code is running successfully..but for some files it throws exception The underlying connection was closed: The connection was closed unexpectedly. at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request) at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data) at System.Net.WebClient.UploadData(String address, String method, Byte[] data) Any Ideas what I have done wrong? I am using VS-2008 2.0

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• ASP.NET MVC ,Maintaining Model State between Ajax requests

  - by Podders

  problem: On first full page request, my controller invokes an applicationServices Layer (Web Service Proxy to my business tier) in order to populate a collection of current services that is stored in my own controller base class property. This is then to be displayed within a view. Everything within the context of that controller has access to this "Services Collection". Now when i make further calls to the same action method via an AJAX Call, i obviously hitt a different instance of that controller meaning my services collection is empty. So other than re-getting the whole collection again, where would i store this collection so it gets persisted between ajax requests? Should i persist it as a seperate DomainModel Object, Session object?....as ViewData is not working for me obv. Excuse my MVC ignorance :) Any help would be greatly appreciated :)

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• Entity Framework Performance Problem

  - by Steve Horn

  I'm hoping that someone can help me understand how to overcome a performance problem I'm running into with the latest version of the Entity Framework. In my test, I created my model from a database consisting of around 80 tables. The problem that I'm running into is that the cost of the very first query I run on a thread is very expensive. If I run without pre-compiling views the first query takes anywhere from 5800 to 6600 milliseconds. If I pre-compile the views (see this article) I can get the initial query cost down to about 2800 to 3200 milliseconds. 3 seconds for each request is still unacceptable for my needs. Subsequent queries are very fast. Can you please help me understand how to eliminate the poor performance of the initial query? I'm using the version of entity framework that ships with Visual Studio 2010 RC.

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• How do I stop displaying a J2ME MIDP application, just before destroying it?

  - by Paul Marshall

  I have a J2ME application where the user has the option to dial a phone number from within the application. This should be the last thing the user does with the app, so it should stop displaying anything. My current code: public void callAndExit() { // use a platform-specific request to dial MyMidletThingummy.getInstance().platformRequest( "tel:" + number ); notifyDestroyed(); } The call works just fine, uses the phone's native way of calling, etc. The problem is that, just after the call completes (whenever the user hangs up), my application displays for a split second before being destroyed. Is there something I can do so that I stop displaying the MIDlet (and, say, show the phone's home screen or whatever else it would rather display), then dial out?

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• SQLCe connection error 0x80004005

  - by nihi_l_ist

  Hello. I get the error when i'm trying to open a database in PocketPC emulator or from the program with connection's Open() method(C#)..Here it is: Description: Internal error: SQL Server Compact made an unsupported request to the host operating system. Can someone explain what can cause this error to appear. The database and application are on Storage Card(shared folder from PC, on which Everyone has read/write permissions)Thank you. FOUND that its because of storing DB on Storage Card(after moving database to 'My Documents' error disappears), but still don't know the reason of error.

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• Highlighting effect to text and/or image similar to be synchronized with audio

  - by Irfan Mulic

  I am looking how to approach following problem: We have application that displays text with audio recorded material. We use Browser Control (Internet Explorer) in Delphi App to do this. We respond to events in Delphi code setting innerHTML for elements if we have to update the style ... Now, request is to add option to dynamically move the cursor or dynamically highlight the words spoken from the paragraph. It doesn't need to match absolutely the exact word spoken so we will have to dynamically update the content of position of highlighted word based on some timer or something (because it is not text to speach). What should be the most practical and easy approach to this kind of problem, all answers are greatly appreciated. Thanks.

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• Page containing Microsoft Chart Control returns Service Unavailable

  - by MHinton

  I have a frustrating problem with an asp.net mvc view containing the Microsoft Chart control. When I request the view containing the control I get the following error. Service Unavailable HTTP Error 503. The service is unavailable. When I run the project under the visual studio 2008 dev server it works fine. When I deploy the project to the staging server I get the error. To make this even more frustrating when I deploy to a different site on the same server under a virtual directory it works. I also get no error messages in the event log or elmah when this happens. Has anyone else encountered this? What did you do to resolve it?

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• feof() in C file handling

  - by Neeraj

  I am reading a binary file byte-by-byte,i need determine that whether or not eof has reached. feof() doesn't works as "eof is set only when a read request for non-existent byte is made". So, I can have my custom check_eof like: if ( fread(&byte,sizeof(byte),1,fp) != 1) { if(feof()) return true; } return false; But the problem is, in case when eof is not reached, my file pointer is moved a byte ahead. So a solution might be to use ftell() and then fseek() to get it to correct position. Another solution might be to buffer the byte ahead in some temporary storage. Any better solutions?

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• Source control products that support linked/shared files?

  - by Ian Boyd

  We're interested in moving from a source control system that supports the concept of shared or linked files. A shared file means: a file modified in one project, is automatically updated changed in every other project that uses that same file. It does this without a developer having to request it, reverse-integrate it, ask for it, or even want it. We're trying to see if any other commonly used source-control systems can meet our needs, and include linked or shared files. My limited research shows that: Team Foundation Server doesn't support sharing files Subversion doesn't support sharing files (including Externals) CVS doesn't support sharing files (including Modules) Anything else? (besides our current source control product, obviously) References Subversion and shared files across repositories/projects? How to share files between CVS projects? Will TFS ever support shared files for projects under source control?

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• How to avoid code duplication for one-off methods with a slightly different signature

  - by Sean

  I am wrapping a number of functions from a vender API in C#. Each of the wrapping functions will fit the pattern: public IEnumerator<IValues> GetAggregateValues(string pointID, DateTime startDate, DateTime endDate, TimeSpan period) { // Validate Data // Break up Requesting Time-Span // Make Requests // Read Results (through another method call } 5 of the 6 requests are aggregate data pulls and have the same signature, so it makes sense to put them in one method and pass the aggregate type to avoid duplication of code. The 6th method however follows the exact same pattern with the same result-set, but is not an aggregate, so no time period is passed to the function (changing the signature). Is there an elegant way to handle this kind of situation without coding a one-off function to handle the non-aggregate request?

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