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• Does lamda in List.ForEach leads to memory leaks and performance problems ?

  - by Monomachus

  I have a problem which I could solve using something like this sortedElements.ForEach((XElement el) => PrintXElementName(el,i++)); And this means that I have in ForEach a lambda which permits using parameters like int i. I like that way of doing it, but i read somewhere that anonymous methods and delegates with lambda leads to a lot of memory leaks because each time when lambda is executed something is instantiated but is not released. Something like that. Could you please tell me if this is true in this situation and if it is why?

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• Change div backgroung color base on result from servlet using jquery

  - by Both FM

  Java Script Code Snippet $(document).ready(function() { $("#button").click(function(){ $cityName = document.getElementById("name").value; $.post("AddServlet", { name:$cityName }, function(xml) { $("#feedback").html( $("result", xml).text() ); }); }); }); In Servlet String name= request.getParameter("name"); if (name.equals("shahid")) { response.setContentType("text/xml"); out.println("<result>You are shahid</result>"); } else{ response.setContentType("text/xml"); out.println("<result>You are not shahid</result>"); } This is working fine! but I want to change the background color of div (feedback) accordingly , means if condition true, background color should be Green otherwise background color should be Red (else)

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• Looking for design patterns to isolate framework layers from each other

  - by T Reddy

  Hi, I'm wondering if anyone has any experience in "isolating" framework objects from each other (Spring, Hibernate, Struts). I'm beginning to see design "problems" where an object from one framework gets used in another object from a different framework. My fear is we're creating tightly coupled objects. For instance, I have an application where we have a DynaActionForm with several attributes...one of which is a POJO generated by the Hibernate Tools. This POJO gets used everywhere...the JSP populates data to it, the Struts Action sends it down to a Service Layer, the DAO will persist it...ack! Now, imagine that someone decides to do a little refactoring on that POJO...so that means the JSP, Action, Service, DAO all needs to be updated...which is kind of painful...There has got to be a better way?! There's a book called Core J2EE Patterns: Best Practices and Design Strategies (2nd Edition)...is this worth a look? I don't believe it touches on any specific frameworks, but it looks like it might give some insight on how to properly layer the application... Thanks!

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• When to use memberEnd and when navigableOwnedEnd (in Altova notation) in an UML class diagram?

  - by Ivan

  I've download a trial of Altova UModel and am starting using UML. As a practical beginning I am modelling a personal information manager application, which includes a web bookmark managing. A Bookmark can belong to many (or no) Tags at once and a Tag can contain many (or no if all the bookmarks it contained were deleted) bookmarks. The relation has to be both-way navigable - a user has to be able to see all Bookmarks with a particular Tags ans all Tags of a Bookmark. What is the correct UML relation between Bookmark and Tag classes? As far as I understand UML now, it is an Association (not an Aggregation). But for a 2-way navigable many-to-many relation I can specify ends roles as "memberEnd" or "when navigableOwnedEnd", graphically the connection looks the same in both cases (an arrow) (which as I understand means navigability) but a property appears in the class box in case only when "memberEnd" is used. How should I specif it in the model If I mean both-way navigable many-to-many relation there?

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• Missing DLL Problem

  - by Liran

  Hi everyone. I have a C++ native application that was built under VS2005 (sp1),On machine A. (Debug Mode) Now,I need to run this application on a "clean" computer, Clean means it has no VS installed on. When i copy the runtime folder from machine A to the "clean" machine and try to activate the application it demands to reinstall the application. obviously missing DLLs are causing this problem cause on machine A the app works just fine, Is there any "clean" solution for this kind of problem besides gessing which DLLs are missing ? maybe a smart tool or installer that indicates which DLLs are missing at the runtime ? Thanks, Liran

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• Any better algorithm possible here?

  - by Cupidvogel

  I am trying to solve this problem in Python. Noting that only the first kiss requires the alternation, any kiss that is not a part of the chain due to the first kiss can very well have a hug on the 2nd next person, this is the code I have come up with. This is just a simple mathematical calculation, no looping, no iteration, nothing. But still I am getting a timed-out message. Any means to optimize it? import psyco psyco.full() testcase = int(raw_input()) for i in xrange(0,testcase): n = int(raw_input()) if n%2: m = n/2; ans = 2 + 4*(2**m-1); ans = ans%1000000007; print ans else: m = n/2 - 1 ans = 2 + 2**(n/2) + 4*(2**m-1); ans = ans%1000000007 print ans

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• Jquery UI Datepicker Date Range Inline Problem

  - by codeworxx

  Hey Guys, i have a big Problem with jQuery UI Datepicker. I have two Input Fields "From Date" and "To Date". When i choose a From Date - a Daterange of only 5 Days should appear on the "To Date" Picker. I used the Code from "Russ Cam" http://stackoverflow.com/questions/330737/jquery-datepicker-2-inputs-textboxes-and-restricting-range It worked perfect. Now my Problem: I have a second Calendar which is INLINE, means no Input Fields - it's shown directly on the Page - with "From Date" and "To Date". In this Calendar the Script does not work! All Fields in "From Date" and in the "To Date" are available - no Date Range Restrictions or something else. What's wrong here? Can someone give me a hint?

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• Excel - check if row contains ANY value *more than once*

  - by user2536778

  I am doing data analysis and sometimes I need to check and to make sure each row in excel does not have any repeated value. I hope that there is a formula where each time if there's a repeated value in the same row, the value will be highlighted and it doesn't matter what value it is, as long as it's repeated in the same row. I try to search it everywhere but the closest I can find is below question & answer ( which couldn't apply to me as I need a formula that can highlight any value that's repeated and not only zero): I have rows which contain grades for students (numerical values), where the number 0 means they missed a class. I want the row to be highlighted in one color if they have "0" 3 or 4 times, and in another color if they have "0" 5 times or more. =COUNTIF(1:1,0)=5 Anyone can help me? Thanks in advance!

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• Autoupgradeenable property of openfiledialog.

  - by Harikrishna

  I had need of showing open file dialog in winform application. And one property of the file dialog, autoupgradeenabled which I set as a true, which is for updating the open file dialog according to operating system, like if application is running on xp then dialog is displayed different as in wista or window 7. So when I used that property as a true, and once in the machine where there was xp with 2.0 .net framework that open file dialog could not be opened. So I tried by doing it false then also it could not be opened in the machine with the xp and 2.0 framework. Then I tried by commenting that whole line means I removed that property from the code, then I tried and it was fine in xp machine with 2.0 framework. So problem is I cannot understand that why that property is not working by setting it false or true. Because by setting that property is should work in all os with all framework and dialog should be changed according to os. If not,then what is the meaning of that property ?

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• How to thoroughly clean up a ruby on rails project?

  - by hip10

  Hi, I am very new to ruby on rails. I've installed a complicated ruby on rails project via github clone and bundle install, and I was making minor changes to it until it reaches a point whereby it is not stable anymore, sass was throwing strange exceptions, so did other ruby gems. For a rails project, is there a way to clean up the project (aka, remove any "compiled or cached code") and just run again. My alternative now is to go thru github clone and bundle install again, but that means all of my modified changes have to be reapplied again. What is rails equivalent of "make clean" in Java? Is "rake clean" the answer? Do we need to run any bundle commands?

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• OpenGL Performance Questions

  - by Daniel

  This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at Game Development

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• What garbage collection algorithms do all 5 major browsers use?

  - by Martin Wittemann

  I am currently rethinking the object dispose handling of the qooxdoo JavaScript framework. Have a look at the following diagram (A is currently in scope): Let's say we want to delete B. Generally, we cut all reference between all objects. This means we cut connection 1 to 5 in the example. Is this really necessary? As far as I have read hear 1, browsers use the mark-and-sweep algorithm. In that case, we just need to cut reference 1 (connection to the scope) and 5 (connection to the DOM) which could be much faster. But can I be sure that all browsers use the mark-and-sweep algorithm or something similar? 1 http://stackoverflow.com/questions/864516/what-is-javascript-garbage-collection

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• Sometimes Explorer_WindowStateChanged does not fire while opening new tab.

  - by Ramveer Singh

  I am using Explorer_WindowStateChanged to identified tab change event in IE 7 or IE 8. My problem is, When i open any link in new tab (By right click on link and click on open in new tab), then somtimes Explorer_WindowStateChanged event does not fire and i am not able to detect that a new tab has been opened. Explorer_WindowStateChanged event is working fine when i am switching between tab. The problem is only when i am opening new tab and the new opened tab is not active (Means active tab is that where i opened link) Actually i am keeping the count of opened tab. So sometimes 8 tabs are open and my count show that 7 tab are open. Please help me that how can i ensure that whenever a new tab is opening then after setsite() method, Explorer_WindowStateChanged event must fire. Please Help

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• A RAM error of big array

  - by flint

  I have a big file, more than 400M. In that file, there are 13496*13496 number, means 13496 rows and 13496 cols. I want to read them to a array. This is my code: _L1 = [[0 for col in range(13496)] for row in range(13496)] _L1file = open('distanceCMD.function.txt') while (i<13496): print "i="+str(i) _strlf = _L1file.readline() _strlf = _strlf.split('\t') _strlf = _strlf[:-1] _L1[i] = _strlf i += 1 _L1file.close() And this is my error massage: MemoryError: File "D:\research\space-function\ART3.py", line 30, in <module> _strlf = _strlf.split('\t')

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• Trying to find a good javascript function for hmac-sha1

  - by Darxval

  So i have been searching the web for a javascript source for an Hmac-sha1 algorithm. I saw Crypto's but i cant seem to get it to work, mainly because it has no idea what crypto means. (i copied the .js script functions into my script file) http://code.google.com/p/crypto-js/ I have my base64 encoded function already. that i got from here: http://nerds-central.blogspot.com/2007/01/fast-scalable-javascript-and-vbscript.html btw this for a twitter application using the new OAuth system. any help or links to where i can find anything on this would be helpful If you need me to elaborate let me know. thank you!

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• Exception handling in Iterable

  - by Maas

  Is there any way of handling -- and continuing from -- an exception in an iterator while maintaining the foreach syntactic sugar? I've got a parser that iterates over lines in a file, handing back a class-per-line. Occasionally lines will be syntactically bogus, but that doesn't necessarily mean that we shouldn't keep reading the file. My parser implements Iterable, but dealing with the potential exceptions means writing for (Iterator iter = myParser.iterator(); iter.hasNext(); ) { try { MyClass myClass = iter.next(); // .. do stuff .. } catch (Exception e) { // .. do exception stuff .. } } .. nothing wrong with that, but is there any way of getting exception handling on the implicit individual iter.next() calls in the foreach construct?

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• jpa-Primarykey relationship

  - by megala

  Hi created student entity in gogole app engine datastore using JPA. Student---Coding @Entity @Table(name="StudentPersonalDetails", schema="PUBLIC") public class StudentPersonalDetails { @Id @Column(name = "STUDENTNO") private Long stuno; @Basic @Column(name = "STUDENTNAME") private String stuname; public void setStuname(String stuname) { this.stuname = stuname; } public String getStuname() { return stuname; } public void setStuno(Longstuno) { this.stuno = stuno; } public Long getStuno() { return stuno; } public StudentPersonalDetails(Long stuno,String stuname) { this.stuno = stuno; this.stuname = stuname; } } I stored Property value as follows Stuno Stuname 1 a 2 b If i stored Again Stuno No 1 stuname z means it wont allow to insert the record But. It Overwrite the value Stuno Stuname 1 z 2 b How to solve this?

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• Exclusive compute mode with OpenCL+NVidia

  - by lokli

  Hi, I have a question to exclusive compute mode with NVidia+OpenCL. I can set up exclusive compute mode (page 74 from cuda programming guide 3.0) with nvidia-smi on a nvidia-gpu . that means, only one program can compute on gpu. cuda runtime schedules than app automatically. but I have a problem with opencl-programs in this case: if one application runs on a gpu with setted exclusive compute mode and second opencl-program calls clGetDeviceInfo(..., CL_DEVICE_AVAILABLE, ...) with the same GPU is the result == CL_TRUE. After that if opencl-app tries to create a context on this device, than crashes the running app (both). How can i find out an available GPU with OpenCL? Thanks.

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• DATA REQUEST IN SMALLER CHUNKS?

  - by Googler

  Hi folks, I have developed a windows services to retrieve all response data provided by the EPO webservices. While scrapping the data through internet, after few hours i recieve a error message as: Error: ** Please request bibliographic data in smaller chunks.** Here bibliographic data is one kind of the service provided by the EPO webservice. I hope there is no error with my inputs and the service provided. I dont know what this error means. Is it related to the internet connection or with my webservices? can anyone please help me on what this error actually mean?

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• Adding Postgres table cells based on same value

  - by russell kinch

  I have a table called expenses. There are numerous columns but the ones involved in my php page are date, spplierinv, amount. I have created a page that lists all the expenses in a given month and totals it at the end. However, each row has a value, but many rows might be on the same supplier invoice.This means adding each row with the same supplierinv to get a total as per my bank statement. Is there anyway I can get a total for the rows based on the supplierinv. I mean say I have 10 rows. 5 on supplierinv 4, two on supplierinv 5 and 3 on supplierinv 12, how can a get 3 figures (inv 4, 5 and 12) and the grand total at the bottom. Many thanks

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• Forward web request for directory index ('/') to an index.htm page in JBoss 4.0.5

  - by The Pretender

  I am using JBoss 4.0.5.GA to run a set of java applications. One of them is a web frontend, using Spring 1.4. URL mappings are configured in a way that 'fake' pages from request URLs are mapped to controllers. That means that when someone requests /index.htm, there's no actual 'index.htm' on disk, and that request maps to a specific conroller which then renders a jsp view. So the problem is as follows: I need to tell JBoss to somehow forward all requests for directory indices to corresponding 'index.htm' URLs like so: / ? /index.htm; /news/ ? /news/index.htm; /foo/bar/baz/ ? /foo/bar/baz/index.htm and so on. I can't use Tomcat's welcome-file-list feature because it looks for those files on disk, while all 'index.htm's are fake and don't actually exist on disk.

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• switching default keyevents actions after key combinations

  - by liysd

  I need to change default actions of two events. When I press "enter" one action occurs, when I press "shift-enter" another. I need to switch it. I means if I press "enter" than "shift-enter" action occurs. I tried something like this but if doesn't work. f(evt.keyCode == 13) { if(!evt.shiftKey){ evt.preventDefault(); evt.shiftKey = true; var e = jQuery.Event("keydown"); e.which = 13; e.shiftKey = true; $(wym._doc).trigger(e); Is there any way to do it?

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• MySQL enters another value that the one given by PHP

  - by Tristan

  Hello, The big problem : mysql does not stores the information i told him to via PHP Example (this req is an echo just before the query) : INSERT INTO serveur (GSP_nom , IPserv, port, tickrate, membre, nomPays, finContrat, type, jeux, slot, ipClient, email) VALUES ( 'ckras', '88.191.88.57', '37060', '100' , '', 'Allemagne','20110519', '2', '4','99' ,'82.220.201.183','[email protected]'); But on the MySQL i have : 403 ckras 88.191.88.57 32767 100 Allemagne 20110519 1 2010-04-25 00:51:47 2 4 99 82.220.201.183 [email protected] port : 37060 (right value) //// 32767 (MySQL's drug?) Any help would be appreciated, i'm worse than stuck and i'm ** off PS: *There is no trigger on the mysql as far as i know / there is no controll on the port which means that nowhere i modify the "port" value and this script works for 80% of the time ( it seems that as soon as the users enters a port = 30000 it causes that bug), an user first reported to me this error today and the script was running since 3 months* Thanks

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• Return numerical array in python

  - by khan

  Okay..this is kind of an interesting question. I have a php form through which user enters values for x and y like this: X: [1,3,4] Y: [2,4,5] These values are stored into database as varchars. From there, these are called by a python program which is supposed to use them as numerical (numpy) arrays. However, these are called as plain strings, which means that calculation can not be performed over them. Is there a way to convert them into numerical arrays before processing or is there something else which is wrong? Helpp!!

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• how to give language option at installation time of my .net project?

  - by Ashwin

  I created one desktop project in c#. i want to know about how it could be use for different languages. i created resx file for all the forms like that: select particular form goes to the property window set localiztion true select language in which i want to show in particular language. convert all labels text and other functionality in selected language and build it. after building one another resx file created other than default resx. This process is did for all the form. so now each form having to resx file first is hi.resx for hindi and another is default resx. now my qus is that : how to give language selection option at installation time. and when user choose any language then my application is converted in that language that means particular language resx file set life time whenever user uninstall that application.

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