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• Any reason NOT to slap the 'synchronized' keyword everywhere?

  - by unknown

  In my java project, almost every non-static method I've written is synchronized. I've decided to fix up some code today, by removing most of the synchronized keywords. Right there I created several threading issues that took quite a while to fix, with no increase in performance. In the end I reverted everything. I don't see anyone else writing code with "synchronized" everywhere. So is there any reason I shouldn't have "synchronized" everywhere? What if I don't care too much about performance (ie. the method isn't called more than once every few seconds)?

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• construct a unique number for a string in java

  - by praveen

  We have a requirement of reading/writing more than 10 million strings into a file. Also we do not want duplicates in the file. Since the strings would be flushed to a file as soon as they are read we are not maintaining it in memory. We cannot use hashcode because of collisions in the hash code due to which we might miss a string as duplicate. Two other approaches i found in my googling: 1.Use a message digest algorithm like MD5 - but it might be too costly to calculate and store. 2.Use a checksum algorithm. [i am not sure if this produces a unique key for a string- can someone please confirm] Is there any other approach avaiable. Thanks.

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• sending an url but staying on the same page ( php, codeigniter, javascript )

  - by user1776815

  this is my situation. I'm writing an webinterface in codeigniter to send commands to a virtual server. these commands are passed through the browser in an url. example : http://server.com/TgtSendIRCommand?id=UM-02&code=KEY_UP this server then takes action and the web interface refreshes the screenshot. i just want to have a bunch of links in html that send this command to the browser. But if i click the links, the user has to stay on the same page. So the command is sended but there is no other interaction. i am using codeigniter. Any suggestions ?

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• JQuery-code on different content pages

  - by Ockonal

  Hello, I have a site with menu, which reloads content. Content is dynamically loadable, using ajax and php-script. At different content pages I need in different jquery-plugins. But If I'm writing including need plugin directly in some content page, I get a big lags during loading. So, now I'm includgin all plugins into main page... And it's not the best idea... Any suggestion? UPD: I have a div with content. Content is shown with effects (rolling up/down). When part of menu is clicked, I'm sending ajax-responce to the php script, which reads need text from database and returns it to the main page, from which I sent the responce. Than I'm pasting that content into a div and roll id down. So I'll include jquery-plugins in content pages, the animation of rolling will'nt be normal.

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• I want to make a wrapped acces type for certain internals of one of classes and I have some performa

  - by Alex

  I am writing an abstract matrix class (and some concrete subclasses) for use on very differing hardwares/architectures, etc. and I want to write a row and column type that provides a transparent reference to the rows and columns of the matrix. However, I want to tune for performance, so I'd like this class to be essentially a compiler construct. In other words, I'm willing to sacrifice some dev time to making the overhead of these classes as small as possible. I assume all (small) methods would want to be virtual? Keep the structure small? Any other suggestions?

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• php: possible to convert array of numbers to 'from' and 'to' pairs where consecutive?

  - by Haroldo

  I have an array of timestamps referring to the days when a holiday home is booked. each timestamp is a round day. I want to turn this into an array of 'begins' and 'ends' pairs for consecutive dates Are there any php functions I should be aware of for writing this function? Or does anyone have any pointers for this kind of thing? thanks! edit: example array: Array ( [0] => 1273536000 [1] => 1273622400 [2] => 1273708800 [3] => 1273795200 [4] => 1273881600 [5] => 1273968000 [6] => 1274054400 [7] => 1274140800 [8] => 1274227200 ) where a day = 86400 (seconds)

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• not rewriting .asp files using htaccess

  - by user2939099

  I have .asp files re-writing themselves to .php files using htaccess and a rewrite rule on another site. it works fine but I am trying to do the same on my other site with one URL and it doesn't work. both have mod_rewrite enabled and on similar servers. (Apache v3.22.17 rev9999 / PHP v5.4.21) <IfModule mod_rewrite.c> RewriteEngine On RewriteRule ^(.+).(asp)$ $1.php [L] </IfModule> this is the full htaccess code.. can you see anything wrong with this?

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• ScrollBall press events while screen is off on an Android device.

  - by stolksdorf

  I'm writing a quick music player for myself on my Nexus One and really want to add the feature of being able to switch to the next song without removing it from it's case, ie. by pressing the scrollball through the sleeve. I've scoured many resources and... Haven't found a decently easy way to listen to key press events while the screen is off. Can't seem to even get scrollball press events to work. I've tried using a broadcastreciever listening for the Dpad_center intent, but it doesn't seem to function properly. I'm not looking for someone to write the code for me, but if you have successfully done either of these things, any insight on techniques or resources would be amazing. Thanks in advance!

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• A generic Find method to search by Guid type for class implementing IDbSet interface

  - by imak

  I am implementing a FakeDataSet class by implementing IDbSet interface. As part of implementing this interface, I have to implement Find method. All my entity classes has an Guid type Id column. I am trying to implement Find method for this FakeDbSet class but having hard time to write it in a generic way. Below is my attempts for writing this method but since it does not know about Id been Guid type, I am getting compilation error on m.Id call. Any ideas on how this could be accomplished? public class FakeDataSet<T> : IDbSet<T> where T: class, new() { // Other methods for implementing IDbSet interface public T Find(params object[] keyValues) { var keyValue = (Guid)keyValues.FirstOrDefault(); return this.SingleOrDefault(m => m.Id == keyValue); // How can I write this } }

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• Looking for fast "Find in Files" program

  - by Josh McDonald

  I currently have a directory with 98,000 individual archive transaction files. I need to search those files for user input strings and have the option to open the files as it finds them or at the end of the search. I'm using Notepad++ currently and, while functional, it's quite slow. I thought about writing my own, but I am only familiar with .NET and I'm a beginner. Also, I'm not sure how efficient that would be compared to NP++. This tool would be used again and again so the dev time would definitely be worth it if it came to that. Is there some other tool out there that's already developed that would accomplish this?

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• If I write a framework that gets information from the Internet, should I make a degelate or use blocks?

  - by Time Machine

  Say I'm writing a publicly available framework for the Vimeo API. This framework needs to get information from the Internet. Because this can take some time, I need to use threadin to prevent the UI from hanging. Foundation uses delegates for this, like NSURLConnectionDelegate. However, Game Kit uses blocks as callback functions. What is the recommended way of doing this? I know blocks aren't supported in standard GCC versions, but they require less, much less code for the one that uses my framework. Delegates, on the other hand, are real methods and when protocols are used, I'm sure the methods are implemented. Thanks.

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• conditional beginReceive

  - by sbenderli

  I am writing a client program that uses Sockets. I would like the client to receive asyncronously UNLESS it is expecting a response, in which case I would like to receive syncronously. My current problem is that because I have to make a call to socket.BeginReceive which waits until there's data on the buffer, the async call always happens prior to the sync call.. How could I temporarily stop BeginReceive from executing? Is there a way to call EndReceive and then once I am done receiving syncronously, I can continue to receive asnycronously?

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• .NET DB Query Without Allocations?

  - by Michael Covelli

  I have been given the task of re-writing some libraries written in C# so that there are no allocations once startup is completed. I just got to one project that does some DB queries over an OdbcConnection every 30 seconds. I've always just used .ExecuteReader() which creates an OdbcDataReader. Is there any pattern (like the SocketAsyncEventArgs socket pattern) that lets you re-use your own OdbcDataReader? Or some other clever way to avoid allocations? I haven't bothered to learn LINQ since all the dbs at work are Oracle based and the last I checked, there was no official Linq To Oracle provider. But if there's a way to do this in Linq, I could use one of the third-party ones.

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• Swap function for a char*

  - by Martin

  I have the simple function below which swap two characters of an array of characters (s). However, I am getting a "Unhandled exception at 0x01151cd7 in Bla.exe: 0xC0000005: Access violation writing location 0x011557a4." error. The two indexes (left and right) are within the limit of the array. What am I doing wrong? void swap(char* s, int left, int right) { char tmp = s[left]; s[left] = s[right]; s[right] = tmp; } swap("ABC", 0, 1); I am using VS2010 with unmanaged C/C++. Thanks!

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• XML/XSL nub: Is it possible to create an COMPOSITE XML/XSLT document?

  - by jmweekes

  I have just recently (like 2 days) started using XSLT documents with XML. I understand the basics and am able to generate a formatted document using an .XML document that references a separate .XSLT document. My question, as in the subject, is "Is it possible to create a SINGLE, composite document that contains both the XML data and XSLT processing/formatting/styling and displays as formatted HTML?" I am writing a desktop application in which I need to generate a formatted document on the fly from XML stored in the database. I want to do this without creating or referencing any actual physical files. I will generate a text string containing the XML/XSLT document and feed this to a WebBrowser component for formatted display. Hopefully what I want to do doesn't totally go against the whole XML/XSLT methodology. Any information, direction or suggestions will be greatly appreciated.

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• Execute code when Eclipse workbench loads

  - by Krt_Malta

  Hi! I'm writing an Eclipse plug-in and I've bumped into an issue. Amongst others I'm creating a new custom perspective. I need to execute some code when the workbench loads. I'm using a WorkbenchAdvisor and putting the code in the initialize method. However as it is now it's not being called... Apparently I need to call this PlatformUI.createAndRunWorkbench(display, new ApplicationWorkbenchAdvisor(); but I don't know where to put this... I can't put it in the createInitialLayout of the perspective because this is only called when the perspective is created for the first time. Any ideas please? Thanks and regards, Krt_Malta

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• [javascript]Where are all funcitons in IE?

  - by user339865

  If i want to take all functions and variables declared in my program in firefox i just iterate 'window' object. For example if i have var a=function() {}; i can use a(); or window.a(); in firefox, but not in IE. I have function iterating window object and writing all function names declared in program like that: for (smthng in window) { document.write(smthng); } works in FF, in IE there are some stuff but nothing i declare before. Any ideas?

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• Similar Sub-Classes

  - by praks5432

  Lets say I have a class A that is fairly simple like this - public class A{ private int randomField = 0; protected int key; protected double dmg; } Now I want to write a number of sub-classes that inherit the protected fields and only differ based on the initial values that are assigned to those fields - for example, if I wrote two subclasses B and C, the only difference between those two sub-classes would be that the values key and dmg would have different values. They would share a method, set, which would be exactly the same, in that it would affect the same variable. I find when I'm writing these sub-classes I'm repeating myself, as I just change the constructor to set different initial values to key and dmg, and simply copy and paste the set method. Is there a 'good' way to do this?

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• Secure Menu Items Based on User

  - by Mike Wills

  On this winform application I am writing, I want to secure one menu item from most users. It runs a month-end and cannot be easily backed out if accidentally run. The menu option opens up a window to prompt the user for some information before processing. I don't care where exactly I do the check, but I want to be sure only certain users can run this function. A Google search (on my question title above) didn't turn up anything obvious. Can anyone point me in a direction to pick up who is signed into Windows and how to check if they are authorized?

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• What can you do in ::OnInitDialog() Visual Studio 2008 C++

  - by flirishman

  What can or cannot you do in ::OnInitDialog() Visual Studio 2008 C++ I would like to write out some text on the dialog at the dialog startup. If I put the same code in a PUSH-BUTTON OnBnClicked it works. If I put it in the OnInit, it does not give me the text on the screen. I'm assuming at the OnInit, my dialog box is not completely up, so I cannot write on it? CRect drawRect; drawRect.left = 00; // Shifts text to right drawRect.right = 300; drawRect.top = 00; // How Far Down drawRect.bottom = 300; // Clear out any previous name CString strBlank = "Book Name"; SSTextOut(this->GetDC(), strBlank, &drawRect, DT_LEFT); The function I am writing to is described in http://www.codeproject.com/KB/GDI/SSTextOut.aspx

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• ActionScript Custom Class With Return Type?

  - by TheDarkIn1978

  i just know this is a dumb question, so excuse me in advance. i want to essentially classify a simple function in it's own .as file. the function compares integers. but i don't know how to call the class and receive a boolean return. here's my class package { public class CompareInts { public function CompareInts(small:int, big:int) { compare(small, big); } private function compare(small:int, big:int):Boolean { if (small < big) return true; else return false; } } } so now i'd like to write something like this: if (CompareInts(1, 5) == true). or output 'true' by writing trace(CompareInts(1, 5));

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• [javascript]Where are all functions in IE?

  - by user339865

  If i want to take all functions and variables declared in my program in firefox i just iterate 'window' object. For example if i have var a=function() {}; i can use a(); or window.a(); in firefox, but not in IE. I have function iterating window object and writing all function names declared in program like that: for (smthng in window) { document.write(smthng); } works in FF, in IE there are some stuff but nothing i declare before. Any ideas?

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• Removing an element from an array (PHP)

  - by morpheous

  I want to remove an element from a PHP array (and shrink the array size). Just looking at the PHP docs, it seems this can be done using array_slice() and array_merge() so I am guessing (off the top of my head) that some combination of array_merge() and array_slice will work. However, array_slice() requires an index (not a key), so I'm not sure how to quickly cobble these functions together for a solution. Has anyone implemented such a function before?. I'm sure it must be only a few lines long, but I cant somehow get my head around it (its been one of those days) ... Actually, I just came up with this cheesy hack when writing up this question.... function remove_from_array(array $in, value) { return array_diff($in, (array)$value); } too ugly? or will it work (without any shocking side effects)?

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• How to make shell output redirect (>) write while script is still running?

  - by Noio

  I wrote a short script that never terminates. This script continuously generates output that I have to check on every now and then. I'm running it on a lab computer through SSH, and redirecting the output to a file in my public_html folder on that machine. python script.py > ~/public_html/results.txt However, the results don't show up immediately when I refresh the address. The results show up when I terminate the program, but as I said, it doesn't halt by itself. Is that redirect (>) being lazy with with writing? Is there a way to continuously (or with an interval) update the results in the file? Or is it the webserver that doesn't update the file while it is still being written?

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• Php text spinner

  - by Sir Lojik

  Hi, i spent time writing a rss feed aggregator and have come to find out it completely has no impact on seo. infact it could be damaging my website. i cant get rid of it as its a commonly used resource. So was wondering is there any hardcore php text spinner(synonimizer) out there. that way i could server crawlers/spiders with spun text. is this ethical? or would it cause more damage? please i need feedback.

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