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  • mod_rewrite capturing domain and tld

    - by sameold
    I'm using mod_write to rewrite this www.variabledomain.variableext to http://my.com/variabledomain.variableext Note that variabledomain and variableext are really variable, so I can't hardcode them. I'm not an expert at mod_rewrite, but I thought something like would work, but it isn't. Any ideas what I should be doing instead. RewriteRule ^(.*)\.(.*)\.(.*)$ http://my.com/$2\.$3 [R=301,L]

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  • JSR updates - October 2013

    - by Heather VanCura
    A handful of JSRs have been making  progress in the JCP program--Java SE, Java ME and Java EE JSRs.  More to come in the next few weeks! Highlights and links to JSR material below. JSR 337,  Java SE 8 Release Contents, published an Early Draft Review. JSR 351, Java Identity API, published an Early Draft Review. JSR 360, Connected Limited Device Configuration (CLDC) 8, passed the EC Public Review Ballot with 21 yes votes. JSR 361, Java ME Embedded Profile, passed the EC Public Review Ballot with 20 yes votes. JSR 107, JCACHE-Java Temporary Caching API, published an update to their JSR Community Update Page.  You can find schedule information (plans to submit Proposed Final Draft very soon), Adopt-a-JSR suggestions, and presentation material from JavaOne.

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  • Brief material on C++ object-lifetime management and on passing and returning values/references

    - by dsign
    I was wondering if anybody can point to a post, pdf, or excerpt of a book containing the rules for C++ variable life-times and best practices for passing and returning function parameters. Things like when to pass by value and by reference, how to share ownership, avoid unnecessary copies, etc. This is not for a particular problem of mine, I've been programming in C++ for long enough to know the rules by instinct, but it is something that a lot of newcomers to the language stumble with, and I would be glad to point them to such a thing.

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  • How do I select a field/column from the output of `ls -l`?

    - by soandos
    My goal is deceptively simple (at least to me). I wish to take the output of ls -l or ls -lh and select just one field. I am looking for this to be as bulletproof as possible, by which I mean, assume that filenames can have a variable number of spaces, not everything in the field has the same length, etc. Bonus points for having a script that will take the name of the the field (or even just a field number), and then return the contents of the field. I want to turn into:

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  • Is there any reason in a Java program for a special naming for a function arguments?

    - by gasan
    I'd like to know, why would I want to have a special prefixes for a function arguments, like "p_name", "p_age", "p_sex"? On the one hand it helps to distinguish parameter from local variable or field further in the function body, but would it help? On the other hand, I didn't saw such naming recommendations anywhere including official Java language conventions. Please advise any reasons for using such naming policy

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  • Unintentional run-in with C# thread concurrency

    - by geekrutherford
    For the first time today we began conducting load testing on a ASP.NET application already in production. Obviously you would normally want to load test prior to releasing to a production environment, but that isn't the point here.   We ran a test which simulated 5 users hitting the application doing the same actions simultaneously. The first few pages visited seemed fine and then things just hung for a while before the test failed. While the test was running I was viewing the performance counters on the server noting that the CPU was consistently pegged at 100% until the testing tool gave up.   Fortunately the application logs all exceptions including those unhandled to the database (thanks to log4net). I checked the log and low and behold the error was:   System.ArgumentException: An item with the same key has already been added. (The rest of the stack trace intentionally omitted)   Since the code was running with debug on the line number where the exception occured was also provided. I began inspecting the code and almost immediately it hit me, the section of code responsible for the exception is trying to initialize a static class. My next question was how is this code being hit multiple times when I have a rudimentary check already in place to prevent this kind of thing (i.e. a check on a public variable of the static class before entering the initializing routine). The answer...the check fails because the value is not set before other threads have already made it through.   Not being one who consistently works with threading I wasn't quite sure how to handle this problem. Fortunately a co-worker recalled having to lock a section of code in the past but couldn't recall exactly how. After a quick search on Google the solution is as follows:   Object objLock = new Object(); lock(objLock) { //logic requiring lock }   The lock statement takes an object and tells the .NET runtime that the current thread has exclusive access while the code within brackets is executing. Once the code completes, the lock is released for another thread to utilize.   In my case, I only need to execute the inner code once to initialize my static class. So within the brackets I have a check on a public variable to prevent it from being initialized again.

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  • How often should saving to disk occur in an automatically saving text editor?

    - by lelandmiller
    I am developing a simple text editor and would like the application to save the text automatically. In other words, the user would never have to press a save button. I have seen other applications that do this, and was wondering how often is it safe to write files to disk? From a user experience standpoint, it seems that the more frequently this happens the better, but I am worried about performance and possible disk wear (especially on writes to SSDs). It seems like the operating system disk caching might help avoid these problems, but I also don't know if its safe to rely on that for an application like this. I was planning on writing the whole document to disk at each save, but this just seems terribly inefficient if the OS ends up writing it to disk to frequently, but relying on program unload may lose data in the case of a crash. Does anyone have any experience dealing with this that might be able to help?

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  • How can I create a flexible system for tiling a 2D RPG map?

    - by CptSupermrkt
    Using libgdx here. I've just finished learning some of the basics of creating a 2D environment and using an OrthographicCamera to view it. The tutorials I went through, however, hardcoded their tiled map in, and none made mention of how to do it any other way. By tiled map, I mean like Final Fantasy 1, where the world map is a grid of squares, each with a different texture. So for example, I've got a 6 tile x 6 tile map, using the following code: Array<Tile> tiles = new Array<Tile>(); tiles.add(new Tile(new Vector2(0,5), TileType.FOREST)); tiles.add(new Tile(new Vector2(1,5), TileType.FOREST)); tiles.add(new Tile(new Vector2(2,5), TileType.FOREST)); tiles.add(new Tile(new Vector2(3,5), TileType.GRASS)); tiles.add(new Tile(new Vector2(4,5), TileType.STONE)); tiles.add(new Tile(new Vector2(5,5), TileType.STONE)); //... x5 more times. Given the random nature of the environment, for loops don't really help as I have to start and finish a loop before I was able to do enough to make it worth setting up the loop. I can see how a loop might be helpful for like tiling an ocean or something, but not in the above case. The above code DOES get me my final desired output, however, if I were to decide I wanted to move a piece or swap two pieces out, oh boy, what a nightmare, even with just a 6x6 test piece, much less a 1000x1000 world map. There must be a better way of doing this. Someone on some post somewhere (can't find it now, of course) said to check out MapEditor. Looks legit. The question is, if that is the answer, how can I make something in MapEditor and have the output map plug in to a variable in my code? I need the tiles as objects in my code, because for example, I determine whether or not a tile is can be passed through or collided with based on my TileTyle enum variable. Are there alternative/language "native" (i.e. not using an outside tool) methods to doing this?

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  • Using static in PHP

    - by nischayn22
    I have a few functions in PHP that read data from functions in a class readUsername(int userId){ $reader = getReader(); return $reader->getname(userId); } readUserAddress(){ $reader = getReader(); return $reader->getaddress(userId); } All these make a call to getReader() { require_once("Reader.php"); static $reader = new Reader(); return $reader; } An overview of Reader class Reader{ getname(int id) { //if in-memory cache exists for this id return that //else get from db and cache it } getaddress(int id) { $this->getname(int id); //get address from name here } /*Other stuff*/ } Why is class Reader needed The Reader class does some in-memory caching of user details. So, I need only one object of class Reader and it will cache the user details instead of making multiple db calls. I am using static so that it the object gets created only once. Is this the right approach or should I do something else?

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  • Is it reasonable for REST resources to be singular and plural?

    - by Evan
    I have been wondering if, rather than a more traditional layout like this: api/Products GET // gets product(s) by id PUT // updates product(s) by id DELETE // deletes (product(s) by id POST // creates product(s) Would it be more useful to have a singular and a plural, for example: api/Product GET // gets a product by id PUT // updates a product by id DELETE // deletes a product by id POST // creates a product api/Products GET // gets a collection of products by id PUT // updates a collection of products by id DELETE // deletes a collection of products (not the products themselves) POST // creates a collection of products based on filter parameters passed So, to create a collection of products you might do: POST api/Products {data: filters} // returns api/Products/<id> And then, to reference it, you might do: GET api/Products/<id> // returns array of products In my opinion, the main advantage of doing things this way is that it allows for easy caching of collections of products. One might, for example, put a lifetime of an hour on collections of products, thus drastically reducing the calls on a server. Of course, I currently only see the good side of doing things this way, what's the downside?

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  • Can I copy large files faster without using the file cache?

    - by Veazer
    After adding the preload package, my applications seem to speed up but if I copy a large file, the file cache grows by more than double the size of the file. By transferring a single 3-4 GB virtualbox image or video file to an external drive, this huge cache seems to remove all the preloaded applications from memory, leading to increased load times and general performance drops. Is there a way to copy large, multi-gigabyte files without caching them (i.e. bypassing the file cache)? Or a way to whitelist or blacklist specific folders from being cached?

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  • Heroku augmente son support des technologies Java : couche de mise en cache, serveur Tomcat et plugins pour Eclipse et Atlassian

    Heroku augmente son support des technologies Java Couche de mise en cache, serveur Tomcat et plug-in pour Eclipse et Atlassian Salesforce.com, l'entreprise dirigeante de Heroku, a lancé mercredi une nouvelle variable de sa plateforme, dite "Entreprise for Java", qui supporte un ensemble de technologies et outils nécessaires au développement d'applications Java. [IMG]http://idelways.developpez.com/news/images/heroku-java.png[/IMG] La plateforme Cloud Heroku opère depuis 2007 et a été rachetée en 2010 par le spécialiste mondial des CRM Salesforce.com. Elle permet aux développeurs de construire, déployer et étendre des applications Web en mode PaaS,...

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  • SDL - Getting a single keypress event instead of a keystate?

    - by MrKatSwordfish
    Right now I'm working on a simple SDL project, but I've hit an issue when trying to get a single keypress event to skip past a splash screen. Right now, there are 4 start-up splash screens that I would like to be able to skip with a single keypress (of any key). My issue is that, as of now, if I hold down a key, it skips through each splash screen to the very last one immediately. The splash screens are stored as an array of SDL surfaces which are all loaded at the initialization of the state. I have an variable called currentSplashImage that controls which element of the array is being rendered on the screen. I've set it up so that whenever there's a SDL_KEYDOWN event, it triggers a single incrementation of the currentSplashImage variable. So, I'm really not sure why my code isn't working correctly. For some reason, when I hold down a button, it seems to be treating the held button as a new key press event every time it ticks through the code. Does anyone know how I can go about fixing this issue? [Here's a snippet of code that I've been using...] void SplashScreenState::handleEvents() { SDL_PollEvent( &localEvent ); if ( localEvent.type == SDL_KEYDOWN ) { if ( currentSplashImage < 3 && currentSplashImage >= 0) { currentSplashImage++; } } else if ( localEvent.type == SDL_QUIT ) { smgaEngine.setRunning(false); } } I should also mention that the SDL_Event 'localEvent' is part of the GameState parent class, while this event handling code is part of a SplashScreenState subclass. If anyone knows why this is happening, or if there is any way to improve my code, It'd be helpful to me! :D I'm still a very new programmer, trying to learn. UPDATE: I added a std::cout line to that the code runs multiple times with a single KEYDOWN event. I also tried disabling SDL_EnableKeyRepeat, but it didn't fix the issue. void SplashScreenState::handleEvents() { SDL_PollEvent( &localEvent ); if ( localEvent.type == SDL_KEYDOWN ) { if ( currentSplashImage < 3 && currentSplashImage >= 0) { currentSplashImage++; std::cout << "KEYDOWN.."; //<---- test cout line } } else if ( localEvent.type == SDL_QUIT ) { smgaEngine.setRunning(false); } } This prints out "KEYDOWN..KEYDOWN..KEYDOWN.." in the cout stream when a button is held.

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  • Syncing Files between workgroup server and Ubuntu workstation

    - by dotdawtdaught
    Recently I have decided that I can't make Windows 8 my primary OS on my laptop as it is just too cumbersome to deal with. I am made the switch to Ubuntu and so far so good. Using Windows I have been able to cache folders on my workgroup server using a feature called "Client Side Cache" that allows me to take a copy of my personal files offline while I am in the field, then later I when I return any changes get pushed up to the server and my local cache is refreshed. This feature is completely client driven although characteristics of it (who and what can be cached, and if caching is automatic) can be controlled via a policy assigned as part of a directory membership. Can anyone suggest a linux replacement for this feature? Is there a better way of handling this?

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  • Using Visual Studio 2010s Debugger PIN Feature

    One of the very cool new features in Visual Studio 2010 is the ability to Pin a variable you are watching, right in the place you want to see it.  Its always been a hassle to have to add a Watch and keep track of it among all your other watch variables.  I guess I [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • State Transition Constraints

    Data Validation in a database is a lot more complex than seeing if a string parameter really is an integer. A commercial world is full of complex rules for sequences of procedures, of fixed or variable lifespans, Warranties, commercial offers and bids. All this requires considerable subtlety to prevent bad data getting in, and if it does, locating and fixing the problem. Joe Celko shows how useful a State transition graph can be, and how essential it can become with the time aspect added.

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  • an error in .profile file prevents the system from booting?

    - by nafaa
    I tryied to set the JAVA_HOME environmet variable in the ~/.profile file and I made a mistake JAVA_HOME="/usr/lib/jvm/jdk1.6.0_37" PATH=$JAVA_HOME:PATH the error is in the PATH referencing. I put PATH rather than $PATH. this prevents me from login. I tried to edit the file using the recovery mode but it says that the file system is read only. so any suggestions how to deal with this issue. thanks

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  • Configure DNSMASQ to use /etc/hosts file

    - by casey_miller
    I have installed DNSMASQ but it was not starting as 53 port was busy. I found out that ubuntu already had dnsmasq package and it's working. Now the problem is...I just want to be able to resolve my hosts in /etc/hosts through it i.e: nslookup somehostonlan localhost to be resolved to certain IP taken from /etc/hosts file. but this is not happening. Why? BTW, as the caching DNS server it's working fine. I just want it to resolve hosts from /etc/hosts file that's all

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  • when including a file using php function not work?

    - by John Smiith
    MY PHP FUNCTION IS function functionName() { include($_SERVER['DOCUMENT_ROOT']."/path/file.php"); } Content of File.php is $foo = 'bar'; Calling function (content of file test.php) functionName(); When call function and variable not work echo $foo; <- not works But when adding code below its works (content of file test.php) include($_SERVER['DOCUMENT_ROOT']."/path/file.php"); echo $foo; <- its works

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  • 13.04: update-initramfs works but mkinitramfs fails from APT

    - by Phil2.0
    I'm experiencing a strange thing, I've freshly upgraded from 12.10 to 13.04, Everything is fine except that it can't build the initrd image automatically, it fails and prints out the mkinitramfs's Usage output. I tried to debug the "mkinitramfs" script and it appears the $outfile variable is never set. However, I'm able to produce the ramdisk manually like follow: update-initramfs -c -u 3.0.8-23-generic I tried most of the stuff seen on the net: purge, reinstall but no help but nothing, and I can't use linux-image is marked as "broken" but the kernel exists in /boot.

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  • In C and C++, what methods can prevent accidental use of the assignment(=) where equivalence(==) is needed?

    - by DeveloperDon
    In C and C++, it is very easy to write the following code with a serious error. char responseChar = getchar(); int confirmExit = 'y' == tolower(responseChar); if (confirmExit = 1) { exit(0); } The error is that the if statement should have been: if (confirmExit == 1) As coded, it will exit every time, because the assignment of the confirmExit variable occurs, then confirmExit is used as the result of the expression. Are there good ways to prevent this kind of error?

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  • ASP.NET Performance Framework

    At the start of the year, I finished a 5 part series on ASP.NET performance - focusing on largely generic ways to improve website performance rather than specific ASP.NET performance tricks. The series focused on a number of topics, including merging and shrinking files, using modules to remove unecessary headers and setting caching headers, enabling cache busting and automatically generating cache busted referneces in css, as well as an introduction to nginx. Yesterday I managed to put a number...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • MySQL Prepared Statements to Generate Crosstab SQL

    <b>Database Journal:</b> "MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values."

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  • MySQL Prepared Statements to Generate Crosstab SQL

    MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values.

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  • MySQL Prepared Statements to Generate Crosstab SQL

    MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values.

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