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  • How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

    - by coleifer
    I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite. http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#identicalusage I'm very curious, at a high-level, how this kind of interface might have been architected. For instance: since values are "transparent", how do you efficiently query and sort by value how are limits and offsets performed efficiently on large result sets how would the keys be structured and serialized for good average-case performance

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  • A completely free and open programming language

    - by XGouchet
    With Oracle vs Google trial, it seems that Java is not entirely Open and free (as free software) as I expected. Although there exists completely free/open JVM, it's hard to know what is a copyright infringement with Java, and what is not. So I'd like to know if there is a completely Open and free language with open and free IDE (Eclipse-like) out there, Object Oriented if possible, and able to make window-based applications for the main OSs (Linux, Mac, Windows).

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  • The Hybrid Cloud: Having your Cake

    With a hybrid cloud, can you get the freedom and flexibility of a public cloud with the security and bandwidth of a private cloud? Robert Sheldon explains all the ins and outs. Free ebook "TortoiseSVN and Subversion Cookbook - Oracle Edition"Use these recipes to work better, faster, and do things you never knew you could do with SVN. If you're new to source control, this book provides a concise guide to getting the most out of Subversion. Download it for free.

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  • Les spécifications de Java EE 7 approuvées à l'unanimité par le JCP, IBM émet des réserves sur la modularité de la plate-forme

    Les spécifications de Java EE 7 approuvées à l'unanimité par le Java Community Process Mais IBM émet des réserves sur l'extensibilité et la modularité de la plateforme Mise à jour du 17/03/2011 par Idelways Les spécifications de la prochaine version de Java Entreprise Edition viennent d'être approuvées à l'unanimité par le Java Community Process. Douze des treize organisations impliquées dans les Java Specification Request (JSR), dont Google, la fondation Eclipse, Intel et SAP ont voté « oui sans commentaire » à la proposition d'Oracle. Seul IBM a joint des remarques à son vote positif. IBM ...

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  • MySQL 5.6 : la préversion améliore la disponibilité, les performances et l'administration pour les applications Web, Cloud et embarquées

    MySQL 5.6 : la préversion améliore la disponibilité, les performances et l'administration pour les applications Web, Cloud et embarquées Mise à jour du 12/04/2012, par Hinault Romaric Une nouvelle version intermédiaire de développement (DMR) pour MySQL 5.6 vient d'être publiée par Oracle. La haute disponibilité est renforcée dans cette mouture avec de nouvelles fonctions de réplication basées sur des mécanismes d'autoréparation comme les identifiants globaux de transactions (GTID) pour le suivi de l'avancement de la réplication sur une topologie de réplication et de nouveaux utilitaires de réplication MySQL pour f...

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  • La fondation Eclipse utilise Hudson pour construire les binaires de ses projets, vers la fin de l'autre projet d'usine logicielle Jenkins ?

    Suivant le principe «Eating your own dog food» (le fait d'utiliser ses propres produits afin d'en voir les qualités et les défauts [via Wikipedia]), la fondation Eclipse utilise la version 3.0.0-RC3 d'Hudson pour son instance sandbox. [IMG]http://ftp-developpez.com/gordon-fowler/eclipse_hudson_600px.png[/IMG] La branche 3 d'Hudson désigne le développement de l'usine logicielle effectué dans le giron de la fondation Eclipse. Pour mémoire, après le conflit qui avait opposé la communauté à Oracle,

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  • FreeBSD 8.2 améliore le chiffrement des données et l'intégration du système de fichiers ZFS, FreeBSD 7.4 également disponible

    FreeBSD 8.2 améliore le chiffrement des données Et l'intégration du système de fichiers ZFS, FreeBSD 7.4 également disponible Mise à jour du 28/02/11 Deux nouvelles versions du système d'exploitation UNIX libre FreeBSD viennent de sortir. La première est FreeBSD 8.2. Un e version qui apporte deux nouveautés majeures*: l'amélioration de ZFS et de nouvelles capacités de chiffrement de disques. Pour mémoire, ZFS est un système de fichiers issu de feu OpenSolaris et aujourd'hui sous l'égide de Oracle. A noter, cependant, que ce système particulièrement puissant est ...

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  • NetBeans arrête le support du module Ruby on Rails et concentre ses efforts sur l'intégration de Java SE 7

    NetBeans arrête le support du module Ruby on Rails Et concentre ses efforts sur l'intégration de Java SE 7 NetBeans 7.0, actuellement en bêta et prévu en version définitive pour avril, n'offrira plus de module pour Ruby on Rails. En cause, la faible utilisation de l'IDE d'Oracle par les développeurs Rails et la volonté de l'équipe du projet de se concentrer sur une meilleure intégration de Java 7. La décision est assez peu surprenante. Les développeurs Ruby ont généralement un penchant pour des IDE ...

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  • Mozilla va marquer Java comme dangereux dans Firefox, à la grande colère des développeurs Web

    Mozilla va marquer Java comme dangereux dans Firefox à la grande colère des développeurs WebLe plugin Java, utilisé par de nombreuses applications et sites Web sera marqué comme dangereux à partir de Firefox 24 (le changement n'aurait pas encore été appliqué au navigateur).Java a été en proie à de nombreuses failles de sécurité pendant une longue période. Bien qu'Oracle ait fourni des efforts pour rendre la plateforme plus sûre, chaque mise à jour de sécurité ouvrait la voie à la découverte d'une...

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  • Java EE 7 : les fonctionnalités Cloud reportées, à cause d'un progrès trop lent de la spécification

    Java EE 7 offrira un support étendu du PaaS La plateforme confirme son virage vers le Cloud Mise à jour du 24/06/11, par Hinault Romaric On sait déjà que le prochain Java EE 7 sera très orienté Cloud. La technologie Java pour les applications d'entreprises, dont les spécifications traitent des sujets comme la persistance, le développement et le déploiement d'applications, sera adaptée pour supporter plusieurs modèles de Cloud. Selon les déclarations d'un employé d'Oracle, le prochain JAVA EE aura des capacités permettant une prise en charge du PaaS ((Platform-as-a-service), défini comme la couche intermédiaire en...

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  • Data Mining: Part 14 Export DMX results with Integration Services

    In this chapter we will explain how to work with Data Mining models and the Integration Services. Specifically, we will talk about the Data Mining Query Task in SSIS. Free ebook "TortoiseSVN and Subversion Cookbook - Oracle Edition"Use these recipes to work better, faster, and do things you never knew you could do with SVN. If you're new to source control, this book provides a concise guide to getting the most out of Subversion. Download it for free.

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  • A programmer who doesn't get to program - where to turn? [closed]

    - by Just an Anon
    I'm in my mid 20's, and have been working as a full time programmer / developer for the last ~6 years, with several years of part-time freelancing before this, and three straight years of freelancing in the middle of this short career. I work mostly with PHP and the Drupal framework. By and large, I focus on programming custom pieces of functionality; these, of course, vary greatly from project to project. I've got years of solid experience with OOP (have done some Java & C# years ago, too) including intensive experience with front-end development, and even some design work. I've lead small teams (2-4 people) of developers. And of course, given the large amount of freelancing, I've got decent project- & client-management skills. My problem is staying motivated at any place of employment. In the time mentioned I've worked (full-time) at six local companies. The longest I've stayed at any company was just over a year. I find that I'll get hired and be very excited and motivated for the first few months, but the work quickly gets "stale." By that I mean that the interesting components (ie. the programming) get done, and the rest of the work turns into boring cleanup (move a button, add text, change colours, add a field). I don't get challenged, and I don't feel like I'm learning anything new. This happens repeatedly time and time again, and I always end up leaving for either a new opportunity, or to freelance. I'm wondering if perhaps I've painted myself into a corner with the rather niche work market (although with very high demand and good compensation) and need to explore other career choices. Another possibility is that I may be choosing the wrong places of employment, mostly small agencies, and need to look into working for a larger, more established firm. I find programming, writing code, and architecting solutions very rewarding. When I'm working on an interesting problem I lose all sense of time and 14-16 hours can fly by like minutes. I get the same exciting feeling when I'm doing high-level planning of a complex system, breaking up the work and figuring out how everything will tie-in together. I absolutely hate doing small, "stupid" changes that pose no challenge, yet seem to make up more and more of my work. I want to find a workplace where I will get to work on such tasks, be challenged, and improve in all areas of product development. This maybe a programming job, management, architecture of desktop apps, or may be managing a taco stand on a beach in Mexico - I don't know, and I need some advice and real-world feedback. What are some job areas worth exploring? The requirements are fairly simple: working with computers interacting with others challenging decent pay (I'm making just short of 90k / year with a month of vacation & some benefits, and would like to stay in this range, but am willing to take a temporary cut in pay for a more interesting position) Any advice would be much appreciated!

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  • Is this a valid implementation of the repository pattern?

    - by user1578653
    I've been reading up about the repository pattern, with a view to implementing it in my own application. Almost all examples I've found on the internet use some kind of existing framework rather than showing how to implement it 'from scratch'. Here's my first thoughts of how I might implement it - I was wondering if anyone could advise me on whether this is correct? I have two tables, named CONTAINERS and BITS. Each CONTAINER can contain any number of BITs. I represent them as two classes: class Container{ private $bits; private $id; //...and a property for each column in the table... public function __construct(){ $this->bits = array(); } public function addBit($bit){ $this->bits[] = $bit; } //...getters and setters... } class Bit{ //some properties, methods etc... } Each class will have a property for each column in its respective table. I then have a couple of 'repositories' which handle things to do with saving/retrieving these objects from the database: //repository to control saving/retrieving Containers from the database class ContainerRepository{ //inject the bit repository for use later public function __construct($bitRepo){ $this->bitRepo = $bitRepo; } public function getById($id){ //talk directly to Oracle here to all column data into the object //get all the bits in the container $bits = $this->bitRepo->getByContainerId($id); foreach($bits as $bit){ $container->addBit($bit); } //return an instance of Container } public function persist($container){ //talk directly to Oracle here to save it to the database //if its ID is NULL, create a new container in database, otherwise update the existing one //use BitRepository to save each of the Bits inside the Container $bitRepo = $this->bitRepo; foreach($container->bits as $bit){ $bitRepo->persist($bit); } } } //repository to control saving/retrieving Bits from the database class BitRepository{ public function getById($id){} public function getByContainerId($containerId){} public function persist($bit){} } Therefore, the code I would use to get an instance of Container from the database would be: $bitRepo = new BitRepository(); $containerRepo = new ContainerRepository($bitRepo); $container = $containerRepo->getById($id); Or to create a new one and save to the database: $bitRepo = new BitRepository(); $containerRepo = new ContainerRepository($bitRepo); $container = new Container(); $container->setSomeProperty(1); $bit = new Bit(); $container->addBit($bit); $containerRepo->persist($container); Can someone advise me as to whether I have implemented this pattern correctly? Thanks!

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  • Mozilla va marquer les Applets Java comme dangereux dans Firefox, à la grande colère des développeurs Web

    Mozilla va marquer les Applets Java comme dangereux dans Firefox à la grande colère des développeurs WebLe plugin Java, utilisé par de nombreuses applications et sites Web sera marqué comme dangereux à partir de Firefox 24 (le changement n'aurait pas encore été appliqué au navigateur).Java a été en proie à de nombreuses failles de sécurité pendant une longue période. Bien qu'Oracle ait fourni des efforts pour rendre la plateforme plus sûre, chaque mise à jour de sécurité ouvrait la voie à la découverte...

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  • NetBeans 7.4 : support du JDK 8, nouvelles fonctionnalités HTML5 et développement mobile pour Android et iOS, l'EDI open source sort

    NetBeans 7.4 : support du JDK 8, nouvelles fonctionnalités HTML5, optimisation des performances et développement mobile pour Android et iOS l'EDI open source sortNetBeans, l'environnent de développement polyglotte open source franchi un nouveau cap. Oracle vient de publier la version finale de NetBeans 7.4, qui offre un support amélioré du développement mobile.Cette version apporte comme nouveautés phares :le développement HTML5 pour la création d'applications Android et iOS la prise en charge...

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  • TeamCity stopped working once I added NUnit to the mix

    - by Dave
    I'm struggling a lot trying to get our build server going. I am currently running tests in a Windows XP virtual machine, and have installed TeamCity v5.0.3, build 10821. I am using NUnit v2.5.3. I finished the initial setup with TeamCity without any issues at all, provided that I use the sln2008 build runner that makes the entire process almost brainless. It's really quite nice that way, and very satisfying to see your first successful automated build. Now it's time to kick it up a notch and I wanted to get NUnit working. I keep the NUnit 2.5.3 assemblies in an external libs folder in SVN, so I checked that out onto the test system. I selected NUnit 2.5.3 from the build runner options, as the online instructions had recommended. But when I build, I get the following error: Window1.xaml.cs(14,7): error CS0246: The type or namespace name ‘NUnit’ could not be found (are you missing a using directive or an assembly reference?) Window1.xaml.cs(28,10): error CS0246: The type or namespace name ‘Test’ could not be found (are you missing a using directive or an assembly reference?) Window1.xaml.cs(28,10): error CS0246: The type or namespace name ‘TestAttribute’ could not be found (are you missing a using directive or an assembly reference?) Everything compiles great in the IDE. From finding blog posts and submitting comments, I got some advice and confirmed the following: I have the HintPath value set properly in my project file (points to the external lib) I can also do a full Release and Debug build from the command line using msbuild I have tried do use the NUnit installer so nunit.framework.dll gets registered into the GAC I have changed the build agent's logon account to be a user on the test system, rather than LOCAL SYSTEM. Nothing seems to help... can anyone else here offer me some advice on what to try next?

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  • Update iPhone UIProgressView during NSURLConnection download.

    - by Scott Pendleton
    I am using this code: NSURLConnection *oConnection=[[NSURLConnection alloc] initWithRequest:oRequest delegate:self]; to download a file, and I want to update a progress bar on a subview that I load. For that, I use this code: - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [oReceivedData appendData:data]; float n = oReceivedData.length; float d = self.iTotalSize; NSNumber *oNum = [NSNumber numberWithFloat:n/d]; self.oDPVC.oProgress.progress = [oNum floatValue]; } The subview is oDPVC, and the progress bar on it is oProgress. Setting the progress property does not update the control. From what I have read on the Web, lots of people want to do this and yet there is not a complete, reliable sample. Also, there is much contradictory advice. Some people think that you don't need a separate thread. Some say you need a background thread for the progress update. Some say no, do other things in the background and update the progress on the main thread. I've tried all the advice, and none of it works for me. One more thing, maybe this is a clue. I use this code to load the subview during applicationDidFinishLaunching: self.oDPVC = [[DownloadProgressViewController alloc] initWithNibName:@"DownloadProgressViewController" bundle:nil]; [window addSubview:self.oDPVC.view]; In the XIB file (which I have examined in both Interface Builder and in a text editor) the progress bar is 280 pixels wide. But when the view opens, it has somehow been adjusted to maybe half that width. Also, the background image of the view is default.png. Instead of appearing right on top of the default image, it is shoved up about 10 pixels, leaving a white bar across the bottom of the screen. Maybe that's a separate issue, maybe not.

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  • Regression Testing and Deployment Strategy

    - by user279516
    I'd like some advice on a deployment strategy. If a development team creates an extensive framework, and many (20-30) applications consume it, and the business would like application updates at least every 30 days, what is the best deployment strategy? The reason I ask is that there seems to be a lot of waste (and risk) in using an agile approach of deploying changes monthly, if 90% of the applications don't change. What I mean by this is that the framework can change during the month, and so can a few applications. Because the framework changed, all applications should be regression-tested. If, say, 10 of the applications don't change at all during the year, then those 10 applications are regression-tested EVERY MONTH, when they didn't have any feature changes or hot fixes. They had to be tested simply because the business is rolling updates every month. And the risk that is involved... if a mission-critical application is deployed, that takes a few weeks, and multiple departments, to test, is it realistic to expect to have to constantly regression-test this application? One option is to make any framework updates backward-compatible. While this would mean that applications don't need to change their code, they would still need to be tested because the underlying framework changed. And the risk involved is great; a constantly changing framework (and deploying this framework) means the mission-critical app can never just enjoy the same code base for a long time. These applications share the same database, hence the need for the constant testing. I'm aware of TDD and automated tests, but that doesn't exist at the moment. Any advice?

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  • Method for finding memory leak in large Java heap dumps

    - by Rickard von Essen
    I have to find a memory leak in a Java application. I have some experience with this but would like advice on a methodology/strategy for this. Any reference and advice is welcome. About our situation: Heap dumps are larger than 1 GB We have heap dumps from 5 occasions. We don't have any test case to provoke this. It only happens in the (massive) system test environment after at least a weeks usage. The system is built on a internally developed legacy framework with so many design flaws that they are impossible to count them all. Nobody understands the framework in depth. It has been transfered to one guy in India who barely keeps up with answering e-mails. We have done snapshot heap dumps over time and concluded that there is not a single component increasing over time. It is everything that grows slowly. The above points us in the direction that it is the frameworks homegrown ORM system that increases its usage without limits. (This system maps objects to files?! So not really a ORM) Question: What is the methodology that helped you succeed with hunting down leaks in a enterprise scale application?

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  • JQUERY: Setting Active state on animated menu tabs

    - by Tony
    I have image sprites that use JQuery to set the BG position on mouseover and mouseout events. When I set the active state BG position using JQUERY it works fine until I move my cursor away from the active 'tab' which then fires the mouseout event animation. What I want is the mouseClick event to stop the animation on the active tab but still allow the animation effect to work on the other tabs, and when another tab is clicked for the active state to be removed from the current tab to the new 'active' tab. JQuery $(function(){ /* This script changes main nav links hover state*/ $('.navigation a') .css( {backgroundPosition: "-1px -120px"} ) .mouseover(function(){ $(this).stop().animate({backgroundPosition:"(-1px -240px)"}, {duration:400}) }) .mouseout(function(){ $(this).stop().animate({backgroundPosition:"(-1px -120px)"}, {duration:400, complete:function (){ $(this).css({backgroundPosition: "-1px -120px"}) }}) }) }); $(document).ready(function(){ $("a").click(function(){ $(this).css({backgroundPosition: "-1px -235px"}); }); }); HTML <ul class="navigation"> <li><a href="#index" tabindex="10" title="Home" id="homeButton"></a></li> <li><a href="#about" tabindex="20" title="About us" id="aboutButton"></a></li> <li><a href="#facilities" tabindex="30" title="Our facilities and opening Times" id="facilitiesButton"></a></li> <li><a href="#advice" tabindex="40" title="Advice and useful links" c id="adviceButton"></a></li> <li><a href="#find" tabindex="50" title="How to find Us" id="findButton"></a></li> <li><a href="#contact" tabindex="60" title="Get in touch with us" id="contactButton"></a></li> </ul> You can see what I've got so far here Thanks in advance for any help

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  • Subversion versus Vault

    - by WebDude
    I'm currently reviewing the benefits of moving from SVN to a SourceGear Vault. Has anyone got advice or a link to a detailed comparison between the two? Bear in mind I would have to move my current Source Control system across which works strongly in SVN's favor Here is some info I have found out thus far from my own investigations. I have been taking some time tests between the two and vault seems to perform most operations much faster. Time tests used the same server as the repository, the same workstation client, and the same project. Time Comparisons SVN Add/Commit    12:30 Get Latest Revision    5:35 Tagging/Labelling    0:01 Branching    N/A - I don't think true branching exists in SVN Vault Add/Commit    4:45 Get Latest Revision    0:51 Tagging/Labelling    0:30 Branching    3:23 (can't get this to format correctly) I also found an online source comparing some other points. This is the kind of information i'm looking for. Usage Comparisons Subversion is edit/merge/commit only. Vault allows you to do either edit/merge/commit or checkout/edit/checkin. Vault looks and acts just like VSS, which makes the learning curve effectively zero for VSS users. Vault has a VS plugin, but it only works if you're going to run in checkout-mode. Subversion has clients for pretty much every OS you can imagine; Vault has a GUI client for Windows and a command line client for Mono. Both will support remote work, since both use HTTP as their transport (Subversion uses extended DAV, Vault uses SOAP). Subversion installation, especially w/ Apache, is more complex. Subversion has a lot of third party support. Vault has just a few things. My question Has anyone got advice or a link to a detailed comparison between the two?

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  • Trouble getting started with Spring Roo and GWT

    - by Abdel Olakara
    Hi all, I am trying to get started with SpringRoo and GWT after seeing the keynote.. unfortunately I am stuck at this issue. I successfully created the project using Roo and added the persistence, the entities and when I perform the command "perform package" I get this error: 23/5/10 12:10:13 AM AST: [ERROR] ApplicationEntityTypesProcessor cannot be resolved 23/5/10 12:10:13 AM AST: [ERROR] ApplicationEntityTypesProcessor cannot be resolved to a type 23/5/10 12:10:13 AM AST: [WARN] advice defined in org.springframework.mock.staticmock.AnnotationDrivenStaticEntityMockingControl has not been applied [Xlint:adviceDidNotMatch] 23/5/10 12:10:13 AM AST: [WARN] advice defined in org.springframework.mock.staticmock.AbstractMethodMockingControl has not been applied [Xlint:adviceDidNotMatch] 23/5/10 12:10:13 AM AST: Build errors for helloroo; org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:aspectj-maven-plugin:1.0:compile (default) on project helloroo: Compiler errors : error at import tp.gwt.request.ApplicationEntityTypesProcessor; I see this in the Maven console and cannot complete the build..I know there is some jar missing but how and why? because I downloaded all the latest version including GWT milestone release. Any idea why this error is occurring? How do I resolve this issue? Thanks in Advance, Abdel Olakara

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