http://blog.gmane.org/gmane.comp.java.prevayler hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.java.prevayler/3687 <pre>This is me thinking out loud. It must be the fifth time I bring this up here, and I still haven't done anything about but to complain about it. I didn't even get in touch with the people previously recommended here that might have good ideas regarding to how to solve it. Serialization is terrible slow. This one application of mine contains some 12GB heap worth of domain data. Due to the complexity of my domain model and the amount of data it contains now I'm starting to hit stack overflows both while marshalling and unmarshalling unless I increase my -Xss. Given the amout of threads I usually run this is not a good solution for me. Thus in deployed environment I don't use snapshots at all, and since I have loads of changes to the persistent data every second the journals grows huge. It can take an hour to restart. Theoretically this means that in a year from now it can take me days to load the journals. Generally speaking this is not a problem, there are many ways around this such as starting the new </pre> Karl Wettin 2012-02-23T06:09:54 http://comments.gmane.org/gmane.comp.java.prevayler/3669 <pre>Howdy folks, Justin: Thanks for the research links in your reply a while back. We're working on a server product with support for mirroring so they came in handy. 'Write-ahead logging' was a good search phrase, and I had some success with "In-Memory Database Systems (IMDSs)". Not much recent work and mostly from an operational perspective dealing with issues like reliability and performance. What drives me is software development productivity. We initiated a research project yesterday (bachelor level) aiming to compare two implementations of the same application, one using a traditional rdbms approach and one using #liveDB. Webinar info appended: From: Chris Mureen [mailto:info&lt; at &gt;mcobject.com] Sent: den 8 februari 2012 23:26 To: Robert Friberg Subject: In-memory databases vs. caching, RAM-disks &amp; SSDs Hi Robert, Managing data on disk can add intolerable latency to applications. In-Memory Database Systems (IMDSs) offer a solution based on fast, all-in-memory data storage. But database caching, RAM-disks </pre> Robert Friberg 2012-02-09T08:31:27 http://comments.gmane.org/gmane.comp.java.prevayler/3667 <pre>http://aow.xosfere.com/wp-content/plugins/gooddeal.htm------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2_______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Alex Rodrigues 2012-01-27T15:28:34 http://comments.gmane.org/gmane.comp.java.prevayler/3662 <pre>I just managed to compress a GZIPSerializer built journal from 70MB to 5MB using gzip the.journal. GZIPSerializer deflates each instance with a new header. This means that snapshots are compressed fully while journals is far from it. I'm starting to think that compression is something that should be implemented in DurableOutputStream. What do you say? karl ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Karl Wettin 2012-01-17T18:27:39 http://comments.gmane.org/gmane.comp.java.prevayler/3660 <pre>Hi all, Recovering slowly from a demonic case of the flue here... on top of that I'm teaching a VB.NET class later this week. Anyone know of any kind of research being done on prevalance? Past or present? I haven't been able to find anything of significance. Robert Friberg 0733-839080 http://livedb.devrex.se&lt;http://livedb.devrex.se/&gt; http://livedomain.codeplex.com&lt;http://livedomain.codeplex.com/&gt; http://devrex.se&lt;http://devrex.se/&gt; http://www.linkedin.com/in/robertfriberg ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox_______________________________________________ To unsubscribe go to the end of this page: http</pre> Robert Friberg 2012-01-09T20:30:24 http://comments.gmane.org/gmane.comp.java.prevayler/3660 <pre>Hi all, Recovering slowly from a demonic case of the flue here... on top of that I'm teaching a VB.NET class later this week. Anyone know of any kind of research being done on prevalance? Past or present? I haven't been able to find anything of significance. Robert Friberg 0733-839080 http://livedb.devrex.se&lt;http://livedb.devrex.se/&gt; http://livedomain.codeplex.com&lt;http://livedomain.codeplex.com/&gt; http://devrex.se&lt;http://devrex.se/&gt; http://www.linkedin.com/in/robertfriberg ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox_______________________________________________ To unsubscribe go to the end of this page: http</pre> Robert Friberg 2012-01-09T20:30:24 http://comments.gmane.org/gmane.comp.java.prevayler/3653 <pre>I'll be presenting at one of sweden's largest developer conferences in may: http://devsum.se/talare/robert-friberg/ Robert Friberg +46733839080 Sent from my iPad ------------------------------------------------------------------------------ Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Robert Friberg 2011-12-19T23:39:11 http://comments.gmane.org/gmane.comp.java.prevayler/3652 <pre>Karl, wouldn't you like to add that? You have access to the prevayler-site repository. Klaus ------------------------------------------------------------------------------ Learn Windows Azure Live! Tuesday, Dec 13, 2011 Microsoft is holding a special Learn Windows Azure training event for developers. It will provide a great way to learn Windows Azure and what it provides. You can attend the event by watching it streamed LIVE online. Learn more at http://p.sf.net/sfu/ms-windowsazure _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Klaus Wuestefeld 2011-12-17T07:01:00 http://comments.gmane.org/gmane.comp.java.prevayler/3648 <pre>That's what it sounds like to me. http://youtu.be/E1pMI6JYkzM karl------------------------------------------------------------------------------ Cloud Services Checklist: Pricing and Packaging Optimization This white paper is intended to serve as a reference, checklist and point of discussion for anyone considering optimizing the pricing and packaging model of a cloud services business. Read Now! http://www.accelacomm.com/jaw/sfnl/114/51491232/_______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Karl Wettin 2011-12-08T15:31:05 http://comments.gmane.org/gmane.comp.java.prevayler/3644 <pre> Here is a blog entry about relational support and crud using #liveDB http://bit.ly/vFXJYR Robert Friberg 0733-839080 http://livedb.devrex.se http://livedomain.codeplex.com http://devrex.se http://www.linkedin.com/in/robertfriberg ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Robert Friberg 2011-11-24T13:06:24 http://comments.gmane.org/gmane.comp.java.prevayler/3641 <pre>Howdy folks, #liveDB is a .NET prevalence engine hosted on codeplex. Release notes here: http://bit.ly/rB3IEJ Robert Friberg 0733-839080 http://livedb.devrex.se http://livedomain.codeplex.com http://devrex.se ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Robert Friberg 2011-11-23T00:25:06 http://comments.gmane.org/gmane.comp.java.prevayler/3639 <pre>-Clarified and simplified Transaction javadoc. Please review, be brutal. reject if not satisfied. -Fixed my own mistake of accidentally loosening of "Serializable" requirement from createPrevayler methods. -Javadoc type &lt; at &gt;params to explain "P" and "R" on the front-end classes -Fixed some of my own previous javadoc wording and presentation mistakes -Other javadoc neatness things. -Fixed my own mistake of naming direct transaction variable just "_transaction", renamed it to more appropriate "_directTransaction". ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/pre</pre> Naveen Chawla 2011-11-19T09:24:18 http://comments.gmane.org/gmane.comp.java.prevayler/3638 <pre>I was thinking primarily of Violin Memory http://www.violin-memory.com/products/ But at closer look seems like I was mistaken, their technology is based on flash disks, although this page seems to say otherwise: http://www.violin-memory.com/technology/violin-switched-memory/ After a bit of binging I came across this Cisco Extended Memory Technology http://www.cisco.com/en/US/prod/collateral/ps10265/ps10280/ps10300/white_paper_c11-525300.pdf Here's another vendor of rackmounted solid state disk modules based on RAM http://www.ramsan.com/products/rackmount-ram-storage/ramsan-440 And some hype to go with it http://news.techworld.com/storage/1176/us-govt-buys-worlds-biggest-ram-disk/ -----Original Message----- From: Klaus Wuestefeld [mailto:mail&lt; at &gt;klaus.pro] Sent: den 17 november 2011 14:00 To: Open discussion about the Prevayler project. Subject: Re: [Prevayler-discussion] Imagine if Prevayler could transparently use disk... Hi Robert, could you send a few links of such companies? ---------------------</pre> Robert Friberg 2011-11-17T16:50:40 http://comments.gmane.org/gmane.comp.java.prevayler/3632 <pre>In fact, it looks like bytecode instrumentation can allow .journal files to be written from there, so a future version of Prevayler might allow you never have to stray from your original object. i.e. one line e.g. Prevayler.prevail(myObject); recovers/persists to/from that object, nothing else necessary. If possible and combined with the disk thing it'll be the ultimate Java persistence engine by far in every situation (only surpassable if Oracle makes it native to Java, but that would destroy all of their own database products). It'll probably be that so far with the disk thing alone. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Naveen Chawla 2011-11-14T13:40:06 http://comments.gmane.org/gmane.comp.java.prevayler/3630 <pre>...so you could seamlessly create and use terabyte+ sized Java objects with it! Stupid? Crazy? Pointless? Impossible? Maybe one day? Or already possible? Maybe by transparently allowing deserialization/serialization of fields to/from memory, based on which ones are most/least used. Or maybe there's an even simpler way. I'm guessing it'd still be way more performant than databases. I like the Prevayler "way" of doing things, so I wouldn't want the user code to change in any way, so it'd still be "Prevayler". ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Naveen Chawla 2011-11-13T16:45:12 http://comments.gmane.org/gmane.comp.java.prevayler/3628 <pre>Hi all, there are a bunch of tests that are failing since the last two commits: SmokeTest, ConfusedFoodTesterStressTest, DeadKingDeepCopyTest and RollbackTest. These are all related to food tasting. Haven't quite had the time to keep up with what you've been talking about but I've noticed you've mentioned getting rid of it, so this is might just be me taking up space in your mail quota. karl [INFO] ------------------------------------------------------------------------ [INFO] Building Prevayler Tests 2.6-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) &lt; at &gt; prevayler-tests --- [INFO] [INFO] --- maven-enforcer-plugin:1.0:enforce (enforce-maven) &lt; at &gt; prevayler-tests --- [INFO] [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) &lt; at &gt; prevayler-tests --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory /Users/kalle/projekt/github/jsamp</pre> Karl Wettin 2011-11-09T14:47:09 http://comments.gmane.org/gmane.comp.java.prevayler/3605 <pre>Put a System.out.println in a transaction and it's outputted twice. It's preventing my direct-transaction version from working properly (e.g. if I add 1 to something, it ends up adding 2). On the deserialize-then-execute version it has no effect on the output, because it's carrying out on a deserialized copy each time. Nonetheless, isn't it a little wasteful? I mean, isn't it making Prevayler run twice as slow as it could? Meaning couldn't it be carrying out its business once instead of twice? Upon examination I found it's: 1. the "royalFoodTaster.receive(timestampCopy);" in "StrictTransactionCensor.java" (line 31) 2. the "notifySubscribers()" call at the end of "publishWithoutWorryingAboutNewSubscriptions()" in "CentralPublisher.java" (line 65). Commenting out either line fixes things. What is the ideal configuration for now in your view? ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2de</pre> Naveen Chawla 2011-11-07T01:27:46 http://comments.gmane.org/gmane.comp.java.prevayler/3603 <pre>I'm ready to tag current revision in git as 2.6 and release to Maven central. Please pull the current revision from github and run "mvn clean install" on your environment to make sure it does not fail before casting a vote : ) ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Karl Wettin 2011-11-05T14:41:29 http://comments.gmane.org/gmane.comp.java.prevayler/3602 <pre>I also solved and committed a bunch of javadoc warnings and errors and made AnotherTest use a type safe Factory so my silly sensitive Jenkins build would not fail it. Thanks Naveen for your contribution! karl ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org </pre> Karl Wettin 2011-11-05T14:38:31 http://comments.gmane.org/gmane.comp.java.prevayler/3584 <pre>After trying to replace my Java method calls with the equivalent Prevayler transaction calls, some things no longer worked. In Java, when I passed in an object and manipulated its contents, it would come out as changed on the other side. That's because the copied reference inside the Java method is still pointing to the same data. In Prevayler, however, after a lot of head scratching, I found that its contents were unchanged on the other side. After even more head scratching, I found that Prevayler wasn't changing the data, but a deserialized copy of the data. This is of course intended, but isn't what I'm personally after, which is ordinary Java-method-call-like behaviour. By adding the following lines of code to the source, this is possible: In Capsule.java: As an instance member: private transient Object _transaction=null; //Transient so that //upon recovery, this //field isn't used below: At the start of the existing constructor: _transaction=transaction; //Hold it And at the beginn</pre> Naveen Chawla 2011-11-03T11:10:03 http://comments.gmane.org/gmane.comp.java.prevayler/3578 <pre>Small point, but by using generics, Prevayler has complete type-safety minus casting. Took me longer than expected, but I've attempted this on Prevayler source. I submitted a "fork" on the prevayler git - https://github.com/Navigateur/prevayler - I'm not very good at git, but I think that's how you want contributions submitted. Needs run time testing. Demo and test code modified to match. Summary usage: instead of Prevayler prevayler use Prevayler&lt;MyTypeToPrevail&gt; prevayler and instead of PrevaylerFactory prevaylerFactory use PrevaylerFactory&lt;MyTypeToPrevail&gt; prevaylerFactory For your custom transactions/queries: replace implements Transaction{ with implements Transaction&lt;MyTypeToPrevail&gt;{ and implements TransactionWithQuery{ with implements TransactionWithQuery&lt;MyTypeToPrevail, MyTypeToReturn&gt;{ same for Query, SureTransactionWithQuery Then, you don't do any casting from Object to prevalent type, nor from ".execute" to return type, as these arrive in native form. ("MyTypeToPrevail" is compiler-checked a</pre> Naveen Chawla 2011-10-28T22:54:29 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.java.prevayler