IMPRESSIVE BILL! Congratulations! Not only does this is impressive, but it is ridiculously EASY to use.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Bill Burke > Sent: jeudi, 27. mars 2003 01:09 > To: Jboss-Dev > Subject: [JBoss-dev] AOP versioned ACID objects 1st iteration > > > I have implemented a new AOP service for Serializable POJOs, Versioned > Objects. You can transactionally version an object. If you > modify the > object within a transaction, this modification is not seen by other > transactions. If the tx commits, the changes seen, if a > rollback happens > the changes are rolled back. On commit, if another tx has > modified the > object, the tx will rollback (OptimisticLocking). > > The way it works is as follows: > > POJO pojo = new POJO(); > pojo = (POJO)org.jboss.aop.plugins.Versioned.makeVersioned(pojo); > > calling Versioned.makeVersioned creates a proxy that sits in > front of the > real object. > > transactionManager.begin(); > > pojo.callMethod(); > > when callMethod is invoked since there is a transaction, an > interceptor > creates a copy of the REAL pojo and does all further > invocations on this > copy. > > pojo.someField = 5; > > If you have field interception turned on, public field will > also be accessed > via the copy/version > > tm.commit(); > > On commit, a tx Synchronization checks to see if the version you have > created is the latest and greatest. If not an > org.jboss.aop.plugins.OptimisticLockFailure exception is thrown in > beforeCompletion. I'm not sure how this exception is wrapped. > > Some other semantics: > > 1. All method invocations force a version to be created. You > can avoid this > by declared class-metadata as follows: > > <class-metadata name="234234" group="VERSIONED" > class="org.jboss.test.aop.bean.VersionedPOJO"> > <method name="get.*"> > <read-only>true</read-only> > </method> > </class-metadata> > > A readonly method will not cause the creation of a version > and the current > object will be used. > > > An example and unit test is under > testsuite/src/main/org/jboss/test/aop/bean/VersionedObjectTester.java > > The example object VersionedPOJO.java, has 1 interceptor > pointcut declared > on the class to do Tx stuff. See > testsuite/src/resources/aop/META-INF/jboss-aop.xml for more details. > > What would be nice is to also write a TransactionalLock > interceptor for > versioned POJO's that have high OptimisticLock failures. > > Bill > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: > The Definitive IT and Networking Event. Be There! > NetWorld+Interop Las Vegas 2003 -- Register today! > http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en > _______________________________________________ > Jboss-development mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-development > ------------------------------------------------------- This SF.net email is sponsored by: The Definitive IT and Networking Event. Be There! NetWorld+Interop Las Vegas 2003 -- Register today! http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en _______________________________________________ Jboss-development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
