[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
anonymous wrote : @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) | @TxSynchronized REQUIRES_NEW?The annotated method is executed within a newly generated transaction.If the caller method is already in a transaction, it is suspended. @TxSynchronized : When a @TxSynchronized member method is called, the object instance's lock monitor is held for the duration of the transaction, until it commits or rolls back. When a @TxSynchronized annotated static method or constructor is invoked, the Class's lock monitor is held for the duration of the transaction. This lock works like synchronized, in that the lock is only acquired when a tagged member is called. I think it can solve the clash. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931830#3931830 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931830 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
Not sure, what you are trying to accomplish with it, however, where do you know, 1) that's the EM has only ONE instance of an SLSB? 2) that there is only one EM, which manages the SLSB? 3) that not another instance of something accesses your bean from within another ClassLoader? 4) Scaleability is not an issue for you ? Even if it would work like synchronized, what do you expect/does it buy you? Do you expect, that the method gets always an entity passed, with the latest committed state? If so, I think you have wrong assumptions... View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931847#3931847 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931847 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
So, use @Version? Use Version field each table? but applications that use more than one Version property or field will not be portable. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931900#3931900 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931900 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
elkner, Should you give me a example about using @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) ,@TxSynchronized,@Version? thanks. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931904#3931904 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931904 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
http://docs.jboss.org/ejb3/app-server/HibernateEntityManager/reference/en/html_single/index.html#transactions-optimistic http://docs.jboss.org/ejb3/app-server/HibernateEntityManager/reference/en/html_single/index.html#transactions View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931948#3931948 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931948 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) ? View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931558#3931558 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931558 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
elkner, Are you sure? View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931566#3931566 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931566 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
Well, at least if you use a kind of optimistic locking via @Version one of both should fail and the failed transaction should be rolled back (of course only, if your are not chomping the Exceptions, which automatically trigger the rollback ;-)). Just make sure, that you call em.flush() after merge to be able to catch the exception inside the bean method (i.e. actually before the JTA is finished). If the method does just a simple merge of a simple bean, it might be even relyable without having a NEW TA, since hibernate should catch the problem on flush via @Version. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931626#3931626 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931626 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
But, catch the Exception not all. I want to solve the clash about protect the Entity Instance object from concurrent access. Like synchronized keyword in regular JavaBean, to limited only one can access the object at the same time. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931730#3931730 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931730 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [EJB 3.0] - Re: How to protect an object from concurrent access in EJB3.
this complexion also about some resource, like Queue. In PTP mode, we want only one send the message to the Queue at the same time. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3931731#3931731 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3931731 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnkkid=110944bid=241720dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
