Daniele Ulrich [
http://community.jboss.org/people/daniele.ulrich] created the discussion
"Re: In memory TaskClient without Mina or JMS"
To view the discussion, visit:
http://community.jboss.org/message/616860#616860
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Hi Franklin
I had already started to do some changes to the classes that are managing persistence. If
you like, you can try if it works this way...
You can start the same way as the original version:
TaskService taskService = new TaskService(emf,
SystemEventListenerFactory.getSystemEventListener());
TaskServiceSession taskSession = taskService.createSession();
If you are in a container managed transaction environment, the persistence should work now
within the JTA scope without further effort.
In a non managed environment you will have to use UserTransactions and XA Datasources to
ensure transactions over multiple databases.There are a lot of implementations available,
maybe you try this one
http://docs.codehaus.org/display/BTM/Hibernate13
http://docs.codehaus.org/display/BTM/Hibernate13. You will have to manually start
transactions
TransactionManagerServices.getConfiguration().setResourceConfigurationFilename("./datasources.properties");
userTransaction = TransactionManagerServices.getTransactionManager();
userTransaction.setTransactionTimeout(60);
userTransaction.begin();
try {
System.out.println("*** DB1 ***");
persistUser(sf1, "user");
listUsers(sf1);
System.out.println("*** DB2 ***");
persistUser(sf2, "user");
listUsers(sf2);
userTransaction.commit();
}
catch (Exception ex) {
ex.printStackTrace();
userTransaction.rollback();
}
this way you can keep multiple databases transactional.... Drawback: it definitely will
have impact to all the other code you have already implemented that is not using JTA. Try
it first without changing your own code, but I'm quite sure, you'll have to use
the userTransactions in every situation where you want to guarantee transactions over more
than one database.
I did not have the time to test the patch properly, so please take care!
The implementation uses threadLocalStorage and heavily depends on calling the
session.dispose() method to perform clean up of the resources of a thread. Make sure it
will be called even if an exception occurs ( catch/finally block ).
Cheers
Daniele
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