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transaction management [message #735278]

Tue, 11 October 2011 11:58

Bertin Kiekebosch

Messages: 330
Registered: August 2011

Senior Member

Hi,

i read a lot of docs i could find about scout and the most of these focus on the client. I still have a question about the server side.

How are transactions managed.

Is this done by a "scout" service or filter or do I have to use some other way. Is there a good example for example with hibernate or with JDBC.

Regards Bertin

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Re: transaction management [message #735288 is a reply to message #735278]

Tue, 11 October 2011 12:42

Ivan Motsch

Messages: 154
Registered: March 2010

Senior Member

Thanks for the question.
In short:
Every request to the server is one transaction.

Medium:
The servlet is the ServiceTunnelServlet at /process and the transaction is run under the user's (JAAS) Subject with a ITransaction in the thread context. ThreadContext.get(ITransaction) delivers the "current" transaction. The wrapper of the transaction is always a scout ServerJob. Every resource taking part in the transaction (similar to xa) can register a ITransactionMember to the transaction. Once the transaction is closed it is either committed (2-phase) or rolled back based on the property ITransaction.getFailures() that must be null for a commit.

Long:
Check out the sequence diagram at
http://www.eclipse.org/forums/index.php/mv/msg/243161/730684/#msg_730684

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Re: transaction management [message #735790 is a reply to message #735288]

Wed, 12 October 2011 17:40

Claudio Guglielmo

Messages: 256
Registered: March 2010

Senior Member

Hi Ivan

I added your explanation with slightly modifications to the scout documentation: http://wiki.eclipse.org/Scout/Documentation#Transaction_Handling

Regards
Claudio

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