[jboss-user] [JBoss Seam] - Conversation and Manual Flush Mode

[dapeng]

Hi,

I hope that I understand everything in the right way. Seam always starts and commits 2 Tx for each request. By default flush type of AUTO, hibernate entity manager will also commit the 2 txs. (Is there an optimization to handle the second tx for render response phase in a read-only mode? Don't think it is always reasonable, but just curious to know) In a long-running conversation over several request, this commitment of tx leads to a database flush, which is actually not wished. So the right strategy is to use the manual flush mode and flush explicitly at the end of conversation. 

I hope I got the right understanding so far. It will be great if you guys can give a short conformation.

Now my question: I am using Seam in a layered architecture, in which the I would not like to expose the entity manager into the JSF layer. I know this is not the Seam philosophy, but it is a fact. Do you have a suggestion, how I can handle this manual flush at the end of the conversaton in a elegant way. 

Option 1 is to define corresponding methods in "service backend" (for @End), which always invoke entityManager.flush(). This could limit the reusability of these methods, because they can be used in environments where auto flush is more appropriate.
Option 2 is to introduce a FlushService, which can be used by JSF beans to start the flush. But I don't like this idea either, because it is really not natural. 

I am really keen to know whether you have better ideas. 

Thx in advance.

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