The affinity of session and Application Module API
Hi allWe have some problems to understand why - the session affinity is not preserved when you use some of the methods provided by the interface of the AOS.
In particular, we analyzed the effects of the method post_changes on the session of DB that the referenced instance of AM used to execute the method:
We have seen that post_changes, when called, outside any internal modification of ADF, also locks the tables DB changes the user through the web interface of the session. Very well.
Now if another user opens a Web Session and, for some reason, the above AOS instance is recycled to the pool, then the DB used by instance AM session is restored to be ready for the demands of the new session, so the previous table locks are lost and the new user can basically do anything with the table/view objects.
The question is:
Why are they not all the effects of post_changes (which is the framework method) "passivees/enabled" as the other methods of the framework, for example: "insert/delete/update? or why locks are lost?
We expected these paintings remain locked after the instance referenced AM was recycled (i.e. is no rollack should have be done).
Basically, we think that there is something inconsistent in the behavior of the framework: simultaneity is always choerent for some base DML (insert, update, delete) via the API framework, but, on the other hand, at least in the case of post_changes the "effects" of the two concurrent on AOS users same instance may be gone.
Could someone give no explanation?
Because postChanges actually performs the DML against the underlying tables in the DB instead of simply store the intermediate layer state information. The effects of the postChanges cannot be passive/active. If you do not postChanges, then the insert/delete/update is just the State information in the middle tier and can be passivated/activated.
In short, as we discussed on your other thread, you shouldn't be trying to keep DB state between requests :)
Tags: Java
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