How to add a common listener for update of multiple EntityObjects.

Hi,
We are using jdev 10.1.2.1.0 and the Business Components version is 10.1.2.18.73.
My requirement is to have a common listener method being called whenever , from the given list of entityobjects, any EO is updated. I tried googling but not able to proceed. I saw TransactionpostListener being used but i'm not sure of its purpose.
I'll appreciate If someone could help with a code snippet.
Thanks ang Regards,
Chetak Kansara.

That's wat i want to know.. say my case is as follows...
I have EntiyAImpl which maps to DB table EntityA.
and an EntiyBImpl which maps to DB table EntityB.
I have a custom class method MyClass.MyMethod() which based on the entityobject modifed inserts some data in its history table.
Now when ever a row is modified or deleted in any of EntityA or EntityB , i want to call MyClass.MyMethod().
I'm not able to figure out where to stuff the code to call the MyClass.MyMethod().
Currently I'm trying that with the sourceChagned(Entityevent e) method in the ViewImpl class.

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