Pinaki Poddar commented on OPENJPA-117:

The use case is the code that intends to register a listener but gets the 
PersistenceManager/EntityManager from another layer outside of its own control. 
Then the registerer does not know whether the obtained PM/EM is already 
carrying a particular listener or not. Currently the internal collection of 
listener is not a Set, so unconditionally adding a listener results in 

> Collection of TransactionListeners registered to a Broker should be available 
> as unmodifiable collection
> --------------------------------------------------------------------------------------------------------
>                 Key: OPENJPA-117
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-117
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: kernel
>            Reporter: Pinaki Poddar
>         Assigned To: Pinaki Poddar
>            Priority: Minor
> Currently TransactionListeners can be added/removed to a broker but the list 
> of transaction listeners registered to a particular broker is not available. 
> Such a collection can be made available in read-only mode so a caller can 
> determine whether to add a new listener or not, or whether a particular 
> listener is already registered. 

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