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https://issues.apache.org/jira/browse/OPENJPA-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468719
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Pinaki Poddar commented on OPENJPA-117:
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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
duplicates.
> 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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