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From "Andy Schwartz (JIRA)" <...@myfaces.apache.org>
Subject [jira] Created: (TRINIDAD-2055) Introduce ChangeManager wrapper class
Date Wed, 09 Mar 2011 19:29:59 GMT
Introduce ChangeManager wrapper class
-------------------------------------

                 Key: TRINIDAD-2055
                 URL: https://issues.apache.org/jira/browse/TRINIDAD-2055
             Project: MyFaces Trinidad
          Issue Type: Improvement
    Affects Versions: 2.0.0-beta-2
            Reporter: Andy Schwartz
            Assignee: Andy Schwartz
            Priority: Minor


One way that users might customize change management behavior is to create a proxy ChangeManager
that delegates through to an underlying ChangeManager (eg. to SessionChangeManager) for most
operations after performing filtering of the incoming changes.  It is possible to implement
such proxy ChangeManager classes today.  However, without a wrapper base class, these implementations
are fragile - ie. they will break if we ever introduce a new method to the ChangeManager API.

A more robust solution would be to introduce a base wrapper class for proxy ChangeManager
implementations to extend.  That way, in the event that we do introduce new ChangeManager
methods, the base wrapper class can be updated in parallel, protecting subclasses from the
change.

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