Refactor ObservationManagerFactory
----------------------------------

                 Key: JCR-565
                 URL: http://issues.apache.org/jira/browse/JCR-565
             Project: Jackrabbit
          Issue Type: Improvement
          Components: observation
            Reporter: Jukka Zitting
            Priority: Minor


The current o.a.j.core.observation.ObservationManagerFactory class has two main 
responsibilities:

    1) Create new ObservationManagerImpl instances as an observation manager 
factory
    2) Manage event consumers and dispatch events within a workspace

These two responsibilities are quite unrelated and the factory responsibility 
essentially boils down to the following method that is only ever invoked within 
WorkspaceImpl.getObservationManager():

    public ObservationManagerImpl createObservationManager(SessionImpl session, 
ItemManager itemMgr) {
        return new ObservationManagerImpl(this, session, itemMgr);
    }

To simplify the design I'd inline this method and rename 
ObservationManagerFactory to ObservationDispatcher to better reflect the one 
remaining responsibility.

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