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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-978) Remove circular dependency between VersionManagerImpl and VersionItemStateProvider
Date Fri, 22 Jun 2007 18:29:25 GMT
Remove circular dependency between VersionManagerImpl and VersionItemStateProvider

                 Key: JCR-978
                 URL: https://issues.apache.org/jira/browse/JCR-978
             Project: Jackrabbit
          Issue Type: Improvement
          Components: versioning
            Reporter: Marcel Reutegger
            Priority: Minor

>From a architectural perspective the VersionManagerImpl (VMgr) is at a higher level as
the VersionItemStateProvider (VISP). While the VMgr deals with Items the VISP deals with ItemState
object. Nonetheless the VISP has a reference to the VMgr and also calls the method setNodeReferences(),
which violates the rule of a strictly layered system. E.g. one negative effect of this was
a deadlock as described in JCR-672. It also makes it hard to solve JCR-962.

The attached patch includes the following changes:

- Move method VersionManagerImpl.setNodeReferences() VersionItemStateManager. The method can
operate on ItemStates only and does not need to be in VersionManagerImpl. As can be seen in
the current method it directly calls the PeristenceManager, which indicates it should be located
in a lower layer.
- Promote the class VersionItemStateManager to a top level class
- Change method VersionManagerImpl.createSharedStateManager to return a VersionItemStateManager
- Remove VersionManagerImpl instance variable from VersionItemStateProvider
- In VersionItemStateProvider.setNodeReferences() call VersionItemStateManager.setNodeReferences()
- Instead of using the PersistenceManager in VersionManagerImpl.getItemReferences() use the
ItemStateManager. It also seems that locking is not necessary for this method.

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