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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-245) Automatic repository shutdown
Date Thu, 06 Oct 2005 11:07:52 GMT
Automatic repository shutdown
-----------------------------

         Key: JCR-245
         URL: http://issues.apache.org/jira/browse/JCR-245
     Project: Jackrabbit
        Type: New Feature
  Components: core  
    Reporter: Jukka Zitting


Currently Jackrabbit relies on two mechanisms for safely shutting down a repository:

    1) client application invoking RepositoryImpl.shutdown(), or
    2) the shutdown hook installed by RepositoryImpl being run

Both of these mechanisms have problems:

    1) The shutdown() method is not a part of the JCR API, thus making the client application
depend on a Jackrabbit-specific feature
    2) In some cases the shutdown hook is not properly run (see issues JCR-120 and JCR-233)

I think the JCR spec thinks of the Repository and Session interfaces as being somewhat similar
to the JDBC DataSource and Connection interfaces. The Repository instances have no real lifecycle
methods while the Session instances have clearly specified login and logout steps. (DataSource.getConnection()
= Repository.login(), Session.logout() = Connection.close()) However the Jackrabbit implementation
defines an explicit lifecycle for the RepositoryImpl instances.

This causes problems especially for container environments (JNDI, Spring) where it is hard
or even impossible to specify a shutdown mechanism for resource factories like the Repository
instances. The current solution for such environments is to use a shutdown hook, but as reported
this solution does not work perfectly in all cases.

How about if we bound the RepositoryImpl lifecycle to the lifecycles of the instantiated Sessions.
A RepositoryImpl instance could initialize (and lock) the repository when the first session
is opened and automatically shut down when the last session has logged out. As long as the
sessions are properly logged out (or finalized by the garbage collector) there would be no
need for an explicitly RepositoryImpl.shutdown() call. The current behaviour of pre-initializing
the repository and shutting down during a shutdown hook could be enabled with a configuration
option for environments (like global JNDI resources) in which the shutdown hooks work well.


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