[ http://issues.apache.org/jira/browse/JCR-65?page=all ]
Jukka Zitting reassigned JCR-65:
--------------------------------
Assign To: Jukka Zitting
> ChainedPersistenceManager
> -------------------------
>
> Key: JCR-65
> URL: http://issues.apache.org/jira/browse/JCR-65
> Project: Jackrabbit
> Type: New Feature
> Reporter: Edgar Poce
> Assignee: Jukka Zitting
> Priority: Minor
> Attachments: 05-03-15-chained-persistence.zip, uml-class.gif
>
> Overview
> The package contains the classes that provide chaining of Persistence
> Managers support through an implementation of the chain of responsibility
> pattern.
> The ChainedPersistenceManager class is the chain's external controller.
> The current implementation uses composition instead of inheritance. The
> concrete handlers (PersistenceManager) are private members instead of
> subclasses.
> For reading commands no evaluation is performed, the
> ChainedPersistenceManager returns the response of the first handler that
> finds the object.
> For writing commands, the PersistenceManagerHandler class delegates
> conditionally the persistence calls to the concrete implementation based on a
> custom evaluation.
> Custom PersistenceManagerEvaluator implementations can be set through
> configuration.
> Custom listeners can be added to the ChainedPersistenceManager class. It
> allows to perform custom operations on "after init" and "before close"
> events.
> Warning
> This package should be used only in a couple of cases and none of them is the
> best practice.
> * Sharing jcr data with others systems through a custom PersistenceManager
> * Integrating a legacy system
> Reliability, integrity and performance of the PersistenceManager are
> *crucial* to the overall stability & performance of the repository. if e.g.
> the data that a PersistenceManager is based upon is allowed to change through
> external means the integrity of the repository would be at risk (think of
> referential integrity/ node references e.g.).
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
http://www.atlassian.com/software/jira
