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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-5801) BDB store: remove facade initialisation task
Date Fri, 06 Jun 2014 14:11:01 GMT
Keith Wall created QPID-5801:

             Summary: BDB store: remove facade initialisation task
                 Key: QPID-5801
                 URL: https://issues.apache.org/jira/browse/QPID-5801
             Project: Qpid
          Issue Type: Improvement
          Components: Java Broker
            Reporter: Keith Wall
            Assignee: Keith Wall

Currently the BDB Store's EnvironmentFacade uses four initialisation tasks that are executed
once the store becomes writable.  For non-HA, these take place once as the store is opened,
for HA, these take place each time the node becomes master.

It has been identified that this design is problematic as it requires the facade to know at
construction time to what purpose it will be put.  This is contrary to the ideas for VirtualHostNodes/VirtualHosts:
VirtualHostsNodes (which in the BDB case cause the creation of the facade) have no way to
predict what VirtualHost type will be put within it so cannot predict the list of tasks.

This refactoring will eliminate the initialisation tasks in the following manner:

* MaxIdTask - eliminated in favour of an JE sequence
* DiskSpaceTask - quota algorithm will no longer require that to know the current diskspace
on open (or becoming master)
* OpenDatabaseTask - database will be opened (and cached) by side-effect
* UpgradeTask - structure upgrade will be caused explicitly by the VirtualHostNode or VirtualHost.

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