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https://issues.apache.org/jira/browse/SLING-12?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carsten Ziegeler reassigned SLING-12:
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Assignee: Carsten Ziegeler
> Move NodeType management from JcrContentHelper (sling-content-jcr) to
> AbstractSlingRepository (sling-jackrabbit-api)
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SLING-12
> URL: https://issues.apache.org/jira/browse/SLING-12
> Project: Sling
> Issue Type: Improvement
> Components: Content, Repository
> Affects Versions: 2.0.0
> Reporter: Felix Meschberger
> Assignee: Carsten Ziegeler
>
> Currently, the sling-content-jcr bundle has a ContentManagerFactory
> implementation (the JcrContentHelper, used to access Sling ContentManager
> instances), which listens for bundles being registered and registers node
> types registered in the bundles and loads initial content stored in those
> bundles. Additionally, this class cares to setup the Sling ContentManager
> instances used to access the OCM functionality.
> While working on the sling-event bundle, we discovered a race condition with
> node type registration and repository use. To overcome this race condition,
> we propose to move the node type registration part from the
> ContentManagerFactory implementation to the AbstractSlingRepository class in
> the sling-jackrabbit-api bundle. This class is the base class for services
> registered to provide the repository. As such, this class has contact to the
> repository before the service is registered or made available to the users of
> the repository.
> Some background information on the race condition: The JcrContentHelper is
> implemented as an OSGi Component and requires a repository and as such will
> only be activated when the repository is available. The
> AbstractRepositoryEventHandler in the sling-event bundle also requires a
> repository and is also implemented as an OSGi component. When now both
> components are waiting for a repository to become available, the
> AbstractRepositoryEventHandler may be activated before the JcrContentHelper
> is activated and therefore, the node types required by the
> AbstractRepositoryEventHandler are not available yet as the JcrContentHandler
> was not able yet to register them ...
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