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https://issues.apache.org/jira/browse/SLING-4154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207809#comment-14207809
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Marius Petria commented on SLING-4154:
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Question from [~tripod]: why don't you rely on OSGi alone? it seems like you
recreate the
service/component registration.
Answer:
Agents have several subcomponents. We want the agent to be the unit of
configuration, i.e. the agent configuration must be able to personalize all its
subcomponents. So the problem was: how do we build an agent and its
subcomponents from a map of properties that contains also the configs for the
subcomponents. The solution to that was to have a factory that can parse the
map of properties and assemble everything. You can see in [1] how such a deep
configuration looks like for an agent.
[1]
https://github.com/apache/sling/blob/37d51791611f20aa7c4e927fd3eaefc499ff8215/contrib/extensions/distribution/sample/src/main/resources/SLING-CONTENT/libs/sling/distribution/jcrsettings/agents/jpublish.json
> Discuss distribution components creation and configuration
> -----------------------------------------------------------
>
> Key: SLING-4154
> URL: https://issues.apache.org/jira/browse/SLING-4154
> Project: Sling
> Issue Type: Task
> Components: Distribution
> Reporter: Marius Petria
>
> Distribution has one main component (agent) and several secondary components
> (triggers, exporters and importers).
> These can be created as java objects using a DistributionComponentFactory.
> The core framework provides a DefaultDistributionComponentFactory that will
> create the components implemented in the core but a client can define its own
> components and factory and the default component factory will use those to
> create a component it does not know of.
> The core framework also provides two ways of registering such a java object
> as an OSGI service:
> 1. using osgi configs, the osgi properties are parsed and passed to the
> factory, a component is created and registered
> (GenericDistributionComponentFactory)
> 2. resource configs, the properties of a resource are parsed and passed to
> the factory, a component is created and registered
> (ResourceBasedDistributionComponentFactory)
> Components registered as OSGI services are available as resources via
> OsgiServicePropertiesResourceProvider.
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