[jira] [Created] (FELIX-4507) [DS] "persistent" factory components

["David Jencks (JIRA)" <ji...@apache.org>]

David Jencks created FELIX-4507:
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             Summary: [DS] "persistent" factory components
                 Key: FELIX-4507
                 URL: https://issues.apache.org/jira/browse/FELIX-4507
             Project: Felix
          Issue Type: New Feature
          Components: Declarative Services (SCR)
    Affects Versions: scr-1.8.0
            Reporter: David Jencks
            Assignee: David Jencks
             Fix For: scr-1.8.2


The lifecycle constraints of factory components make them generally useless.  This introduces a different kind of factory component where:
- the componentFactory service is always registered irrespective of whether any references are available
- the components created by newInstance act like regular components created by config admin factory pids; the component is present whether or not references are available and the instance comes and goes as references come and go.  Calling dispose removes the component.
- a modify method is added to the ComponentInstance returned from newInstance. (the ComponentInstance implements a new, extension, interface with the modify method)

There are some consequences, such as ComponentInstance.getInstance() may return null and may not always return the same object.

This behavior can be turned on for a particular component with a "extension" attribute in the component descriptor
xmlns:felix="http://felix.apache.org/xmlns/scr/extensions/v1.0.0"
felix:persistentFactoryComponent="true"




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