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From "Steven E. Harris (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIX-222) iPOJO should automatically propagate configuration properties as service properties, per CM spec.
Date Sun, 04 Mar 2007 20:23:50 GMT
iPOJO should automatically propagate configuration properties as service properties, per CM
spec.
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                 Key: FELIX-222
                 URL: https://issues.apache.org/jira/browse/FELIX-222
             Project: Felix
          Issue Type: Improvement
          Components: iPOJO
         Environment: Not relevant.
            Reporter: Steven E. Harris


The Configuration Admin Service Specification advises in Section 104.4.3, Property Propagation,
that:

  An implementation of a Managed Service should copy all the properties of the Dictionary
object
  argument in updated(Dictionary), known or unknown, into its service registration properties
  using ServiceRegistration.setProperties.

It looks like iPOJO does some of this propagation for a ManagedService in ConfigurationHandler.updated()
around line 256, apparently only propagating the properties not known as "configurable properties".
However, I think this reading of the specification may be too literal, in that iPOJO does
not do the same propagation of the initial properties provided to a ManagedServiceFactory.

ComponentManager implements ManagedServiceFactory. In its updated(String, Dictionary) method,
it calls on createComponentInstance(), which then calls on InstanceManager.configure(), which
lets each Handler take its turn configuring the new instance. Of particular interest here
is ProvidedServiceHandler.configure(). It only exposes properties defined in <property>
elements inside the <provides> element of a component metadata specification. Any properties
provided in the initial configuration not defined beforehand in the metadata are ignored and
not published as service properties.

The CM specification does note:

  A configuration target service may ignore any configuration properties it
  does not recognize, or it may change the values of the configuration properties
  before these properties are registered. Configuration properties in the
  Framework service registry are not strictly related to the configuration
  information.

The seems to contradict the advise in the first paragraph, perhaps just clarifying that compliance
is not mandatory. What would be useful is some directive on the <provides> element that
would allow all unknown configuration properties to be propagated as service properties. At
present, this propagation must be done manually by defining each service property under the
<provides> element, which makes it impossible to ever propagate an unknown configuration
property.

Finally, though the CM specification does talk about "a Managed Service" and mentions the
single-argument updated(Dictionary) method, the rest of the text in Section 104.4.3 sounds
as though it's describing how both ManagedService and ManagedServiceFactory should work.

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