[jira] [Issue Comment Edited] (FELIX-3377) Allow a component to update its own service properties

["Felix Meschberger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270637#comment-13270637 ] 

Felix Meschberger edited comment on FELIX-3377 at 5/8/12 5:43 PM:
------------------------------------------------------------------

Updated patch based on FELIX-3377-4.diff :
  - use MethodResult to convey the result of the methods
  - only support Map as a result (in line Map being used to convey configuration to activate)
  - Properly differentiate between null-result (reset service properties) and void (no action)
  - Created a new namespace required to support the new functionality
     (components with older namespaces are not allowed to return Map)
  - updated the testcase for the new namespace

My own patch from May 5th is non-functional.
                
      was (Author: fmeschbe):
    Updated patch based on FELIX-3337-4.diff :
  - use MethodResult to convey the result of the methods
  - only support Map as a result (in line Map being used to convey configuration to activate)
  - Properly differentiate between null-result (reset service properties) and void (no action)
  - Created a new namespace required to support the new functionality
     (components with older namespaces are not allowed to return Map)
  - updated the testcase for the new namespace

My own patch from May 5th is non-functional.
                  
> Allow a component to update its own service properties
> ------------------------------------------------------
>
>                 Key: FELIX-3377
>                 URL: https://issues.apache.org/jira/browse/FELIX-3377
>             Project: Felix
>          Issue Type: Improvement
>          Components: Declarative Services (SCR)
>    Affects Versions:  scr-1.6.0
>            Reporter: David Jencks
>         Attachments: FELIX-3377-2.diff, FELIX-3377-3.diff, FELIX-3377-4-fmeschbe.patch, FELIX-3377-4.diff, FELIX-3377-returnDictionary.patch, FELIX-3377.diff
>
>
> If you just register a service in code, you can give the ServiceRegistration to the service and it can update its service properties to reflect what it can discover about its environment.  This proposes that services registered through DS should be able to do this too, by calling an updateProperties(Dictionary) method on the ComponentContext.  (Since we'd need a spec update to add the method to ComponentContext, I added a new interface that ComponentContextImpl implements).
> Right now a service could get Config Admin and modify the properties there, but then (a) the update method is called even though the component itself initiated the changes and (b) the new property values are persisted which is presumably not desired.
> According to the spec config admin properties override default property values specified in the component xml.  I think that in order to reduce confusion, once a property has been set through config admin it should not be possible to update it through this update method.  This also makes implementing this idea easy.
> IIUC this idea does not make sense for component factories.
> This idea was originally suggested by Erin Schnabel in OSGI bug 2250.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira