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From ahgittin <...@git.apache.org>
Subject [GitHub] incubator-brooklyn pull request: Persist feeds
Date Tue, 05 Aug 2014 14:35:58 GMT
Github user ahgittin commented on the pull request:

    https://github.com/apache/incubator-brooklyn/pull/108#issuecomment-51205959
  
    looks real good.  some comments:
    
    * can we make `Feed` an `EntityAdjunct` for consistency (and ultimately for better display
in the GUI) ?
    * can you build on #106 so we get `uniqueTag` and tags and prevention of duplicate addition?
    * for things like `JmxFeed` do we need to do some special things to recreate the `JMXConnection`
which I'd be surprised if it serializes (though presumably you've tested this) and to minimize
the number of fields which need to be persisted?  (ie declare more things transient and ensure
they are populated on first use)
    * is there any way to warn if a feed is not explicitly attached to an entity?
    * with the above we should have another pass at removing redundant cleanup logic (and
connecting feeds in init, with "service_up" guards as you suggest)
    
    Re the last point this will be easier once some of the things I'm working on for intermediate
`SERVICE_UP` sensors like `SERVICE_PROCESS_IS_RUNNING` is completed (soon!).
    
    You also asked whether switching to adjunct means that feeds should be persisted separately
to the entities.  This feels like a good idea, e.g. in cases where feeds break.  (A feed seems
more brittle to me than enrichers -- and both feel quite similar.)  Hopefully with `BrooklynObjectType`
this becomes relatively easy.
    
    Longer term it might be nice to restructure persistence so that all adjuncts (except for
shared locations?) are stored underneath the entity, e.g. directory structure:
    
        applications/
          12345678/
            entities/
              12345678/
                entity.xml
                enrichers/
                  ...
                feeds/
                  ...
    
    (but we have to be careful not to break existing persistence -- maybe support both, with
adjunct dirs off the root always read, and written for items which aren't attached to entities,
e.g. shared locations, but associated adjuncts moved when rewritten?)



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