Support JCR Component as Consumer
---------------------------------

                 Key: CAMEL-5155
                 URL: https://issues.apache.org/jira/browse/CAMEL-5155
             Project: Camel
          Issue Type: Improvement
          Components: camel-jcr
    Affects Versions: 2.9.1
            Reporter: Woonsan Ko
             Fix For: 2.10.0, 2.9.2


I tried to use jcr component as consumer, expecting jcr observation event 
listener like behavior, but I realized that it's not supported yet. The current 
jcr component supports producer only. So, I'm considering to implement 
JcrConsumer and possibly contribute it in a new CAMEL JIRA issue later. 

My idea is as follows:
i) the uri format is the same. e.g. 
'jcr://user:password@repository/absolute/path/from/node'; the node path is used 
for javax.jcr.observation.ObservationManager#addEventListener(..., absPath, 
...).
ii) additionally, we need parameters for eventTypes, isDeep, uuid[], 
nodeTypeName[], noLocal parameters (See #addEventListener() for detail).
    For example, we may probably use somethings like 
'jcr://user:password@repository/absolute/path/from/node?nodeTypeName=demo:news&eventTypes=3&isDeep=true.
iii) JcrConsumer registers JCR observation event listener from the specified 
uri information.
iv) When events notified, I think it can simply return a list of 
javax.jcr.observation.Event objects in IN message.

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