jai1 opened a new pull request #556: CPP Client - Reducing number of duplicate 
lookups
URL: https://github.com/apache/incubator-pulsar/pull/556
 
 
   ### Motivation
   (A) During a graceful shutdown, the broker sends CLOSE_PRODUCER / 
CLOSE_CONSUMER command to the client, which triggers the reconnection logic.
   (B) After the connection is closed the ClientConnection.close() also 
triggers the reconnection logic for all registered consumers/producers.
   If (A) doesn't complete before (B) then lookups and CREATE_PRODUCER / 
CREATE_CONSUMER commands are sent twice - this is not a functional issue 
because the broker returns success for the duplicate command but this leads a 
twice the required number of lookups.
   
   ### Modifications
   
   Put all operation on the producers and consumers map (in ClientConnection) 
inside a lock.
   Remove the consumer/producer from producers/consumers map if CLOSE_PRODUCER 
/ CLOSE_CONSUMER command is received.
   
   ### Result
   
   No functional change, lesser lookups.
 
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