Randgalt opened a new pull request #320: [CURATOR-533] - introduced circuit 
breaking behavior
URL: https://github.com/apache/curator/pull/320
 
 
   CURATOR-505 introduced circuit breaking behavior via 
CircuitBreakingConnectionStateListener and ConnectionStateListenerDecorator. 
Elastic has been using it to success but reports that the implementation can be 
improved. The existing implementation uses a new CircuitBreaker for each 
ConnectionStateListener set in a Curator client. It turns out that this is not 
ideal. Instead, a shared CircuitBreaker should be used per Curator client.
   
   Unfortunately, the best way to do this is to remove the 
ConnectionStateListenerDecorator semantics and use a different mechanism. This 
Issue proposes to do this and remove ConnectionStateListenerDecorator. This is 
a breaking change but given the short amount of time it's been in Curator it's 
unlikely that it's been widely adopted.
   
   In this commit, ConnectionStateListenerDecorator is removed in favor of 
ConnectionStateListenerManagerFactory. ConnectionStateManager uses this factory 
to create the container to hold registered ConnectionStateListeners. A new 
CircuitBreakerManager now manages the circuit breaking behavior using a shared 
CircuitBreaker.

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