question: private boolean notifyPersistentConnectionListener ( HttpMessage httpMessage , Socket inSocket , ZapGetMethod method ) { boolean keepSocketOpen = false ; PersistentConnectionListener listener = null ; synchronized ( persistentConnectionListener ) { for ( int i = 0 ; i < persistentConnectionListener . size ( ) ; i ++ ) { listener = persistentConnectionListener . get ( i ) ; try { if ( listener . onHandshakeResponse ( httpMessage , inSocket , method ) ) { keepSocketOpen = true ; break ; } } catch ( Exception e ) { logger . warn ( e . getMessage ( ) , e ) ; } } } return keepSocketOpen ; }
target:  Go thru each listener and offer him to take over the connection. The first observer that returns true gets exclusive rights.