Title: ChannelListener
Description: An interface to listens to incoming messages from a channel
When a message is received, the Channel will invoke the channel listener in a conditional sequence.
if ( listener.accept(msg,sender) ) listener.messageReceived(msg,sender);
A ChannelListener implementation MUST NOT return true on accept(Serializable, Member)
if it doesn't intend to process the message. The channel can this way track whether a message
was processed by an above application or if it was just received and forgot about, a featuer required
to support message-response(RPC) calls
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