@synchronized(lock)<EOL><INDENT>def clear_transaction_frames(self, connection, transaction):<DEDENT>
try:<EOL><INDENT>del self._transaction_frames[connection][transaction]<EOL><DEDENT>except KeyError:<EOL><INDENT>pass<EOL><DEDENT>
Clears out the queued ACK frames for specified transaction. 

This is called by the engine when there is a commit command.

@param connection: The client connection that committed the transaction.
@type connection: L{coilmq.server.StompConnection}

@param transaction: The transaction id (which was committed).
@type transaction: C{str}