@abc.abstractmethod<EOL><INDENT>@synchronized(lock)<EOL>def enqueue(self, destination, frame):<DEDENT>
Store message (frame) for specified destinationination.

@param destination: The destinationination queue name for this message (frame).
@type destination: C{str}

@param frame: The message (frame) to send to specified destinationination.
@type frame: C{stompclient.frame.Frame}