protected void processDispatch(Command command) throws IOException { MessageDispatch messageDispatch = (MessageDispatch) (command.isMessageDispatch() ? command : null); try { if (!stopping.get()) { if (messageDispatch != null) { protocolManager.preProcessDispatch(messageDispatch); } dispatch(command); } } catch (IOException e) { if (messageDispatch != null) { TransmitCallback sub = messageDispatch.getTransmitCallback(); protocolManager.postProcessDispatch(messageDispatch); if (sub != null) { sub.onFailure(); } messageDispatch = null; throw e; } } finally { if (messageDispatch != null) { TransmitCallback sub = messageDispatch.getTransmitCallback(); protocolManager.postProcessDispatch(messageDispatch); if (sub != null) { sub.onSuccess(); } } } }