postReceive(Message<?> message,
MessageChannel channel)
Invoked immediately after a Message has been retrieved but before
it is returned to the caller.
Invoked before the Message is actually sent to the channel.
This allows for modification of the Message if necessary.
If this method returns null, then the actual
send invocation will not occur.
Invoked immediately after a Message has been retrieved but before
it is returned to the caller. The Message may be modified if
necessary. This only applies to PollableChannels.