how to modify packets to be sent

Discussion created by slando on Dec 3, 2007
Latest reply on Dec 4, 2007 by slando


Hi there,


i have a question regarding filtering and modifying packets to be sent. Here is my SIMPLE scenario. A user types in some message, such as "hello". Then a sparkplug intercepts it and append "world" before it is sent. So the receiver receives "hello world". So far, I've tried the following:


1) chatManager.addMessageFilter, where the MessageFilter has two methods "filterOutgoing" and "filterIncoming"

2) xmppConnection.addPacketWriterLIstener

3) xmppConnection.addPacketWriterInterceptor


However, they all behave a little bit randomly, i.e. they don't modify all messages.


I think the reason is somehow along the line where the filters (1)  and listeners (2) are asynchronous with the sending thread. So if the modifying thread is faster than the sending one, then everything is good; otherwise, we still get unmodified message.


The PacketIntercepor (3) is supposed to be synchronous, but it still cannot do what I want. I'm copying the javadoc of its method here.



Process the packet that is about to be sent to the server. The intercepted packet can be modified by the interceptor.


Interceptors are invoked using the same thread that requested the packet to be sent, so it's very important that implementations of this method not block for any extended period of time.



So could some one please tell me how to do this simple job in Spark/Smack/Sparkplug at all? I asked a similar question a week ago ( but didn't get an answer. Hope it's different this time. Thanks a lot.