java - Netty TCP Client async messages -

i building tcp client receive , sending messages. followed steps on netty user guide , wrote simple tcp client custom handler extending channelinboundhandleradapter.

in hander store channelhandlercontext:

 @override  public void channelactive (channelhandlercontext ctx) throws exception {    super.channelactive (ctx);    this.ctx = ctx;  } 

then have send method uses channelhandlercontext send messages:

 public void sendmessage (string msg) {   if (ctx == null) {     return;   }   channelfuture cf = ctx.write (unpooled.copiedbuffer (msg, charsetutil.utf_8));   ctx.flush (); } 

the other option have found use channel object in client class

 channel.writeandflush (msg); 

i need call send method different thread. best way ?

thanks in advance.

both channelhandlercontext , channel thread safe, can write thread without worrying.

if use channel.write(), message have travel through complete pipeline. if use channelhandlercontext.write() have travel through upstream handlers in pipeline. therefore writing channelhandlercontext more efficient.

and note of time better use writeandflush() instead of write().

have @ this presentation more details.