netty about write()

[mumuyu99]

 Hi
     I have a problem on write !
      Some times ,I want to know the write is success or no!
     So ,I write cord :

         ChannelFuture future=_channel.write(bytes);
         future.addListener(new ChannelFutureListener() {
             public void operationComplete(ChannelFuture future) {
            	 System.out.println("future.isSuccess()="+future.isSuccess());
                 if(!future.isSuccess()){
            	    System.out.println("send future no success!");
            	    _channel.close();
               }
             }
         });

    When some clients  shut down network by pull line, My cord also can'not
println 
   'send future no success!' 
    Why? Thanks!
 Daniel
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