android - Netty websocket close gracefully -


i need make websocket close gracefully. firstly send messages waiting in buffer close.

channel.flush(); channel.close();

seems not right, because dont have completion handler flush method close after done.

is there way this. netty used: 4.1.0.beta3

the trick can use writeandflush empty buffer, attach listener call. unpooled.empty_buffer can make pretty easy.

channel.writeandflush(unpooled.empty_buffer).addlistener(...     channel.close(); )};

if want close channel after flush can use channelfuturelistener.close simplify code. 

channel.writeandflush(unpooled.empty_buffer).addlistener(channelfuturelistener.close);

if enough, may want write static helper method like netty examples do.


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