Netty Channel closed detection

3 Solutions Collect From Internet About “Netty Channel closed detection”

If I understood your problem correctly: You want to listen for client channel closed events in server side and do some session cleanup,

There are two ways to listen for channel closed events in Netty :

1) If your server handler extends SimpleChannelHandler/SimpleChannelHandler, then you can override following method and write your session cleanup logic there

public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception;

2) If you have only access to the channel reference, then you can get the channel close future and register your implementation of ChannelFutureListener with your session cleanup logic,

ChannelFuture closeFuture = channel.closeFuture();

closeFuture.addListener(new ChannelFutureListener() {
    public void operationComplete(ChannelFuture future) throws Exception {
        //session cleanup logic

Use IdleStateHandler

You can detect when there is no request/responses in given time intervals.

Check session id and allow renegotiation. Or you may use something like cookie controller.
May I ask off topic question: How does your client on ios interact with netty server? (what framework you use on client side, and what decoder/encoder use? )