I am building a server client application using netty and ios, I am facing a problem when the user just turns off WiFi on his/her ios device, the netty server does not know about it. The server needs to know to do cleanup for that user and set him/her offline, but now when the user tries to connect again, the server just tells him that he/she is already online.
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() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
//session cleanup logic
}
});