@Override
public boolean add(Channel channel) {
ConcurrentSet<Channel> set =
channel instanceof ServerChannel ? serverChannels : nonServerChannels;
boolean added = set.add(channel);
if (added) {
channel.closeFuture().addListener(remover);
}
if (stayClosed && closed) {
// First add channel, than check if closed.
// Seems inefficient at first, but this way a volatile
// gives us enough synchronization to be thread-safe.
//
// If true: Close right away.
// (Might be closed a second time by ChannelGroup.close(), but this is ok)
//
// If false: Channel will definitely be closed by the ChannelGroup.
// (Because closed=true always happens-before ChannelGroup.close())
//
// See https://github.com/netty/netty/issues/4020
channel.close();
}
return added;
}
