public synchronized CompletableFuture<Void> closeChannels() {
List<CompletableFuture<Channel>> futures = new ArrayList<>();
for (Channel c : getAllChannels()) {
futures.add(c.close());
}
@SuppressWarnings("rawtypes")
CompletableFuture[] array = futures.toArray(new CompletableFuture[0]);
closed = true;
return CompletableFuture.allOf(array);
}
public synchronized boolean addChannel(Channel channel) {
if (closed) {
channel.close();
return false;
}
this.connectedChannels.add(channel);
return true;
}