/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search licenses this
* file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.netty;
import org.elasticsearch.common.netty.channel.Channel;
import org.elasticsearch.common.netty.channel.ChannelEvent;
import org.elasticsearch.common.netty.channel.ChannelFuture;
import org.elasticsearch.common.netty.channel.ChannelFutureListener;
import org.elasticsearch.common.netty.channel.ChannelHandler;
import org.elasticsearch.common.netty.channel.ChannelHandlerContext;
import org.elasticsearch.common.netty.channel.ChannelState;
import org.elasticsearch.common.netty.channel.ChannelStateEvent;
import org.elasticsearch.common.netty.channel.ChannelUpstreamHandler;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author kimchy (shay.banon)
*/
@ChannelHandler.Sharable
public class OpenChannelsHandler implements ChannelUpstreamHandler {
private Set<Channel> openChannels = ConcurrentCollections.newConcurrentSet();
private AtomicLong openChannelsCount = new AtomicLong();
private final ChannelFutureListener remover = new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) throws Exception {
boolean removed = openChannels.remove(future.getChannel());
if (removed) {
openChannelsCount.decrementAndGet();
}
}
};
@Override public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
if (e instanceof ChannelStateEvent) {
ChannelStateEvent evt = (ChannelStateEvent) e;
if (evt.getState() == ChannelState.OPEN) {
boolean added = openChannels.add(ctx.getChannel());
if (added) {
openChannelsCount.incrementAndGet();
ctx.getChannel().getCloseFuture().addListener(remover);
}
}
}
ctx.sendUpstream(e);
}
public long numberOfOpenChannels() {
return openChannelsCount.get();
}
public void close() {
for (Channel channel : openChannels) {
channel.close().awaitUninterruptibly();
}
}
}