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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.logging.ESLogger;
import org.elasticsearch.common.metrics.CounterMetric;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.jboss.netty.channel.*;
import java.util.Set;
/**
*
*/
@ChannelHandler.Sharable
public class OpenChannelsHandler implements ChannelUpstreamHandler {
final Set openChannels = ConcurrentCollections.newConcurrentSet();
final CounterMetric openChannelsMetric = new CounterMetric();
final CounterMetric totalChannelsMetric = new CounterMetric();
final ESLogger logger;
public OpenChannelsHandler(ESLogger logger) {
this.logger = logger;
}
final ChannelFutureListener remover = new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
boolean removed = openChannels.remove(future.getChannel());
if (removed) {
openChannelsMetric.dec();
}
if (logger.isTraceEnabled()) {
logger.trace("channel closed: {}", future.getChannel());
}
}
};
@Override
public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
if (e instanceof ChannelStateEvent) {
ChannelStateEvent evt = (ChannelStateEvent) e;
// OPEN is also sent to when closing channel, but with FALSE on it to indicate it closes
if (evt.getState() == ChannelState.OPEN && Boolean.TRUE.equals(evt.getValue())) {
if (logger.isTraceEnabled()) {
logger.trace("channel opened: {}", ctx.getChannel());
}
boolean added = openChannels.add(ctx.getChannel());
if (added) {
openChannelsMetric.inc();
totalChannelsMetric.inc();
ctx.getChannel().getCloseFuture().addListener(remover);
}
}
}
ctx.sendUpstream(e);
}
public long numberOfOpenChannels() {
return openChannelsMetric.count();
}
public long totalChannels() {
return totalChannelsMetric.count();
}
public void close() {
for (Channel channel : openChannels) {
channel.close().awaitUninterruptibly();
}
}
}