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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package com.ning.http.client.providers.netty.channel.pool;
import static com.ning.http.util.DateUtils.millisTime;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.handler.ssl.SslHandler;
import org.jboss.netty.util.Timeout;
import org.jboss.netty.util.Timer;
import org.jboss.netty.util.TimerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ning.http.client.AsyncHttpClientConfig;
import com.ning.http.client.providers.netty.channel.Channels;
import com.ning.http.client.providers.netty.chmv8.ConcurrentHashMapV8;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A simple implementation of {@link com.ning.http.client.providers.netty.channel.pool.ChannelPool} based on a {@link com.ning.http.client.providers.netty.chmv8.ConcurrentHashMapV8}
*/
public final class DefaultChannelPool implements ChannelPool {
private static final Logger LOGGER = LoggerFactory.getLogger(DefaultChannelPool.class);
private static final ConcurrentHashMapV8.Fun> PARTITION_COMPUTER = new ConcurrentHashMapV8.Fun>() {
@Override
public ConcurrentLinkedQueue apply(Object partitionKey) {
return new ConcurrentLinkedQueue<>();
}
};
private final ConcurrentHashMapV8> partitions = new ConcurrentHashMapV8<>();
private final ConcurrentHashMapV8 channelId2Creation = new ConcurrentHashMapV8<>();
private final AtomicBoolean isClosed = new AtomicBoolean(false);
private final Timer nettyTimer;
private final boolean sslConnectionPoolEnabled;
private final int maxConnectionTTL;
private final boolean maxConnectionTTLDisabled;
private final long maxIdleTime;
private final boolean maxIdleTimeDisabled;
private final long cleanerPeriod;
public DefaultChannelPool(AsyncHttpClientConfig config, Timer hashedWheelTimer) {
this(config.getPooledConnectionIdleTimeout(),//
config.getConnectionTTL(),//
config.isAllowPoolingSslConnections(),//
hashedWheelTimer);
}
public DefaultChannelPool(//
long maxIdleTime,//
int maxConnectionTTL,//
boolean sslConnectionPoolEnabled,//
Timer nettyTimer) {
this.sslConnectionPoolEnabled = sslConnectionPoolEnabled;
this.maxIdleTime = maxIdleTime;
this.maxConnectionTTL = maxConnectionTTL;
maxConnectionTTLDisabled = maxConnectionTTL <= 0;
this.nettyTimer = nettyTimer;
maxIdleTimeDisabled = maxIdleTime <= 0;
cleanerPeriod = Math.min(maxConnectionTTLDisabled ? Long.MAX_VALUE : maxConnectionTTL, maxIdleTimeDisabled ? Long.MAX_VALUE
: maxIdleTime);
if (!maxConnectionTTLDisabled || !maxIdleTimeDisabled)
scheduleNewIdleChannelDetector(new IdleChannelDetector());
}
private void scheduleNewIdleChannelDetector(TimerTask task) {
nettyTimer.newTimeout(task, cleanerPeriod, TimeUnit.MILLISECONDS);
}
private static final class ChannelCreation {
final long creationTime;
final Object partitionKey;
ChannelCreation(long creationTime, Object partitionKey) {
this.creationTime = creationTime;
this.partitionKey = partitionKey;
}
}
private static final class IdleChannel {
final Channel channel;
final long start;
final AtomicBoolean owned = new AtomicBoolean(false);
IdleChannel(Channel channel, long start) {
if (channel == null)
throw new NullPointerException("channel");
this.channel = channel;
this.start = start;
}
public boolean takeOwnership() {
return owned.compareAndSet(false, true);
}
@Override
// only depends on channel
public boolean equals(Object o) {
return this == o || (o instanceof IdleChannel && channel.equals(IdleChannel.class.cast(o).channel));
}
@Override
public int hashCode() {
return channel.hashCode();
}
}
private boolean isTTLExpired(Channel channel, long now) {
if (maxConnectionTTLDisabled)
return false;
ChannelCreation creation = channelId2Creation.get(channel.getId());
return creation != null && now - creation.creationTime >= maxConnectionTTL;
}
private final class IdleChannelDetector implements TimerTask {
private boolean isIdleTimeoutExpired(IdleChannel idleChannel, long now) {
return !maxIdleTimeDisabled && now - idleChannel.start >= maxIdleTime;
}
private List expiredChannels(ConcurrentLinkedQueue partition, long now) {
// lazy create
List idleTimeoutChannels = null;
for (IdleChannel idleChannel : partition) {
if (isTTLExpired(idleChannel.channel, now) || isIdleTimeoutExpired(idleChannel, now)
|| !Channels.isChannelValid(idleChannel.channel)) {
LOGGER.debug("Adding Candidate expired Channel {}", idleChannel.channel);
if (idleTimeoutChannels == null)
idleTimeoutChannels = new ArrayList<>();
idleTimeoutChannels.add(idleChannel);
}
}
return idleTimeoutChannels != null ? idleTimeoutChannels : Collections. emptyList();
}
private final List closeChannels(List candidates) {
// lazy create, only if we have a non-closeable channel
List closedChannels = null;
for (int i = 0; i < candidates.size(); i++) {
// We call takeOwnership here to avoid closing a channel that has just been taken out
// of the pool, otherwise we risk closing an active connection.
IdleChannel idleChannel = candidates.get(i);
if (idleChannel.takeOwnership()) {
LOGGER.debug("Closing Idle Channel {}", idleChannel.channel);
close(idleChannel.channel);
if (closedChannels != null) {
closedChannels.add(idleChannel);
}
} else if (closedChannels == null) {
// first non closeable to be skipped, copy all previously skipped closeable channels
closedChannels = new ArrayList<>(candidates.size());
for (int j = 0; j < i; j++)
closedChannels.add(candidates.get(j));
}
}
return closedChannels != null ? closedChannels : candidates;
}
public void run(Timeout timeout) throws Exception {
if (isClosed.get())
return;
try {
if (LOGGER.isDebugEnabled()) {
for (Object key : partitions.keySet()) {
LOGGER.debug("Entry count for : {} : {}", key, partitions.get(key).size());
}
}
long start = millisTime();
int closedCount = 0;
int totalCount = 0;
for (ConcurrentLinkedQueue partition : partitions.values()) {
// store in intermediate unsynchronized lists to minimize the impact on the ConcurrentLinkedQueue
if (LOGGER.isDebugEnabled())
totalCount += partition.size();
List closedChannels = closeChannels(expiredChannels(partition, start));
if (!closedChannels.isEmpty()) {
for (IdleChannel closedChannel : closedChannels)
channelId2Creation.remove(closedChannel.channel.getId());
partition.removeAll(closedChannels);
closedCount += closedChannels.size();
}
}
long duration = millisTime() - start;
LOGGER.debug("Closed {} connections out of {} in {}ms", closedCount, totalCount, duration);
} catch (Throwable t) {
LOGGER.error("uncaught exception!", t);
}
scheduleNewIdleChannelDetector(timeout.getTask());
}
}
public boolean offer(Channel channel, Object partitionKey) {
if (isClosed.get() || (!sslConnectionPoolEnabled && channel.getPipeline().get(SslHandler.class) != null))
return false;
long now = millisTime();
if (isTTLExpired(channel, now))
return false;
boolean added = partitions.computeIfAbsent(partitionKey, PARTITION_COMPUTER).add(new IdleChannel(channel, now));
if (added)
channelId2Creation.putIfAbsent(channel.getId(), new ChannelCreation(now, partitionKey));
return added;
}
public Channel poll(Object partitionKey) {
IdleChannel idleChannel = null;
ConcurrentLinkedQueue partition = partitions.get(partitionKey);
if (partition != null) {
while (idleChannel == null) {
idleChannel = partition.poll();
if (idleChannel == null) {
// pool is empty
break;
} else if (!Channels.isChannelValid(idleChannel.channel)) {
idleChannel = null;
LOGGER.trace("Channel not connected or not opened, probably remotely closed!");
} else if (!idleChannel.takeOwnership()) {
idleChannel = null;
LOGGER.trace("Couldn't take ownership of channel, probably in the process of being expired!");
}
}
}
return idleChannel != null ? idleChannel.channel : null;
}
@Override
public boolean removeAll(Channel channel) {
ChannelCreation creation = channelId2Creation.remove(channel.getId());
return !isClosed.get() && creation != null && partitions.get(creation.partitionKey).remove(channel);
}
@Override
public boolean isOpen() {
return !isClosed.get();
}
@Override
public void destroy() {
if (isClosed.getAndSet(true))
return;
for (ConcurrentLinkedQueue partition : partitions.values()) {
for (IdleChannel idleChannel : partition)
close(idleChannel.channel);
}
partitions.clear();
channelId2Creation.clear();
}
private void close(Channel channel) {
// FIXME pity to have to do this here
Channels.setDiscard(channel);
channelId2Creation.remove(channel.getId());
Channels.silentlyCloseChannel(channel);
}
private void flushPartition(Object partitionKey, ConcurrentLinkedQueue partition) {
if (partition != null) {
partitions.remove(partitionKey);
for (IdleChannel idleChannel : partition)
close(idleChannel.channel);
}
}
@Override
public void flushPartition(Object partitionKey) {
flushPartition(partitionKey, partitions.get(partitionKey));
}
@Override
public void flushPartitions(ChannelPoolPartitionSelector selector) {
for (Map.Entry> partitionsEntry : partitions.entrySet()) {
Object partitionKey = partitionsEntry.getKey();
if (selector.select(partitionKey))
flushPartition(partitionKey, partitionsEntry.getValue());
}
}
}
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