org.jboss.netty.handler.traffic.ChannelTrafficShapingHandler Maven / Gradle / Ivy
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/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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.jboss.netty.handler.traffic;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.handler.execution.ExecutionHandler;
import org.jboss.netty.handler.execution.MemoryAwareThreadPoolExecutor;
import org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor;
import org.jboss.netty.util.ObjectSizeEstimator;
import org.jboss.netty.util.Timeout;
import org.jboss.netty.util.Timer;
import org.jboss.netty.util.TimerTask;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* This implementation of the {@link AbstractTrafficShapingHandler} is for channel
* traffic shaping, that is to say a per channel limitation of the bandwidth.
*
* The general use should be as follow:
*
* Add in your pipeline a new ChannelTrafficShapingHandler, before a recommended {@link ExecutionHandler} (like
* {@link OrderedMemoryAwareThreadPoolExecutor} or {@link MemoryAwareThreadPoolExecutor}).
* ChannelTrafficShapingHandler myHandler = new ChannelTrafficShapingHandler(timer);
* timer could be created using HashedWheelTimer
* pipeline.addLast("CHANNEL_TRAFFIC_SHAPING", myHandler);
*
* Note that this handler has a Pipeline Coverage of "one" which means a new handler must be created
* for each new channel as the counter cannot be shared among all channels. For instance, if you have a
* {@link ChannelPipelineFactory}, you should create a new ChannelTrafficShapingHandler in this
* {@link ChannelPipelineFactory} each time getPipeline() method is called.
*
* Other arguments can be passed like write or read limitation (in bytes/s where 0 means no limitation)
* or the check interval (in millisecond) that represents the delay between two computations of the
* bandwidth and so the call back of the doAccounting method (0 means no accounting at all).
*
* A value of 0 means no accounting for checkInterval. If you need traffic shaping but no such accounting,
* it is recommended to set a positive value, even if it is high since the precision of the
* Traffic Shaping depends on the period where the traffic is computed. The highest the interval,
* the less precise the traffic shaping will be. It is suggested as higher value something close
* to 5 or 10 minutes.
*
* maxTimeToWait, by default set to 15s, allows to specify an upper bound of time shaping.
* - When you shutdown your application, release all the external resources (except the timer internal itself)
* by calling:
* myHandler.releaseExternalResources();
*
* - In your handler, you should consider to use the {@code channel.isWritable()} and
* {@code channelInterestChanged(ctx, event)} to handle writability, or through
* {@code future.addListener(new ChannelFutureListener())} on the future returned by
* {@code channel.write()}.
* You shall also consider to have object size in read or write operations relatively adapted to
* the bandwidth you required: for instance having 10 MB objects for 10KB/s will lead to burst effect,
* while having 100 KB objects for 1 MB/s should be smoothly handle by this TrafficShaping handler.
Some configuration methods will be taken as best effort, meaning
* that all already scheduled traffics will not be
* changed, but only applied to new traffics.
* So the expected usage of those methods are to be used not too often,
* accordingly to the traffic shaping configuration.
*/
public class ChannelTrafficShapingHandler extends AbstractTrafficShapingHandler {
private final List messagesQueue = new LinkedList();
private long queueSize;
private volatile Timeout writeTimeout;
private volatile ChannelHandlerContext ctx;
public ChannelTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit, long checkInterval) {
super(timer, writeLimit, readLimit, checkInterval);
}
public ChannelTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit, long checkInterval, long maxTime) {
super(timer, writeLimit, readLimit, checkInterval, maxTime);
}
public ChannelTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit) {
super(timer, writeLimit, readLimit);
}
public ChannelTrafficShapingHandler(Timer timer, long checkInterval) {
super(timer, checkInterval);
}
public ChannelTrafficShapingHandler(Timer timer) {
super(timer);
}
public ChannelTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit, long checkInterval) {
super(objectSizeEstimator, timer, writeLimit, readLimit,
checkInterval);
}
public ChannelTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit, long checkInterval, long maxTime) {
super(objectSizeEstimator, timer, writeLimit, readLimit,
checkInterval, maxTime);
}
public ChannelTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit) {
super(objectSizeEstimator, timer, writeLimit, readLimit);
}
public ChannelTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long checkInterval) {
super(objectSizeEstimator, timer, checkInterval);
}
public ChannelTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer) {
super(objectSizeEstimator, timer);
}
private static final class ToSend {
final long relativeTimeAction;
final MessageEvent toSend;
private ToSend(final long delay, final MessageEvent toSend) {
relativeTimeAction = delay;
this.toSend = toSend;
}
}
@Override
void submitWrite(final ChannelHandlerContext ctx, final MessageEvent evt, final long size,
final long delay, final long now) throws Exception {
if (ctx == null) {
this.ctx = ctx;
}
final ToSend newToSend;
Channel channel = ctx.getChannel();
synchronized (this) {
if (delay == 0 && messagesQueue.isEmpty()) {
if (! channel.isConnected()) {
// ignore
return;
}
if (trafficCounter != null) {
trafficCounter.bytesRealWriteFlowControl(size);
}
ctx.sendDownstream(evt);
return;
}
if (timer == null) {
// Sleep since no executor
Thread.sleep(delay);
if (! channel.isConnected()) {
// ignore
return;
}
if (trafficCounter != null) {
trafficCounter.bytesRealWriteFlowControl(size);
}
ctx.sendDownstream(evt);
return;
}
if (! channel.isConnected()) {
// ignore
return;
}
newToSend = new ToSend(delay + now, evt);
messagesQueue.add(newToSend);
queueSize += size;
checkWriteSuspend(ctx, delay, queueSize);
}
final long futureNow = newToSend.relativeTimeAction;
writeTimeout = timer.newTimeout(new TimerTask() {
public void run(Timeout timeout) throws Exception {
sendAllValid(ctx, futureNow);
}
}, delay + 1, TimeUnit.MILLISECONDS);
}
private void sendAllValid(ChannelHandlerContext ctx, final long now) throws Exception {
Channel channel = ctx.getChannel();
if (! channel.isConnected()) {
// ignore
return;
}
synchronized (this) {
while (!messagesQueue.isEmpty()) {
ToSend newToSend = messagesQueue.remove(0);
if (newToSend.relativeTimeAction <= now) {
long size = calculateSize(newToSend.toSend.getMessage());
if (trafficCounter != null) {
trafficCounter.bytesRealWriteFlowControl(size);
}
queueSize -= size;
if (! channel.isConnected()) {
// ignore
break;
}
ctx.sendDownstream(newToSend.toSend);
} else {
messagesQueue.add(0, newToSend);
break;
}
}
if (messagesQueue.isEmpty()) {
releaseWriteSuspended(ctx);
}
}
}
/**
* @return current size in bytes of the write buffer.
*/
public long queueSize() {
return queueSize;
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
throws Exception {
if (trafficCounter != null) {
trafficCounter.stop();
}
synchronized (this) {
messagesQueue.clear();
}
if (writeTimeout != null) {
writeTimeout.cancel();
}
super.channelClosed(ctx, e);
}
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
throws Exception {
this.ctx = ctx;
// readSuspended = true;
ReadWriteStatus rws = checkAttachment(ctx);
rws.readSuspend = true;
ctx.getChannel().setReadable(false);
if (trafficCounter == null) {
// create a new counter now
if (timer != null) {
trafficCounter = new TrafficCounter(this, timer, "ChannelTC" +
ctx.getChannel().getId(), checkInterval);
}
}
if (trafficCounter != null) {
trafficCounter.start();
}
rws.readSuspend = false;
ctx.getChannel().setReadable(true);
super.channelConnected(ctx, e);
}
@Override
public void releaseExternalResources() {
Channel channel = ctx.getChannel();
synchronized (this) {
if (ctx != null && ctx.getChannel().isConnected()) {
for (ToSend toSend : messagesQueue) {
if (! channel.isConnected()) {
// ignore
break;
}
ctx.sendDownstream(toSend.toSend);
}
}
messagesQueue.clear();
}
if (writeTimeout != null) {
writeTimeout.cancel();
}
super.releaseExternalResources();
}
}