io.netty.handler.traffic.GlobalChannelTrafficShapingHandler Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2014 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:
*
* https://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 io.netty.handler.traffic;
import static io.netty.util.internal.ObjectUtil.checkNotNullWithIAE;
import static io.netty.util.internal.ObjectUtil.checkPositive;
import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.util.Attribute;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.util.AbstractCollection;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Iterator;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
* This implementation of the {@link AbstractTrafficShapingHandler} is for global
* and per channel traffic shaping, that is to say a global limitation of the bandwidth, whatever
* the number of opened channels and a per channel limitation of the bandwidth.
* This version shall not be in the same pipeline than other TrafficShapingHandler.
*
* The general use should be as follow:
*
* - Create your unique GlobalChannelTrafficShapingHandler like:
* GlobalChannelTrafficShapingHandler myHandler = new GlobalChannelTrafficShapingHandler(executor);
* The executor could be the underlying IO worker pool
* pipeline.addLast(myHandler);
*
* Note that this handler has a Pipeline Coverage of "all" which means only one such handler must be created
* and shared among all channels as the counter must be shared among all channels.
*
* 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).
* Note that as this is a fusion of both Global and Channel Traffic Shaping, limits are in 2 sets,
* respectively Global and Channel.
*
* 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.
*
* - In your handler, you should consider to use the {@code channel.isWritable()} and
* {@code channelWritabilityChanged(ctx)} to handle writability, or through
* {@code future.addListener(new GenericFutureListener())} on the future returned by
* {@code ctx.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.
*
*
* Be sure to call {@link #release()} once this handler is not needed anymore to release all internal resources.
* This will not shutdown the {@link EventExecutor} as it may be shared, so you need to do this by your own.
*/
@Sharable
public class GlobalChannelTrafficShapingHandler extends AbstractTrafficShapingHandler {
private static final InternalLogger logger =
InternalLoggerFactory.getInstance(GlobalChannelTrafficShapingHandler.class);
/**
* All queues per channel
*/
final ConcurrentMap channelQueues = PlatformDependent.newConcurrentHashMap();
/**
* Global queues size
*/
private final AtomicLong queuesSize = new AtomicLong();
/**
* Maximum cumulative writing bytes for one channel among all (as long as channels stay the same)
*/
private final AtomicLong cumulativeWrittenBytes = new AtomicLong();
/**
* Maximum cumulative read bytes for one channel among all (as long as channels stay the same)
*/
private final AtomicLong cumulativeReadBytes = new AtomicLong();
/**
* Max size in the list before proposing to stop writing new objects from next handlers
* for all channel (global)
*/
volatile long maxGlobalWriteSize = DEFAULT_MAX_SIZE * 100; // default 400MB
/**
* Limit in B/s to apply to write
*/
private volatile long writeChannelLimit;
/**
* Limit in B/s to apply to read
*/
private volatile long readChannelLimit;
private static final float DEFAULT_DEVIATION = 0.1F;
private static final float MAX_DEVIATION = 0.4F;
private static final float DEFAULT_SLOWDOWN = 0.4F;
private static final float DEFAULT_ACCELERATION = -0.1F;
private volatile float maxDeviation;
private volatile float accelerationFactor;
private volatile float slowDownFactor;
private volatile boolean readDeviationActive;
private volatile boolean writeDeviationActive;
static final class PerChannel {
ArrayDeque messagesQueue;
TrafficCounter channelTrafficCounter;
long queueSize;
long lastWriteTimestamp;
long lastReadTimestamp;
}
/**
* Create the global TrafficCounter
*/
void createGlobalTrafficCounter(ScheduledExecutorService executor) {
// Default
setMaxDeviation(DEFAULT_DEVIATION, DEFAULT_SLOWDOWN, DEFAULT_ACCELERATION);
checkNotNullWithIAE(executor, "executor");
TrafficCounter tc = new GlobalChannelTrafficCounter(this, executor, "GlobalChannelTC", checkInterval);
setTrafficCounter(tc);
tc.start();
}
@Override
protected int userDefinedWritabilityIndex() {
return AbstractTrafficShapingHandler.GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX;
}
/**
* Create a new instance.
*
* @param executor
* the {@link ScheduledExecutorService} to use for the {@link TrafficCounter}.
* @param writeGlobalLimit
* 0 or a limit in bytes/s
* @param readGlobalLimit
* 0 or a limit in bytes/s
* @param writeChannelLimit
* 0 or a limit in bytes/s
* @param readChannelLimit
* 0 or a limit in bytes/s
* @param checkInterval
* The delay between two computations of performances for
* channels or 0 if no stats are to be computed.
* @param maxTime
* The maximum delay to wait in case of traffic excess.
*/
public GlobalChannelTrafficShapingHandler(ScheduledExecutorService executor,
long writeGlobalLimit, long readGlobalLimit,
long writeChannelLimit, long readChannelLimit,
long checkInterval, long maxTime) {
super(writeGlobalLimit, readGlobalLimit, checkInterval, maxTime);
createGlobalTrafficCounter(executor);
this.writeChannelLimit = writeChannelLimit;
this.readChannelLimit = readChannelLimit;
}
/**
* Create a new instance.
*
* @param executor
* the {@link ScheduledExecutorService} to use for the {@link TrafficCounter}.
* @param writeGlobalLimit
* 0 or a limit in bytes/s
* @param readGlobalLimit
* 0 or a limit in bytes/s
* @param writeChannelLimit
* 0 or a limit in bytes/s
* @param readChannelLimit
* 0 or a limit in bytes/s
* @param checkInterval
* The delay between two computations of performances for
* channels or 0 if no stats are to be computed.
*/
public GlobalChannelTrafficShapingHandler(ScheduledExecutorService executor,
long writeGlobalLimit, long readGlobalLimit,
long writeChannelLimit, long readChannelLimit,
long checkInterval) {
super(writeGlobalLimit, readGlobalLimit, checkInterval);
this.writeChannelLimit = writeChannelLimit;
this.readChannelLimit = readChannelLimit;
createGlobalTrafficCounter(executor);
}
/**
* Create a new instance.
*
* @param executor
* the {@link ScheduledExecutorService} to use for the {@link TrafficCounter}.
* @param writeGlobalLimit
* 0 or a limit in bytes/s
* @param readGlobalLimit
* 0 or a limit in bytes/s
* @param writeChannelLimit
* 0 or a limit in bytes/s
* @param readChannelLimit
* 0 or a limit in bytes/s
*/
public GlobalChannelTrafficShapingHandler(ScheduledExecutorService executor,
long writeGlobalLimit, long readGlobalLimit,
long writeChannelLimit, long readChannelLimit) {
super(writeGlobalLimit, readGlobalLimit);
this.writeChannelLimit = writeChannelLimit;
this.readChannelLimit = readChannelLimit;
createGlobalTrafficCounter(executor);
}
/**
* Create a new instance.
*
* @param executor
* the {@link ScheduledExecutorService} to use for the {@link TrafficCounter}.
* @param checkInterval
* The delay between two computations of performances for
* channels or 0 if no stats are to be computed.
*/
public GlobalChannelTrafficShapingHandler(ScheduledExecutorService executor, long checkInterval) {
super(checkInterval);
createGlobalTrafficCounter(executor);
}
/**
* Create a new instance.
*
* @param executor
* the {@link ScheduledExecutorService} to use for the {@link TrafficCounter}.
*/
public GlobalChannelTrafficShapingHandler(ScheduledExecutorService executor) {
createGlobalTrafficCounter(executor);
}
/**
* @return the current max deviation
*/
public float maxDeviation() {
return maxDeviation;
}
/**
* @return the current acceleration factor
*/
public float accelerationFactor() {
return accelerationFactor;
}
/**
* @return the current slow down factor
*/
public float slowDownFactor() {
return slowDownFactor;
}
/**
* @param maxDeviation
* the maximum deviation to allow during computation of average, default deviation
* being 0.1, so +/-10% of the desired bandwidth. Maximum being 0.4.
* @param slowDownFactor
* the factor set as +x% to the too fast client (minimal value being 0, meaning no
* slow down factor), default being 40% (0.4).
* @param accelerationFactor
* the factor set as -x% to the too slow client (maximal value being 0, meaning no
* acceleration factor), default being -10% (-0.1).
*/
public void setMaxDeviation(float maxDeviation, float slowDownFactor, float accelerationFactor) {
if (maxDeviation > MAX_DEVIATION) {
throw new IllegalArgumentException("maxDeviation must be <= " + MAX_DEVIATION);
}
checkPositiveOrZero(slowDownFactor, "slowDownFactor");
if (accelerationFactor > 0) {
throw new IllegalArgumentException("accelerationFactor must be <= 0");
}
this.maxDeviation = maxDeviation;
this.accelerationFactor = 1 + accelerationFactor;
this.slowDownFactor = 1 + slowDownFactor;
}
private void computeDeviationCumulativeBytes() {
// compute the maximum cumulativeXxxxBytes among still connected Channels
long maxWrittenBytes = 0;
long maxReadBytes = 0;
long minWrittenBytes = Long.MAX_VALUE;
long minReadBytes = Long.MAX_VALUE;
for (PerChannel perChannel : channelQueues.values()) {
long value = perChannel.channelTrafficCounter.cumulativeWrittenBytes();
if (maxWrittenBytes < value) {
maxWrittenBytes = value;
}
if (minWrittenBytes > value) {
minWrittenBytes = value;
}
value = perChannel.channelTrafficCounter.cumulativeReadBytes();
if (maxReadBytes < value) {
maxReadBytes = value;
}
if (minReadBytes > value) {
minReadBytes = value;
}
}
boolean multiple = channelQueues.size() > 1;
readDeviationActive = multiple && minReadBytes < maxReadBytes / 2;
writeDeviationActive = multiple && minWrittenBytes < maxWrittenBytes / 2;
cumulativeWrittenBytes.set(maxWrittenBytes);
cumulativeReadBytes.set(maxReadBytes);
}
@Override
protected void doAccounting(TrafficCounter counter) {
computeDeviationCumulativeBytes();
super.doAccounting(counter);
}
private long computeBalancedWait(float maxLocal, float maxGlobal, long wait) {
if (maxGlobal == 0) {
// no change
return wait;
}
float ratio = maxLocal / maxGlobal;
// if in the boundaries, same value
if (ratio > maxDeviation) {
if (ratio < 1 - maxDeviation) {
return wait;
} else {
ratio = slowDownFactor;
if (wait < MINIMAL_WAIT) {
wait = MINIMAL_WAIT;
}
}
} else {
ratio = accelerationFactor;
}
return (long) (wait * ratio);
}
/**
* @return the maxGlobalWriteSize
*/
public long getMaxGlobalWriteSize() {
return maxGlobalWriteSize;
}
/**
* Note the change 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 this method is to be used not too often,
* accordingly to the traffic shaping configuration.
*
* @param maxGlobalWriteSize the maximum Global Write Size allowed in the buffer
* globally for all channels before write suspended is set.
*/
public void setMaxGlobalWriteSize(long maxGlobalWriteSize) {
this.maxGlobalWriteSize = checkPositive(maxGlobalWriteSize, "maxGlobalWriteSize");
}
/**
* @return the global size of the buffers for all queues.
*/
public long queuesSize() {
return queuesSize.get();
}
/**
* @param newWriteLimit Channel write limit
* @param newReadLimit Channel read limit
*/
public void configureChannel(long newWriteLimit, long newReadLimit) {
writeChannelLimit = newWriteLimit;
readChannelLimit = newReadLimit;
long now = TrafficCounter.milliSecondFromNano();
for (PerChannel perChannel : channelQueues.values()) {
perChannel.channelTrafficCounter.resetAccounting(now);
}
}
/**
* @return Channel write limit
*/
public long getWriteChannelLimit() {
return writeChannelLimit;
}
/**
* @param writeLimit Channel write limit
*/
public void setWriteChannelLimit(long writeLimit) {
writeChannelLimit = writeLimit;
long now = TrafficCounter.milliSecondFromNano();
for (PerChannel perChannel : channelQueues.values()) {
perChannel.channelTrafficCounter.resetAccounting(now);
}
}
/**
* @return Channel read limit
*/
public long getReadChannelLimit() {
return readChannelLimit;
}
/**
* @param readLimit Channel read limit
*/
public void setReadChannelLimit(long readLimit) {
readChannelLimit = readLimit;
long now = TrafficCounter.milliSecondFromNano();
for (PerChannel perChannel : channelQueues.values()) {
perChannel.channelTrafficCounter.resetAccounting(now);
}
}
/**
* Release all internal resources of this instance.
*/
public final void release() {
trafficCounter.stop();
}
private PerChannel getOrSetPerChannel(ChannelHandlerContext ctx) {
// ensure creation is limited to one thread per channel
Channel channel = ctx.channel();
Integer key = channel.hashCode();
PerChannel perChannel = channelQueues.get(key);
if (perChannel == null) {
perChannel = new PerChannel();
perChannel.messagesQueue = new ArrayDeque();
// Don't start it since managed through the Global one
perChannel.channelTrafficCounter = new TrafficCounter(this, null, "ChannelTC" +
ctx.channel().hashCode(), checkInterval);
perChannel.queueSize = 0L;
perChannel.lastReadTimestamp = TrafficCounter.milliSecondFromNano();
perChannel.lastWriteTimestamp = perChannel.lastReadTimestamp;
channelQueues.put(key, perChannel);
}
return perChannel;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
getOrSetPerChannel(ctx);
trafficCounter.resetCumulativeTime();
super.handlerAdded(ctx);
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
trafficCounter.resetCumulativeTime();
Channel channel = ctx.channel();
Integer key = channel.hashCode();
PerChannel perChannel = channelQueues.remove(key);
if (perChannel != null) {
// write operations need synchronization
synchronized (perChannel) {
if (channel.isActive()) {
for (ToSend toSend : perChannel.messagesQueue) {
long size = calculateSize(toSend.toSend);
trafficCounter.bytesRealWriteFlowControl(size);
perChannel.channelTrafficCounter.bytesRealWriteFlowControl(size);
perChannel.queueSize -= size;
queuesSize.addAndGet(-size);
ctx.write(toSend.toSend, toSend.promise);
}
} else {
queuesSize.addAndGet(-perChannel.queueSize);
for (ToSend toSend : perChannel.messagesQueue) {
if (toSend.toSend instanceof ByteBuf) {
((ByteBuf) toSend.toSend).release();
}
}
}
perChannel.messagesQueue.clear();
}
}
releaseWriteSuspended(ctx);
releaseReadSuspended(ctx);
super.handlerRemoved(ctx);
}
@Override
public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
long size = calculateSize(msg);
long now = TrafficCounter.milliSecondFromNano();
if (size > 0) {
// compute the number of ms to wait before reopening the channel
long waitGlobal = trafficCounter.readTimeToWait(size, getReadLimit(), maxTime, now);
Integer key = ctx.channel().hashCode();
PerChannel perChannel = channelQueues.get(key);
long wait = 0;
if (perChannel != null) {
wait = perChannel.channelTrafficCounter.readTimeToWait(size, readChannelLimit, maxTime, now);
if (readDeviationActive) {
// now try to balance between the channels
long maxLocalRead;
maxLocalRead = perChannel.channelTrafficCounter.cumulativeReadBytes();
long maxGlobalRead = cumulativeReadBytes.get();
if (maxLocalRead <= 0) {
maxLocalRead = 0;
}
if (maxGlobalRead < maxLocalRead) {
maxGlobalRead = maxLocalRead;
}
wait = computeBalancedWait(maxLocalRead, maxGlobalRead, wait);
}
}
if (wait < waitGlobal) {
wait = waitGlobal;
}
wait = checkWaitReadTime(ctx, wait, now);
if (wait >= MINIMAL_WAIT) { // At least 10ms seems a minimal
// time in order to try to limit the traffic
// Only AutoRead AND HandlerActive True means Context Active
Channel channel = ctx.channel();
ChannelConfig config = channel.config();
if (logger.isDebugEnabled()) {
logger.debug("Read Suspend: " + wait + ':' + config.isAutoRead() + ':'
+ isHandlerActive(ctx));
}
if (config.isAutoRead() && isHandlerActive(ctx)) {
config.setAutoRead(false);
channel.attr(READ_SUSPENDED).set(true);
// Create a Runnable to reactive the read if needed. If one was create before it will just be
// reused to limit object creation
Attribute attr = channel.attr(REOPEN_TASK);
Runnable reopenTask = attr.get();
if (reopenTask == null) {
reopenTask = new ReopenReadTimerTask(ctx);
attr.set(reopenTask);
}
ctx.executor().schedule(reopenTask, wait, TimeUnit.MILLISECONDS);
if (logger.isDebugEnabled()) {
logger.debug("Suspend final status => " + config.isAutoRead() + ':'
+ isHandlerActive(ctx) + " will reopened at: " + wait);
}
}
}
}
informReadOperation(ctx, now);
ctx.fireChannelRead(msg);
}
@Override
protected long checkWaitReadTime(final ChannelHandlerContext ctx, long wait, final long now) {
Integer key = ctx.channel().hashCode();
PerChannel perChannel = channelQueues.get(key);
if (perChannel != null) {
if (wait > maxTime && now + wait - perChannel.lastReadTimestamp > maxTime) {
wait = maxTime;
}
}
return wait;
}
@Override
protected void informReadOperation(final ChannelHandlerContext ctx, final long now) {
Integer key = ctx.channel().hashCode();
PerChannel perChannel = channelQueues.get(key);
if (perChannel != null) {
perChannel.lastReadTimestamp = now;
}
}
private static final class ToSend {
final long relativeTimeAction;
final Object toSend;
final ChannelPromise promise;
final long size;
private ToSend(final long delay, final Object toSend, final long size, final ChannelPromise promise) {
relativeTimeAction = delay;
this.toSend = toSend;
this.size = size;
this.promise = promise;
}
}
protected long maximumCumulativeWrittenBytes() {
return cumulativeWrittenBytes.get();
}
protected long maximumCumulativeReadBytes() {
return cumulativeReadBytes.get();
}
/**
* To allow for instance doAccounting to use the TrafficCounter per channel.
* @return the list of TrafficCounters that exists at the time of the call.
*/
public Collection channelTrafficCounters() {
return new AbstractCollection() {
@Override
public Iterator iterator() {
return new Iterator() {
final Iterator iter = channelQueues.values().iterator();
@Override
public boolean hasNext() {
return iter.hasNext();
}
@Override
public TrafficCounter next() {
return iter.next().channelTrafficCounter;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public int size() {
return channelQueues.size();
}
};
}
@Override
public void write(final ChannelHandlerContext ctx, final Object msg, final ChannelPromise promise)
throws Exception {
long size = calculateSize(msg);
long now = TrafficCounter.milliSecondFromNano();
if (size > 0) {
// compute the number of ms to wait before continue with the channel
long waitGlobal = trafficCounter.writeTimeToWait(size, getWriteLimit(), maxTime, now);
Integer key = ctx.channel().hashCode();
PerChannel perChannel = channelQueues.get(key);
long wait = 0;
if (perChannel != null) {
wait = perChannel.channelTrafficCounter.writeTimeToWait(size, writeChannelLimit, maxTime, now);
if (writeDeviationActive) {
// now try to balance between the channels
long maxLocalWrite;
maxLocalWrite = perChannel.channelTrafficCounter.cumulativeWrittenBytes();
long maxGlobalWrite = cumulativeWrittenBytes.get();
if (maxLocalWrite <= 0) {
maxLocalWrite = 0;
}
if (maxGlobalWrite < maxLocalWrite) {
maxGlobalWrite = maxLocalWrite;
}
wait = computeBalancedWait(maxLocalWrite, maxGlobalWrite, wait);
}
}
if (wait < waitGlobal) {
wait = waitGlobal;
}
if (wait >= MINIMAL_WAIT) {
if (logger.isDebugEnabled()) {
logger.debug("Write suspend: " + wait + ':' + ctx.channel().config().isAutoRead() + ':'
+ isHandlerActive(ctx));
}
submitWrite(ctx, msg, size, wait, now, promise);
return;
}
}
// to maintain order of write
submitWrite(ctx, msg, size, 0, now, promise);
}
@Override
protected void submitWrite(final ChannelHandlerContext ctx, final Object msg,
final long size, final long writedelay, final long now,
final ChannelPromise promise) {
Channel channel = ctx.channel();
Integer key = channel.hashCode();
PerChannel perChannel = channelQueues.get(key);
if (perChannel == null) {
// in case write occurs before handlerAdded is raised for this handler
// imply a synchronized only if needed
perChannel = getOrSetPerChannel(ctx);
}
final ToSend newToSend;
long delay = writedelay;
boolean globalSizeExceeded = false;
// write operations need synchronization
synchronized (perChannel) {
if (writedelay == 0 && perChannel.messagesQueue.isEmpty()) {
trafficCounter.bytesRealWriteFlowControl(size);
perChannel.channelTrafficCounter.bytesRealWriteFlowControl(size);
ctx.write(msg, promise);
perChannel.lastWriteTimestamp = now;
return;
}
if (delay > maxTime && now + delay - perChannel.lastWriteTimestamp > maxTime) {
delay = maxTime;
}
newToSend = new ToSend(delay + now, msg, size, promise);
perChannel.messagesQueue.addLast(newToSend);
perChannel.queueSize += size;
queuesSize.addAndGet(size);
checkWriteSuspend(ctx, delay, perChannel.queueSize);
if (queuesSize.get() > maxGlobalWriteSize) {
globalSizeExceeded = true;
}
}
if (globalSizeExceeded) {
setUserDefinedWritability(ctx, false);
}
final long futureNow = newToSend.relativeTimeAction;
final PerChannel forSchedule = perChannel;
ctx.executor().schedule(new Runnable() {
@Override
public void run() {
sendAllValid(ctx, forSchedule, futureNow);
}
}, delay, TimeUnit.MILLISECONDS);
}
private void sendAllValid(final ChannelHandlerContext ctx, final PerChannel perChannel, final long now) {
// write operations need synchronization
synchronized (perChannel) {
ToSend newToSend = perChannel.messagesQueue.pollFirst();
for (; newToSend != null; newToSend = perChannel.messagesQueue.pollFirst()) {
if (newToSend.relativeTimeAction <= now) {
long size = newToSend.size;
trafficCounter.bytesRealWriteFlowControl(size);
perChannel.channelTrafficCounter.bytesRealWriteFlowControl(size);
perChannel.queueSize -= size;
queuesSize.addAndGet(-size);
ctx.write(newToSend.toSend, newToSend.promise);
perChannel.lastWriteTimestamp = now;
} else {
perChannel.messagesQueue.addFirst(newToSend);
break;
}
}
if (perChannel.messagesQueue.isEmpty()) {
releaseWriteSuspended(ctx);
}
}
ctx.flush();
}
@Override
public String toString() {
return new StringBuilder(340).append(super.toString())
.append(" Write Channel Limit: ").append(writeChannelLimit)
.append(" Read Channel Limit: ").append(readChannelLimit).toString();
}
}