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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.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
import org.jboss.netty.util.DefaultObjectSizeEstimator;
import org.jboss.netty.util.ExternalResourceReleasable;
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.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* AbstractTrafficShapingHandler allows to limit the global bandwidth
* (see {@link GlobalTrafficShapingHandler}) or per session
* bandwidth (see {@link ChannelTrafficShapingHandler}), as traffic shaping.
* It allows too to implement an almost real time monitoring of the bandwidth using
* the monitors from {@link TrafficCounter} that will call back every checkInterval
* the method doAccounting of this handler.
*
* An {@link ObjectSizeEstimator} can be passed at construction to specify what
* is the size of the object to be read or write accordingly to the type of
* object. If not specified, it will used the {@link DefaultObjectSizeEstimator} implementation.
*
* If you want for any particular reasons to stop the monitoring (accounting) or to change
* the read/write limit or the check interval, several methods allow that for you:
*
* - configure allows you to change read or write limits, or the checkInterval
* - getTrafficCounter allows you to have access to the TrafficCounter and so to stop
* or start the monitoring, to change the checkInterval directly, or to have access to its values.
*
*/
public abstract class AbstractTrafficShapingHandler extends
SimpleChannelHandler implements ExternalResourceReleasable {
/**
* Internal logger
*/
static InternalLogger logger = InternalLoggerFactory
.getInstance(AbstractTrafficShapingHandler.class);
/**
* Default delay between two checks: 1s
*/
public static final long DEFAULT_CHECK_INTERVAL = 1000;
/**
* Default max delay in case of traffic shaping
* (during which no communication will occur).
* Shall be less than TIMEOUT. Here half of "standard" 30s
*/
public static final long DEFAULT_MAX_TIME = 15000;
/**
* Default max size to not exceed in buffer (write only).
*/
static final long DEFAULT_MAX_SIZE = 4 * 1024 * 1024L;
/**
* Default minimal time to wait
*/
static final long MINIMAL_WAIT = 10;
static final int CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 1;
static final int GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 2;
static final int GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 3;
/**
* Traffic Counter
*/
protected TrafficCounter trafficCounter;
/**
* ObjectSizeEstimator
*/
private ObjectSizeEstimator objectSizeEstimator;
/**
* Timer associated to any TrafficCounter
*/
protected Timer timer;
/**
* used in releaseExternalResources() to cancel the timer
*/
volatile Timeout timeout;
/**
* Limit in B/s to apply to write
*/
private volatile long writeLimit;
/**
* Limit in B/s to apply to read
*/
private volatile long readLimit;
/**
* Delay between two performance snapshots
*/
protected volatile long checkInterval = DEFAULT_CHECK_INTERVAL; // default 1 s
/**
* Max delay in wait
*/
protected volatile long maxTime = DEFAULT_MAX_TIME; // default 15 s
/**
* Max time to delay before proposing to stop writing new objects from next handlers
*/
volatile long maxWriteDelay = 4 * DEFAULT_CHECK_INTERVAL; // default 4 s
/**
* Max size in the list before proposing to stop writing new objects from next handlers
*/
volatile long maxWriteSize = DEFAULT_MAX_SIZE; // default 4MB
/**
* Boolean associated with the release of this TrafficShapingHandler.
* It will be true only once when the releaseExternalRessources is called
* to prevent waiting when shutdown.
*/
final AtomicBoolean release = new AtomicBoolean(false);
final int index;
/**
* Attachment of ChannelHandlerContext
*
*/
static final class ReadWriteStatus {
volatile boolean readSuspend;
volatile TimerTask reopenReadTimerTask;
}
/**
* For simple ChannelBuffer, returns the readableBytes, else
* use standard DefaultObjectSizeEstimator.
*/
public static class SimpleObjectSizeEstimator extends DefaultObjectSizeEstimator {
@Override
public int estimateSize(Object o) {
int size;
if (o instanceof ChannelBuffer) {
size = ((ChannelBuffer) o).readableBytes();
} else {
size = super.estimateSize(o);
}
return size;
}
}
/**
* @return the index to be used by the TrafficShapingHandler to manage the user defined
* writability. For Channel TSH it is defined as
* {@value #CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX}, for Global TSH it is
* defined as {@value #GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX},
* for GlobalChannel TSH it is defined as
* {@value #GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX}.
*/
int userDefinedWritabilityIndex() {
if (this instanceof GlobalChannelTrafficShapingHandler) {
return GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX;
} else if (this instanceof GlobalTrafficShapingHandler) {
return GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX;
} else {
return CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX;
}
}
private void init(ObjectSizeEstimator newObjectSizeEstimator,
Timer newTimer, long newWriteLimit, long newReadLimit,
long newCheckInterval, long newMaxTime) {
if (newMaxTime <= 0) {
throw new IllegalArgumentException("maxTime must be positive");
}
objectSizeEstimator = newObjectSizeEstimator;
timer = newTimer;
writeLimit = newWriteLimit;
readLimit = newReadLimit;
checkInterval = newCheckInterval;
maxTime = newMaxTime;
//logger.warn("TSH: "+writeLimit+":"+readLimit+":"+checkInterval);
}
/**
* @param newTrafficCounter the TrafficCounter to set
*/
void setTrafficCounter(TrafficCounter newTrafficCounter) {
trafficCounter = newTrafficCounter;
}
/**
* Constructor using default {@link ObjectSizeEstimator} and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 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.
*/
protected AbstractTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit, long checkInterval) {
index = userDefinedWritabilityIndex();
init(new SimpleObjectSizeEstimator(), timer, writeLimit, readLimit, checkInterval,
DEFAULT_MAX_TIME);
}
/**
* Constructor using the specified ObjectSizeEstimator and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param objectSizeEstimator
* the {@link ObjectSizeEstimator} that will be used to compute
* the size of the message.
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 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.
*/
protected AbstractTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit, long checkInterval) {
index = userDefinedWritabilityIndex();
init(objectSizeEstimator, timer, writeLimit, readLimit, checkInterval, DEFAULT_MAX_TIME);
}
/**
* Constructor using default {@link ObjectSizeEstimator} and using
* default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 0 or a limit in bytes/s
*/
protected AbstractTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit) {
index = userDefinedWritabilityIndex();
init(new SimpleObjectSizeEstimator(), timer, writeLimit, readLimit,
DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
}
/**
* Constructor using the specified ObjectSizeEstimator and using
* default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param objectSizeEstimator
* the {@link ObjectSizeEstimator} that will be used to compute
* the size of the message.
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 0 or a limit in bytes/s
*/
protected AbstractTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit) {
index = userDefinedWritabilityIndex();
init(objectSizeEstimator, timer, writeLimit, readLimit,
DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
}
/**
* Constructor using default {@link ObjectSizeEstimator} and using NO LIMIT and
* default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
*/
protected AbstractTrafficShapingHandler(Timer timer) {
index = userDefinedWritabilityIndex();
init(new SimpleObjectSizeEstimator(), timer, 0, 0,
DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
}
/**
* Constructor using the specified ObjectSizeEstimator and using NO LIMIT and
* default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param objectSizeEstimator
* the {@link ObjectSizeEstimator} that will be used to compute
* the size of the message.
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
*/
protected AbstractTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer) {
index = userDefinedWritabilityIndex();
init(objectSizeEstimator, timer, 0, 0,
DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
}
/**
* Constructor using default {@link ObjectSizeEstimator} and using NO LIMIT and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param checkInterval
* The delay between two computations of performances for
* channels or 0 if no stats are to be computed.
*/
protected AbstractTrafficShapingHandler(Timer timer, long checkInterval) {
index = userDefinedWritabilityIndex();
init(new SimpleObjectSizeEstimator(), timer, 0, 0, checkInterval, DEFAULT_MAX_TIME);
}
/**
* Constructor using the specified ObjectSizeEstimator and using NO LIMIT and
* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
*
* @param objectSizeEstimator
* the {@link ObjectSizeEstimator} that will be used to compute
* the size of the message.
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param checkInterval
* The delay between two computations of performances for
* channels or 0 if no stats are to be computed.
*/
protected AbstractTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long checkInterval) {
index = userDefinedWritabilityIndex();
init(objectSizeEstimator, timer, 0, 0, checkInterval, DEFAULT_MAX_TIME);
}
/**
* Constructor using default {@link ObjectSizeEstimator}.
*
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 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 max time to wait in case of excess of traffic (to prevent Time Out event).
* Must be positive.
*/
protected AbstractTrafficShapingHandler(Timer timer, long writeLimit,
long readLimit, long checkInterval, long maxTime) {
index = userDefinedWritabilityIndex();
init(new SimpleObjectSizeEstimator(), timer, writeLimit, readLimit, checkInterval,
maxTime);
}
/**
* Constructor using the specified ObjectSizeEstimator.
*
* @param objectSizeEstimator
* the {@link ObjectSizeEstimator} that will be used to compute
* the size of the message.
* @param timer
* created once for instance like HashedWheelTimer(10, TimeUnit.MILLISECONDS, 1024).
* @param writeLimit
* 0 or a limit in bytes/s
* @param readLimit
* 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 max time to wait in case of excess of traffic (to prevent Time Out event).
* Must be positive.
*/
protected AbstractTrafficShapingHandler(
ObjectSizeEstimator objectSizeEstimator, Timer timer,
long writeLimit, long readLimit, long checkInterval, long maxTime) {
index = userDefinedWritabilityIndex();
init(objectSizeEstimator, timer, writeLimit, readLimit, checkInterval, maxTime);
}
/**
* Change the underlying limitations and check interval.
* 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 newWriteLimit
* The new write limit (in bytes)
* @param newReadLimit
* The new read limit (in bytes)
* @param newCheckInterval
* The new check interval (in milliseconds)
*/
public void configure(long newWriteLimit, long newReadLimit,
long newCheckInterval) {
configure(newWriteLimit, newReadLimit);
configure(newCheckInterval);
}
/**
* Change the underlying limitations.
* 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 newWriteLimit
* The new write limit (in bytes)
* @param newReadLimit
* The new read limit (in bytes)
*/
public void configure(long newWriteLimit, long newReadLimit) {
writeLimit = newWriteLimit;
readLimit = newReadLimit;
if (trafficCounter != null) {
trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
}
}
/**
* Change the check interval.
*/
public void configure(long newCheckInterval) {
setCheckInterval(newCheckInterval);
}
/**
* @return the writeLimit
*/
public long getWriteLimit() {
return writeLimit;
}
/**
* 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 writeLimit the writeLimit to set
*/
public void setWriteLimit(long writeLimit) {
this.writeLimit = writeLimit;
if (trafficCounter != null) {
trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
}
}
/**
* @return the readLimit
*/
public long getReadLimit() {
return readLimit;
}
/**
* 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 readLimit the readLimit to set
*/
public void setReadLimit(long readLimit) {
this.readLimit = readLimit;
if (trafficCounter != null) {
trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
}
}
/**
* @return the checkInterval
*/
public long getCheckInterval() {
return checkInterval;
}
/**
* @param newCheckInterval the checkInterval to set
*/
public void setCheckInterval(long newCheckInterval) {
checkInterval = newCheckInterval;
if (trafficCounter != null) {
trafficCounter.configure(checkInterval);
}
}
/**
* @return the max delay on wait
*/
public long getMaxTimeWait() {
return maxTime;
}
/**
* 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 maxTime
* Max delay in wait, shall be less than TIME OUT in related protocol.
* Must be positive.
*/
public void setMaxTimeWait(long maxTime) {
if (maxTime <= 0) {
throw new IllegalArgumentException("maxTime must be positive");
}
this.maxTime = maxTime;
}
/**
* @return the maxWriteDelay
*/
public long getMaxWriteDelay() {
return maxWriteDelay;
}
/**
* 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 maxWriteDelay the maximum Write Delay in ms in the buffer allowed before write suspended is set.
* Must be positive.
*/
public void setMaxWriteDelay(long maxWriteDelay) {
if (maxWriteDelay <= 0) {
throw new IllegalArgumentException("maxWriteDelay must be positive");
}
this.maxWriteDelay = maxWriteDelay;
}
/**
* @return the maxWriteSize default being {@value #DEFAULT_MAX_SIZE} bytes
*/
public long getMaxWriteSize() {
return maxWriteSize;
}
/**
* 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 maxWriteSize the maximum Write Size allowed in the buffer
* per channel before write suspended is set,
* default being {@value #DEFAULT_MAX_SIZE} bytes
*/
public void setMaxWriteSize(long maxWriteSize) {
this.maxWriteSize = maxWriteSize;
}
/**
* Called each time the accounting is computed from the TrafficCounters.
* This method could be used for instance to implement almost real time accounting.
*
* @param counter
* the TrafficCounter that computes its performance
*/
protected void doAccounting(TrafficCounter counter) {
// NOOP by default
}
/**
* Class to implement setReadable at fix time.
*/
class ReopenReadTimerTask implements TimerTask {
final ChannelHandlerContext ctx;
ReopenReadTimerTask(ChannelHandlerContext ctx) {
this.ctx = ctx;
}
public void run(Timeout timeoutArg) throws Exception {
//logger.warn("Start RRTT: "+release.get());
if (release.get()) {
return;
}
ReadWriteStatus rws = checkAttachment(ctx);
Channel channel = ctx.getChannel();
if (! channel.isConnected()) {
// ignore
return;
}
if (!channel.isReadable() && ! rws.readSuspend) {
// If isReadable is False and Active is True, user make a direct setReadable(false)
// Then Just reset the status
if (logger.isDebugEnabled()) {
logger.debug("Not unsuspend: " + channel.isReadable() + ':' +
rws.readSuspend);
}
rws.readSuspend = false;
} else {
// Anything else allows the handler to reset the AutoRead
if (logger.isDebugEnabled()) {
if (channel.isReadable() && rws.readSuspend) {
logger.debug("Unsuspend: " + channel.isReadable() + ':' +
rws.readSuspend);
} else {
logger.debug("Normal unsuspend: " + channel.isReadable() + ':' +
rws.readSuspend);
}
}
rws.readSuspend = false;
channel.setReadable(true);
}
if (logger.isDebugEnabled()) {
logger.debug("Unsupsend final status => " + channel.isReadable() + ':' +
rws.readSuspend);
}
}
}
/**
* Release the Read suspension.
*/
void releaseReadSuspended(ChannelHandlerContext ctx) {
ReadWriteStatus rws = checkAttachment(ctx);
rws.readSuspend = false;
ctx.getChannel().setReadable(true);
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent evt)
throws Exception {
long now = TrafficCounter.milliSecondFromNano();
try {
ReadWriteStatus rws = checkAttachment(ctx);
long size = calculateSize(evt.getMessage());
if (size > 0 && trafficCounter != null) {
// compute the number of ms to wait before reopening the channel
long wait = trafficCounter.readTimeToWait(size, readLimit, maxTime, now);
wait = checkWaitReadTime(ctx, wait, now);
if (wait >= MINIMAL_WAIT) { // At least 10ms seems a minimal
// time in order to try to limit the traffic
if (release.get()) {
return;
}
Channel channel = ctx.getChannel();
if (channel != null && channel.isConnected()) {
// Only AutoRead AND HandlerActive True means Context Active
if (logger.isDebugEnabled()) {
logger.debug("Read suspend: " + wait + ':' + channel.isReadable() + ':' +
rws.readSuspend);
}
if (timer == null) {
// Sleep since no executor
// logger.warn("Read sleep since no timer for "+wait+" ms for "+this);
Thread.sleep(wait);
return;
}
if (channel.isReadable() && ! rws.readSuspend) {
rws.readSuspend = true;
channel.setReadable(false);
if (logger.isDebugEnabled()) {
logger.debug("Suspend final status => " + channel.isReadable() + ':' +
rws.readSuspend);
}
// Create a Runnable to reactive the read if needed. If one was create before
// it will just be reused to limit object creation
if (rws.reopenReadTimerTask == null) {
rws.reopenReadTimerTask = new ReopenReadTimerTask(ctx);
}
timeout = timer.newTimeout(rws.reopenReadTimerTask, wait,
TimeUnit.MILLISECONDS);
}
}
}
}
} finally {
informReadOperation(ctx, now);
// The message is then just passed to the next handler
ctx.sendUpstream(evt);
}
}
/**
* Method overridden in GTSH to take into account specific timer for the channel.
* @param wait the wait delay computed in ms
* @param now the relative now time in ms
* @return the wait to use according to the context.
*/
long checkWaitReadTime(final ChannelHandlerContext ctx, long wait, final long now) {
// no change by default
return wait;
}
/**
* Method overridden in GTSH to take into account specific timer for the channel.
* @param now the relative now time in ms
*/
void informReadOperation(final ChannelHandlerContext ctx, final long now) {
// default noop
}
@Override
public void writeRequested(ChannelHandlerContext ctx, MessageEvent evt)
throws Exception {
long wait = 0;
long size = calculateSize(evt.getMessage());
long now = TrafficCounter.milliSecondFromNano();
Channel channel = ctx.getChannel();
try {
if (size > 0 && trafficCounter != null) {
// compute the number of ms to wait before continue with the channel
wait = trafficCounter.writeTimeToWait(size, writeLimit, maxTime, now);
if (logger.isDebugEnabled()) {
logger.debug("Write suspend: " + wait + ':' + channel.isWritable() + ':' +
channel.getUserDefinedWritability(index));
}
if (wait < MINIMAL_WAIT || release.get()) {
wait = 0;
}
}
} finally {
// The message is scheduled
submitWrite(ctx, evt, size, wait, now);
}
}
@Deprecated
protected void internalSubmitWrite(ChannelHandlerContext ctx, MessageEvent evt) throws Exception {
ctx.sendDownstream(evt);
}
@Deprecated
protected void submitWrite(final ChannelHandlerContext ctx, final MessageEvent evt,
final long delay) throws Exception {
submitWrite(ctx, evt, calculateSize(evt.getMessage()), delay, TrafficCounter.milliSecondFromNano());
}
abstract void submitWrite(ChannelHandlerContext ctx, MessageEvent evt, long size,
long delay, long now) throws Exception;
void setWritable(ChannelHandlerContext ctx, boolean writable) {
Channel channel = ctx.getChannel();
if (channel.isConnected()) {
channel.setUserDefinedWritability(index, writable);
}
}
/**
* Check the writability according to delay and size for the channel.
* Set if necessary the write suspended status.
* @param delay the computed delai
* @param queueSize the current queueSize
*/
void checkWriteSuspend(ChannelHandlerContext ctx, long delay, long queueSize) {
if (queueSize > maxWriteSize || delay > maxWriteDelay) {
setWritable(ctx, false);
}
}
/**
* Explicitly release the Write suspended status.
*/
void releaseWriteSuspended(ChannelHandlerContext ctx) {
setWritable(ctx, true);
}
/**
* @return the current TrafficCounter (if
* channel is still connected).
*/
public TrafficCounter getTrafficCounter() {
return trafficCounter;
}
public void releaseExternalResources() {
if (trafficCounter != null) {
trafficCounter.stop();
}
release.set(true);
if (timeout != null) {
timeout.cancel();
}
//shall be done outside (since it can be shared): timer.stop();
}
static ReadWriteStatus checkAttachment(ChannelHandlerContext ctx) {
ReadWriteStatus rws = (ReadWriteStatus) ctx.getAttachment();
if (rws == null) {
rws = new ReadWriteStatus();
ctx.setAttachment(rws);
}
return rws;
}
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
checkAttachment(ctx);
setWritable(ctx, true);
super.channelConnected(ctx, e);
}
protected long calculateSize(Object obj) {
//logger.debug("Size: "+size);
return objectSizeEstimator.estimateSize(obj);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder(290)
.append("TrafficShaping with Write Limit: ").append(writeLimit)
.append(" Read Limit: ").append(readLimit)
.append(" CheckInterval: ").append(checkInterval)
.append(" maxDelay: ").append(maxWriteDelay)
.append(" maxSize: ").append(maxWriteSize)
.append(" and Counter: ");
if (trafficCounter != null) {
builder.append(trafficCounter);
} else {
builder.append("none");
}
return builder.toString();
}
}