Class ChannelTrafficShapingHandler
- All Implemented Interfaces:
ChannelDownstreamHandler
,ChannelHandler
,ChannelUpstreamHandler
,ExternalResourceReleasable
This implementation of the AbstractTrafficShapingHandler
is for channel
traffic shaping, that is to say a per channel limitation of the bandwidth.
Add in your pipeline a new ChannelTrafficShapingHandler, before a recommended
ExecutionHandler
(likeOrderedMemoryAwareThreadPoolExecutor
orMemoryAwareThreadPoolExecutor
).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
ChannelPipelineFactory
, you should create a new ChannelTrafficShapingHandler in thisChannelPipelineFactory
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
channel.isWritable()
andchannelInterestChanged(ctx, event)
to handle writability, or throughfuture.addListener(new ChannelFutureListener())
on the future returned bychannel.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.
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Nested Class Summary
Nested ClassesNested classes/interfaces inherited from class org.jboss.netty.handler.traffic.AbstractTrafficShapingHandler
AbstractTrafficShapingHandler.ReadWriteStatus, AbstractTrafficShapingHandler.ReopenReadTimerTask, AbstractTrafficShapingHandler.SimpleObjectSizeEstimator
Nested classes/interfaces inherited from interface org.jboss.netty.channel.ChannelHandler
ChannelHandler.Sharable
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate ChannelHandlerContext
private final List
<ChannelTrafficShapingHandler.ToSend> private long
private Timeout
Fields inherited from class org.jboss.netty.handler.traffic.AbstractTrafficShapingHandler
CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX, checkInterval, DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_SIZE, DEFAULT_MAX_TIME, GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX, GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX, index, logger, maxTime, maxWriteDelay, maxWriteSize, MINIMAL_WAIT, release, timeout, timer, trafficCounter
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Constructor Summary
ConstructorsConstructorDescriptionChannelTrafficShapingHandler
(ObjectSizeEstimator objectSizeEstimator, Timer timer) ChannelTrafficShapingHandler
(ObjectSizeEstimator objectSizeEstimator, Timer timer, long checkInterval) ChannelTrafficShapingHandler
(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit) ChannelTrafficShapingHandler
(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit, long checkInterval) ChannelTrafficShapingHandler
(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit, long checkInterval, long maxTime) ChannelTrafficShapingHandler
(Timer timer, long checkInterval) ChannelTrafficShapingHandler
(Timer timer, long writeLimit, long readLimit) ChannelTrafficShapingHandler
(Timer timer, long writeLimit, long readLimit, long checkInterval) ChannelTrafficShapingHandler
(Timer timer, long writeLimit, long readLimit, long checkInterval, long maxTime) -
Method Summary
Modifier and TypeMethodDescriptionvoid
Invoked when aChannel
was closed and all its related resources were released.void
Invoked when aChannel
is open, bound to a local address, and connected to a remote address.long
void
Releases the external resources that this object depends on.private void
sendAllValid
(ChannelHandlerContext ctx, long now) (package private) void
submitWrite
(ChannelHandlerContext ctx, MessageEvent evt, long size, long delay, long now) Methods inherited from class org.jboss.netty.handler.traffic.AbstractTrafficShapingHandler
calculateSize, checkAttachment, checkWaitReadTime, checkWriteSuspend, configure, configure, configure, doAccounting, getCheckInterval, getMaxTimeWait, getMaxWriteDelay, getMaxWriteSize, getReadLimit, getTrafficCounter, getWriteLimit, informReadOperation, internalSubmitWrite, messageReceived, releaseReadSuspended, releaseWriteSuspended, setCheckInterval, setMaxTimeWait, setMaxWriteDelay, setMaxWriteSize, setReadLimit, setTrafficCounter, setWritable, setWriteLimit, submitWrite, toString, userDefinedWritabilityIndex, writeRequested
Methods inherited from class org.jboss.netty.channel.SimpleChannelHandler
bindRequested, channelBound, channelDisconnected, channelInterestChanged, channelOpen, channelUnbound, childChannelClosed, childChannelOpen, closeRequested, connectRequested, disconnectRequested, exceptionCaught, handleDownstream, handleUpstream, setInterestOpsRequested, unbindRequested, writeComplete
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Field Details
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messagesQueue
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queueSize
private long queueSize -
writeTimeout
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ctx
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Constructor Details
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ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(Timer timer, long writeLimit, long readLimit, long checkInterval) -
ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(Timer timer, long writeLimit, long readLimit, long checkInterval, long maxTime) -
ChannelTrafficShapingHandler
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ChannelTrafficShapingHandler
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ChannelTrafficShapingHandler
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ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit, long checkInterval) -
ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit, long checkInterval, long maxTime) -
ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(ObjectSizeEstimator objectSizeEstimator, Timer timer, long writeLimit, long readLimit) -
ChannelTrafficShapingHandler
public ChannelTrafficShapingHandler(ObjectSizeEstimator objectSizeEstimator, Timer timer, long checkInterval) -
ChannelTrafficShapingHandler
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Method Details
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submitWrite
void submitWrite(ChannelHandlerContext ctx, MessageEvent evt, long size, long delay, long now) throws Exception - Specified by:
submitWrite
in classAbstractTrafficShapingHandler
- Throws:
Exception
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sendAllValid
- Throws:
Exception
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queueSize
public long queueSize()- Returns:
- current size in bytes of the write buffer.
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channelClosed
Description copied from class:SimpleChannelHandler
Invoked when aChannel
was closed and all its related resources were released.- Overrides:
channelClosed
in classSimpleChannelHandler
- Throws:
Exception
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channelConnected
Description copied from class:SimpleChannelHandler
Invoked when aChannel
is open, bound to a local address, and connected to a remote address.- Overrides:
channelConnected
in classAbstractTrafficShapingHandler
- Throws:
Exception
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releaseExternalResources
public void releaseExternalResources()Description copied from interface:ExternalResourceReleasable
Releases the external resources that this object depends on. You should not call this method if the external resources (e.g. thread pool) are in use by other objects.- Specified by:
releaseExternalResources
in interfaceExternalResourceReleasable
- Overrides:
releaseExternalResources
in classAbstractTrafficShapingHandler
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