io.netty.handler.traffic

Class AbstractTrafficShapingHandler

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.channel.ChannelDuplexHandler

io.netty.handler.traffic.AbstractTrafficShapingHandler

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler, ChannelOutboundHandler

Direct Known Subclasses:

ChannelTrafficShapingHandler, GlobalChannelTrafficShapingHandler, GlobalTrafficShapingHandler

public abstract class AbstractTrafficShapingHandler
extends ChannelDuplexHandler

AbstractTrafficShapingHandler allows to limit the global bandwidth (see GlobalTrafficShapingHandler) or per session bandwidth (see ChannelTrafficShapingHandler), as traffic shaping. It allows you to implement an almost real time monitoring of the bandwidth using the monitors from TrafficCounter that will call back every checkInterval the method doAccounting of this handler.

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.

Nested Class Summary

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field and Description
protected long	checkInterval Delay between two performance snapshots
static long	DEFAULT_CHECK_INTERVAL Default delay between two checks: 1s
static long	DEFAULT_MAX_TIME Default max delay in case of traffic shaping (during which no communication will occur).
protected long	maxTime Max delay in wait
protected TrafficCounter	trafficCounter Traffic Counter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractTrafficShapingHandler() Constructor using NO LIMIT, default Check Interval value of 1000L ms and default max time as delay allowed value of 15000L ms.
protected	AbstractTrafficShapingHandler(long checkInterval) Constructor using NO LIMIT and default max time as delay allowed value of 15000L ms.
protected	AbstractTrafficShapingHandler(long writeLimit, long readLimit) Constructor using default Check Interval value of 1000L ms and default max time as delay allowed value of 15000L ms.
protected	AbstractTrafficShapingHandler(long writeLimit, long readLimit, long checkInterval) Constructor using default max time as delay allowed value of 15000L ms.
protected	AbstractTrafficShapingHandler(long writeLimit, long readLimit, long checkInterval, long maxTime)

Method Summary

Modifier and Type	Method and Description
protected long	calculateSize(Object msg) Calculate the size of the given Object.
void	channelRead(ChannelHandlerContext ctx, Object msg) Calls ChannelHandlerContext.fireChannelRead(Object) to forward to the next ChannelInboundHandler in the ChannelPipeline.
void	channelRegistered(ChannelHandlerContext ctx) Calls ChannelHandlerContext.fireChannelRegistered() to forward to the next ChannelInboundHandler in the ChannelPipeline.
void	configure(long newCheckInterval) Change the check interval.
void	configure(long newWriteLimit, long newReadLimit) Change the underlying limitations.
void	configure(long newWriteLimit, long newReadLimit, long newCheckInterval) Change the underlying limitations and check interval.
protected void	doAccounting(TrafficCounter counter) Called each time the accounting is computed from the TrafficCounters.
long	getCheckInterval()
long	getMaxTimeWait()
long	getMaxWriteDelay()
long	getMaxWriteSize()
long	getReadLimit()
long	getWriteLimit()
protected static boolean	isHandlerActive(ChannelHandlerContext ctx)
void	read(ChannelHandlerContext ctx) Calls ChannelHandlerContext.read() to forward to the next ChannelOutboundHandler in the ChannelPipeline.
void	setCheckInterval(long checkInterval)
void	setMaxTimeWait(long 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.
void	setMaxWriteDelay(long 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.
void	setMaxWriteSize(long maxWriteSize) Note that this limit is a best effort on memory limitation to prevent Out Of Memory Exception.
void	setReadLimit(long 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.
void	setWriteLimit(long 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.
protected void	submitWrite(ChannelHandlerContext ctx, Object msg, long delay, ChannelPromise promise) Deprecated.
String	toString()
TrafficCounter	trafficCounter()
protected int	userDefinedWritabilityIndex()
void	write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) Calls ChannelOutboundInvoker.write(Object, ChannelPromise) to forward to the next ChannelOutboundHandler in the ChannelPipeline.

Methods inherited from class io.netty.channel.ChannelDuplexHandler

bind, close, connect, deregister, disconnect, flush

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelReadComplete, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Field Detail

DEFAULT_CHECK_INTERVAL

public static final long DEFAULT_CHECK_INTERVAL

Default delay between two checks: 1s

See Also:

Constant Field Values

DEFAULT_MAX_TIME

public static final long DEFAULT_MAX_TIME

Default max delay in case of traffic shaping (during which no communication will occur). Shall be less than TIMEOUT. Here half of "standard" 30s

See Also:

Constant Field Values

trafficCounter

protected TrafficCounter trafficCounter

Traffic Counter

maxTime

protected volatile long maxTime

Max delay in wait

checkInterval

protected volatile long checkInterval

Delay between two performance snapshots

Constructor Detail

AbstractTrafficShapingHandler

protected AbstractTrafficShapingHandler(long writeLimit,
                                        long readLimit,
                                        long checkInterval,
                                        long maxTime)

Parameters:

writeLimit - 0 or a limit in bytes/s

readLimit - 0 or a limit in bytes/s

checkInterval - The delay between two computations of performances for channels or 0 if no stats are to be computed.

maxTime - The maximum delay to wait in case of traffic excess. Must be positive.

AbstractTrafficShapingHandler

protected AbstractTrafficShapingHandler(long writeLimit,
                                        long readLimit,
                                        long checkInterval)

Constructor using default max time as delay allowed value of 15000L ms.

Parameters:

writeLimit - 0 or a limit in bytes/s

readLimit - 0 or a limit in bytes/s

checkInterval - The delay between two computations of performances for channels or 0 if no stats are to be computed.

AbstractTrafficShapingHandler

protected AbstractTrafficShapingHandler(long writeLimit,
                                        long readLimit)

Constructor using default Check Interval value of 1000L ms and default max time as delay allowed value of 15000L ms.

Parameters:

writeLimit - 0 or a limit in bytes/s

readLimit - 0 or a limit in bytes/s

AbstractTrafficShapingHandler

protected AbstractTrafficShapingHandler()

Constructor using NO LIMIT, default Check Interval value of 1000L ms and default max time as delay allowed value of 15000L ms.

AbstractTrafficShapingHandler

protected AbstractTrafficShapingHandler(long checkInterval)

Constructor using NO LIMIT and default max time as delay allowed value of 15000L ms.

Parameters:

checkInterval - The delay between two computations of performances for channels or 0 if no stats are to be computed.

Method Detail

userDefinedWritabilityIndex

protected int userDefinedWritabilityIndex()

Returns:

the index to be used by the TrafficShapingHandler to manage the user defined writability. For Channel TSH it is defined as , for Global TSH it is defined as , for GlobalChannel TSH it is defined as .

configure

public void configure(long newWriteLimit,
                      long newReadLimit,
                      long newCheckInterval)

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.

Parameters:

newWriteLimit - The new write limit (in bytes)

newReadLimit - The new read limit (in bytes)

newCheckInterval - The new check interval (in milliseconds)

configure

public void configure(long newWriteLimit,
                      long newReadLimit)

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.

Parameters:

newWriteLimit - The new write limit (in bytes)

newReadLimit - The new read limit (in bytes)

configure

public void configure(long newCheckInterval)

Change the check interval.

Parameters:

newCheckInterval - The new check interval (in milliseconds)

getWriteLimit

public long getWriteLimit()

Returns:

the writeLimit

setWriteLimit

public void setWriteLimit(long 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.

Parameters:

writeLimit - the writeLimit to set

getReadLimit

public long getReadLimit()

Returns:

the readLimit

setReadLimit

public void setReadLimit(long 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.

Parameters:

readLimit - the readLimit to set

getCheckInterval

public long getCheckInterval()

Returns:

the checkInterval

setCheckInterval

public void setCheckInterval(long checkInterval)

Parameters:

checkInterval - the interval in ms between each step check to set, default value being 1000 ms.

setMaxTimeWait

public void setMaxTimeWait(long 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.

Parameters:

maxTime - Max delay in wait, shall be less than TIME OUT in related protocol. Must be positive.

getMaxTimeWait

public long getMaxTimeWait()

Returns:

the max delay in wait to prevent TIME OUT

getMaxWriteDelay

public long getMaxWriteDelay()

Returns:

the maxWriteDelay

setMaxWriteDelay

public void setMaxWriteDelay(long 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.

Parameters:

maxWriteDelay - the maximum Write Delay in ms in the buffer allowed before write suspension is set. Must be positive.

getMaxWriteSize

public long getMaxWriteSize()

Returns:

the maxWriteSize default being bytes.

setMaxWriteSize

public void setMaxWriteSize(long maxWriteSize)

Note that this limit is a best effort on memory limitation to prevent Out Of Memory Exception. To ensure it works, the handler generating the write should use one of the way provided by Netty to handle the capacity:

- the Channel.isWritable() property and the corresponding channelWritabilityChanged()

- the ChannelFuture.addListener(new GenericFutureListener())

Parameters:

maxWriteSize - the maximum Write Size allowed in the buffer per channel before write suspended is set, default being bytes.

doAccounting

protected void doAccounting(TrafficCounter counter)

Called each time the accounting is computed from the TrafficCounters. This method could be used for instance to implement almost real time accounting.

Parameters:

counter - the TrafficCounter that computes its performance

channelRead

public void channelRead(ChannelHandlerContext ctx,
                        Object msg)
                 throws Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelRead(Object) to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelRead in interface ChannelInboundHandler

Overrides:

channelRead in class ChannelInboundHandlerAdapter

Throws:

Exception

isHandlerActive

protected static boolean isHandlerActive(ChannelHandlerContext ctx)

read

public void read(ChannelHandlerContext ctx)

Description copied from class: ChannelDuplexHandler

Calls ChannelHandlerContext.read() to forward to the next ChannelOutboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

read in interface ChannelOutboundHandler

Overrides:

read in class ChannelDuplexHandler

write

public void write(ChannelHandlerContext ctx,
                  Object msg,
                  ChannelPromise promise)
           throws Exception

Description copied from class: ChannelDuplexHandler

Calls ChannelOutboundInvoker.write(Object, ChannelPromise) to forward to the next ChannelOutboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

write in interface ChannelOutboundHandler

Overrides:

write in class ChannelDuplexHandler

Parameters:

ctx - the ChannelHandlerContext for which the write operation is made

msg - the message to write

promise - the ChannelPromise to notify once the operation completes

Throws:

Exception - thrown if an error occurs

submitWrite

@Deprecated
protected void submitWrite(ChannelHandlerContext ctx,
                                       Object msg,
                                       long delay,
                                       ChannelPromise promise)

Deprecated.

channelRegistered

public void channelRegistered(ChannelHandlerContext ctx)
                       throws Exception

Description copied from class: ChannelInboundHandlerAdapter

Calls ChannelHandlerContext.fireChannelRegistered() to forward to the next ChannelInboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

channelRegistered in interface ChannelInboundHandler

Overrides:

channelRegistered in class ChannelInboundHandlerAdapter

Throws:

Exception

trafficCounter

public TrafficCounter trafficCounter()

Returns:

the current TrafficCounter (if channel is still connected)

toString

public String toString()

Overrides:

toString in class Object

calculateSize

protected long calculateSize(Object msg)

Calculate the size of the given Object. This implementation supports ByteBuf and ByteBufHolder. Sub-classes may override this.

Parameters:

msg - the msg for which the size should be calculated.

Returns:

size the size of the msg or -1 if unknown.