net.tomp2p.utils

Class AbstractTrafficShapingHandler

java.lang.Object

org.jboss.netty.channel.SimpleChannelHandler

net.tomp2p.utils.AbstractTrafficShapingHandler

All Implemented Interfaces:

org.jboss.netty.channel.ChannelDownstreamHandler, org.jboss.netty.channel.ChannelHandler, org.jboss.netty.channel.ChannelUpstreamHandler, org.jboss.netty.util.ExternalResourceReleasable

public abstract class AbstractTrafficShapingHandler
extends org.jboss.netty.channel.SimpleChannelHandler
implements org.jboss.netty.util.ExternalResourceReleasable

AbstractTrafficShapingHandler allows to limit the global bandwidth (see GlobalTrafficShapingHandler) or per session bandwidth (see ChannelTrafficShapingHandler), as traffic shaping. It allows too 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.

An 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 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.

Version:

$Rev$, $Date$

Author:

The Netty Project (netty-dev@lists.jboss.org), Frederic Bregier

Nested Class Summary

Nested classes/interfaces inherited from interface org.jboss.netty.channel.ChannelHandler

org.jboss.netty.channel.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
protected Executor	executor Executor to associated to any TrafficCounter
protected TrafficCounter	trafficCounter Traffic Counter

Constructor Summary

Constructors

Constructor and Description
AbstractTrafficShapingHandler(Executor executor) Constructor using default ObjectSizeEstimator and using NO LIMIT and default Check Interval
AbstractTrafficShapingHandler(Executor executor, long checkInterval) Constructor using default ObjectSizeEstimator and using NO LIMIT
AbstractTrafficShapingHandler(Executor executor, long writeLimit, long readLimit) Constructor using default ObjectSizeEstimator and using default Check Interval
AbstractTrafficShapingHandler(Executor executor, long writeLimit, long readLimit, long checkInterval) Constructor using default ObjectSizeEstimator
AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator, Executor executor) Constructor using the specified ObjectSizeEstimator and using NO LIMIT and default Check Interval
AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator, Executor executor, long checkInterval) Constructor using the specified ObjectSizeEstimator and using NO LIMIT
AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator, Executor executor, long writeLimit, long readLimit) Constructor using the specified ObjectSizeEstimator and using default Check Interval
AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator, Executor executor, long writeLimit, long readLimit, long checkInterval) Constructor using the specified ObjectSizeEstimator

Method Summary

Methods

Modifier and Type	Method and Description
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.
TrafficCounter	getTrafficCounter()
void	handleDownstream(org.jboss.netty.channel.ChannelHandlerContext ctx, org.jboss.netty.channel.ChannelEvent e)
boolean	hasLimit()
void	messageReceived(org.jboss.netty.channel.ChannelHandlerContext arg0, org.jboss.netty.channel.MessageEvent arg1)
void	releaseExternalResources()
String	toString()
void	writeRequested(org.jboss.netty.channel.ChannelHandlerContext arg0, org.jboss.netty.channel.MessageEvent arg1)

Methods inherited from class org.jboss.netty.channel.SimpleChannelHandler

bindRequested, channelBound, channelClosed, channelConnected, channelDisconnected, channelInterestChanged, channelOpen, channelUnbound, childChannelClosed, childChannelOpen, closeRequested, connectRequested, disconnectRequested, exceptionCaught, handleUpstream, setInterestOpsRequested, unbindRequested, writeComplete

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CHECK_INTERVAL

public static final long DEFAULT_CHECK_INTERVAL

Default delay between two checks: 1s

See Also:

Constant Field Values

trafficCounter

protected TrafficCounter trafficCounter

Traffic Counter

executor

protected Executor executor

Executor to associated to any TrafficCounter

checkInterval

protected long checkInterval

Delay between two performance snapshots

Constructor Detail

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(Executor executor,
                             long writeLimit,
                             long readLimit,
                             long checkInterval)

Constructor using default ObjectSizeEstimator

Parameters:

executor - created for instance like Executors.newCachedThreadPool

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

public AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator,
                             Executor executor,
                             long writeLimit,
                             long readLimit,
                             long checkInterval)

Constructor using the specified ObjectSizeEstimator

Parameters:

objectSizeEstimator - the ObjectSizeEstimator that will be used to compute the size of the message

executor - created for instance like Executors.newCachedThreadPool

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

public AbstractTrafficShapingHandler(Executor executor,
                             long writeLimit,
                             long readLimit)

Constructor using default ObjectSizeEstimator and using default Check Interval

Parameters:

executor - created for instance like Executors.newCachedThreadPool

writeLimit - 0 or a limit in bytes/s

readLimit - 0 or a limit in bytes/s

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator,
                             Executor executor,
                             long writeLimit,
                             long readLimit)

Constructor using the specified ObjectSizeEstimator and using default Check Interval

Parameters:

objectSizeEstimator - the ObjectSizeEstimator that will be used to compute the size of the message

executor - created for instance like Executors.newCachedThreadPool

writeLimit - 0 or a limit in bytes/s

readLimit - 0 or a limit in bytes/s

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(Executor executor)

Constructor using default ObjectSizeEstimator and using NO LIMIT and default Check Interval

Parameters:

executor - created for instance like Executors.newCachedThreadPool

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator,
                             Executor executor)

Constructor using the specified ObjectSizeEstimator and using NO LIMIT and default Check Interval

Parameters:

objectSizeEstimator - the ObjectSizeEstimator that will be used to compute the size of the message

executor - created for instance like Executors.newCachedThreadPool

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(Executor executor,
                             long checkInterval)

Constructor using default ObjectSizeEstimator and using NO LIMIT

Parameters:

executor - created for instance like Executors.newCachedThreadPool

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

AbstractTrafficShapingHandler

public AbstractTrafficShapingHandler(org.jboss.netty.util.ObjectSizeEstimator objectSizeEstimator,
                             Executor executor,
                             long checkInterval)

Constructor using the specified ObjectSizeEstimator and using NO LIMIT

Parameters:

objectSizeEstimator - the ObjectSizeEstimator that will be used to compute the size of the message

executor - created for instance like Executors.newCachedThreadPool

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

Method Detail

configure

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

Change the underlying limitations and check interval.

Parameters:

newWriteLimit -

newReadLimit -

newCheckInterval -

configure

public void configure(long newWriteLimit,
             long newReadLimit)

Change the underlying limitations.

Parameters:

newWriteLimit -

newReadLimit -

configure

public void configure(long newCheckInterval)

Change the check interval.

Parameters:

newCheckInterval -

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

messageReceived

public void messageReceived(org.jboss.netty.channel.ChannelHandlerContext arg0,
                   org.jboss.netty.channel.MessageEvent arg1)
                     throws Exception

Overrides:

messageReceived in class org.jboss.netty.channel.SimpleChannelHandler

Throws:

Exception

writeRequested

public void writeRequested(org.jboss.netty.channel.ChannelHandlerContext arg0,
                  org.jboss.netty.channel.MessageEvent arg1)
                    throws Exception

Overrides:

writeRequested in class org.jboss.netty.channel.SimpleChannelHandler

Throws:

Exception

handleDownstream

public void handleDownstream(org.jboss.netty.channel.ChannelHandlerContext ctx,
                    org.jboss.netty.channel.ChannelEvent e)
                      throws Exception

Specified by:

handleDownstream in interface org.jboss.netty.channel.ChannelDownstreamHandler

Overrides:

handleDownstream in class org.jboss.netty.channel.SimpleChannelHandler

Throws:

Exception

getTrafficCounter

public TrafficCounter getTrafficCounter()

Returns:

the current TrafficCounter (if channel is still connected)

releaseExternalResources

public void releaseExternalResources()

Specified by:

releaseExternalResources in interface org.jboss.netty.util.ExternalResourceReleasable

toString

public String toString()

Overrides:

toString in class Object

hasLimit

public boolean hasLimit()