drcl.inet.core.queue
Class SRED

java.lang.Object
  |
  +--drcl.DrclObj
        |
        +--drcl.comp.queue.QLogic
              |
              +--drcl.inet.core.queue.SRED

All Implemented Interfaces:

java.lang.Cloneable, ObjectDuplicable, PktClassifier, java.io.Serializable

public class SRED

extends QLogic

implements PktClassifier

The Stabalized Random Early Detection queue logic. The codes are ported from Parks'(parks@ee.eng.ohio-state.edu) ns-2 codes, which were based on T.J. Ott, T.V. Lakshman, L.H. Wong, "SRED: Stabilized RED", IEEE INFOCOM, 1999.

Version:

2.0 03/27/2001, revised and ported to QLogic by Hung-ying Tyan.

Author:

Rong Zheng (zhengr@ee.eng.ohio-state.edu)

See Also:

Serialized Form

Field Summary

protected boolean

mark The mark flag, true for marking CE bit instead of early dropping.

Fields inherited from class drcl.comp.queue.QLogic

capacity, DEFAULT_ADVICE, EVENT_QSIZE, host, qlen, qsize, qSizePort

Constructor Summary

SRED()

SRED(Component host_)

SRED(Component host_, java.lang.String qpid_)

Method Summary

java.lang.String	adviceOn(java.lang.Object obj_, int psize_) Advices the host component for deciding whether or not to drop the (arriving) object.
int	classify(Packet pkt_) Returns the class the packet belongs to.
void	duplicate(java.lang.Object source_) Duplicates the content of the source object to this object.
PktClassifier	getClassifier()
double	getReplaceProb() Returns the replacement probability.
long	getSeed()
double	getSREDMaxProb() Returns the maximum dropping probability.
java.lang.String	info(java.lang.String prefix_) Prints the content (states) of this queue management instance.
boolean	isMarkEnabled()
void	reset() Resets this object to the initial state.
void	setClassifier(PktClassifier c_)
void	setMarkEnabled(boolean enabled_) If enabled, SRED marks the congestion bit of, instead of advising to drop, packets.
void	setRandomNumberGenerator(RandomNumberGenerator ug_)
void	setRandomNumberGenerator(RandomNumberGenerator ug_, long seed_)
void	setReplaceProb(double p) Sets the replacement probability.
void	setSeed(long seed_)
void	setSREDMaxProb(double p) Sets the maximum dropping probability.
void	setSREDParam(double replacep_, double maxp_)

Methods inherited from class drcl.comp.queue.QLogic

dequeueHandler, dropHandler, enqueueHandler, getCapacity, getCurrentQLength, getCurrentQSize, getHost, info, isEmpty, isFull, set, setCapacity, setHost, setQSizePort

Methods inherited from class drcl.DrclObj

clone, toString

Methods inherited from class java.lang.Object

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

Field Detail

mark

protected boolean mark

The mark flag, true for marking CE bit instead of early dropping.

Constructor Detail

SRED

public SRED()

SRED

public SRED(Component host_)

SRED

public SRED(Component host_,
            java.lang.String qpid_)

Method Detail

duplicate

public void duplicate(java.lang.Object source_)

Description copied from class: QLogic

Duplicates the content of the source object to this object. If the host component is already set, this method also creates the queue size change event port of the same ID as that in source_. Subclasses must call super.duplicate() when overriding this method.

Overrides:

duplicate in class QLogic

reset

public void reset()

Description copied from class: QLogic

Resets this object to the initial state. Subclasses must call super.reset() when overriding this method.

Overrides:

reset in class QLogic

info

public java.lang.String info(java.lang.String prefix_)

Description copied from class: QLogic

Prints the content (states) of this queue management instance.

Overrides:

info in class QLogic

Following copied from class: drcl.comp.queue.QLogic

Parameters:

prefix_ - prefix of each line in the printout.

adviceOn

public java.lang.String adviceOn(java.lang.Object obj_,
                                 int psize_)

Description copied from class: QLogic

Advices the host component for deciding whether or not to drop the (arriving) object.

Overrides:

adviceOn in class QLogic

Following copied from class: drcl.comp.queue.QLogic

Returns:

the advice; null if advicing not to drop the object.

classify

public int classify(Packet pkt_)

Description copied from interface: PktClassifier

Returns the class the packet belongs to.

Specified by:

classify in interface PktClassifier

setClassifier

public void setClassifier(PktClassifier c_)

getClassifier

public PktClassifier getClassifier()

setReplaceProb

public void setReplaceProb(double p)

Sets the replacement probability.

getReplaceProb

public double getReplaceProb()

Returns the replacement probability.

setSREDMaxProb

public void setSREDMaxProb(double p)

Sets the maximum dropping probability.

getSREDMaxProb

public double getSREDMaxProb()

Returns the maximum dropping probability.

setSREDParam

public void setSREDParam(double replacep_,
                         double maxp_)

setMarkEnabled

public void setMarkEnabled(boolean enabled_)

If enabled, SRED marks the congestion bit of, instead of advising to drop, packets.

isMarkEnabled

public boolean isMarkEnabled()

setSeed

public void setSeed(long seed_)

getSeed

public long getSeed()

setRandomNumberGenerator

public void setRandomNumberGenerator(RandomNumberGenerator ug_)

setRandomNumberGenerator

public void setRandomNumberGenerator(RandomNumberGenerator ug_,
                                     long seed_)