ds.funnel.traffic.component.timedistribution

Class RandomTimeDistribution

java.lang.Object

ds.funnel.traffic.component.timedistribution.RandomTimeDistribution

All Implemented Interfaces:

PacketTimeDistribution

public class RandomTimeDistribution
extends java.lang.Object
implements PacketTimeDistribution

RandomTimeDistribution defines a packet distribution pattern in which packets are sent at random intervals with a uniform distribution. A RandomTimeDistribution has a minimum packet transmission interval and a maximum packet transmission interval, in milliseconds. All intervals returned by the nextInterval() method of this distribution will be between these two values. The default minimum interval is 10 ms, and the default maximum interval is 100 ms.

Author:

Kira Lindburg

Constructor Summary

Constructors

Constructor and Description
RandomTimeDistribution() Constructs a new RandomTimeDistribution with default minimum and maximum packet transmission rates.
RandomTimeDistribution(int upperOrLowerBound) Constructs a RandomTimeDistribution with one default parameter, and a specified minimum or maximum, depending upon the exact value specified.
RandomTimeDistribution(int bound1, int bound2) Constructs a new RandomTimeDistribution with the specified upper and lower bounds on intervals between packet transmissions.

Method Summary

Modifier and Type	Method and Description
int	getMaxInterval()
int	getMinInterval()
int	getType()
int	nextInterval() Calculates the next interval at which a packet should be sent in a random distribution.
int[]	prediction(int size) Generates an array containing predicted packet transmission times, in terms of number of ms from this instant.
void	setIntervalBounds(int bound1, int bound2) Sets the minimum and maximum intervals for packet transmissions to the specified bounds.
void	setMaxInterval(int newMaxInterval)
void	setMinInterval(int newMinInterval)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RandomTimeDistribution

public RandomTimeDistribution()

Constructs a new RandomTimeDistribution with default minimum and maximum packet transmission rates.

RandomTimeDistribution

public RandomTimeDistribution(int upperOrLowerBound)

Constructs a RandomTimeDistribution with one default parameter, and a specified minimum or maximum, depending upon the exact value specified. If the specified bound is greater than the default minimum packet transmission interval, then the minimum packet transmission interval will be the default and the maximum packet transmission interval will be the specified value; else, the maximum packet transmission interval will be the default and the minimum packet transmission interval will be the specified value.

Parameters:

upperOrLowerBound - the wanted minimum (if less than the default minimum) or maximum (if greater than the default minimum) packet transmission interval in ms, for this RandomTimeDistribution

RandomTimeDistribution

public RandomTimeDistribution(int bound1,
                              int bound2)

Constructs a new RandomTimeDistribution with the specified upper and lower bounds on intervals between packet transmissions. The bounds may be specified in either order.

Parameters:

bound1 - the first bound (either min or max) on packet transmission intervals (in ms)

bound2 - the second bound (either min or max) on packet transmission intervals (in ms)

Method Detail

getMinInterval

public int getMinInterval()

setMinInterval

public void setMinInterval(int newMinInterval)

getMaxInterval

public int getMaxInterval()

setMaxInterval

public void setMaxInterval(int newMaxInterval)

setIntervalBounds

public void setIntervalBounds(int bound1,
                              int bound2)

Sets the minimum and maximum intervals for packet transmissions to the specified bounds. The bounds may be given in either order.

Parameters:

bound1 - the first bound (either min or max) on packet transmission intervals

bound2 - the second bound (either min or max) on packet transmission intervals

getType

public int getType()

Specified by:

getType in interface PacketTimeDistribution

Returns:

an integer id number specifying the type of distribution. This should be a unique identifier for the type of time distribution generated by a given PacketTimeDistribution.

nextInterval

public int nextInterval()

Calculates the next interval at which a packet should be sent in a random distribution. The interval will be between this RandomTimeDistribution's minInterval and maxInterval.

Specified by:

nextInterval in interface PacketTimeDistribution

Returns:

the amount of time (in ms) to wait before another packet should be sent

prediction

public int[] prediction(int size)

Description copied from interface: PacketTimeDistribution

Generates an array containing predicted packet transmission times, in terms of number of ms from this instant.

Specified by:

prediction in interface PacketTimeDistribution

Parameters:

size - the number of predictions contained in the returned array

Returns:

an array of the specified size, containing predicted packet transmission times in numbers of ms after this method was called