Class AMVA

java.lang.Object

solvers.queueingnet.amva.SolverMulti

solvers.queueingnet.amva.AMVA

Direct Known Subclasses:

AQL, BardSchweitzer, Chow, Linearizer

public abstract class AMVA
extends SolverMulti

This class implements the abstract superclass for approximate MVA algorithms for solving multi-closed models

Author:

Abhimanyu Chugh

Field Summary

Fields

Modifier and Type	Field	Description
protected int[]	clsPopulation
static final double	DEFAULT_TOLERANCE
protected int	iterations
protected int	MAX_ITERATIONS
protected double	tolerance

Fields inherited from class SolverMulti

classes, CLOSED_CLASS, clsNumJobs, clsRespTime, clsThroughput, DELAY, LD, LI, name, OPEN_CLASS, pw, queueLen, residenceTime, scQueueLen, scResidTime, scThroughput, scUtilization, servers, servTime, stations, sysNumJobs, sysResponseTime, sysThroughput, throughput, type, utilization, visits

Constructor Summary

Constructors

Constructor	Description
AMVA(int classes, int stations, int[] classPopulation)

Method Summary

Modifier and Type	Method	Description
int	getIterations()
protected abstract double[][]	getQueueLensWithOneLessCustomer()
double	getTotNumJobs()	Returns the number of jobs in the system
boolean	hasSufficientProcessingCapacity()	A system is said to have sufficient capacity to process a given load lambda if no service center is saturated as a result of the combined loads of all the classes.
protected double	maxDiff(double[][] oldQueueLens, double[][] currentQueueLens)	returns the max difference between the old queue lengths and the current queue lengths of each station and class
protected double	maxDiff(double[] scOldQueueLens, double[] scCurrentQueueLens)	returns the max difference between the old queue lengths and the current queue lengths of each station
void	setMaxIterations(int maxIterations)
void	setTolerance(double tolerance)
void	solve()	Must be implemented to create a multi class model solver.
void	solveLI()
static Double	validateTolerance(String tolerance)	check whether the given tolerance is valid or not

Methods inherited from class SolverMulti

getAggrQueueLen, getAggrQueueLen, getAggrResTime, getAggrResTime, getAggrThroughput, getAggrThroughput, getAggrUtilization, getAggrUtilization, getClsResTime, getClsResTime, getClsThroughput, getClsThroughput, getQueueLen, getQueueLen, getResTime, getResTime, getThroughput, getThroughput, getTotResTime, getTotThroughput, getUtilization, getUtilization, input, printIndices

Methods inherited from class Object

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

Field Details

DEFAULT_TOLERANCE

public static final double DEFAULT_TOLERANCE

tolerance

protected double tolerance

MAX_ITERATIONS

protected int MAX_ITERATIONS

clsPopulation

protected int[] clsPopulation

iterations

protected int iterations

Constructor Details

AMVA

public AMVA(int classes,
 int stations,
 int[] classPopulation)

Method Details

validateTolerance

public static Double validateTolerance(String tolerance)

check whether the given tolerance is valid or not

Parameters:

tolerance -

Returns:

a Double if valid, otherwise null

setTolerance

public void setTolerance(double tolerance)

setMaxIterations

public void setMaxIterations(int maxIterations)

getIterations

public int getIterations()

getTotNumJobs

public double getTotNumJobs()

Returns the number of jobs in the system

Returns:

the total number of jobs

solve

public void solve()

Description copied from class: SolverMulti

Must be implemented to create a multi class model solver.

Specified by:

solve in class SolverMulti

solveLI

public void solveLI()

getQueueLensWithOneLessCustomer

protected abstract double[][] getQueueLensWithOneLessCustomer()

maxDiff

protected double maxDiff(double[] scOldQueueLens,
 double[] scCurrentQueueLens)

returns the max difference between the old queue lengths and the current queue lengths of each station

Parameters:

scOldQueueLens - the old queue lengths to compare with current queue lengths (scCurrentQueueLens)

scCurrentQueueLens - the current queue lengths used for comparison

Returns:

the max difference

maxDiff

protected double maxDiff(double[][] oldQueueLens,
 double[][] currentQueueLens)

returns the max difference between the old queue lengths and the current queue lengths of each station and class

Parameters:

oldQueueLens - the old queue lengths to compare with current queue lengths (scCurrentQueueLens)

currentQueueLens - the current queue lengths used for comparison

Returns:

the max difference

hasSufficientProcessingCapacity

public boolean hasSufficientProcessingCapacity()

Description copied from class: SolverMulti

A system is said to have sufficient capacity to process a given load lambda if no service center is saturated as a result of the combined loads of all the classes.
Must be implemented to create a multi class model solver.
WARNING: This method should be called before solving the system.

Specified by:

hasSufficientProcessingCapacity in class SolverMulti

Returns:

true if sufficient capacity exists for the given workload, false otherwise