Class CoMoMBasis

java.lang.Object

solvers.basis.Basis

solvers.basis.CoMoMBasis

Direct Known Subclasses:

BTFCoMoMBasis

public class CoMoMBasis
extends Basis

A class to encapsulate the Basis of CoMoM The basis is intialised according to the initial conditions of CoMoM. An ordered list of PopulationChangeVectors is generated to provide the indexOf() functionality i.e. to return the index of a normalising constant in the basis. Subclasses can specify a Comparator to sort this list as they choose. Subclasses can specify a Comparator to sort this list as they choose.

Author:

Jack Bradshaw

Field Summary

Fields inherited from class Basis

basis, current_class, current_class_population, M, order, previous_basis, qnm, R, size, uncomputables

Constructor Summary

Constructors

Constructor	Description
CoMoMBasis(QNModel m)	Constructor

Method Summary

Modifier and Type	Method	Description
void	computePerformanceMeasures()	Computes Mean Throughput and Mean Queue Length performance indices and stores them in the queueing network model object, qnm
BigRational	getNormalisingConstant()	Returns the Normalising Constant for the current computed population
ArrayList<PopulationChangeVector>	getOrder()
PopulationChangeVector	getPopulationChangeVector(int index)	Returns the population change vector.
int	indexOf(PopulationChangeVector n, int m)	Finds the index of Normalising Constant G(N-n, m) as determined by n and m
int	indexOf(PopulationChangeVector n, MultiplicitiesVector m)	Finds the index of Normalising Constant G(N-n, m) as determined by n and m
void	initialiseBasis()	Initialises the basis for population (0,...0)
void	print()	Prints the vectors in the 'order' vector
void	print_values()
void	setSize()	Calculates the size of the basis to be store in variable size

Methods inherited from class Basis

computatble, getCurrentClass, getCurrentClassPopulation, getNewValue, getOldValue, getSize, getUncomputables, initialiseForClass, reset_uncomputables, setComparator, setCurrentClassPopulation, setValue, sort, startBasisComputation

Methods inherited from class Object

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

Constructor Details

CoMoMBasis

public CoMoMBasis(QNModel m)

Constructor

Parameters:

m - The Queueing Network Model under study

Method Details

indexOf

public int indexOf(PopulationChangeVector n,
 MultiplicitiesVector m)
            throws InternalErrorException

Finds the index of Normalising Constant G(N-n, m) as determined by n and m

Parameters:

n - Change in population vector

m - Multiplicity vector

Returns:

Index of G(N-n, m) in basis

Throws:

InternalErrorException

indexOf

public int indexOf(PopulationChangeVector n,
 int m)
            throws InternalErrorException

Finds the index of Normalising Constant G(N-n, m) as determined by n and m

Parameters:

n - Change in population vector

m - index of queue added (0 for no queue added)

Returns:

Index of G(N-n, m) in basis

Throws:

InternalErrorException

getPopulationChangeVector

public PopulationChangeVector getPopulationChangeVector(int index)

Returns the population change vector.

Parameters:

index - index in order

Returns:

Vector store in 'order' at 'index'

print

public void print()

Prints the vectors in the 'order' vector

initialiseBasis

public void initialiseBasis()
                     throws InternalErrorException

Initialises the basis for population (0,...0)

Specified by:

initialiseBasis in class Basis

Throws:

InternalErrorException

setSize

public void setSize()

Calculates the size of the basis to be store in variable size

Specified by:

setSize in class Basis

computePerformanceMeasures

public void computePerformanceMeasures()
                                throws InternalErrorException

Computes Mean Throughput and Mean Queue Length performance indices and stores them in the queueing network model object, qnm

Specified by:

computePerformanceMeasures in class Basis

Throws:

InternalErrorException

getNormalisingConstant

public BigRational getNormalisingConstant()
                                   throws InternalErrorException

Returns the Normalising Constant for the current computed population

Specified by:

getNormalisingConstant in class Basis

Returns:

the resulting big rational

Throws:

InternalErrorException

print_values

public void print_values()

getOrder

public ArrayList<PopulationChangeVector> getOrder()