Class SolverSingleClosedExact

java.lang.Object

solvers.Solver

solvers.singleSolverAlgorithms.SolverSingleClosedExact

Direct Known Subclasses:

SolverSingleClosedExactDyn

public class SolverSingleClosedExact
extends Solver

Solves a single class closed model using the normalisation constant algorithm, one of the exact solution techniques available in JMVA for closed product form queueing networks. A preordering algorithm is applied to obtain a numerically stable network before the solution.

Author:

Federico Granata

Field Summary

Fields

Modifier and Type	Field	Description
protected double[]	auxFun	computes the auxiliary function of the system
protected int	customers	number of customers or jobs in the system
protected double[]	G	normalisation constant

Fields inherited from class Solver

DELAY, HOL, LD, LI, name, PRS, queueLen, residenceTime, servTime, stations, throughput, totRespTime, totThroughput, totUser, type, utilization, visits

Constructor Summary

Constructors

Constructor	Description
SolverSingleClosedExact(int customers, int stations)	Creates a new SolverSingleClosedExact

Method Summary

Modifier and Type	Method	Description
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 such a load.
void	indices()	Calculates the indices of interest for the system. For a description of the algorithm see: S.C.
void	solve()	Solves the system through the normalisation constant algorithm.

Methods inherited from class Solver

getQueueLen, getQueueLen, getResTime, getResTime, getThroughput, getThroughput, getTotResTime, getTotThroughput, getTotUser, getUtilization, getUtilization, input, printIndices, toString

Methods inherited from class Object

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

Field Details

customers

protected int customers

number of customers or jobs in the system

G

protected double[] G

normalisation constant

auxFun

protected double[] auxFun

computes the auxiliary function of the system

Constructor Details

SolverSingleClosedExact

public SolverSingleClosedExact(int customers,
 int stations)

Creates a new SolverSingleClosedExact

Parameters:

customers - number of customers

stations - number of service centers

Method Details

indices

public void indices()

Calculates the indices of interest for the system.
For a description of the algorithm see:
S.C. Bruell, G. Balbo,
"Computational Algorithms for closed Queueing Networks",
1980, Elsevier North Holland

hasSufficientProcessingCapacity

public 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 such a load.
WARNING: This method should be called before solving the system.

Specified by:

hasSufficientProcessingCapacity in class Solver

Returns:

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

solve

public void solve()

Solves the system through the normalisation constant algorithm. For a description of the algorithm see: S.C. Bruell, G. Balbo,
"Computational Algorithms for closed Queueing Networks",
1980, Elsevier North Holland

Specified by:

solve in class Solver