martin.common.compthreads
Class ArrayBasedMaster<E>

java.lang.Object
  martin.common.compthreads.Master<E>
      martin.common.compthreads.ArrayBasedMaster<E>

All Implemented Interfaces:

java.lang.Runnable

public class ArrayBasedMaster<E>
extends Master<E>
implements java.lang.Runnable

Class for facilitating parallelized computations. This class provides functionality when the "problem" instances are stored in an array, while the IteratorBasedMaster class is better suited when the problems are given by an iterator. Usage example: new Thread(new ArrayBasedMaster(problems, 4)).start(); Object[] solutions = master.getSolutions();

Author:

Martin

Field Summary

private Problem<E>[]	problems
private java.lang.Object[]	solutions
private java.util.concurrent.Semaphore	solutionsem
private java.util.concurrent.Semaphore	threadsem

Constructor Summary

ArrayBasedMaster(Problem<E>[] problems, int numThreads)

Method Summary

java.util.ArrayList<E>	getArrayListSolutions()
java.lang.Object[]	getSolutions() This method will block until all problems have been processed and computed.
(package private) void	report(E solution, int id) Called by the worker threads as they complete.
void	run() The method which is run as the master thread starts.

Methods inherited from class martin.common.compthreads.Master

getReportProgress, setReportProgress, startThread

Methods inherited from class java.lang.Object

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

Field Detail

problems

private Problem<E>[] problems

solutions

private java.lang.Object[] solutions

threadsem

private java.util.concurrent.Semaphore threadsem

solutionsem

private java.util.concurrent.Semaphore solutionsem

Constructor Detail

ArrayBasedMaster

public ArrayBasedMaster(Problem<E>[] problems,
                        int numThreads)

Method Detail

run

public void run()

The method which is run as the master thread starts. Should not be run directly by the user.

Specified by:

run in interface java.lang.Runnable

Specified by:

run in class Master<E>

getSolutions

public java.lang.Object[] getSolutions()

This method will block until all problems have been processed and computed. Returned solutions will be in the same order as the order of the problems given to the constructor.

Returns:

the solutions to the problems specified (i.e. an array with the objects that are returned from the problem compute() methods).

getArrayListSolutions

public java.util.ArrayList<E> getArrayListSolutions()

report

void report(E solution,
            int id)

Called by the worker threads as they complete.

Specified by:

report in class Master<E>