parallel.tasks.TaskBase Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jstat Show documentation
Java Library for Statistical Analysis.
The newest version!
package parallel.tasks;

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.Callable;
import java.util.concurrent.CyclicBarrier;

public abstract class TaskBase implements Callable, Runnable{

    /**
     * Constructor
     */
    protected TaskBase(CyclicBarrier barrier){
        this.barrier = barrier;
        this.finished = false;
        this.result = null;
        this.taskId = -1;
    }

    /**
     * Constructor
     */
    protected TaskBase(){
        this.barrier = null;
        this.finished = false;
        this.result = null;
        this.taskId = -1;
    }

    @Override
    public  T call(){

        this.run();
        return this.result;
    }

    public void waitOnBarrier(){

        // now wait until all threads are summed
        try {

            if(this.barrier == null){
                throw new IllegalStateException("Attempt to use a null barrier");
            }
            this.barrier.await();
        }
        catch(InterruptedException e){
            System.out.println("InterruptedException: "+ e.getMessage());
        }
        catch(BrokenBarrierException e){
            System.out.println("BorkenBarrierException: "+ e.getMessage());
        }
    }

    /**
     * Return true if the task is finished
     */
    public boolean isFinished(){
        return this.finished;
    }

    /**
     * Set the finished flag
     */
    public void setFinished(boolean flag){
        this.finished = flag;
    }

    /**
     * Return the result computed by the task
     */
    public T getResult(){
        return result;
    }

    /**
     * Set the result computed by the task
     */
    public void setResult(T result){
        this.result = result;
    }

    /**
     * Returns the task id
     */
    public int getTaskId(){
        return this.taskId;
    }

    /**
     * Set the the task id
     */
    public void setTaskId(int id){
        this.taskId = id;
    }

    protected CyclicBarrier barrier;
    protected boolean finished;
    protected T result;
    protected int taskId;
}