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/*
* Created on Tuesday, May 03 2011
*/
package com.jogamp.opencl.util.concurrent;
import com.jogamp.opencl.CLCommandQueue;
import com.jogamp.opencl.CLDevice;
import com.jogamp.opencl.CLResource;
import com.jogamp.opencl.util.CLMultiContext;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
/**
* A multithreaded pool of OpenCL command queues.
* It serves as a multiplexer distributing tasks over N queues.
* The usage of this pool is similar to {@link ExecutorService} but it uses {@link CLTask}s
* instead of {@link Callable}s.
* @author Michael Bien
*/
public class CLCommandQueuePool implements CLResource {
private final List<CLCommandQueue> queues;
private final ExecutorService excecutor;
private FinishAction finishAction = FinishAction.DO_NOTHING;
private CLCommandQueuePool(Collection<CLCommandQueue> queues) {
this.queues = Collections.unmodifiableList(new ArrayList<CLCommandQueue>(queues));
this.excecutor = Executors.newFixedThreadPool(queues.size(), new QueueThreadFactory(this.queues));
}
public static CLCommandQueuePool create(CLMultiContext mc, CLCommandQueue.Mode... modes) {
return create(mc.getDevices(), modes);
}
public static CLCommandQueuePool create(Collection<CLDevice> devices, CLCommandQueue.Mode... modes) {
List<CLCommandQueue> queues = new ArrayList<CLCommandQueue>(devices.size());
for (CLDevice device : devices) {
queues.add(device.createCommandQueue(modes));
}
return create(queues);
}
public static CLCommandQueuePool create(Collection<CLCommandQueue> queues) {
return new CLCommandQueuePool(queues);
}
public <R> Future<R> submit(CLTask<R> task) {
return excecutor.submit(new TaskWrapper(task, finishAction));
}
public <R> List<Future<R>> invokeAll(Collection<CLTask<R>> tasks) throws InterruptedException {
List<TaskWrapper<R>> wrapper = new ArrayList<TaskWrapper<R>>(tasks.size());
for (CLTask<R> task : tasks) {
wrapper.add(new TaskWrapper<R>(task, finishAction));
}
return excecutor.invokeAll(wrapper);
}
/**
* Calls {@link CLCommandQueue#flush()} on all queues.
*/
public void flush() {
for (CLCommandQueue queue : queues) {
queue.flush();
}
}
/**
* Calls {@link CLCommandQueue#finish()} on all queues.
*/
public void finish() {
for (CLCommandQueue queue : queues) {
queue.finish();
}
}
/**
* Releases all queues.
*/
public void release() {
for (CLCommandQueue queue : queues) {
queue.finish().release();
}
excecutor.shutdown();
}
/**
* Returns the command queues used in this pool.
*/
public List<CLCommandQueue> getQueues() {
return queues;
}
/**
* Returns the size of this pool (number of command queues).
*/
public int getSize() {
return queues.size();
}
public FinishAction getFinishAction() {
return finishAction;
}
public void setFinishAction(FinishAction action) {
this.finishAction = action;
}
@Override
public String toString() {
return getClass().getSimpleName()+" [queues: "+queues.size()+" on finish: "+finishAction+"]";
}
private static class QueueThreadFactory implements ThreadFactory {
private final List<CLCommandQueue> queues;
private int index;
private QueueThreadFactory(List<CLCommandQueue> queues) {
this.queues = queues;
this.index = 0;
}
public synchronized Thread newThread(Runnable r) {
CLCommandQueue queue = queues.get(index++);
return new QueueThread(queue);
}
}
private static class QueueThread extends Thread {
private final CLCommandQueue queue;
public QueueThread(CLCommandQueue queue) {
this.queue = queue;
}
}
private static class TaskWrapper<T> implements Callable<T> {
private final CLTask<T> task;
private final FinishAction mode;
public TaskWrapper(CLTask<T> task, FinishAction mode) {
this.task = task;
this.mode = mode;
}
public T call() throws Exception {
CLCommandQueue queue = ((QueueThread)Thread.currentThread()).queue;
T result = task.run(queue);
if(mode.equals(FinishAction.FLUSH)) {
queue.flush();
}else if(mode.equals(FinishAction.FINISH)) {
queue.finish();
}
return result;
}
}
/**
* The action executed after a task completes.
*/
public enum FinishAction {
/**
* Does nothing, the task is responsible to make sure all computations
* have finished when the task finishes
*/
DO_NOTHING,
/**
* Flushes the queue on task completion.
*/
FLUSH,
/**
* Finishes the queue on task completion.
*/
FINISH
}
}
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