co.paralleluniverse.fibers.FiberExecutorScheduler Maven / Gradle / Ivy
/*
* Quasar: lightweight threads and actors for the JVM.
* Copyright (c) 2013-2016, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.fibers;
import co.paralleluniverse.common.monitoring.MonitorType;
import co.paralleluniverse.strands.Strand;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* A fiber scheduler that uses a given {@link Executor} for scheduling.
*
* The {@code Runnable} tasks passed to the {@link Executor} for execution,
* implement the {@link FiberSchedulerTask} interface.
*
* @author pron
*/
public class FiberExecutorScheduler extends FiberScheduler implements Executor {
private final Executor executor;
private final FiberTimedScheduler timer;
/**
* Creates a new fiber scheduler.
*
* @param name the scheuler's name. This name is used in naming the scheduler's threads.
* @param executor an {@link Executor} used to schedule the fibers;
* may be {@code null} if the {@link #execute(Runnable)} method is overriden.
* @param monitorType the {@link MonitorType} type to use for the scheduler.
* @param detailedInfo whether detailed information about the fibers is collected by the fibers monitor.
*/
public FiberExecutorScheduler(String name, Executor executor, MonitorType monitorType, boolean detailedInfo) {
super(name, monitorType, detailedInfo);
this.executor = executor;
this.timer = new FiberTimedScheduler(this,
new ThreadFactoryBuilder().setDaemon(true).setNameFormat("FiberTimedScheduler-" + getName()).build(),
getMonitor());
}
/**
* Creates a new fiber scheduler with no monitor.
*
* @param name the scheuler's name. This name is used in naming the scheduler's threads.
* @param executor an {@link Executor} used to schedule the fibers;
* may be {@code null} if the {@link #execute(Runnable)} method is overriden.
*/
public FiberExecutorScheduler(String name, Executor executor) {
this(name, executor, null, false);
}
public void shutdown() {
this.timer.shutdown();
super.shutdown();
}
@Override
protected boolean isCurrentThreadInScheduler() {
return false;
}
@Override
protected int getQueueLength() {
if (executor instanceof ThreadPoolExecutor) {
return ((ThreadPoolExecutor) executor).getQueue().size();
}
return -1;
}
@Override
public void execute(Runnable command) {
executor.execute(command);
}
@Override
protected Map getRunningFibers() {
return null;
}
@Override
public Executor getExecutor() {
return executor != null ? executor : this;
}
@Override
Future schedule(Fiber fiber, Object blocker, long delay, TimeUnit unit) {
return timer.schedule(fiber, blocker, delay, unit);
}
@Override
FiberTask newFiberTask(Fiber fiber) {
return new RunnableFiberTask(fiber, this);
}
@Override
int getTimedQueueLength() {
return timer.getQueueLength();
}
@Override
void setCurrentFiber(Fiber target, Thread currentThread) {
Fiber.setCurrentStrand(target);
}
@Override
void setCurrentTarget(Object target, Thread currentThread) {
Fiber.setCurrentStrand((Strand) target);
}
@Override
Object getCurrentTarget(Thread currentThread) {
return Fiber.getCurrentStrand();
}
}