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/*
* Copyright 2016 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.util.concurrent;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.Delayed;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.RunnableScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
/**
* {@link EventExecutor} implementation which makes no guarantees about the ordering of task execution that
* are submitted because there may be multiple threads executing these tasks.
* This implementation is most useful for protocols that do not need strict ordering.
*
* Because it provides no ordering care should be taken when using it!
*/
public final class UnorderedThreadPoolEventExecutor extends ScheduledThreadPoolExecutor implements EventExecutor {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(
UnorderedThreadPoolEventExecutor.class);
private final Promise terminationFuture = GlobalEventExecutor.INSTANCE.newPromise();
private final Set executorSet = Collections.singleton((EventExecutor) this);
/**
* Calls {@link UnorderedThreadPoolEventExecutor#UnorderedThreadPoolEventExecutor(int, ThreadFactory)}
* using {@link DefaultThreadFactory}.
*/
public UnorderedThreadPoolEventExecutor(int corePoolSize) {
this(corePoolSize, new DefaultThreadFactory(UnorderedThreadPoolEventExecutor.class));
}
/**
* See {@link ScheduledThreadPoolExecutor#ScheduledThreadPoolExecutor(int, ThreadFactory)}
*/
public UnorderedThreadPoolEventExecutor(int corePoolSize, ThreadFactory threadFactory) {
super(corePoolSize, threadFactory);
}
/**
* Calls {@link UnorderedThreadPoolEventExecutor#UnorderedThreadPoolEventExecutor(int,
* ThreadFactory, java.util.concurrent.RejectedExecutionHandler)} using {@link DefaultThreadFactory}.
*/
public UnorderedThreadPoolEventExecutor(int corePoolSize, RejectedExecutionHandler handler) {
this(corePoolSize, new DefaultThreadFactory(UnorderedThreadPoolEventExecutor.class), handler);
}
/**
* See {@link ScheduledThreadPoolExecutor#ScheduledThreadPoolExecutor(int, ThreadFactory, RejectedExecutionHandler)}
*/
public UnorderedThreadPoolEventExecutor(int corePoolSize, ThreadFactory threadFactory,
RejectedExecutionHandler handler) {
super(corePoolSize, threadFactory, handler);
}
@Override
public EventExecutor next() {
return this;
}
@Override
public EventExecutorGroup parent() {
return this;
}
@Override
public boolean inEventLoop() {
return false;
}
@Override
public boolean inEventLoop(Thread thread) {
return false;
}
@Override
public Promise newPromise() {
return new DefaultPromise(this);
}
@Override
public ProgressivePromise newProgressivePromise() {
return new DefaultProgressivePromise(this);
}
@Override
public Future newSucceededFuture(V result) {
return new SucceededFuture(this, result);
}
@Override
public Future newFailedFuture(Throwable cause) {
return new FailedFuture(this, cause);
}
@Override
public boolean isShuttingDown() {
return isShutdown();
}
@Override
public List shutdownNow() {
List tasks = super.shutdownNow();
terminationFuture.trySuccess(null);
return tasks;
}
@Override
public void shutdown() {
super.shutdown();
terminationFuture.trySuccess(null);
}
@Override
public Future shutdownGracefully() {
return shutdownGracefully(2, 15, TimeUnit.SECONDS);
}
@Override
public Future shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
// TODO: At the moment this just calls shutdown but we may be able to do something more smart here which
// respects the quietPeriod and timeout.
shutdown();
return terminationFuture();
}
@Override
public Future terminationFuture() {
return terminationFuture;
}
@Override
public Iterator iterator() {
return executorSet.iterator();
}
@Override
protected RunnableScheduledFuture decorateTask(Runnable runnable, RunnableScheduledFuture task) {
return runnable instanceof NonNotifyRunnable ?
task : new RunnableScheduledFutureTask(this, runnable, task);
}
@Override
protected RunnableScheduledFuture decorateTask(Callable callable, RunnableScheduledFuture task) {
return new RunnableScheduledFutureTask(this, callable, task);
}
@Override
public ScheduledFuture schedule(Runnable command, long delay, TimeUnit unit) {
return (ScheduledFuture) super.schedule(command, delay, unit);
}
@Override
public ScheduledFuture schedule(Callable callable, long delay, TimeUnit unit) {
return (ScheduledFuture) super.schedule(callable, delay, unit);
}
@Override
public ScheduledFuture scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
return (ScheduledFuture) super.scheduleAtFixedRate(command, initialDelay, period, unit);
}
@Override
public ScheduledFuture scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
return (ScheduledFuture) super.scheduleWithFixedDelay(command, initialDelay, delay, unit);
}
@Override
public Future submit(Runnable task) {
return (Future) super.submit(task);
}
@Override
public Future submit(Runnable task, T result) {
return (Future) super.submit(task, result);
}
@Override
public Future submit(Callable task) {
return (Future) super.submit(task);
}
@Override
public void execute(Runnable command) {
super.schedule(new NonNotifyRunnable(command), 0, NANOSECONDS);
}
private static final class RunnableScheduledFutureTask extends PromiseTask
implements RunnableScheduledFuture, ScheduledFuture {
private final RunnableScheduledFuture future;
RunnableScheduledFutureTask(EventExecutor executor, Runnable runnable,
RunnableScheduledFuture future) {
super(executor, runnable, null);
this.future = future;
}
RunnableScheduledFutureTask(EventExecutor executor, Callable callable,
RunnableScheduledFuture future) {
super(executor, callable);
this.future = future;
}
@Override
public void run() {
if (!isPeriodic()) {
super.run();
} else if (!isDone()) {
try {
// Its a periodic task so we need to ignore the return value
task.call();
} catch (Throwable cause) {
if (!tryFailureInternal(cause)) {
logger.warn("Failure during execution of task", cause);
}
}
}
}
@Override
public boolean isPeriodic() {
return future.isPeriodic();
}
@Override
public long getDelay(TimeUnit unit) {
return future.getDelay(unit);
}
@Override
public int compareTo(Delayed o) {
return future.compareTo(o);
}
}
// This is a special wrapper which we will be used in execute(...) to wrap the submitted Runnable. This is needed as
// ScheduledThreadPoolExecutor.execute(...) will delegate to submit(...) which will then use decorateTask(...).
// The problem with this is that decorateTask(...) needs to ensure we only do our own decoration if we not call
// from execute(...) as otherwise we may end up creating an endless loop because DefaultPromise will call
// EventExecutor.execute(...) when notify the listeners of the promise.
//
// See https://github.com/netty/netty/issues/6507
private static final class NonNotifyRunnable implements Runnable {
private final Runnable task;
NonNotifyRunnable(Runnable task) {
this.task = task;
}
@Override
public void run() {
task.run();
}
}
}
