164 lines
5.2 KiB
Java
164 lines
5.2 KiB
Java
/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.concurrent;
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import static java.util.Objects.requireNonNull;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.util.ArrayDeque;
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import java.util.Queue;
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import java.util.concurrent.Callable;
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import java.util.concurrent.TimeUnit;
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/**
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* Executes {@link Runnable} objects in the caller's thread. If the {@link #execute(Runnable)} is reentrant it will be
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* queued until the original {@link Runnable} finishes execution.
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* <p>
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* All {@link Throwable} objects thrown from {@link #execute(Runnable)} will be swallowed and logged. This is to ensure
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* that all queued {@link Runnable} objects have the chance to be run.
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*/
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public final class ImmediateEventExecutor extends AbstractEventExecutor {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(ImmediateEventExecutor.class);
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public static final ImmediateEventExecutor INSTANCE = new ImmediateEventExecutor();
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/**
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* A Runnable will be queued if we are executing a Runnable. This is to prevent a {@link StackOverflowError}.
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*/
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private static final FastThreadLocal<Queue<Runnable>> DELAYED_RUNNABLES = new FastThreadLocal<Queue<Runnable>>() {
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@Override
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protected Queue<Runnable> initialValue() throws Exception {
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return new ArrayDeque<>();
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}
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};
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/**
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* Set to {@code true} if we are executing a runnable.
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*/
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private static final FastThreadLocal<Boolean> RUNNING = new FastThreadLocal<Boolean>() {
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@Override
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protected Boolean initialValue() throws Exception {
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return false;
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}
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};
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private final Future<?> terminationFuture = DefaultPromise.newFailedPromise(
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GlobalEventExecutor.INSTANCE, new UnsupportedOperationException()).asFuture();
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private ImmediateEventExecutor() { }
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@Override
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public boolean inEventLoop(Thread thread) {
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return true;
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}
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@Override
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public Future<?> shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
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return terminationFuture();
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}
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@Override
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public Future<?> terminationFuture() {
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return terminationFuture;
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}
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@Override
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@Deprecated
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public void shutdown() { }
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@Override
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public boolean isShuttingDown() {
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return false;
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}
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@Override
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public boolean isShutdown() {
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return false;
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}
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@Override
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public boolean isTerminated() {
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return false;
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}
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@Override
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public boolean awaitTermination(long timeout, TimeUnit unit) {
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return false;
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}
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@Override
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public void execute(Runnable command) {
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requireNonNull(command, "command");
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if (!RUNNING.get()) {
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RUNNING.set(true);
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try {
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command.run();
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} catch (Throwable cause) {
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logger.info("Throwable caught while executing Runnable {}", command, cause);
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} finally {
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Queue<Runnable> delayedRunnables = DELAYED_RUNNABLES.get();
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Runnable runnable;
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while ((runnable = delayedRunnables.poll()) != null) {
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try {
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runnable.run();
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} catch (Throwable cause) {
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logger.info("Throwable caught while executing Runnable {}", runnable, cause);
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}
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}
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RUNNING.set(false);
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}
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} else {
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DELAYED_RUNNABLES.get().add(command);
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}
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}
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@Override
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public <V> Promise<V> newPromise() {
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return new ImmediatePromise<>(this);
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}
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@Override
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public ScheduledFuture<?> schedule(Runnable command, long delay,
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TimeUnit unit) {
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throw new UnsupportedOperationException();
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}
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@Override
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public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay, TimeUnit unit) {
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throw new UnsupportedOperationException();
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}
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@Override
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public ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
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throw new UnsupportedOperationException();
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}
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@Override
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public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
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throw new UnsupportedOperationException();
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}
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static class ImmediatePromise<V> extends DefaultPromise<V> {
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ImmediatePromise(EventExecutor executor) {
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super(executor);
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}
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@Override
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protected void checkDeadLock() {
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// No check
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}
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}
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}
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