ebfc4513e0
Please note that the build will fail at the moment due to various checkstyle violations which should be fixed soon
120 lines
4.2 KiB
Java
120 lines
4.2 KiB
Java
/*
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* Copyright 2011 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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* http://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.internal;
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import java.util.concurrent.Executor;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.TimeUnit;
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/**
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* Shuts down a list of {@link Executor}s. {@link #terminate(Executor...)} will
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* shut down all specified {@link ExecutorService}s immediately and wait for
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* their termination. An {@link Executor} which is not an {@link ExecutorService}
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* will be ignored silently.
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*/
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public final class ExecutorUtil {
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/**
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* Returns {@code true} if and only if the specified {@code executor}
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* is an {@link ExecutorService} and is shut down. Please note that this
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* method returns {@code false} if the specified {@code executor} is not an
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* {@link ExecutorService}.
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*/
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public static boolean isShutdown(Executor executor) {
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if (executor instanceof ExecutorService) {
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if (((ExecutorService) executor).isShutdown()) {
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return true;
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}
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}
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return false;
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}
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/**
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* Shuts down the specified executors.
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*/
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public static void terminate(Executor... executors) {
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// Check nulls.
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if (executors == null) {
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throw new NullPointerException("executors");
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}
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Executor[] executorsCopy = new Executor[executors.length];
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for (int i = 0; i < executors.length; i ++) {
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if (executors[i] == null) {
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throw new NullPointerException("executors[" + i + "]");
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}
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executorsCopy[i] = executors[i];
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}
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// Check dead lock.
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final Executor currentParent = DeadLockProofWorker.PARENT.get();
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if (currentParent != null) {
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for (Executor e: executorsCopy) {
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if (e == currentParent) {
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throw new IllegalStateException(
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"An Executor cannot be shut down from the thread " +
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"acquired from itself. Please make sure you are " +
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"not calling releaseExternalResources() from an " +
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"I/O worker thread.");
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}
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}
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}
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// Shut down all executors.
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boolean interrupted = false;
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for (Executor e: executorsCopy) {
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if (!(e instanceof ExecutorService)) {
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continue;
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}
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ExecutorService es = (ExecutorService) e;
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for (;;) {
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try {
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es.shutdownNow();
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} catch (SecurityException ex) {
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// Running in a restricted environment - fall back.
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try {
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es.shutdown();
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} catch (SecurityException ex2) {
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// Running in a more restricted environment.
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// Can't shut down this executor - skip to the next.
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break;
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} catch (NullPointerException ex2) {
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// Some JDK throws NPE here, but shouldn't.
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}
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} catch (NullPointerException ex) {
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// Some JDK throws NPE here, but shouldn't.
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}
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try {
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if (es.awaitTermination(100, TimeUnit.MILLISECONDS)) {
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break;
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}
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} catch (InterruptedException ex) {
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interrupted = true;
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}
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}
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}
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if (interrupted) {
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Thread.currentThread().interrupt();
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}
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}
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private ExecutorUtil() {
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}
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}
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