org.glassfish.jersey.internal.guava.MoreExecutors Maven / Gradle / Ivy
/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed 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 org.glassfish.jersey.internal.guava;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy;
/**
* Factory and utility methods for {@link Executor}, {@link
* ExecutorService}, and {@link ThreadFactory}.
*
* @author Eric Fellheimer
* @author Kyle Littlefield
* @author Justin Mahoney
* @since 3.0
*/
public final class MoreExecutors {
private MoreExecutors() {
}
/**
* Returns an {@link Executor} that runs each task in the thread that invokes
* {@link Executor#execute execute}, as in {@link CallerRunsPolicy}.
*
*
This instance is equivalent to:
{@code
* final class DirectExecutor implements Executor {
* public void execute(Runnable r) {
* r.run();
* }
* }}
*
*
This should be preferred to {@link #newDirectExecutorService()} because the implementing the
* {@link ExecutorService} subinterface necessitates significant performance overhead.
*
* @since 18.0
*/
public static Executor directExecutor() {
return DirectExecutor.INSTANCE;
}
/**
* See {@link #directExecutor} for behavioral notes.
*/
private enum DirectExecutor implements Executor {
INSTANCE;
@Override
public void execute(Runnable command) {
command.run();
}
}
/*
* This following method is a modified version of one found in
* http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
* which contained the following notice:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
}