com.sun.xml.ws.api.pipe.ThreadHelper Maven / Gradle / Ivy
/*
* Copyright (c) 2015, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.ws.api.pipe;
import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.ThreadFactory;
/**
* Simple utility class to instantiate correct Thread instance
* depending on Java version.
*
* @author [email protected]
*/
final class ThreadHelper {
private static final String SAFE_THREAD_NAME = "sun.misc.ManagedLocalsThread";
private static final ThreadFactory threadFactory;
// no instantiating wanted
private ThreadHelper() {
}
static {
threadFactory = AccessController.doPrivileged(
new PrivilegedAction () {
@Override
public ThreadFactory run() {
// In order of preference
try {
try {
Class cls = Thread.class;
Constructor ctr = cls.getConstructor(
ThreadGroup.class,
Runnable.class,
String.class,
long.class,
boolean.class);
return new JDK9ThreadFactory(ctr);
} catch (NoSuchMethodException ignored) {
// constructor newly added in Java SE 9
}
Class cls = Class.forName(SAFE_THREAD_NAME);
Constructor ctr = cls.getConstructor(Runnable.class);
return new SunMiscThreadFactory(ctr);
} catch (ClassNotFoundException | NoSuchMethodException ignored) {}
return new LegacyThreadFactory();
}
}
);
}
static Thread createNewThread(final Runnable r) {
return threadFactory.newThread(r);
}
// A Thread factory backed by the Thread constructor that
// suppresses inheriting of inheritable thread-locals.
private static class JDK9ThreadFactory implements ThreadFactory {
final Constructor ctr;
JDK9ThreadFactory(Constructor ctr) { this.ctr = ctr; }
@Override public Thread newThread(Runnable r) {
try {
return ctr.newInstance(null, r, "toBeReplaced", 0, false);
} catch (ReflectiveOperationException x) {
InternalError ie = new InternalError(x.getMessage());
ie.initCause(ie);
throw ie;
}
}
}
// A Thread factory backed by sun.misc.ManagedLocalsThread
private static class SunMiscThreadFactory implements ThreadFactory {
final Constructor ctr;
SunMiscThreadFactory(Constructor ctr) { this.ctr = ctr; }
@Override public Thread newThread(final Runnable r) {
return AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public Thread run() {
try {
return (Thread) ctr.newInstance(r);
} catch (Exception e) {
return new Thread(r);
}
}
}
);
}
}
// A Thread factory backed by new Thread(Runnable)
private static class LegacyThreadFactory implements ThreadFactory {
@Override public Thread newThread(Runnable r) {
return new Thread(r);
}
}
}