org.apache.catalina.tribes.util.TcclThreadFactory Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.catalina.tribes.util;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* ThreadFactory implementation that creates threads with the thread context class loader set to the class loader that
* loaded this factory. It is intended to be used when tasks may be passed to executors when the web application class
* loader is set as the thread context class loader, such as in async session replication.
*/
public class TcclThreadFactory implements ThreadFactory {
private static final AtomicInteger poolNumber = new AtomicInteger(1);
private static final boolean IS_SECURITY_ENABLED = (System.getSecurityManager() != null);
private final ThreadGroup group;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final String namePrefix;
public TcclThreadFactory() {
this("pool-" + poolNumber.getAndIncrement() + "-thread-");
}
public TcclThreadFactory(String namePrefix) {
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
this.namePrefix = namePrefix;
}
@Override
public Thread newThread(Runnable r) {
final Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement());
if (IS_SECURITY_ENABLED) {
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Void run() {
t.setContextClassLoader(this.getClass().getClassLoader());
return null;
}
});
} else {
t.setContextClassLoader(this.getClass().getClassLoader());
}
t.setDaemon(true);
return t;
}
}