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  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.catalina.tribes.util;
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-" + .getAndIncrement() + "-thread-");
    public TcclThreadFactory(String namePrefix) {
        SecurityManager s = System.getSecurityManager();
         = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
        this. = namePrefix;
    public Thread newThread(Runnable r) {
        final Thread t = new Thread(r + .getAndIncrement());
        if () {
            AccessController.doPrivileged(new PrivilegedAction<Void>() {
                public Void run() {
                    return null;
        } else {
        return t;
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