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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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
 *
 *     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.activemq.artemis.utils;

import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

public final class ActiveMQThreadFactory implements ThreadFactory {

   private final ThreadGroup group;

   private final AtomicInteger threadCount = new AtomicInteger(0);

   private final int threadPriority;

   private final boolean daemon;

   private final ClassLoader tccl;

   private final AccessControlContext acc;

   /**
    * Construct a new instance.  The access control context of the calling thread will be the one used to create
    * new threads if a security manager is installed.
    *
    * @param groupName the name of the thread group to assign threads to by default
    * @param daemon whether the created threads should be daemon threads
    * @param tccl the context class loader of newly created threads
    */
   public ActiveMQThreadFactory(final String groupName, final boolean daemon, final ClassLoader tccl) {
      group = new ThreadGroup(groupName + "-" + System.identityHashCode(this));

      this.threadPriority = Thread.NORM_PRIORITY;

      this.tccl = tccl;

      this.daemon = daemon;

      this.acc = AccessController.getContext();
   }

   public Thread newThread(final Runnable command) {
      // create a thread in a privileged block if running with Security Manager
      if (acc != null) {
         return AccessController.doPrivileged(new ThreadCreateAction(command), acc);
      }
      else {
         return createThread(command);
      }
   }

   private final class ThreadCreateAction implements PrivilegedAction {

      private final Runnable target;

      private ThreadCreateAction(final Runnable target) {
         this.target = target;
      }

      public Thread run() {
         return createThread(target);
      }
   }

   private Thread createThread(final Runnable command) {
      final Thread t = new Thread(group, command, "Thread-" + threadCount.getAndIncrement() + " (" + group.getName() + ")");
      t.setDaemon(daemon);
      t.setPriority(threadPriority);
      t.setContextClassLoader(tccl);
      return t;
   }

}