/*
    * 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.maven.surefire.api.util.internal;
  
  import java.util.concurrent.Executors;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Creates new daemon Thread.
   */
  public final class DaemonThreadFactory implements ThreadFactory {
      private static final ThreadFactory DEFAULT_THREAD_FACTORY = Executors.defaultThreadFactory();
  
      private static final AtomicInteger POOL_NUMBER = new AtomicInteger(1);
  
      private final AtomicInteger threadNumber = new AtomicInteger(1);
  
      private final String namePrefix;
  
      private DaemonThreadFactory() {
          namePrefix = "pool-" + POOL_NUMBER.getAndIncrement() + "-thread-";
      }
  
      @Override
      public Thread newThread(Runnable r) {
          Thread t = DEFAULT_THREAD_FACTORY.newThread(r);
          t.setName(namePrefix + threadNumber.getAndIncrement());
          t.setDaemon(true);
          return t;
      }
  
      /**
       * Should be used by thread pools.
       * @return new instance of {@link ThreadFactory} where each {@link Thread thread} is daemon
       */
      public static ThreadFactory newDaemonThreadFactory() {
          return new DaemonThreadFactory();
      }
  
      public static ThreadFactory newDaemonThreadFactory(String name) {
          return new NamedThreadFactory(name);
      }
  
      public static Thread newDaemonThread(Runnable r) {
          return new DaemonThreadFactory().newThread(r);
      }
  
      public static Thread newDaemonThread(Runnable r, String name) {
          Thread t = new DaemonThreadFactory().newThread(r);
          t.setName(name);
          return t;
      }
  
      private static class NamedThreadFactory implements ThreadFactory {
          private final String name;
  
          private NamedThreadFactory(String name) {
              this.name = name;
          }
  
          @Override
          public Thread newThread(Runnable r) {
              return newDaemonThread(r, name);
          }
      }
  }