001/*
002 * Licensed under the Apache License, Version 2.0 (the "License");
003 * you may not use this file except in compliance with the License.
004 * You may obtain a copy of the License at
005 *
006 *     http://www.apache.org/licenses/LICENSE-2.0
007 *
008 * Unless required by applicable law or agreed to in writing, software
009 * distributed under the License is distributed on an "AS IS" BASIS,
010 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
011 * See the License for the specific language governing permissions and
012 * limitations under the License.
013 */
014package org.gbif.utils.concurrent;
015
016import java.util.concurrent.Executors;
017import java.util.concurrent.ThreadFactory;
018import java.util.concurrent.atomic.AtomicInteger;
019
020/**
021 * Modified Executors DefaultThreadFactory to allow custom named thread pools.
022 * Otherwise, this factory yields the same semantics as the thread factory returned by
023 * {@link Executors#defaultThreadFactory()}.
024 *
025 * Optionally a priority or daemon flag can be provided.
026 */
027public class NamedThreadFactory implements ThreadFactory {
028  private final ThreadGroup group;
029  private final AtomicInteger threadNumber = new AtomicInteger(1);
030  private final String namePrefix;
031  private final int priority;
032  private final boolean daemon;
033
034  /**
035   * Creates a new named user thread factory using a normal priority.
036   * @param poolName the name prefix of the thread pool which will be appended -number for the individual thread
037   */
038  public NamedThreadFactory(String poolName) {
039    this(poolName, Thread.NORM_PRIORITY, false);
040  }
041
042  /**
043   * Creates a new named thread factory using explicit priority and daemon settings.
044   */
045  public NamedThreadFactory(String poolName, int priority, boolean daemon) {
046    SecurityManager s = System.getSecurityManager();
047    group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
048    namePrefix = poolName + "-";
049    this.priority = priority;
050    this.daemon = daemon;
051  }
052
053  @Override
054  public Thread newThread(Runnable r) {
055    Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
056    t.setPriority(priority);
057    t.setDaemon(daemon);
058    return t;
059  }
060}