001/*
002 * Copyright 2021 Global Biodiversity Information Facility (GBIF)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.gbif.utils.concurrent;
017
018import java.util.concurrent.Executors;
019import java.util.concurrent.ThreadFactory;
020import java.util.concurrent.atomic.AtomicInteger;
021
022/**
023 * Modified Executors DefaultThreadFactory to allow custom named thread pools.
024 * Otherwise, this factory yields the same semantics as the thread factory returned by
025 * {@link Executors#defaultThreadFactory()}.
026 *
027 * Optionally a priority or daemon flag can be provided.
028 */
029public class NamedThreadFactory implements ThreadFactory {
030  private final ThreadGroup group;
031  private final AtomicInteger threadNumber = new AtomicInteger(1);
032  private final String namePrefix;
033  private final int priority;
034  private final boolean daemon;
035
036
037  /**
038   * Creates a new named user thread factory using a normal priority.
039   * @param poolName the name prefix of the thread pool which will be appended -number for the individual thread
040   */
041  public NamedThreadFactory(String poolName) {
042    this(poolName, Thread.NORM_PRIORITY, false);
043  }
044
045  /**
046   * Creates a new named thread factory using explicit priority and daemon settings.
047   */
048  public NamedThreadFactory(String poolName, int priority, boolean daemon) {
049    SecurityManager s = System.getSecurityManager();
050    group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
051    namePrefix = poolName + "-";
052    this.priority = priority;
053    this.daemon = daemon;
054  }
055
056  @Override
057  public Thread newThread(Runnable r) {
058    Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
059    t.setPriority(priority);
060    t.setDaemon(daemon);
061    return t;
062  }
063}