001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.wake.impl; 020 021import java.util.concurrent.ThreadFactory; 022import java.util.concurrent.atomic.AtomicInteger; 023 024/** 025 * A default thread factory implementation that names created threads. 026 */ 027public final class DefaultThreadFactory implements ThreadFactory { 028 029 private static final AtomicInteger POOL_NUMBER = new AtomicInteger(1); 030 031 private final ThreadGroup group; 032 private final AtomicInteger threadNumber = new AtomicInteger(1); 033 private final String prefix; 034 035 private Thread.UncaughtExceptionHandler uncaughtExceptionHandler; 036 037 /** 038 * Constructs a default thread factory. 039 * 040 * @param prefix the name prefix of the created thread 041 */ 042 public DefaultThreadFactory(final String prefix) { 043 this(prefix, null); 044 } 045 046 /** 047 * Constructs a default thread factory. 048 * 049 * @param prefix the name prefix of the created thread 050 * @param uncaughtExceptionHandler the uncaught exception handler of the created thread 051 */ 052 public DefaultThreadFactory(final String prefix, final Thread.UncaughtExceptionHandler uncaughtExceptionHandler) { 053 final SecurityManager s = System.getSecurityManager(); 054 this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup(); 055 this.prefix = String.format("%s:pool-%02d", prefix, POOL_NUMBER.getAndIncrement()); 056 this.uncaughtExceptionHandler = uncaughtExceptionHandler; 057 } 058 059 /** 060 * Sets a uncaught exception handler. 061 * 062 * @param uncaughtExceptionHandler the uncaught exception handler 063 */ 064 public void setUncaughtExceptionHandler(final Thread.UncaughtExceptionHandler uncaughtExceptionHandler) { 065 this.uncaughtExceptionHandler = uncaughtExceptionHandler; 066 } 067 068 /** 069 * Creates a new thread. 070 * 071 * @param r the runnable 072 */ 073 @Override 074 public Thread newThread(final Runnable r) { 075 076 final Thread t = new Thread(this.group, r, 077 String.format("%s:thread-%03d", this.prefix, this.threadNumber.getAndIncrement()), 0); 078 079 if (t.isDaemon()) { 080 t.setDaemon(false); 081 } 082 083 if (t.getPriority() != Thread.NORM_PRIORITY) { 084 t.setPriority(Thread.NORM_PRIORITY); 085 } 086 087 if (this.uncaughtExceptionHandler != null) { 088 t.setUncaughtExceptionHandler(this.uncaughtExceptionHandler); 089 } 090 091 return t; 092 } 093}