1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* 26 * This file is available under and governed by the GNU General Public 27 * License version 2 only, as published by the Free Software Foundation. 28 * However, the following notice accompanied the original version of this 29 * file: 30 * 31 * Written by Doug Lea with assistance from members of JCP JSR-166 32 * Expert Group and released to the public domain, as explained at 33 * http://creativecommons.org/publicdomain/zero/1.0/ 34 */ 35 36 package java.util.concurrent; 37 38 /** 39 * An object that creates new threads on demand. Using thread factories 40 * removes hardwiring of calls to {@link Thread#Thread(Runnable) new Thread}, 41 * enabling applications to use special thread subclasses, priorities, etc. 42 * 43 * <p> 44 * The simplest implementation of this interface is just: 45 * <pre> {@code 46 * class SimpleThreadFactory implements ThreadFactory { 47 * public Thread newThread(Runnable r) { 48 * return new Thread(r); 49 * } 50 * }}</pre> 51 * 52 * The {@link Executors#defaultThreadFactory} method provides a more 53 * useful simple implementation, that sets the created thread context 54 * to known values before returning it. 55 * @since 1.5 56 * @author Doug Lea 57 */ 58 public interface ThreadFactory { 59 60 /** 61 * Constructs a new {@code Thread}. Implementations may also initialize 62 * priority, name, daemon status, {@code ThreadGroup}, etc. 63 * 64 * @param r a runnable to be executed by new thread instance 65 * @return constructed thread, or {@code null} if the request to 66 * create a thread is rejected 67 */ 68 Thread newThread(Runnable r); 69 } 70
