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| 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> | |
| 46 | + * class SimpleThreadFactory implements ThreadFactory { | |
| 47 | + * public Thread newThread(Runnable r) { | |
| 48 | + * return new Thread(r); | |
| 49 | + * } | |
| 50 | + * } | |
| 51 | + * </pre> | |
| 52 | + * | |
| 53 | + * The {@link Executors#defaultThreadFactory} method provides a more | |
| 54 | + * useful simple implementation, that sets the created thread context | |
| 55 | + * to known values before returning it. | |
| 56 | + * @since 1.5 | |
| 57 | + * @author Doug Lea | |
| 58 | + */ | |
| 59 | +public interface ThreadFactory { | |
| 60 | + | |
| 61 | + /** | |
| 62 | + * Constructs a new {@code Thread}. Implementations may also initialize | |
| 63 | + * priority, name, daemon status, {@code ThreadGroup}, etc. | |
| 64 | + * | |
| 65 | + * @param r a runnable to be executed by new thread instance | |
| 66 | + * @return constructed thread, or {@code null} if the request to | |
| 67 | + * create a thread is rejected | |
| 68 | + */ | |
| 69 | + Thread newThread(Runnable r); | |
| 70 | +} | |