1bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/* 2bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Copyright (C) 2006 Google Inc. 3bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 4bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Licensed under the Apache License, Version 2.0 (the "License"); 5bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * you may not use this file except in compliance with the License. 6bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * You may obtain a copy of the License at 7bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 8bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * http://www.apache.org/licenses/LICENSE-2.0 9bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 10bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Unless required by applicable law or agreed to in writing, software 11bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * distributed under the License is distributed on an "AS IS" BASIS, 12bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * See the License for the specific language governing permissions and 14bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * limitations under the License. 15bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 16bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 17bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpackage com.google.common.util.concurrent; 18bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 19bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.concurrent.Executors; 20bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.concurrent.ThreadFactory; 21bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.concurrent.atomic.AtomicInteger; 22bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 23bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 24bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * A ThreadFactory which decorates another ThreadFactory to set a name on 25bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * each thread created. 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 27bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Kevin Bourrillion 28bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @since 2009.09.15 <b>tentative</b> 29bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 30bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic class NamingThreadFactory implements ThreadFactory { 31bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private final ThreadFactory backingFactory; 32bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private final String format; 33bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private final AtomicInteger count = new AtomicInteger(0); 34bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 35bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static final ThreadFactory DEFAULT_FACTORY 36bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor = Executors.defaultThreadFactory(); 37bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 38bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 39bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Creates a new factory that delegates to the default thread factory for 40bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * thread creation, then uses {@code format} to construct a name for the new 41bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * thread. 42bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 43bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param format a {@link String#format(String, Object...)}-compatible format 44bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * String, to which a unique integer (0, 1, etc.) will be supplied as the 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * single parameter. This integer will be unique to this instance of 46bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NamingThreadFactory and will be assigned sequentially. 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public NamingThreadFactory(String format) { 49bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(format, DEFAULT_FACTORY); 50bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 51bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 52bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 53bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Creates a new factory that delegates to {@code backingFactory} for thread 54bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * creation, then uses {@code format} to construct a name for the new thread. 55bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 56bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param format a {@link String#format(String, Object...)}-compatible format 57bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * String, to which a unique integer (0, 1, etc.) will be supplied as the 58bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * single parameter 59bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param backingFactory the factory that will actually create the threads 60bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws java.util.IllegalFormatException if {@code format} is invalid 61bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 62bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public NamingThreadFactory(String format, ThreadFactory backingFactory) { 63bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.format = format; 64bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.backingFactory = backingFactory; 65bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor makeName(0); // fail fast if format is bad 66bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 67bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 68bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public Thread newThread(Runnable r) { 69bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor Thread t = backingFactory.newThread(r); 70bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor t.setName(makeName(count.getAndIncrement())); 71bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return t; 72bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 73bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 74bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private String makeName(int ordinal) { 75bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return String.format(format, ordinal); 76bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 77bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 78