1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package vogar.util; 18 19 import java.util.concurrent.ExecutorService; 20 import java.util.concurrent.LinkedBlockingQueue; 21 import java.util.concurrent.ThreadFactory; 22 import java.util.concurrent.ThreadPoolExecutor; 23 import java.util.concurrent.TimeUnit; 24 import vogar.Log; 25 26 /** 27 * Utility methods for working with threads. 28 */ 29 public final class Threads { Threads()30 private Threads() {} 31 daemonThreadFactory(final String name)32 public static ThreadFactory daemonThreadFactory(final String name) { 33 return new ThreadFactory() { 34 private int nextId = 0; 35 public synchronized Thread newThread(Runnable r) { 36 Thread thread = new Thread(r, name + "-" + (nextId++)); 37 thread.setDaemon(true); 38 return thread; 39 } 40 }; 41 } 42 threadPerCpuExecutor(Log log, String name)43 public static ExecutorService threadPerCpuExecutor(Log log, String name) { 44 return fixedThreadsExecutor(log, name, Runtime.getRuntime().availableProcessors()); 45 } 46 fixedThreadsExecutor(final Log log, String name, int count)47 public static ExecutorService fixedThreadsExecutor(final Log log, String name, int count) { 48 ThreadFactory threadFactory = daemonThreadFactory(name); 49 50 return new ThreadPoolExecutor(count, count, 10, TimeUnit.SECONDS, 51 new LinkedBlockingQueue<Runnable>(Integer.MAX_VALUE), threadFactory) { 52 @Override protected void afterExecute(Runnable runnable, Throwable throwable) { 53 if (throwable != null) { 54 log.info("Unexpected failure from " + runnable, throwable); 55 } 56 } 57 }; 58 } 59 } 60