Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.giraph.utils; import com.google.common.util.concurrent.ThreadFactoryBuilder; import java.util.concurrent.Callable; import java.util.concurrent.ExecutorService; import java.util.concurrent.Future; import java.util.concurrent.ThreadFactory; /** * Utility class for thread related functions. */ public class ThreadUtils { /** * Utility class. Do not inherit or create objects. */ private ThreadUtils() { } /** * Creates new thread factory with specified thread name format. * * @param nameFormat defines naming format for threads created by * thread factory * @param exceptionHandler handles uncaught exceptions in all threads * produced created thread factory * @return new thread factory with specified thread name format and * exception handler. */ public static ThreadFactory createThreadFactory(String nameFormat, Thread.UncaughtExceptionHandler exceptionHandler) { ThreadFactoryBuilder builder = new ThreadFactoryBuilder().setNameFormat(nameFormat).setDaemon(true); if (exceptionHandler != null) { builder.setUncaughtExceptionHandler(exceptionHandler); } return builder.build(); } /** * Creates new thread factory with specified thread name format. * * @param nameFormat defines naming format for threads created by * thread factory * @return new thread factory with specified thread name format */ public static ThreadFactory createThreadFactory(String nameFormat) { return createThreadFactory(nameFormat, null); } /** * Submit a callable to executor service, ensuring any exceptions are * caught with provided exception handler. * * When using submit(), UncaughtExceptionHandler which is set on ThreadFactory * isn't used, so we need this utility. * * @param executorService Executor service to submit callable to * @param callable Callable to submit * @param uncaughtExceptionHandler Handler for uncaught exceptions in callable * @param <T> Type of callable result * @return Future for callable */ public static <T> Future<T> submitToExecutor(ExecutorService executorService, Callable<T> callable, Thread.UncaughtExceptionHandler uncaughtExceptionHandler) { return executorService.submit(new LogStacktraceCallable<>(callable, uncaughtExceptionHandler)); } }