11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2010 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * you may not use this file except in compliance with the License. 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * You may obtain a copy of the License at 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * distributed under the License is distributed on an "AS IS" BASIS, 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See the License for the specific language governing permissions and 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.util.concurrent; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static java.util.logging.Level.SEVERE; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.VisibleForTesting; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.Thread.UncaughtExceptionHandler; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.logging.Logger; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Factories for {@link UncaughtExceptionHandler} instances. 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Gregory Kick 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 8.0 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic final class UncaughtExceptionHandlers { 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private UncaughtExceptionHandlers() {} 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns an exception handler that exits the system. This is particularly useful for the main 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * thread, which may start up other, non-daemon threads, but fail to fully initialize the 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * application successfully. 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Example usage: 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <pre>public static void main(String[] args) { 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Thread.currentThread().setUncaughtExceptionHandler(UncaughtExceptionHandlers.systemExit()); 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * ... 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * </pre> 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static UncaughtExceptionHandler systemExit() { 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new Exiter(Runtime.getRuntime()); 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @VisibleForTesting static final class Exiter implements UncaughtExceptionHandler { 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final Logger logger = Logger.getLogger(Exiter.class.getName()); 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private final Runtime runtime; 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Exiter(Runtime runtime) { 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.runtime = runtime; 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public void uncaughtException(Thread t, Throwable e) { 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // cannot use FormattingLogger due to a dependency loop 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert logger.log(SEVERE, String.format("Caught an exception in %s. Shutting down.", t), e); 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert runtime.exit(1); 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 66