| /* |
| * 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.samza.util; |
| |
| import java.lang.Thread.UncaughtExceptionHandler; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * An UncaughtExceptionHandler that logs the uncaught exception, logs a thread dump, and then |
| * executes the provided {@code runnable}. |
| * <p> |
| * Example usage: Exit process if any thread throws an uncaught exception: |
| * <pre> |
| * Thread.setDefaultUncaughtExceptionHandler( |
| * new SamzaUncaughtExceptionHandler(() -> { |
| * System.exit(1); |
| * }) |
| * ); |
| * </pre> |
| */ |
| public class SamzaUncaughtExceptionHandler implements UncaughtExceptionHandler { |
| private static final Logger LOGGER = LoggerFactory.getLogger(SamzaUncaughtExceptionHandler.class); |
| private final Runnable runnable; |
| |
| public SamzaUncaughtExceptionHandler(Runnable runnable) { |
| this.runnable = runnable; |
| } |
| /** |
| * Method invoked when the given thread terminates due to the |
| * given uncaught exception. |
| * <p>Any exception thrown by this method will be ignored by the |
| * Java Virtual Machine. |
| * |
| * @param t the thread |
| * @param e the exception |
| */ |
| @Override |
| public void uncaughtException(Thread t, Throwable e) { |
| String msg = String.format("Uncaught exception in thread %s.", t.getName()); |
| LOGGER.error(msg, e); |
| System.err.println(msg); |
| e.printStackTrace(System.err); |
| try { |
| ThreadUtil.logThreadDump("Thread dump from uncaught exception handler."); |
| runnable.run(); |
| } catch (Throwable throwable) { |
| // Ignore to avoid further exception propagation |
| } |
| } |
| } |