| /* |
| * 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.runtime; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import org.apache.samza.config.Config; |
| import org.apache.samza.config.TaskConfig; |
| import org.apache.samza.container.SamzaContainerListener; |
| import org.apache.samza.util.ThreadUtil; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| public class ClusterBasedProcessorLifecycleListener implements SamzaContainerListener { |
| private static final Logger log = LoggerFactory.getLogger(ClusterBasedProcessorLifecycleListener.class); |
| private final Runnable shutdownHookCallback; |
| private Thread shutdownHookThread = null; |
| private CountDownLatch shutdownLatch = new CountDownLatch(1); |
| private TaskConfig taskConfig; |
| private ProcessorLifecycleListener processorLifecycleListener; |
| private volatile Throwable containerException = null; |
| |
| ClusterBasedProcessorLifecycleListener(Config config, ProcessorLifecycleListener processorLifecycleListener, |
| Runnable shutdownHookCallback) { |
| this.taskConfig = new TaskConfig(config); |
| this.processorLifecycleListener = processorLifecycleListener; |
| this.shutdownHookCallback = shutdownHookCallback; |
| } |
| |
| @Override |
| public void beforeStart() { |
| log.info("Before starting the container."); |
| addShutdownHook(); |
| processorLifecycleListener.beforeStart(); |
| } |
| |
| @Override |
| public void afterStart() { |
| log.info("Container Started"); |
| processorLifecycleListener.afterStart(); |
| } |
| |
| @Override |
| public void afterStop() { |
| log.info("Container Stopped"); |
| processorLifecycleListener.afterStop(); |
| removeShutdownHook(); |
| shutdownLatch.countDown(); |
| } |
| |
| @Override |
| public void afterFailure(Throwable t) { |
| log.info("Container Failed"); |
| containerException = t; |
| processorLifecycleListener.afterFailure(t); |
| removeShutdownHook(); |
| shutdownLatch.countDown(); |
| } |
| |
| Throwable getContainerException() { |
| return containerException; |
| } |
| |
| private void removeShutdownHook() { |
| removeJVMShutdownHook(shutdownHookThread); |
| } |
| |
| private void addShutdownHook() { |
| shutdownHookThread = new Thread("Samza Container Shutdown Hook Thread") { |
| @Override |
| public void run() { |
| long shutdownMs = taskConfig.getShutdownMs(); |
| log.info("Attempting to shutdown container from inside shutdownHook, will wait up to {} ms.", shutdownMs); |
| try { |
| shutdownHookCallback.run(); |
| boolean hasShutdown = shutdownLatch.await(shutdownMs, TimeUnit.MILLISECONDS); |
| if (hasShutdown) { |
| log.info("Shutdown complete"); |
| } else { |
| log.error("Did not shut down within {} ms, exiting.", shutdownMs); |
| ThreadUtil.logThreadDump("Thread dump from Samza Container Shutdown Hook."); |
| } |
| } catch (InterruptedException e) { |
| log.error("Shutdown hook inturrupted while waiting on runLoop to shutdown"); |
| ThreadUtil.logThreadDump("Thread dump from Samza Container Shutdown Hook."); |
| } |
| } |
| }; |
| addJVMShutdownHook(shutdownHookThread); |
| } |
| |
| @VisibleForTesting |
| Thread getShutdownHookThread() { |
| return this.shutdownHookThread; |
| } |
| |
| @VisibleForTesting |
| void addJVMShutdownHook(Thread shutdownHookThread) { |
| if (shutdownHookThread != null) { |
| Runtime.getRuntime().addShutdownHook(shutdownHookThread); |
| log.info("Added Samza container shutdown hook"); |
| } |
| } |
| |
| @VisibleForTesting |
| void removeJVMShutdownHook(Thread shutdownHookThread) { |
| try { |
| if (shutdownHookThread != null) { |
| Runtime.getRuntime().removeShutdownHook(shutdownHookThread); |
| log.info("Removed Samza container shutdown hook"); |
| } |
| } catch (IllegalStateException e) { |
| // Thrown when then JVM is already shutting down, so safe to ignore. |
| } |
| } |
| } |