| /* |
| * 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.flink.util; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** Utilities for {@link java.util.concurrent.Executor Executors}. */ |
| public class ExecutorUtils { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ExecutorUtils.class); |
| |
| /** |
| * Gracefully shutdown the given {@link ExecutorService}. The call waits the given timeout that |
| * all ExecutorServices terminate. If the ExecutorServices do not terminate in this time, they |
| * will be shut down hard. |
| * |
| * @param timeout to wait for the termination of all ExecutorServices |
| * @param unit of the timeout |
| * @param executorServices to shut down |
| */ |
| public static void gracefulShutdown( |
| long timeout, TimeUnit unit, ExecutorService... executorServices) { |
| for (ExecutorService executorService : executorServices) { |
| executorService.shutdown(); |
| } |
| |
| boolean wasInterrupted = false; |
| final long endTime = unit.toMillis(timeout) + System.currentTimeMillis(); |
| long timeLeft = unit.toMillis(timeout); |
| boolean hasTimeLeft = timeLeft > 0L; |
| |
| for (ExecutorService executorService : executorServices) { |
| if (wasInterrupted || !hasTimeLeft) { |
| executorService.shutdownNow(); |
| } else { |
| try { |
| if (!executorService.awaitTermination(timeLeft, TimeUnit.MILLISECONDS)) { |
| LOG.warn( |
| "ExecutorService did not terminate in time. Shutting it down now."); |
| executorService.shutdownNow(); |
| } |
| } catch (InterruptedException e) { |
| LOG.warn( |
| "Interrupted while shutting down executor services. Shutting all " |
| + "remaining ExecutorServices down now.", |
| e); |
| executorService.shutdownNow(); |
| |
| wasInterrupted = true; |
| |
| Thread.currentThread().interrupt(); |
| } |
| |
| timeLeft = endTime - System.currentTimeMillis(); |
| hasTimeLeft = timeLeft > 0L; |
| } |
| } |
| } |
| |
| /** |
| * Shuts the given {@link ExecutorService} down in a non-blocking fashion. The shut down will be |
| * executed by a thread from the common fork-join pool. |
| * |
| * <p>The executor services will be shut down gracefully for the given timeout period. |
| * Afterwards {@link ExecutorService#shutdownNow()} will be called. |
| * |
| * @param timeout before {@link ExecutorService#shutdownNow()} is called |
| * @param unit time unit of the timeout |
| * @param executorServices to shut down |
| * @return Future which is completed once the {@link ExecutorService} are shut down |
| */ |
| public static CompletableFuture<Void> nonBlockingShutdown( |
| long timeout, TimeUnit unit, ExecutorService... executorServices) { |
| return CompletableFuture.supplyAsync( |
| () -> { |
| gracefulShutdown(timeout, unit, executorServices); |
| return null; |
| }); |
| } |
| } |