| /* |
| * 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.beam.runners.dataflow.harness.test; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Supplier; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.ForwardingExecutorService; |
| import org.junit.rules.TestRule; |
| import org.junit.runner.Description; |
| import org.junit.runners.model.Statement; |
| |
| /** |
| * A {@link TestRule} that validates that all submitted tasks finished and were completed. This |
| * allows for testing that tasks have exercised the appropriate shutdown logic. |
| */ |
| public class TestExecutors { |
| public static TestExecutorService from(Supplier<ExecutorService> executorServiceSuppler) { |
| return new FromSupplier(executorServiceSuppler); |
| } |
| |
| /** A union of the {@link ExecutorService} and {@link TestRule} interfaces. */ |
| public interface TestExecutorService extends ExecutorService, TestRule {} |
| |
| private static class FromSupplier extends ForwardingExecutorService |
| implements TestExecutorService { |
| private final Supplier<ExecutorService> executorServiceSupplier; |
| private ExecutorService delegate; |
| |
| private FromSupplier(Supplier<ExecutorService> executorServiceSupplier) { |
| this.executorServiceSupplier = executorServiceSupplier; |
| } |
| |
| @Override |
| public Statement apply(Statement statement, Description arg1) { |
| return new Statement() { |
| @Override |
| public void evaluate() throws Throwable { |
| Throwable thrown = null; |
| delegate = executorServiceSupplier.get(); |
| try { |
| statement.evaluate(); |
| } catch (Throwable t) { |
| thrown = t; |
| } |
| shutdown(); |
| if (!awaitTermination(5, TimeUnit.SECONDS)) { |
| shutdownNow(); |
| IllegalStateException e = |
| new IllegalStateException("Test executor failed to shutdown cleanly."); |
| if (thrown != null) { |
| thrown.addSuppressed(e); |
| } else { |
| thrown = e; |
| } |
| } |
| if (thrown != null) { |
| throw thrown; |
| } |
| } |
| }; |
| } |
| |
| @Override |
| protected ExecutorService delegate() { |
| return delegate; |
| } |
| } |
| } |