content: /*
   * 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 static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.atomic.AtomicBoolean;
  import org.apache.beam.runners.dataflow.harness.test.TestExecutors.TestExecutorService;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.junit.runners.model.Statement;
  
  /** Tests for {@link TestExecutors}. */
  @RunWith(JUnit4.class)
  @SuppressWarnings({
    "FutureReturnValueIgnored",
  })
  public class TestExecutorsTest {
    @Test
    public void testSuccessfulTermination() throws Throwable {
      ExecutorService service = Executors.newSingleThreadExecutor();
      final TestExecutorService testService = TestExecutors.from(() -> service);
      final AtomicBoolean taskRan = new AtomicBoolean();
      testService
          .apply(
              new Statement() {
                @Override
                public void evaluate() throws Throwable {
                  testService.submit(() -> taskRan.set(true));
                }
              },
              null)
          .evaluate();
      assertTrue(service.isTerminated());
      assertTrue(taskRan.get());
    }
  
    @Test
    public void testTaskBlocksForeverCausesFailure() throws Throwable {
      ExecutorService service = Executors.newSingleThreadExecutor();
      final TestExecutorService testService = TestExecutors.from(() -> service);
      final AtomicBoolean taskStarted = new AtomicBoolean();
      final AtomicBoolean taskWasInterrupted = new AtomicBoolean();
      try {
        testService
            .apply(
                new Statement() {
                  @Override
                  public void evaluate() throws Throwable {
                    testService.submit(this::taskToRun);
                  }
  
                  private void taskToRun() {
                    taskStarted.set(true);
                    try {
                      while (true) {
                        Thread.sleep(10000);
                      }
                    } catch (InterruptedException e) {
                      taskWasInterrupted.set(true);
                      return;
                    }
                  }
                },
                null)
            .evaluate();
        fail();
      } catch (IllegalStateException e) {
        assertEquals(IllegalStateException.class, e.getClass());
        assertEquals("Test executor failed to shutdown cleanly.", e.getMessage());
      }
      assertTrue(service.isShutdown());
    }
  
    @Test
    public void testStatementFailurePropagatedCleanly() throws Throwable {
      ExecutorService service = Executors.newSingleThreadExecutor();
      final TestExecutorService testService = TestExecutors.from(() -> service);
      final RuntimeException exceptionToThrow = new RuntimeException();
      try {
        testService
            .apply(
                new Statement() {
                  @Override
                  public void evaluate() throws Throwable {
                    throw exceptionToThrow;
                  }
                },
                null)
            .evaluate();
        fail();
      } catch (RuntimeException thrownException) {
        assertSame(exceptionToThrow, thrownException);
      }
      assertTrue(service.isShutdown());
    }
  
    @Test
    public void testStatementFailurePropagatedWhenExecutorServiceFailingToTerminate()
        throws Throwable {
      ExecutorService service = Executors.newSingleThreadExecutor();
      final TestExecutorService testService = TestExecutors.from(() -> service);
      final AtomicBoolean taskStarted = new AtomicBoolean();
      final AtomicBoolean taskWasInterrupted = new AtomicBoolean();
      final RuntimeException exceptionToThrow = new RuntimeException();
      try {
        testService
            .apply(
                new Statement() {
                  @Override
                  public void evaluate() throws Throwable {
                    testService.submit(this::taskToRun);
                    throw exceptionToThrow;
                  }
  
                  private void taskToRun() {
                    taskStarted.set(true);
                    try {
                      while (true) {
                        Thread.sleep(10000);
                      }
                    } catch (InterruptedException e) {
                      taskWasInterrupted.set(true);
                      return;
                    }
                  }
                },
                null)
            .evaluate();
        fail();
      } catch (RuntimeException thrownException) {
        assertSame(exceptionToThrow, thrownException);
        assertEquals(1, exceptionToThrow.getSuppressed().length);
        assertEquals(IllegalStateException.class, exceptionToThrow.getSuppressed()[0].getClass());
        assertEquals(
            "Test executor failed to shutdown cleanly.",
            exceptionToThrow.getSuppressed()[0].getMessage());
      }
      assertTrue(service.isShutdown());
    }
  }
  