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.kafka.connect.integration;
  
  import org.apache.kafka.common.utils.MockTime;
  import org.apache.kafka.common.utils.Time;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Tag;
  import org.junit.jupiter.api.Test;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Tag("integration")
  public class StartAndStopLatchTest {
  
      private final AtomicBoolean completed = new AtomicBoolean();
      private Time clock;
      private StartAndStopLatch latch;
      private List<StartAndStopLatch> dependents;
      private ExecutorService waiters;
      private Future<Boolean> future;
  
      @BeforeEach
      public void setup() {
          clock = new MockTime();
          waiters = Executors.newSingleThreadExecutor();
      }
  
      @AfterEach
      public void teardown() {
          if (waiters != null) {
              waiters.shutdownNow();
          }
      }
  
      @Test
      public void shouldReturnFalseWhenAwaitingForStartToNeverComplete() throws Throwable {
          latch = new StartAndStopLatch(1, 1, this::complete, dependents, clock);
          future = asyncAwait(100);
          clock.sleep(10);
          assertFalse(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      @Test
      public void shouldReturnFalseWhenAwaitingForStopToNeverComplete() throws Throwable {
          latch = new StartAndStopLatch(1, 1, this::complete, dependents, clock);
          future = asyncAwait(100);
          latch.recordStart();
          clock.sleep(10);
          assertFalse(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      @Test
      public void shouldReturnTrueWhenAwaitingForStartAndStopToComplete() throws Throwable {
          latch = new StartAndStopLatch(1, 1, this::complete, dependents, clock);
          future = asyncAwait(100);
          latch.recordStart();
          latch.recordStop();
          clock.sleep(10);
          assertTrue(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      @Test
      public void shouldReturnFalseWhenAwaitingForDependentLatchToComplete() throws Throwable {
          StartAndStopLatch depLatch = new StartAndStopLatch(1, 1, this::complete, null, clock);
          dependents = Collections.singletonList(depLatch);
          latch = new StartAndStopLatch(1, 1, this::complete, dependents, clock);
  
          future = asyncAwait(100);
          latch.recordStart();
          latch.recordStop();
          clock.sleep(10);
          assertFalse(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      @Test
      public void shouldReturnTrueWhenAwaitingForStartAndStopAndDependentLatch() throws Throwable {
          StartAndStopLatch depLatch = new StartAndStopLatch(1, 1, this::complete, null, clock);
          dependents = Collections.singletonList(depLatch);
          latch = new StartAndStopLatch(1, 1, this::complete, dependents, clock);
  
          future = asyncAwait(100);
          latch.recordStart();
          latch.recordStop();
          depLatch.recordStart();
          depLatch.recordStop();
          clock.sleep(10);
          assertTrue(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      private Future<Boolean> asyncAwait(long duration) {
          return asyncAwait(duration, TimeUnit.MILLISECONDS);
      }
  
      private Future<Boolean> asyncAwait(long duration, TimeUnit unit) {
          return waiters.submit(() -> {
              try {
                  return latch.await(duration, unit);
              } catch (InterruptedException e) {
                  Thread.interrupted();
                  return false;
              }
          });
      }
  
      private void complete(StartAndStopLatch latch) {
          completed.set(true);
      }
  }
  