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.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Tag("integration")
  public class StartAndStopCounterTest {
  
      private StartAndStopCounter counter;
      private Time clock;
      private ExecutorService waiters;
      private StartAndStopLatch latch;
  
      @BeforeEach
      public void setup() {
          clock = new MockTime();
          counter = new StartAndStopCounter(clock);
      }
  
      @AfterEach
      public void teardown() {
          if (waiters != null) {
              try {
                  waiters.shutdownNow();
              } finally {
                  waiters = null;
              }
          }
      }
  
      @Test
      public void shouldRecordStarts() {
          assertEquals(0, counter.starts());
          counter.recordStart();
          assertEquals(1, counter.starts());
          counter.recordStart();
          assertEquals(2, counter.starts());
          assertEquals(2, counter.starts());
      }
  
      @Test
      public void shouldRecordStops() {
          assertEquals(0, counter.stops());
          counter.recordStop();
          assertEquals(1, counter.stops());
          counter.recordStop();
          assertEquals(2, counter.stops());
          assertEquals(2, counter.stops());
      }
  
      @Test
      public void shouldExpectRestarts() throws Exception {
          waiters = Executors.newSingleThreadExecutor();
  
          latch = counter.expectedRestarts(1);
          Future<Boolean> future = asyncAwait(100, TimeUnit.MILLISECONDS);
  
          clock.sleep(1000);
          counter.recordStop();
          counter.recordStart();
          assertTrue(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
      @Test
      public void shouldFailToWaitForRestartThatNeverHappens() throws Exception {
          waiters = Executors.newSingleThreadExecutor();
  
          latch = counter.expectedRestarts(1);
          Future<Boolean> future = asyncAwait(100, TimeUnit.MILLISECONDS);
  
          clock.sleep(1000);
          // Record a stop but NOT a start
          counter.recordStop();
          assertFalse(future.get(200, TimeUnit.MILLISECONDS));
          assertTrue(future.isDone());
      }
  
      private Future<Boolean> asyncAwait(long duration, TimeUnit unit) {
          return waiters.submit(() -> {
              try {
                  return latch.await(duration, unit);
              } catch (InterruptedException e) {
                  Thread.interrupted();
                  return false;
              }
          });
      }
  }
  