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.server.util.timer;
  
  import org.apache.kafka.common.utils.MockTime;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.stream.Collectors;
  import java.util.stream.IntStream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class TimerTaskListTest {
  
      private static class TestTask extends TimerTask {
          TestTask(long delayMs) {
              super(delayMs);
          }
  
          @Override
          public void run() { }
      }
  
      private static int size(TimerTaskList list) {
          AtomicInteger count = new AtomicInteger(0);
          list.foreach(__ -> count.incrementAndGet());
          return count.get();
      }
  
      @Test
      public void testAll() {
          AtomicInteger sharedCounter = new AtomicInteger(0);
          TimerTaskList list1 = new TimerTaskList(sharedCounter);
          TimerTaskList list2 = new TimerTaskList(sharedCounter);
          TimerTaskList list3 = new TimerTaskList(sharedCounter);
  
          List<TimerTask> tasks = IntStream.rangeClosed(1, 10).mapToObj(i -> {
              TestTask task = new TestTask(0L);
              list1.add(new TimerTaskEntry(task, 10L));
              assertEquals(i, sharedCounter.get());
              return task;
          }).collect(Collectors.toList());
  
          assertEquals(tasks.size(), sharedCounter.get());
  
          // reinserting the existing tasks shouldn't change the task count
          tasks.stream().limit(4).forEach(task -> {
              int prevCounter = sharedCounter.get();
              // new TimerTaskEntry(task) will remove the existing entry from the list
              list2.add(new TimerTaskEntry(task, 10L));
              assertEquals(prevCounter, sharedCounter.get());
          });
          assertEquals(10 - 4, size(list1));
          assertEquals(4, size(list2));
  
          assertEquals(tasks.size(), sharedCounter.get());
  
          // reinserting the existing tasks shouldn't change the task count
          tasks.stream().skip(4).forEach(task -> {
              int prevCounter = sharedCounter.get();
              // new TimerTaskEntry(task) will remove the existing entry from the list
              list3.add(new TimerTaskEntry(task, 10L));
              assertEquals(prevCounter, sharedCounter.get());
          });
          assertEquals(0, size(list1));
          assertEquals(4, size(list2));
          assertEquals(6, size(list3));
  
          assertEquals(tasks.size(), sharedCounter.get());
  
          // cancel tasks in lists
          list1.foreach(TimerTask::cancel);
          assertEquals(0, size(list1));
          assertEquals(4, size(list2));
          assertEquals(6, size(list3));
  
          list2.foreach(TimerTask::cancel);
          assertEquals(0, size(list1));
          assertEquals(0, size(list2));
          assertEquals(6, size(list3));
  
          list3.foreach(TimerTask::cancel);
          assertEquals(0, size(list1));
          assertEquals(0, size(list2));
          assertEquals(0, size(list3));
      }
  
      @Test
      public void testGetDelay() {
          MockTime time = new MockTime();
          TimerTaskList list = new TimerTaskList(new AtomicInteger(0), time);
          list.setExpiration(time.hiResClockMs() + 10000L);
          time.sleep(5000L);
          assertEquals(5L, list.getDelay(TimeUnit.SECONDS));
      }
  }
  