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.deferred;
  
  import org.apache.kafka.common.utils.LogContext;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.OptionalLong;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutionException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Timeout(value = 40)
  public class DeferredEventQueueTest {
  
      static class SampleDeferredEvent implements DeferredEvent {
          private final CompletableFuture<Void> future = new CompletableFuture<>();
  
          @Override
          public void complete(Throwable exception) {
              if (exception != null) {
                  future.completeExceptionally(exception);
              } else {
                  future.complete(null);
              }
          }
      }
  
      @Test
      public void testCompleteEvents() {
          DeferredEventQueue deferredEventQueue = new DeferredEventQueue(new LogContext());
          SampleDeferredEvent event1 = new SampleDeferredEvent();
          SampleDeferredEvent event2 = new SampleDeferredEvent();
          SampleDeferredEvent event3 = new SampleDeferredEvent();
          deferredEventQueue.add(1, event1);
          assertEquals(OptionalLong.of(1L), deferredEventQueue.highestPendingOffset());
          deferredEventQueue.add(1, event2);
          assertEquals(OptionalLong.of(1L), deferredEventQueue.highestPendingOffset());
          deferredEventQueue.add(3, event3);
          assertEquals(OptionalLong.of(3L), deferredEventQueue.highestPendingOffset());
          deferredEventQueue.completeUpTo(2);
          assertTrue(event1.future.isDone());
          assertTrue(event2.future.isDone());
          assertFalse(event3.future.isDone());
          deferredEventQueue.completeUpTo(4);
          assertTrue(event3.future.isDone());
          assertEquals(OptionalLong.empty(), deferredEventQueue.highestPendingOffset());
      }
  
      @Test
      public void testFailOnIncorrectOrdering() {
          DeferredEventQueue deferredEventQueue = new DeferredEventQueue(new LogContext());
          SampleDeferredEvent event1 = new SampleDeferredEvent();
          SampleDeferredEvent event2 = new SampleDeferredEvent();
          deferredEventQueue.add(2, event1);
          assertThrows(RuntimeException.class, () -> deferredEventQueue.add(1, event2));
      }
  
      @Test
      public void testFailEvents() {
          DeferredEventQueue deferredEventQueue = new DeferredEventQueue(new LogContext());
          SampleDeferredEvent event1 = new SampleDeferredEvent();
          SampleDeferredEvent event2 = new SampleDeferredEvent();
          SampleDeferredEvent event3 = new SampleDeferredEvent();
          deferredEventQueue.add(1, event1);
          deferredEventQueue.add(3, event2);
          deferredEventQueue.add(3, event3);
          deferredEventQueue.completeUpTo(2);
          assertTrue(event1.future.isDone());
          assertFalse(event2.future.isDone());
          assertFalse(event3.future.isDone());
          deferredEventQueue.failAll(new RuntimeException("failed"));
          assertTrue(event2.future.isDone());
          assertTrue(event3.future.isDone());
          assertEquals(RuntimeException.class, assertThrows(ExecutionException.class,
              () -> event2.future.get()).getCause().getClass());
          assertEquals(RuntimeException.class, assertThrows(ExecutionException.class,
              () -> event3.future.get()).getCause().getClass());
      }
  }
  