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.clients.consumer.internals;
  
  import org.apache.kafka.common.utils.LogContext;
  import org.apache.kafka.common.utils.MockTime;
  import org.apache.kafka.common.utils.Time;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class HeartbeatRequestStateTest {
  
      private static final LogContext LOG_CONTEXT = new LogContext("test ");
      private static final long HEARTBEAT_INTERVAL_MS = 1000;
      private static final long RETRY_BACKOFF_MS = 100;
      private static final long RETRY_BACKOFF_MAX_MS = 500;
      private static final double JITTER = 0.2;
  
      private final Time time = new MockTime();
  
      @Test
      public void testCanSendRequestAndTimeToNextHeartbeatMs() {
          final HeartbeatRequestState heartbeatRequestState = new HeartbeatRequestState(
              LOG_CONTEXT,
              time,
              HEARTBEAT_INTERVAL_MS,
              RETRY_BACKOFF_MS,
              RETRY_BACKOFF_MAX_MS,
              JITTER
          );
  
          assertFalse(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(HEARTBEAT_INTERVAL_MS, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
          time.sleep(HEARTBEAT_INTERVAL_MS - 1);
          assertFalse(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(1, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
          time.sleep(1);
          assertTrue(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(0, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
          time.sleep(100);
          assertTrue(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(0, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
      }
  
      @Test
      public void testResetTimer() {
          final HeartbeatRequestState heartbeatRequestState = new HeartbeatRequestState(
              LOG_CONTEXT,
              time,
              HEARTBEAT_INTERVAL_MS,
              RETRY_BACKOFF_MS,
              RETRY_BACKOFF_MAX_MS,
              JITTER
          );
          time.sleep(HEARTBEAT_INTERVAL_MS + 100);
          assertTrue(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(0, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
  
          heartbeatRequestState.resetTimer();
  
          assertFalse(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(HEARTBEAT_INTERVAL_MS, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
      }
  
      @Test
      public void testUpdateHeartbeatIntervalMs() {
          final HeartbeatRequestState heartbeatRequestState = new HeartbeatRequestState(
              LOG_CONTEXT,
              time,
              HEARTBEAT_INTERVAL_MS,
              RETRY_BACKOFF_MS,
              RETRY_BACKOFF_MAX_MS,
              JITTER
          );
          final long updatedHeartbeatIntervalMs = 2 * HEARTBEAT_INTERVAL_MS;
          time.sleep(HEARTBEAT_INTERVAL_MS + 100);
  
          heartbeatRequestState.updateHeartbeatIntervalMs(updatedHeartbeatIntervalMs);
  
          assertFalse(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertEquals(2 * HEARTBEAT_INTERVAL_MS, heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()));
      }
  
      @Test
      public void testUpdateHeartbeatIntervalMsWithSameInterval() {
          final HeartbeatRequestState heartbeatRequestState = new HeartbeatRequestState(
              LOG_CONTEXT,
              time,
              HEARTBEAT_INTERVAL_MS,
              RETRY_BACKOFF_MS,
              RETRY_BACKOFF_MAX_MS,
              JITTER
          );
          time.sleep(HEARTBEAT_INTERVAL_MS + 100);
  
          heartbeatRequestState.updateHeartbeatIntervalMs(HEARTBEAT_INTERVAL_MS);
  
          assertEquals(HEARTBEAT_INTERVAL_MS, heartbeatRequestState.heartbeatIntervalMs());
          assertTrue(heartbeatRequestState.canSendRequest(time.milliseconds()));
      }
  
      @Test
      public void testOnFailedAttempt() {
          final HeartbeatRequestState heartbeatRequestState = new HeartbeatRequestState(
              LOG_CONTEXT,
              time,
              HEARTBEAT_INTERVAL_MS,
              RETRY_BACKOFF_MS,
              RETRY_BACKOFF_MAX_MS,
              JITTER
          );
          time.sleep(HEARTBEAT_INTERVAL_MS + 100);
  
          heartbeatRequestState.onFailedAttempt(time.milliseconds());
  
          assertFalse(heartbeatRequestState.canSendRequest(time.milliseconds()));
          assertTrue(heartbeatRequestState.timeToNextHeartbeatMs(time.milliseconds()) > 0);
      }
  }