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.controller;
  
  import org.apache.kafka.common.utils.MockTime;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.HashSet;
  import java.util.Optional;
  import java.util.OptionalLong;
  import java.util.Set;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Timeout(40)
  public class BrokerHeartbeatTrackerTest {
      private static BrokerHeartbeatTracker newBrokerHeartbeatTracker() {
          MockTime time = new MockTime(0, 1_000_000, 0);
          return new BrokerHeartbeatTracker(time, 10_000_000);
      }
  
      private static final Set<BrokerIdAndEpoch> TEST_BROKERS = Set.of(
          new BrokerIdAndEpoch(0, 0L),
          new BrokerIdAndEpoch(1, 100L),
          new BrokerIdAndEpoch(2, 200L)
      );
  
      @Test
      public void testUpdateContactTime() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertEquals(OptionalLong.empty(), tracker.contactTime(new BrokerIdAndEpoch(1, 100L)));
          tracker.updateContactTime(new BrokerIdAndEpoch(1, 100L));
          assertEquals(OptionalLong.of(0L), tracker.contactTime(new BrokerIdAndEpoch(1, 100L)));
      }
  
      @Test
      public void testMaybeRemoveExpiredWithEmptyTracker() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertEquals(Optional.empty(), tracker.maybeRemoveExpired());
      }
  
      @Test
      public void testMaybeRemoveExpiredWithAllUpToDate() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          TEST_BROKERS.forEach(tracker::updateContactTime);
          assertEquals(Optional.empty(), tracker.maybeRemoveExpired());
      }
  
      @Test
      public void testMaybeRemoveExpiredWithAllExpired() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          TEST_BROKERS.forEach(tracker::updateContactTime);
          tracker.time().sleep(11);
          Set<BrokerIdAndEpoch> expired = new HashSet<>();
          Optional<BrokerIdAndEpoch> idAndEpoch;
          do {
              idAndEpoch = tracker.maybeRemoveExpired();
              idAndEpoch.ifPresent(expired::add);
          } while (idAndEpoch.isPresent());
          assertEquals(TEST_BROKERS, expired);
      }
  
      @Test
      public void testHasValidSessionIsTrueForKnownBroker() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          TEST_BROKERS.forEach(tracker::updateContactTime);
          assertTrue(tracker.hasValidSession(new BrokerIdAndEpoch(2, 200L)));
      }
  
      @Test
      public void testHasValidSessionIsFalseForUnknownBroker() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          TEST_BROKERS.forEach(tracker::updateContactTime);
          assertFalse(tracker.hasValidSession(new BrokerIdAndEpoch(3, 300L)));
      }
  
      @Test
      public void testHasValidSessionIsFalseForUnknownBrokerEpoch() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          TEST_BROKERS.forEach(tracker::updateContactTime);
          assertFalse(tracker.hasValidSession(new BrokerIdAndEpoch(2, 100L)));
      }
  
      @Test
      public void testIsExpiredIsFalseForTheCurrentTime() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertFalse(tracker.isExpired(456, 456));
      }
  
      @Test
      public void testIsExpiredIsFalseForTenNanosecondsAfter() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertFalse(tracker.isExpired(456, 466));
      }
  
      @Test
      public void testIsExpiredIsTrueAfterExpirationTime() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertTrue(tracker.isExpired(456, 456 + 10_000_001));
      }
  
      @Test
      public void testIsExpiredIsFalseForPreviousTime() {
          BrokerHeartbeatTracker tracker = newBrokerHeartbeatTracker();
          assertFalse(tracker.isExpired(456, 0));
      }
  }
  