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.metalog;
  
  import org.apache.kafka.common.metadata.RegisterBrokerRecord;
  import org.apache.kafka.raft.LeaderAndEpoch;
  import org.apache.kafka.server.common.ApiMessageAndVersion;
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.List;
  import java.util.OptionalInt;
  
  import static org.apache.kafka.metalog.MockMetaLogManagerListener.COMMIT;
  import static org.apache.kafka.metalog.MockMetaLogManagerListener.LAST_COMMITTED_OFFSET;
  import static org.apache.kafka.metalog.MockMetaLogManagerListener.SHUTDOWN;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  
  @Timeout(value = 40)
  public class LocalLogManagerTest {
  
      /**
       * Test creating a LocalLogManager and closing it.
       */
      @Test
      public void testCreateAndClose() throws Exception {
          try (
              LocalLogManagerTestEnv env = new LocalLogManagerTestEnv.Builder(1).
                  buildWithMockListeners()
          ) {
              env.close();
              assertNull(env.firstError.get());
          }
      }
  
      /**
       * Test that the local log manager will claim leadership.
       */
      @Test
      public void testClaimsLeadership() throws Exception {
          try (
              LocalLogManagerTestEnv env = new LocalLogManagerTestEnv.Builder(1).
                      buildWithMockListeners()
          ) {
              assertEquals(new LeaderAndEpoch(OptionalInt.of(0), 1), env.waitForLeader());
              env.close();
              assertNull(env.firstError.get());
          }
      }
  
      /**
       * Test that we can pass leadership back and forth between log managers.
       */
      @Test
      public void testPassLeadership() throws Exception {
          try (
              LocalLogManagerTestEnv env = new LocalLogManagerTestEnv.Builder(3).
                      buildWithMockListeners()
          ) {
              LeaderAndEpoch first = env.waitForLeader();
              LeaderAndEpoch cur = first;
              do {
                  int currentLeaderId = cur.leaderId().orElseThrow(() ->
                      new AssertionError("Current leader is undefined")
                  );
                  env.logManagers().get(currentLeaderId).resign(cur.epoch());
  
                  LeaderAndEpoch next = env.waitForLeader();
                  while (next.epoch() == cur.epoch()) {
                      Thread.sleep(1);
                      next = env.waitForLeader();
                  }
                  long expectedNextEpoch = cur.epoch() + 2;
                  assertEquals(expectedNextEpoch, next.epoch(), "Expected next epoch to be " + expectedNextEpoch +
                      ", but found  " + next);
                  cur = next;
              } while (cur.leaderId().equals(first.leaderId()));
              env.close();
              assertNull(env.firstError.get());
          }
      }
  
      private static void waitForLastCommittedOffset(long targetOffset,
                  LocalLogManager logManager) throws InterruptedException {
          TestUtils.retryOnExceptionWithTimeout(20000, 3, () -> {
              MockMetaLogManagerListener listener =
                  (MockMetaLogManagerListener) logManager.listeners().get(0);
              long highestOffset = -1;
              for (String event : listener.serializedEvents()) {
                  if (event.startsWith(LAST_COMMITTED_OFFSET)) {
                      long offset = Long.parseLong(
                          event.substring(LAST_COMMITTED_OFFSET.length() + 1));
                      if (offset < highestOffset) {
                          throw new RuntimeException("Invalid offset: " + offset +
                              " is less than the previous offset of " + highestOffset);
                      }
                      highestOffset = offset;
                  }
              }
              if (highestOffset < targetOffset) {
                  throw new RuntimeException("Offset for log manager " +
                      logManager.nodeId() + " only reached " + highestOffset);
              }
          });
      }
  
      /**
       * Test that all the log managers see all the commits.
       */
      @Test
      public void testCommits() throws Exception {
          try (
              LocalLogManagerTestEnv env = new LocalLogManagerTestEnv.Builder(3).
                      buildWithMockListeners()
          ) {
              LeaderAndEpoch leaderInfo = env.waitForLeader();
              int leaderId = leaderInfo.leaderId().orElseThrow(() ->
                  new AssertionError("Current leader is undefined")
              );
  
              LocalLogManager activeLogManager = env.logManagers().get(leaderId);
              int epoch = activeLogManager.leaderAndEpoch().epoch();
              List<ApiMessageAndVersion> messages = List.of(
                  new ApiMessageAndVersion(new RegisterBrokerRecord().setBrokerId(0), (short) 0),
                  new ApiMessageAndVersion(new RegisterBrokerRecord().setBrokerId(1), (short) 0),
                  new ApiMessageAndVersion(new RegisterBrokerRecord().setBrokerId(2), (short) 0));
              assertEquals(3, activeLogManager.prepareAppend(epoch, messages));
              activeLogManager.schedulePreparedAppend();
              for (LocalLogManager logManager : env.logManagers()) {
                  waitForLastCommittedOffset(3, logManager);
              }
              List<MockMetaLogManagerListener> listeners = env.logManagers().stream().
                  map(m -> (MockMetaLogManagerListener) m.listeners().get(0)).
                  toList();
              env.close();
              for (MockMetaLogManagerListener listener : listeners) {
                  List<String> events = listener.serializedEvents();
                  assertEquals(SHUTDOWN, events.get(events.size() - 1));
                  int foundIndex = 0;
                  for (String event : events) {
                      if (event.startsWith(COMMIT)) {
                          assertEquals(messages.get(foundIndex).message().toString(),
                              event.substring(COMMIT.length() + 1));
                          foundIndex++;
                      }
                  }
                  assertEquals(messages.size(), foundIndex);
              }
          }
      }
  }
  