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.raft;
  
  import org.apache.kafka.common.utils.LogContext;
  import org.apache.kafka.common.utils.MockTime;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  import java.net.InetSocketAddress;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  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.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class ResignedStateTest {
  
      private final MockTime time = new MockTime();
      private final LogContext logContext = new LogContext();
      int electionTimeoutMs = 5000;
      int localId = 0;
      int epoch = 5;
      Endpoints localEndpoints = Endpoints.fromInetSocketAddresses(
          Map.of(
              VoterSetTest.DEFAULT_LISTENER_NAME,
              InetSocketAddress.createUnresolved("localhost", 1234)
          )
      );
  
      private ResignedState newResignedState(Set<Integer> voters) {
          return new ResignedState(
              time,
              localId,
              epoch,
              voters,
              electionTimeoutMs,
              List.of(),
              localEndpoints,
              logContext
          );
      }
  
      @Test
      public void testResignedState() {
          int remoteId = 1;
          Set<Integer> voters = Set.of(localId, remoteId);
  
          ResignedState state = newResignedState(voters);
  
          assertEquals(ElectionState.withElectedLeader(epoch, localId, Optional.empty(), voters), state.election());
          assertEquals(epoch, state.epoch());
  
          assertEquals(Set.of(remoteId), state.unackedVoters());
          state.acknowledgeResignation(remoteId);
          assertEquals(Set.of(), state.unackedVoters());
  
          assertEquals(electionTimeoutMs, state.remainingElectionTimeMs(time.milliseconds()));
          assertFalse(state.hasElectionTimeoutExpired(time.milliseconds()));
          time.sleep(electionTimeoutMs / 2);
          assertEquals(electionTimeoutMs / 2, state.remainingElectionTimeMs(time.milliseconds()));
          assertFalse(state.hasElectionTimeoutExpired(time.milliseconds()));
          time.sleep(electionTimeoutMs / 2);
          assertEquals(0, state.remainingElectionTimeMs(time.milliseconds()));
          assertTrue(state.hasElectionTimeoutExpired(time.milliseconds()));
      }
  
      @ParameterizedTest
      @ValueSource(booleans = {true, false})
      public void testGrantVote(boolean isLogUpToDate) {
          ResignedState state = newResignedState(Set.of(1, 2, 3));
  
          assertEquals(
              isLogUpToDate,
              state.canGrantVote(ReplicaKey.of(1, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, true)
          );
          assertEquals(
              isLogUpToDate,
              state.canGrantVote(ReplicaKey.of(2, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, true)
          );
          assertEquals(
              isLogUpToDate,
              state.canGrantVote(ReplicaKey.of(3, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, true)
          );
  
          assertFalse(state.canGrantVote(ReplicaKey.of(1, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, false));
          assertFalse(state.canGrantVote(ReplicaKey.of(2, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, false));
          assertFalse(state.canGrantVote(ReplicaKey.of(3, ReplicaKey.NO_DIRECTORY_ID), isLogUpToDate, false));
      }
  
      @Test
      void testNegativeScenarioAcknowledgeResignation() {
          Set<Integer> voters = Set.of(0, 1, 2, 3, 4, 5);
  
          ResignedState state = newResignedState(voters);
  
          assertEquals(ElectionState.withElectedLeader(epoch, 0, Optional.empty(), voters), state.election());
          assertEquals(epoch, state.epoch());
  
          // try non-existed voter must throw an exception
          assertThrows(IllegalArgumentException.class, () -> state.acknowledgeResignation(10));
      }
  
      @Test
      void testLeaderEndpoints() {
          ResignedState state = newResignedState(Set.of(1, 2, 3));
  
          assertEquals(localEndpoints, state.leaderEndpoints());
          assertNotEquals(Endpoints.empty(), state.leaderEndpoints());
      }
  }
  