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.common.requests;
  
  import org.apache.kafka.common.errors.UnsupportedVersionException;
  import org.apache.kafka.common.message.LeaveGroupResponseData;
  import org.apache.kafka.common.message.LeaveGroupResponseData.MemberResponse;
  import org.apache.kafka.common.protocol.ApiKeys;
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.protocol.MessageUtil;
  import org.apache.kafka.common.protocol.Readable;
  import org.apache.kafka.common.utils.annotation.ApiKeyVersionsSource;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.EnumMap;
  import java.util.List;
  import java.util.Map;
  
  import static org.apache.kafka.common.requests.AbstractResponse.DEFAULT_THROTTLE_TIME;
  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;
  
  public class LeaveGroupResponseTest {
  
      private final int throttleTimeMs = 10;
  
      private List<MemberResponse> memberResponses;
  
      @BeforeEach
      public void setUp() {
          memberResponses = Arrays.asList(new MemberResponse()
                                              .setMemberId("member_1")
                                              .setGroupInstanceId("instance_1")
                                              .setErrorCode(Errors.UNKNOWN_MEMBER_ID.code()),
                                          new MemberResponse()
                                              .setMemberId("member_2")
                                              .setGroupInstanceId("instance_2")
                                              .setErrorCode(Errors.FENCED_INSTANCE_ID.code())
          );
      }
  
      @Test
      public void testConstructorWithMemberResponses() {
          Map<Errors, Integer> expectedErrorCounts = new EnumMap<>(Errors.class);
          expectedErrorCounts.put(Errors.NONE, 1); // top level
          expectedErrorCounts.put(Errors.UNKNOWN_MEMBER_ID, 1);
          expectedErrorCounts.put(Errors.FENCED_INSTANCE_ID, 1);
  
          for (short version : ApiKeys.LEAVE_GROUP.allVersions()) {
              LeaveGroupResponse leaveGroupResponse = new LeaveGroupResponse(memberResponses,
                                                                             Errors.NONE,
                                                                             throttleTimeMs,
                                                                             version);
  
              if (version >= 3) {
                  assertEquals(expectedErrorCounts, leaveGroupResponse.errorCounts());
                  assertEquals(memberResponses, leaveGroupResponse.memberResponses());
              } else {
                  assertEquals(Collections.singletonMap(Errors.UNKNOWN_MEMBER_ID, 1),
                               leaveGroupResponse.errorCounts());
                  assertEquals(Collections.emptyList(), leaveGroupResponse.memberResponses());
              }
  
              if (version >= 1) {
                  assertEquals(throttleTimeMs, leaveGroupResponse.throttleTimeMs());
              } else {
                  assertEquals(DEFAULT_THROTTLE_TIME, leaveGroupResponse.throttleTimeMs());
              }
  
              assertEquals(Errors.UNKNOWN_MEMBER_ID, leaveGroupResponse.error());
          }
      }
  
      @Test
      public void testShouldThrottle() {
          LeaveGroupResponse response = new LeaveGroupResponse(new LeaveGroupResponseData());
          for (short version : ApiKeys.LEAVE_GROUP.allVersions()) {
              if (version >= 2) {
                  assertTrue(response.shouldClientThrottle(version));
              } else {
                  assertFalse(response.shouldClientThrottle(version));
              }
          }
      }
  
      @Test
      public void testEqualityWithSerialization() {
          LeaveGroupResponseData responseData = new LeaveGroupResponseData()
                  .setErrorCode(Errors.NONE.code())
                  .setThrottleTimeMs(throttleTimeMs);
          for (short version : ApiKeys.LEAVE_GROUP.allVersions()) {
              LeaveGroupResponse primaryResponse = LeaveGroupResponse.parse(
                  MessageUtil.toByteBufferAccessor(responseData, version), version);
              LeaveGroupResponse secondaryResponse = LeaveGroupResponse.parse(
                  MessageUtil.toByteBufferAccessor(responseData, version), version);
  
              assertEquals(primaryResponse, primaryResponse);
              assertEquals(primaryResponse, secondaryResponse);
              assertEquals(primaryResponse.hashCode(), secondaryResponse.hashCode());
          }
      }
  
      @Test
      public void testParse() {
          Map<Errors, Integer> expectedErrorCounts = Collections.singletonMap(Errors.NOT_COORDINATOR, 1);
  
          LeaveGroupResponseData data = new LeaveGroupResponseData()
              .setErrorCode(Errors.NOT_COORDINATOR.code())
              .setThrottleTimeMs(throttleTimeMs);
  
          for (short version : ApiKeys.LEAVE_GROUP.allVersions()) {
              Readable buffer = MessageUtil.toByteBufferAccessor(data, version);
              LeaveGroupResponse leaveGroupResponse = LeaveGroupResponse.parse(buffer, version);
              assertEquals(expectedErrorCounts, leaveGroupResponse.errorCounts());
  
              if (version >= 1) {
                  assertEquals(throttleTimeMs, leaveGroupResponse.throttleTimeMs());
              } else {
                  assertEquals(DEFAULT_THROTTLE_TIME, leaveGroupResponse.throttleTimeMs());
              }
  
              assertEquals(Errors.NOT_COORDINATOR, leaveGroupResponse.error());
          }
      }
  
      @Test
      public void testEqualityWithMemberResponses() {
          for (short version : ApiKeys.LEAVE_GROUP.allVersions()) {
              List<MemberResponse> localResponses = version > 2 ? memberResponses : memberResponses.subList(0, 1);
              LeaveGroupResponse primaryResponse = new LeaveGroupResponse(localResponses,
                                                                          Errors.NONE,
                                                                          throttleTimeMs,
                                                                          version);
  
              // The order of members should not alter result data.
              Collections.reverse(localResponses);
              LeaveGroupResponse reversedResponse = new LeaveGroupResponse(localResponses,
                                                                           Errors.NONE,
                                                                           throttleTimeMs,
                                                                           version);
  
              assertEquals(primaryResponse, primaryResponse);
              assertEquals(primaryResponse, reversedResponse);
              assertEquals(primaryResponse.hashCode(), reversedResponse.hashCode());
          }
      }
  
      @ParameterizedTest
      @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
      public void testNoErrorNoMembersResponses(short version) {
          LeaveGroupResponseData data = new LeaveGroupResponseData()
              .setErrorCode(Errors.NONE.code())
              .setMembers(Collections.emptyList());
  
          if (version < 3) {
              assertThrows(UnsupportedVersionException.class,
                  () -> new LeaveGroupResponse(data, version));
          } else {
              LeaveGroupResponse response = new LeaveGroupResponse(data, version);
              assertEquals(Errors.NONE, response.topLevelError());
              assertEquals(Collections.emptyList(), response.memberResponses());
          }
      }
  
      @ParameterizedTest
      @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
      public void testNoErrorMultipleMembersResponses(short version) {
          LeaveGroupResponseData data = new LeaveGroupResponseData()
              .setErrorCode(Errors.NONE.code())
              .setMembers(memberResponses);
  
          if (version < 3) {
              assertThrows(UnsupportedVersionException.class,
                  () -> new LeaveGroupResponse(data, version));
          } else {
              LeaveGroupResponse response = new LeaveGroupResponse(data, version);
              assertEquals(Errors.NONE, response.topLevelError());
              assertEquals(memberResponses, response.memberResponses());
          }
      }
      
      @ParameterizedTest
      @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
      public void testErrorResponses(short version) {
          LeaveGroupResponseData dataNoMembers = new LeaveGroupResponseData()
              .setErrorCode(Errors.GROUP_ID_NOT_FOUND.code())
              .setMembers(Collections.emptyList());
  
          LeaveGroupResponse responseNoMembers = new LeaveGroupResponse(dataNoMembers, version);
          assertEquals(Errors.GROUP_ID_NOT_FOUND, responseNoMembers.topLevelError());
          
          LeaveGroupResponseData dataMembers = new LeaveGroupResponseData()
              .setErrorCode(Errors.GROUP_ID_NOT_FOUND.code())
              .setMembers(memberResponses);
          
          LeaveGroupResponse responseMembers = new LeaveGroupResponse(dataMembers, version);
          assertEquals(Errors.GROUP_ID_NOT_FOUND, responseMembers.topLevelError());
      }
  
  }
  