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.server.share.persister;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.requests.DeleteShareGroupStateResponse;
  import org.apache.kafka.common.requests.InitializeShareGroupStateResponse;
  import org.apache.kafka.common.requests.ReadShareGroupStateResponse;
  import org.apache.kafka.common.requests.ReadShareGroupStateSummaryResponse;
  import org.apache.kafka.common.requests.WriteShareGroupStateResponse;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.CompletableFuture;
  
  /**
   * The default implementation of the {@link Persister} interface which is used by the
   * group coordinator and share-partition leaders to manage the durable share-partition state.
   * This implementation uses inter-broker RPCs to make requests to the share coordinator
   * which is responsible for persisting the share-partition state.
   */
  public class DefaultStatePersister implements Persister {
      private final PersisterStateManager stateManager;
  
      private static final Logger log = LoggerFactory.getLogger(DefaultStatePersister.class);
  
      public DefaultStatePersister(PersisterStateManager stateManager) {
          this.stateManager = stateManager;
          this.stateManager.start();
      }
  
      @Override
      public void stop() {
          try {
              if (stateManager != null) {
                  stateManager.stop();
              }
          } catch (Exception e) {
              log.error("Unable to stop state manager", e);
          }
      }
  
      /**
       * Used by the group coordinator to initialize the share-partition state.
       * This is an inter-broker RPC authorized as a cluster action.
       *
       * @param request InitializeShareGroupStateParameters
       * @return A completable future of InitializeShareGroupStateResult
       */
      public CompletableFuture<InitializeShareGroupStateResult> initializeState(InitializeShareGroupStateParameters request) {
          try {
              validate(request);
          } catch (Exception e) {
              log.error("Unable to validate initialize state request", e);
              return CompletableFuture.failedFuture(e);
          }
          GroupTopicPartitionData<PartitionStateData> gtp = request.groupTopicPartitionData();
          String groupId = gtp.groupId();
  
          Map<Uuid, Map<Integer, CompletableFuture<InitializeShareGroupStateResponse>>> futureMap = new HashMap<>();
          List<PersisterStateManager.InitializeStateHandler> handlers = new ArrayList<>();
  
          gtp.topicsData().forEach(topicData -> {
              topicData.partitions().forEach(partitionData -> {
                  CompletableFuture<InitializeShareGroupStateResponse> future = futureMap
                      .computeIfAbsent(topicData.topicId(), k -> new HashMap<>())
                      .computeIfAbsent(partitionData.partition(), k -> new CompletableFuture<>());
  
                  handlers.add(
                      stateManager.new InitializeStateHandler(
                          groupId,
                          topicData.topicId(),
                          partitionData.partition(),
                          partitionData.stateEpoch(),
                          partitionData.startOffset(),
                          future,
                          null
                      )
                  );
              });
          });
  
          for (PersisterStateManager.PersisterStateManagerHandler handler : handlers) {
              stateManager.enqueue(handler);
          }
  
          CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(
              handlers.stream()
                  .map(PersisterStateManager.InitializeStateHandler::result)
                  .toArray(CompletableFuture[]::new));
  
          return combinedFuture.thenApply(v -> initializeResponsesToResult(futureMap));
      }
  
      /**
       * Used by share-partition leaders to write share-partition state to a share coordinator.
       * This is an inter-broker RPC authorized as a cluster action.
       *
       * @param request WriteShareGroupStateParameters
       * @return A completable future of WriteShareGroupStateResult
       */
      public CompletableFuture<WriteShareGroupStateResult> writeState(WriteShareGroupStateParameters request) {
          try {
              validate(request);
          } catch (Exception e) {
              log.error("Unable to validate write state request", e);
              return CompletableFuture.failedFuture(e);
          }
          GroupTopicPartitionData<PartitionStateBatchData> gtp = request.groupTopicPartitionData();
          String groupId = gtp.groupId();
  
          Map<Uuid, Map<Integer, CompletableFuture<WriteShareGroupStateResponse>>> futureMap = new HashMap<>();
          List<PersisterStateManager.WriteStateHandler> handlers = new ArrayList<>();
  
          gtp.topicsData().forEach(topicData -> {
              topicData.partitions().forEach(partitionData -> {
                  CompletableFuture<WriteShareGroupStateResponse> future = futureMap
                      .computeIfAbsent(topicData.topicId(), k -> new HashMap<>())
                      .computeIfAbsent(partitionData.partition(), k -> new CompletableFuture<>());
  
                  handlers.add(
                      stateManager.new WriteStateHandler(
                          groupId,
                          topicData.topicId(),
                          partitionData.partition(),
                          partitionData.stateEpoch(),
                          partitionData.leaderEpoch(),
                          partitionData.startOffset(),
                          partitionData.stateBatches(),
                          future, null)
                  );
              });
          });
  
          for (PersisterStateManager.PersisterStateManagerHandler handler : handlers) {
              stateManager.enqueue(handler);
          }
  
          CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(
              handlers.stream()
                  .map(PersisterStateManager.WriteStateHandler::result)
                  .toArray(CompletableFuture[]::new));
  
          return combinedFuture.thenApply(v -> writeResponsesToResult(futureMap));
      }
  
      /**
       * Takes in a list of COMPLETED futures and combines the results,
       * taking care of errors if any, into a single InitializeShareGroupStateResult
       *
       * @param futureMap - HashMap of {topic -> {partition -> future}}
       * @return Object representing combined result of type InitializeShareGroupStateResult
       */
      // visible for testing
      InitializeShareGroupStateResult initializeResponsesToResult(
          Map<Uuid, Map<Integer, CompletableFuture<InitializeShareGroupStateResponse>>> futureMap
      ) {
          List<TopicData<PartitionErrorData>> topicsData = futureMap.keySet().stream()
              .map(topicId -> {
                  List<PartitionErrorData> partitionErrData = futureMap.get(topicId).entrySet().stream()
                      .map(partitionFuture -> {
                          int partition = partitionFuture.getKey();
                          CompletableFuture<InitializeShareGroupStateResponse> future = partitionFuture.getValue();
                          try {
                              // already completed because of allOf application in the caller
                              InitializeShareGroupStateResponse partitionResponse = future.join();
                              return partitionResponse.data().results().get(0).partitions().stream()
                                  .map(partitionResult -> PartitionFactory.newPartitionErrorData(
                                      partitionResult.partition(),
                                      partitionResult.errorCode(),
                                      partitionResult.errorMessage()))
                                  .toList();
                          } catch (Exception e) {
                              log.error("Unexpected exception while initializing data in share coordinator", e);
                              return List.of(PartitionFactory.newPartitionErrorData(
                                  partition,
                                  Errors.UNKNOWN_SERVER_ERROR.code(),   // No specific public error code exists for InterruptedException / ExecutionException
                                  "Error initializing state in share coordinator: " + e.getMessage())
                              );
                          }
                      })
                      .flatMap(List::stream)
                      .toList();
                  return new TopicData<>(topicId, partitionErrData);
              })
              .toList();
          return new InitializeShareGroupStateResult.Builder()
              .setTopicsData(topicsData)
              .build();
      }
  
      /**
       * Takes in a list of COMPLETED futures and combines the results,
       * taking care of errors if any, into a single WriteShareGroupStateResult
       *
       * @param futureMap - HashMap of {topic -> {partition -> future}}
       * @return Object representing combined result of type WriteShareGroupStateResult
       */
      // visible for testing
      WriteShareGroupStateResult writeResponsesToResult(
          Map<Uuid, Map<Integer, CompletableFuture<WriteShareGroupStateResponse>>> futureMap
      ) {
          List<TopicData<PartitionErrorData>> topicsData = futureMap.keySet().stream()
              .map(topicId -> {
                  List<PartitionErrorData> partitionErrData = futureMap.get(topicId).entrySet().stream()
                      .map(partitionFuture -> {
                          int partition = partitionFuture.getKey();
                          CompletableFuture<WriteShareGroupStateResponse> future = partitionFuture.getValue();
                          try {
                              // already completed because of allOf application in the caller
                              WriteShareGroupStateResponse partitionResponse = future.join();
                              return partitionResponse.data().results().get(0).partitions().stream()
                                  .map(partitionResult -> PartitionFactory.newPartitionErrorData(
                                      partitionResult.partition(),
                                      partitionResult.errorCode(),
                                      partitionResult.errorMessage()))
                                  .toList();
                          } catch (Exception e) {
                              log.error("Unexpected exception while writing data to share coordinator", e);
                              return List.of(PartitionFactory.newPartitionErrorData(
                                  partition,
                                  Errors.UNKNOWN_SERVER_ERROR.code(),   // No specific public error code exists for InterruptedException / ExecutionException
                                  "Error writing state to share coordinator: " + e.getMessage())
                              );
                          }
                      })
                      .flatMap(List::stream)
                      .toList();
                  return new TopicData<>(topicId, partitionErrData);
              })
              .toList();
          return new WriteShareGroupStateResult.Builder()
              .setTopicsData(topicsData)
              .build();
      }
  
      /**
       * Used by share-partition leaders to read share-partition state from a share coordinator.
       * This is an inter-broker RPC authorized as a cluster action.
       *
       * @param request ReadShareGroupStateParameters
       * @return A completable future of ReadShareGroupStateResult
       */
      public CompletableFuture<ReadShareGroupStateResult> readState(ReadShareGroupStateParameters request) {
          try {
              validate(request);
          } catch (Exception e) {
              log.error("Unable to validate read state request", e);
              return CompletableFuture.failedFuture(e);
          }
          GroupTopicPartitionData<PartitionIdLeaderEpochData> gtp = request.groupTopicPartitionData();
          String groupId = gtp.groupId();
          Map<Uuid, Map<Integer, CompletableFuture<ReadShareGroupStateResponse>>> futureMap = new HashMap<>();
          List<PersisterStateManager.ReadStateHandler> handlers = new ArrayList<>();
  
          gtp.topicsData().forEach(topicData -> {
              topicData.partitions().forEach(partitionData -> {
                  CompletableFuture<ReadShareGroupStateResponse> future = futureMap
                      .computeIfAbsent(topicData.topicId(), k -> new HashMap<>())
                      .computeIfAbsent(partitionData.partition(), k -> new CompletableFuture<>());
  
                  handlers.add(
                      stateManager.new ReadStateHandler(
                          groupId,
                          topicData.topicId(),
                          partitionData.partition(),
                          partitionData.leaderEpoch(),
                          future,
                          null)
                  );
              });
          });
  
          for (PersisterStateManager.PersisterStateManagerHandler handler : handlers) {
              stateManager.enqueue(handler);
          }
  
          // Combine all futures into a single CompletableFuture<Void>
          CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(
              handlers.stream()
                  .map(PersisterStateManager.ReadStateHandler::result)
                  .toArray(CompletableFuture[]::new));
  
          // Transform the combined CompletableFuture<Void> into CompletableFuture<ReadShareGroupStateResult>
          return combinedFuture.thenApply(v -> readResponsesToResult(futureMap));
      }
  
      /**
       * Takes in a list of COMPLETED futures and combines the results,
       * taking care of errors if any, into a single ReadShareGroupStateResult
       *
       * @param futureMap - HashMap of {topic -> {partition -> future}}
       * @return Object representing combined result of type ReadShareGroupStateResult
       */
      // visible for testing
      ReadShareGroupStateResult readResponsesToResult(
          Map<Uuid, Map<Integer, CompletableFuture<ReadShareGroupStateResponse>>> futureMap
      ) {
          List<TopicData<PartitionAllData>> topicsData = futureMap.keySet().stream()
              .map(topicId -> {
                  List<PartitionAllData> partitionAllData = futureMap.get(topicId).entrySet().stream()
                      .map(partitionFuture -> {
                          int partition = partitionFuture.getKey();
                          CompletableFuture<ReadShareGroupStateResponse> future = partitionFuture.getValue();
                          try {
                              // already completed because of allOf call in the caller
                              ReadShareGroupStateResponse partitionResponse = future.join();
                              return partitionResponse.data().results().get(0).partitions().stream()
                                  .map(partitionResult -> PartitionFactory.newPartitionAllData(
                                      partitionResult.partition(),
                                      partitionResult.stateEpoch(),
                                      partitionResult.startOffset(),
                                      partitionResult.errorCode(),
                                      partitionResult.errorMessage(),
                                      partitionResult.stateBatches().stream().map(PersisterStateBatch::from).toList()
                                  ))
                                  .toList();
                          } catch (Exception e) {
                              log.error("Unexpected exception while getting data from share coordinator", e);
                              return List.of(PartitionFactory.newPartitionAllData(
                                  partition,
                                  -1,
                                  -1,
                                  Errors.UNKNOWN_SERVER_ERROR.code(),   // No specific public error code exists for InterruptedException / ExecutionException
                                  "Error reading state from share coordinator: " + e.getMessage(),
                                  List.of())
                              );
                          }
                      })
                      .flatMap(List::stream)
                      .toList();
                  return new TopicData<>(topicId, partitionAllData);
              })
              .toList();
          return new ReadShareGroupStateResult.Builder()
              .setTopicsData(topicsData)
              .build();
      }
  
      /**
       * Used by the group coordinator to delete share-partition state from a share coordinator.
       * This is an inter-broker RPC authorized as a cluster action.
       *
       * @param request DeleteShareGroupStateParameters
       * @return A completable future of DeleteShareGroupStateResult
       */
      public CompletableFuture<DeleteShareGroupStateResult> deleteState(DeleteShareGroupStateParameters request) {
          try {
              validate(request);
          } catch (Exception e) {
              log.error("Unable to validate delete state request", e);
              return CompletableFuture.failedFuture(e);
          }
          GroupTopicPartitionData<PartitionIdData> gtp = request.groupTopicPartitionData();
          String groupId = gtp.groupId();
  
          Map<Uuid, Map<Integer, CompletableFuture<DeleteShareGroupStateResponse>>> futureMap = new HashMap<>();
          List<PersisterStateManager.DeleteStateHandler> handlers = new ArrayList<>();
  
          gtp.topicsData().forEach(topicData -> {
              topicData.partitions().forEach(partitionData -> {
                  CompletableFuture<DeleteShareGroupStateResponse> future = futureMap
                      .computeIfAbsent(topicData.topicId(), k -> new HashMap<>())
                      .computeIfAbsent(partitionData.partition(), k -> new CompletableFuture<>());
  
                  handlers.add(
                      stateManager.new DeleteStateHandler(
                          groupId,
                          topicData.topicId(),
                          partitionData.partition(),
                          future,
                          null
                      )
                  );
              });
          });
  
          for (PersisterStateManager.PersisterStateManagerHandler handler : handlers) {
              stateManager.enqueue(handler);
          }
  
          CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(
              handlers.stream()
                  .map(PersisterStateManager.DeleteStateHandler::result)
                  .toArray(CompletableFuture[]::new));
  
          return combinedFuture.thenApply(v -> deleteResponsesToResult(futureMap));
      }
  
      /**
       * Used by the group coordinator to read the offset information from share-partition state from a share coordinator.
       * This is an inter-broker RPC authorized as a cluster action.
       *
       * @param request ReadShareGroupStateSummaryParameters
       * @return A completable future of  ReadShareGroupStateSummaryResult
       */
      public CompletableFuture<ReadShareGroupStateSummaryResult> readSummary(ReadShareGroupStateSummaryParameters request) {
          try {
              validate(request);
          } catch (Exception e) {
              log.error("Unable to validate read state summary request", e);
              return CompletableFuture.failedFuture(e);
          }
  
          GroupTopicPartitionData<PartitionIdLeaderEpochData> gtp = request.groupTopicPartitionData();
          String groupId = gtp.groupId();
          Map<Uuid, Map<Integer, CompletableFuture<ReadShareGroupStateSummaryResponse>>> futureMap = new HashMap<>();
          List<PersisterStateManager.ReadStateSummaryHandler> handlers = new ArrayList<>();
  
          gtp.topicsData().forEach(topicData -> {
              topicData.partitions().forEach(partitionData -> {
                  CompletableFuture<ReadShareGroupStateSummaryResponse> future = futureMap
                      .computeIfAbsent(topicData.topicId(), k -> new HashMap<>())
                      .computeIfAbsent(partitionData.partition(), k -> new CompletableFuture<>());
  
                  handlers.add(
                      stateManager.new ReadStateSummaryHandler(
                          groupId,
                          topicData.topicId(),
                          partitionData.partition(),
                          partitionData.leaderEpoch(),
                          future,
                          null
                      )
                  );
              });
          });
  
          for (PersisterStateManager.PersisterStateManagerHandler handler : handlers) {
              stateManager.enqueue(handler);
          }
  
          // Combine all futures into a single CompletableFuture<Void>
          CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(
              handlers.stream()
                  .map(PersisterStateManager.ReadStateSummaryHandler::result)
                  .toArray(CompletableFuture[]::new));
  
          // Transform the combined CompletableFuture<Void> into CompletableFuture<ReadShareGroupStateResult>
          return combinedFuture.thenApply(v -> readSummaryResponsesToResult(futureMap));
      }
  
      /**
       * Takes in a list of COMPLETED futures and combines the results,
       * taking care of errors if any, into a single ReadShareGroupStateSummaryResult
       *
       * @param futureMap - HashMap of {topic -> {partition -> future}}
       * @return Object representing combined result of type ReadShareGroupStateSummaryResult
       */
      // visible for testing
      ReadShareGroupStateSummaryResult readSummaryResponsesToResult(
          Map<Uuid, Map<Integer, CompletableFuture<ReadShareGroupStateSummaryResponse>>> futureMap
      ) {
          List<TopicData<PartitionStateSummaryData>> topicsData = futureMap.keySet().stream()
              .map(topicId -> {
                  List<PartitionStateSummaryData> partitionStateErrorData = futureMap.get(topicId).entrySet().stream()
                      .map(partitionFuture -> {
                          int partition = partitionFuture.getKey();
                          CompletableFuture<ReadShareGroupStateSummaryResponse> future = partitionFuture.getValue();
                          try {
                              // already completed because of allOf call in the caller
                              ReadShareGroupStateSummaryResponse partitionResponse = future.join();
                              return partitionResponse.data().results().get(0).partitions().stream()
                                  .map(partitionResult -> PartitionFactory.newPartitionStateSummaryData(
                                      partitionResult.partition(),
                                      partitionResult.stateEpoch(),
                                      partitionResult.startOffset(),
                                      partitionResult.leaderEpoch(),
                                      partitionResult.errorCode(),
                                      partitionResult.errorMessage()))
                                  .toList();
                          } catch (Exception e) {
                              log.error("Unexpected exception while getting data from share coordinator", e);
                              return List.of(PartitionFactory.newPartitionStateSummaryData(
                                  partition,
                                  -1,
                                  -1,
                                  -1,
                                  Errors.UNKNOWN_SERVER_ERROR.code(),   // No specific public error code exists for InterruptedException / ExecutionException
                                  "Error reading state from share coordinator: " + e.getMessage()));
                          }
                      })
                      .flatMap(List::stream)
                      .toList();
                  return new TopicData<>(topicId, partitionStateErrorData);
              })
              .toList();
          return new ReadShareGroupStateSummaryResult.Builder()
              .setTopicsData(topicsData)
              .build();
      }
  
      /**
       * Takes in a list of COMPLETED futures and combines the results,
       * taking care of errors if any, into a single DeleteShareGroupStateResult
       *
       * @param futureMap - HashMap of {topic -> {partition -> future}}
       * @return Object representing combined result of type DeleteShareGroupStateResult
       */
      // visible for testing
      DeleteShareGroupStateResult deleteResponsesToResult(
          Map<Uuid, Map<Integer, CompletableFuture<DeleteShareGroupStateResponse>>> futureMap
      ) {
          List<TopicData<PartitionErrorData>> topicsData = futureMap.keySet().stream()
              .map(topicId -> {
                  List<PartitionErrorData> partitionErrorData = futureMap.get(topicId).entrySet().stream()
                      .map(partitionFuture -> {
                          int partition = partitionFuture.getKey();
                          CompletableFuture<DeleteShareGroupStateResponse> future = partitionFuture.getValue();
                          try {
                              // already completed because of allOf call in the caller
                              DeleteShareGroupStateResponse partitionResponse = future.join();
                              return partitionResponse.data().results().get(0).partitions().stream()
                                  .map(partitionResult -> PartitionFactory.newPartitionErrorData(
                                          partitionResult.partition(),
                                          partitionResult.errorCode(),
                                          partitionResult.errorMessage()
                                      )
                                  )
                                  .toList();
                          } catch (Exception e) {
                              log.error("Unexpected exception while getting data from share coordinator", e);
                              return List.of(
                                  PartitionFactory.newPartitionErrorData(
                                      partition,
                                      Errors.UNKNOWN_SERVER_ERROR.code(),   // No specific public error code exists for InterruptedException / ExecutionException
                                      "Error deleting state from share coordinator: " + e.getMessage()
                                  )
                              );
                          }
                      })
                      .flatMap(List::stream)
                      .toList();
                  return new TopicData<>(topicId, partitionErrorData);
              })
              .toList();
          return new DeleteShareGroupStateResult.Builder()
              .setTopicsData(topicsData)
              .build();
      }
  
      private static void validate(InitializeShareGroupStateParameters params) {
          String prefix = "Initialize share group parameters";
          if (params == null) {
              throw new IllegalArgumentException(prefix + " cannot be null.");
          }
          if (params.groupTopicPartitionData() == null) {
              throw new IllegalArgumentException(prefix + " data cannot be null.");
          }
  
          validateGroupTopicPartitionData(prefix, params.groupTopicPartitionData());
      }
      
      private static void validate(WriteShareGroupStateParameters params) {
          String prefix = "Write share group parameters";
          if (params == null) {
              throw new IllegalArgumentException(prefix + " cannot be null.");
          }
          if (params.groupTopicPartitionData() == null) {
              throw new IllegalArgumentException(prefix + " data cannot be null.");
          }
  
          validateGroupTopicPartitionData(prefix, params.groupTopicPartitionData());
      }
  
      private static void validate(ReadShareGroupStateParameters params) {
          String prefix = "Read share group parameters";
          if (params == null) {
              throw new IllegalArgumentException(prefix + " cannot be null.");
          }
          if (params.groupTopicPartitionData() == null) {
              throw new IllegalArgumentException(prefix + " data cannot be null.");
          }
  
          validateGroupTopicPartitionData(prefix, params.groupTopicPartitionData());
      }
  
      private static void validate(ReadShareGroupStateSummaryParameters params) {
          String prefix = "Read share group summary parameters";
          if (params == null) {
              throw new IllegalArgumentException(prefix + " cannot be null.");
          }
          if (params.groupTopicPartitionData() == null) {
              throw new IllegalArgumentException(prefix + " data cannot be null.");
          }
  
          validateGroupTopicPartitionData(prefix, params.groupTopicPartitionData());
      }
  
      private static void validate(DeleteShareGroupStateParameters params) {
          String prefix = "Delete share group parameters";
          if (params == null) {
              throw new IllegalArgumentException(prefix + " cannot be null.");
          }
          if (params.groupTopicPartitionData() == null) {
              throw new IllegalArgumentException(prefix + " data cannot be null.");
          }
  
          validateGroupTopicPartitionData(prefix, params.groupTopicPartitionData());
      }
  
      private static void validateGroupTopicPartitionData(String prefix, GroupTopicPartitionData<? extends PartitionIdData> data) {
          String groupId = data.groupId();
          if (groupId == null || groupId.isEmpty()) {
              throw new IllegalArgumentException(prefix + " groupId cannot be null or empty.");
          }
  
          List<? extends TopicData<? extends PartitionIdData>> topicsData = data.topicsData();
          if (isEmpty(topicsData)) {
              throw new IllegalArgumentException(prefix + " topics data cannot be null or empty.");
          }
  
          for (TopicData<? extends PartitionIdData> topicData : topicsData) {
              if (topicData.topicId() == null) {
                  throw new IllegalArgumentException(prefix + " topicId cannot be null.");
              }
              if (isEmpty(topicData.partitions())) {
                  throw new IllegalArgumentException(prefix + " partitions cannot be null or empty.");
              }
              for (PartitionIdData partitionData : topicData.partitions()) {
                  if (partitionData.partition() < 0) {
                      throw new IllegalArgumentException(
                          String.format("%s has invalid partitionId - %s %s %d", prefix, groupId, topicData.topicId(), partitionData.partition()));
                  }
              }
          }
      }
  
      private static boolean isEmpty(List<?> list) {
          return list == null || list.isEmpty();
      }
  }
  