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.streams.processor.internals.assignment;
  
  import org.apache.kafka.streams.processor.TaskId;
  import org.apache.kafka.streams.processor.assignment.ApplicationState;
  import org.apache.kafka.streams.processor.assignment.AssignmentConfigs;
  import org.apache.kafka.streams.processor.assignment.KafkaStreamsState;
  import org.apache.kafka.streams.processor.assignment.ProcessId;
  import org.apache.kafka.streams.processor.assignment.TaskInfo;
  import org.apache.kafka.streams.processor.internals.StreamsPartitionAssignor;
  import org.apache.kafka.streams.processor.internals.StreamsPartitionAssignor.ClientMetadata;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  
  import static java.util.Collections.unmodifiableMap;
  
  public class DefaultApplicationState implements ApplicationState {
  
      private final AssignmentConfigs assignmentConfigs;
      private final Map<TaskId, TaskInfo> tasks;
      private final Map<ProcessId, ClientMetadata> clientStates;
  
      private final Map<Boolean, Map<ProcessId, KafkaStreamsState>> cachedKafkaStreamStates;
  
      public DefaultApplicationState(final AssignmentConfigs assignmentConfigs,
                                     final Map<TaskId, TaskInfo> tasks,
                                     final Map<ProcessId, ClientMetadata> clientStates) {
          this.assignmentConfigs = assignmentConfigs;
          this.tasks = unmodifiableMap(tasks);
          this.clientStates = clientStates;
          this.cachedKafkaStreamStates = new HashMap<>();
      }
  
      @Override
      public Map<ProcessId, KafkaStreamsState> kafkaStreamsStates(final boolean computeTaskLags) {
          if (cachedKafkaStreamStates.containsKey(computeTaskLags)) {
              return cachedKafkaStreamStates.get(computeTaskLags);
          }
  
          final Map<ProcessId, KafkaStreamsState> kafkaStreamsStates = new HashMap<>();
          for (final Map.Entry<ProcessId, StreamsPartitionAssignor.ClientMetadata> clientEntry : clientStates.entrySet()) {
              final ClientMetadata metadata = clientEntry.getValue();
              final ClientState clientState = metadata.state();
              final ProcessId processId = clientEntry.getKey();
              final Map<TaskId, Long> taskLagTotals = computeTaskLags ? clientState.taskLagTotals() : null;
              final KafkaStreamsState kafkaStreamsState = new DefaultKafkaStreamsState(
                  processId,
                  clientState.capacity(),
                  clientState.clientTags(),
                  clientState.previousActiveTasks(),
                  clientState.previousStandbyTasks(),
                  clientState.taskIdsByPreviousConsumer(),
                  Optional.ofNullable(metadata.hostInfo()),
                  Optional.ofNullable(taskLagTotals),
                  metadata.rackId()
              );
              kafkaStreamsStates.put(processId, kafkaStreamsState);
          }
  
          cachedKafkaStreamStates.put(computeTaskLags, kafkaStreamsStates);
          return kafkaStreamsStates;
      }
  
      @Override
      public AssignmentConfigs assignmentConfigs() {
          return assignmentConfigs;
      }
  
      @Override
      public Map<TaskId, TaskInfo> allTasks() {
          return tasks;
      }
  }
  