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.StreamsConfig;
  import org.apache.kafka.streams.processor.TaskId;
  import org.apache.kafka.streams.processor.assignment.AssignmentConfigs;
  import org.apache.kafka.streams.processor.internals.TopologyMetadata.Subtopology;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeMap;
  
  public class RackAwareGraphConstructorFactory {
  
      static <T> RackAwareGraphConstructor<T> create(final AssignmentConfigs assignmentConfigs,
                                                     final Map<Subtopology, Set<TaskId>> tasksForTopicGroup) {
          return create(assignmentConfigs.rackAwareAssignmentStrategy(), new ArrayList<>(new TreeMap<>(tasksForTopicGroup).values()));
      }
  
      public static <T> RackAwareGraphConstructor<T> create(final String rackAwareAssignmentStrategy,
                                                            final Collection<TaskId> allTasks) {
          final Map<Integer, Set<TaskId>> tasksForTopologyId = new TreeMap<>();
          allTasks.forEach(taskId -> {
              tasksForTopologyId.computeIfAbsent(taskId.subtopology(), k -> new HashSet<>());
              tasksForTopologyId.get(taskId.subtopology()).add(taskId);
          });
  
          final List<Set<TaskId>> tasksForTopicGroup = new ArrayList<>();
          tasksForTopologyId.forEach((subtopology, taskIds) -> {
              tasksForTopicGroup.add(taskIds);
          });
          return create(rackAwareAssignmentStrategy, tasksForTopicGroup);
      }
  
      public static <T> RackAwareGraphConstructor<T> create(final String rackAwareAssignmentStrategy,
                                                            final List<Set<TaskId>> taskSetsPerTopicGroup) {
          switch (rackAwareAssignmentStrategy) {
              case StreamsConfig.RACK_AWARE_ASSIGNMENT_STRATEGY_MIN_TRAFFIC:
                  return new MinTrafficGraphConstructor<T>();
              case StreamsConfig.RACK_AWARE_ASSIGNMENT_STRATEGY_BALANCE_SUBTOPOLOGY:
                  return new BalanceSubtopologyGraphConstructor<T>(taskSetsPerTopicGroup);
              default:
                  throw new IllegalArgumentException("Rack aware assignment is disabled");
          }
      }
  }
  