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.AssignmentConfigs;
  import org.apache.kafka.streams.processor.assignment.ProcessId;
  
  import java.util.Map;
  import java.util.Set;
  
  interface StandbyTaskAssignor extends LegacyTaskAssignor {
      default boolean isAllowedTaskMovement(final ClientState source, final ClientState destination) {
          return true;
      }
  
      /**
       * If a specific task can be moved from source to destination
       * @param source Source client
       * @param destination Destination client
       * @param sourceTask Task to move
       * @param clientStateMap All client metadata
       * @return True if task can be moved, false otherwise
       */
      default boolean isAllowedTaskMovement(final ClientState source,
                                            final ClientState destination,
                                            final TaskId sourceTask,
                                            final Map<ProcessId, ClientState> clientStateMap) {
          return true;
      }
  
      default boolean assign(final Map<ProcessId, ClientState> clients,
                             final Set<TaskId> allTaskIds,
                             final Set<TaskId> statefulTaskIds,
                             final RackAwareTaskAssignor rackAwareTaskAssignor,
                             final AssignmentConfigs configs) {
          return assign(clients, allTaskIds, statefulTaskIds, configs);
      }
  
      boolean assign(final Map<ProcessId, ClientState> clients,
                     final Set<TaskId> allTaskIds,
                     final Set<TaskId> statefulTaskIds,
                     final AssignmentConfigs configs);
  }