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;
  
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.streams.processor.TaskId;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  public class MockChangelogReader implements ChangelogReader {
      private final Set<TopicPartition> restoringPartitions = new HashSet<>();
      private final Map<TopicPartition, Long> restoredOffsets = Collections.emptyMap();
  
      public boolean isPartitionRegistered(final TopicPartition partition) {
          return restoringPartitions.contains(partition);
      }
  
      @Override
      public void register(final TopicPartition partition, final ProcessorStateManager stateManager) {
          restoringPartitions.add(partition);
      }
  
      @Override
      public void register(final Set<TopicPartition> changelogPartitions, final ProcessorStateManager stateManager) {
          for (final TopicPartition changelogPartition : changelogPartitions) {
              register(changelogPartition, stateManager);
          }
      }
  
      @Override
      public long restore(final Map<TaskId, Task> tasks) {
          // do nothing
          return 0L;
      }
  
      @Override
      public void enforceRestoreActive() {
          // do nothing
      }
  
      @Override
      public void transitToUpdateStandby() {
          // do nothing
      }
  
      @Override
      public boolean isRestoringActive() {
          return true;
      }
  
      @Override
      public Set<TopicPartition> completedChangelogs() {
          // assuming all restoring partitions are completed
          return restoringPartitions;
      }
  
      @Override
      public boolean allChangelogsCompleted() {
          return false;
      }
  
      @Override
      public void clear() {
          restoringPartitions.clear();
      }
  
      @Override
      public void unregister(final Collection<TopicPartition> partitions) {
          restoringPartitions.removeAll(partitions);
  
          for (final TopicPartition partition : partitions) {
              restoredOffsets.remove(partition);
          }
      }
  
      @Override
      public boolean isEmpty() {
          return restoredOffsets.isEmpty() && restoringPartitions.isEmpty();
      }
  }
  