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.
   */
  // Copyright (c) Microsoft Corporation. All rights reserved.
  // Licensed under the MIT License.
  package org.apache.camel.quarkus.component.azure.eventhubs.it;
  
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.UUID;
  import java.util.concurrent.ConcurrentHashMap;
  
  import com.azure.core.util.CoreUtils;
  import com.azure.core.util.logging.ClientLogger;
  import com.azure.messaging.eventhubs.CheckpointStore;
  import com.azure.messaging.eventhubs.models.Checkpoint;
  import com.azure.messaging.eventhubs.models.PartitionOwnership;
  import reactor.core.publisher.Flux;
  import reactor.core.publisher.Mono;
  
  import static com.azure.messaging.eventhubs.implementation.ClientConstants.OWNER_ID_KEY;
  import static com.azure.messaging.eventhubs.implementation.ClientConstants.PARTITION_ID_KEY;
  import static com.azure.messaging.eventhubs.implementation.ClientConstants.SEQUENCE_NUMBER_KEY;
  
  /**
   * An in-memory checkpoint store. This is primarily to test custom event positioning. Inspired by
   * https://github.com/Azure/azure-sdk-for-java/blob/main/sdk/eventhubs/azure-messaging-eventhubs/src/samples/java/com/azure/messaging/eventhubs/SampleCheckpointStore.java
   */
  public class InMemoryCheckpointStore implements CheckpointStore {
      private static final String OWNERSHIP = "ownership";
      private static final String SEPARATOR = "/";
      private static final String CHECKPOINT = "checkpoint";
      private final Map<String, PartitionOwnership> partitionOwnershipMap = new ConcurrentHashMap<>();
      private final Map<String, Checkpoint> checkpointsMap = new ConcurrentHashMap<>();
      private static final ClientLogger LOGGER = new ClientLogger(InMemoryCheckpointStore.class);
  
      @Override
      public Flux<PartitionOwnership> listOwnership(String fullyQualifiedNamespace, String eventHubName,
              String consumerGroup) {
          LOGGER.info("Listing partition ownership");
  
          String prefix = prefixBuilder(fullyQualifiedNamespace, eventHubName, consumerGroup, OWNERSHIP);
          return Flux.fromIterable(partitionOwnershipMap.keySet())
                  .filter(key -> key.startsWith(prefix))
                  .map(key -> partitionOwnershipMap.get(key));
      }
  
      private String prefixBuilder(String fullyQualifiedNamespace, String eventHubName, String consumerGroup,
              String type) {
          return new StringBuilder()
                  .append(fullyQualifiedNamespace)
                  .append(SEPARATOR)
                  .append(eventHubName)
                  .append(SEPARATOR)
                  .append(consumerGroup)
                  .append(SEPARATOR)
                  .append(type)
                  .toString()
                  .toLowerCase(Locale.ROOT);
      }
  
      @Override
      public Flux<PartitionOwnership> claimOwnership(List<PartitionOwnership> requestedPartitionOwnerships) {
          if (CoreUtils.isNullOrEmpty(requestedPartitionOwnerships)) {
              return Flux.empty();
          }
          PartitionOwnership firstEntry = requestedPartitionOwnerships.get(0);
          String prefix = prefixBuilder(firstEntry.getFullyQualifiedNamespace(), firstEntry.getEventHubName(),
                  firstEntry.getConsumerGroup(), OWNERSHIP);
  
          return Flux.fromIterable(requestedPartitionOwnerships)
                  .filter(ownershipRequest -> {
                      final String key = prefix + SEPARATOR + ownershipRequest.getPartitionId();
                      final PartitionOwnership existing = partitionOwnershipMap.get(key);
  
                      if (existing == null) {
                          return true;
                      }
  
                      return existing.getETag().equals(ownershipRequest.getETag());
                  })
                  .doOnNext(partitionOwnership -> LOGGER.atInfo()
                          .addKeyValue(PARTITION_ID_KEY, partitionOwnership.getPartitionId())
                          .addKeyValue(OWNER_ID_KEY, partitionOwnership.getOwnerId())
                          .log("Ownership claimed"))
                  .map(partitionOwnership -> {
                      partitionOwnership.setETag(UUID.randomUUID().toString())
                              .setLastModifiedTime(System.currentTimeMillis());
  
                      final String key = prefix + SEPARATOR + partitionOwnership.getPartitionId();
                      partitionOwnershipMap.put(key, partitionOwnership);
  
                      return partitionOwnership;
                  });
      }
  
      @Override
      public Flux<Checkpoint> listCheckpoints(String fullyQualifiedNamespace, String eventHubName, String consumerGroup) {
          String prefix = prefixBuilder(fullyQualifiedNamespace, eventHubName, consumerGroup, CHECKPOINT);
          return Flux.fromIterable(checkpointsMap.keySet())
                  .filter(key -> key.startsWith(prefix))
                  .map(checkpointsMap::get);
      }
  
      @Override
      public Mono<Void> updateCheckpoint(Checkpoint checkpoint) {
          if (checkpoint == null) {
              return Mono.error(LOGGER.logExceptionAsError(new NullPointerException("checkpoint cannot be null")));
          }
  
          String prefix = prefixBuilder(checkpoint.getFullyQualifiedNamespace(), checkpoint.getEventHubName(),
                  checkpoint.getConsumerGroup(), CHECKPOINT);
          checkpointsMap.put(prefix + SEPARATOR + checkpoint.getPartitionId(), checkpoint);
          LOGGER.atInfo()
                  .addKeyValue(PARTITION_ID_KEY, checkpoint.getPartitionId())
                  .addKeyValue(SEQUENCE_NUMBER_KEY, checkpoint.getSequenceNumber())
                  .log("Updated checkpoint.");
          return Mono.empty();
      }
  }
  