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.clients.admin;
  
  import org.apache.kafka.clients.admin.internals.CoordinatorKey;
  import org.apache.kafka.common.KafkaFuture;
  import org.apache.kafka.common.utils.ProducerIdAndEpoch;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  /**
   * The result of the {@link Admin#fenceProducers(Collection)} call.
   */
  public class FenceProducersResult {
  
      private final Map<CoordinatorKey, KafkaFuture<ProducerIdAndEpoch>> futures;
  
      FenceProducersResult(Map<CoordinatorKey, KafkaFuture<ProducerIdAndEpoch>> futures) {
          this.futures = futures;
      }
  
      /**
       * Return a map from transactional ID to futures which can be used to check the status of
       * individual fencings.
       */
      public Map<String, KafkaFuture<Void>> fencedProducers() {
          return futures.entrySet().stream().collect(Collectors.toMap(
              e -> e.getKey().idValue,
              e -> e.getValue().thenApply(p -> null)
          ));
      }
  
      /**
       * Returns a future that provides the producer ID generated while initializing the given transaction when the request completes.
       */
      public KafkaFuture<Long> producerId(String transactionalId) {
          return findAndApply(transactionalId, p -> p.producerId);
      }
  
      /**
       * Returns a future that provides the epoch ID generated while initializing the given transaction when the request completes.
       */
      public KafkaFuture<Short> epochId(String transactionalId) {
          return findAndApply(transactionalId, p -> p.epoch);
      }
  
      /**
       * Return a future which succeeds only if all the producer fencings succeed.
       */
      public KafkaFuture<Void> all() {
          return KafkaFuture.allOf(futures.values().toArray(new KafkaFuture<?>[0]));
      }
  
      private <T> KafkaFuture<T> findAndApply(String transactionalId, KafkaFuture.BaseFunction<ProducerIdAndEpoch, T> followup) {
          CoordinatorKey key = CoordinatorKey.byTransactionalId(transactionalId);
          KafkaFuture<ProducerIdAndEpoch> future = futures.get(key);
          if (future == null) {
              throw new IllegalArgumentException("TransactionalId " +
                  "`" + transactionalId + "` was not included in the request");
          }
          return future.thenApply(followup);
      }
  }
  