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.producer.internals;
  
  import org.apache.kafka.clients.producer.RecordMetadata;
  import org.apache.kafka.common.utils.Time;
  
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  /**
   * The future result of a record send
   */
  public final class FutureRecordMetadata implements Future<RecordMetadata> {
  
      private final ProduceRequestResult result;
      private final int batchIndex;
      private final long createTimestamp;
      private final int serializedKeySize;
      private final int serializedValueSize;
      private final Time time;
      private volatile FutureRecordMetadata nextRecordMetadata = null;
  
      public FutureRecordMetadata(ProduceRequestResult result, int batchIndex, long createTimestamp, int serializedKeySize,
                                  int serializedValueSize, Time time) {
          this.result = result;
          this.batchIndex = batchIndex;
          this.createTimestamp = createTimestamp;
          this.serializedKeySize = serializedKeySize;
          this.serializedValueSize = serializedValueSize;
          this.time = time;
      }
  
      @Override
      public boolean cancel(boolean interrupt) {
          return false;
      }
  
      @Override
      public boolean isCancelled() {
          return false;
      }
  
      @Override
      public RecordMetadata get() throws InterruptedException, ExecutionException {
          this.result.await();
          if (nextRecordMetadata != null)
              return nextRecordMetadata.get();
          return valueOrError();
      }
  
      @Override
      public RecordMetadata get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
          // Handle overflow.
          long now = time.milliseconds();
          long timeoutMillis = unit.toMillis(timeout);
          long deadline = Long.MAX_VALUE - timeoutMillis < now ? Long.MAX_VALUE : now + timeoutMillis;
          boolean occurred = this.result.await(timeout, unit);
          if (!occurred)
              throw new TimeoutException("Timeout after waiting for " + timeoutMillis + " ms.");
          if (nextRecordMetadata != null)
              return nextRecordMetadata.get(deadline - time.milliseconds(), TimeUnit.MILLISECONDS);
          return valueOrError();
      }
  
      /**
       * This method is used when we have to split a large batch in smaller ones. A chained metadata will allow the
       * future that has already returned to the users to wait on the newly created split batches even after the
       * old big batch has been deemed as done.
       */
      void chain(FutureRecordMetadata futureRecordMetadata) {
          if (nextRecordMetadata == null)
              nextRecordMetadata = futureRecordMetadata;
          else
              nextRecordMetadata.chain(futureRecordMetadata);
      }
  
      RecordMetadata valueOrError() throws ExecutionException {
          RuntimeException exception = this.result.error(batchIndex);
          if (exception != null)
              throw new ExecutionException(exception);
          else
              return value();
      }
  
      RecordMetadata value() {
          if (nextRecordMetadata != null)
              return nextRecordMetadata.value();
          return new RecordMetadata(result.topicPartition(), this.result.baseOffset(), this.batchIndex,
                                    timestamp(), this.serializedKeySize, this.serializedValueSize);
      }
  
      private long timestamp() {
          return result.hasLogAppendTime() ? result.logAppendTime() : createTimestamp;
      }
  
      @Override
      public boolean isDone() {
          if (nextRecordMetadata != null)
              return nextRecordMetadata.isDone();
          return this.result.completed();
      }
  
  }
  