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;
  
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  
  /**
   * Retrieves current wall clock timestamps as {@link System#currentTimeMillis()}.
   * <p>
   * Using this extractor effectively provides <i>processing-time</i> semantics.
   * <p>
   * If you need <i>event-time</i> semantics, use {@link FailOnInvalidTimestamp} with
   * built-in <i>CreateTime</i> or <i>LogAppendTime</i> timestamp (see KIP-32: Add timestamps to Kafka message for details).
   *
   * @see FailOnInvalidTimestamp
   * @see LogAndSkipOnInvalidTimestamp
   * @see UsePartitionTimeOnInvalidTimestamp
   */
  public class WallclockTimestampExtractor implements TimestampExtractor {
  
      /**
       * Return the current wall clock time as timestamp.
       *
       * @param record a data record
       * @param partitionTime the highest extracted valid timestamp of the current record's partition˙ (could be -1 if unknown)
       * @return the current wall clock time, expressed in milliseconds since midnight, January 1, 1970 UTC
       */
      @Override
      public long extract(final ConsumerRecord<Object, Object> record, final long partitionTime) {
          return System.currentTimeMillis();
      }
  }
  