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.beam.runners.dataflow.worker.counters;
  
  import org.apache.beam.sdk.util.common.ElementByteSizeObserver;
  
  /**
   * An observer that gets notified when additional bytes are read and/or used. It adds all bytes into
   * a local counter. When the observer gets advanced via the next() call, it adds the total byte
   * count to the specified counter, and prepares for the next element.
   */
  public class CounterBackedElementByteSizeObserver extends ElementByteSizeObserver {
    private final Counter<Long, ?> counter;
  
    public CounterBackedElementByteSizeObserver(Counter<Long, ?> counter) {
      this.counter = counter;
    }
  
    @Override
    protected void reportElementSize(long elementByteSize) {
      counter.addValue(elementByteSize);
    }
  }
  