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;
  
  import java.util.Map;
  import java.util.TreeMap;
  import org.apache.beam.runners.dataflow.worker.counters.Counter;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.ShuffleReadCounter;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.ShuffleReadCounterFactory;
  
  /**
   * Factor class to create ShuffleReadCounters in test This class maintains a map of every
   * shuffleReadCounters created for each shuffle step. Note: There is one ShuffleReadCounter for each
   * GroupingShuffleReader associated with a unique GBK/shuffle.
   */
  public class TestShuffleReadCounterFactory extends ShuffleReadCounterFactory {
  
    private TreeMap<String, ShuffleReadCounter> originalShuffleStepToCounter;
  
    public TestShuffleReadCounterFactory() {
      this.originalShuffleStepToCounter = new TreeMap<>();
    }
  
    @Override
    public ShuffleReadCounter create(
        String originalShuffleStepName,
        boolean experimentEnabled,
        Counter<Long, Long> legacyPerOperationPerDatasetBytesCounter) {
      ShuffleReadCounter src =
          new ShuffleReadCounter(
              originalShuffleStepName, experimentEnabled, legacyPerOperationPerDatasetBytesCounter);
      originalShuffleStepToCounter.put(originalShuffleStepName, src);
      return src;
    }
  
    public ShuffleReadCounter getOnlyShuffleReadCounterOrNull() {
      if (originalShuffleStepToCounter.size() == 1) {
        return originalShuffleStepToCounter.firstEntry().getValue();
      }
      return null;
    }
  
    public Map<String, ShuffleReadCounter> shuffleReadCounters() {
      return originalShuffleStepToCounter;
    }
  }
  