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.spark.metrics;
  
  import org.apache.beam.runners.core.metrics.MetricsContainerStepMap;
  import org.apache.spark.util.AccumulatorV2;
  
  /** {@link AccumulatorV2} implementation for {@link MetricsContainerStepMap}. */
  public class MetricsContainerStepMapAccumulator
      extends AccumulatorV2<MetricsContainerStepMap, MetricsContainerStepMap> {
    private static final MetricsContainerStepMap empty = new SparkMetricsContainerStepMap();
  
    private MetricsContainerStepMap value;
  
    public MetricsContainerStepMapAccumulator(MetricsContainerStepMap value) {
      this.value = value;
    }
  
    @Override
    public boolean isZero() {
      return value.equals(empty);
    }
  
    @Override
    public MetricsContainerStepMapAccumulator copy() {
      MetricsContainerStepMap newContainer = new SparkMetricsContainerStepMap();
      newContainer.updateAll(value);
      return new MetricsContainerStepMapAccumulator(newContainer);
    }
  
    @Override
    public void reset() {
      this.value = new SparkMetricsContainerStepMap();
    }
  
    @Override
    public void add(MetricsContainerStepMap other) {
      this.value.updateAll(other);
    }
  
    @Override
    public void merge(AccumulatorV2<MetricsContainerStepMap, MetricsContainerStepMap> other) {
      this.value.updateAll(other.value());
    }
  
    @Override
    public MetricsContainerStepMap value() {
      return this.value;
    }
  }
  