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.core.metrics;
  
  import java.io.Serializable;
  
  /**
   * A {@link MetricCell} is used for accumulating in-memory changes to a metric. It represents a
   * specific metric name in a single context.
   *
   * @param <DataT> The type of metric data stored (and extracted) from this cell.
   */
  public interface MetricCell<DataT> extends Serializable {
    /**
     * Return the {@link DirtyState} tracking whether this metric cell contains uncommitted changes.
     */
    DirtyState getDirty();
  
    /** Return the cumulative value of this metric. */
    DataT getCumulative();
  
    /** Reset this metric. */
    void reset();
  }
  