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.flink.metrics;
  
  import java.io.Closeable;
  import java.io.IOException;
  import org.apache.beam.runners.core.metrics.MetricsContainerImpl;
  import org.apache.beam.runners.flink.FlinkPipelineOptions;
  import org.apache.beam.sdk.io.Source;
  import org.apache.beam.sdk.metrics.MetricsEnvironment;
  import org.apache.beam.sdk.options.PipelineOptions;
  
  /**
   * Util for invoking {@link Source.Reader} methods that might require a {@link MetricsContainerImpl}
   * to be active. Source.Reader decorator which registers {@link MetricsContainerImpl}. It update
   * metrics to Flink metric and accumulator in start and advance.
   */
  public class ReaderInvocationUtil<OutputT, ReaderT extends Source.Reader<OutputT>> {
  
    private final String stepName;
    private final FlinkMetricContainerBase container;
    private final Boolean enableMetrics;
  
    public ReaderInvocationUtil(
        String stepName, PipelineOptions options, FlinkMetricContainerBase container) {
      FlinkPipelineOptions flinkPipelineOptions = options.as(FlinkPipelineOptions.class);
      this.stepName = stepName;
      this.enableMetrics = !flinkPipelineOptions.getDisableMetrics();
      this.container = container;
    }
  
    public boolean invokeStart(ReaderT reader) throws IOException {
      if (enableMetrics) {
        try (Closeable ignored =
            MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
          boolean result = reader.start();
          container.updateMetrics(stepName);
          return result;
        }
      } else {
        return reader.start();
      }
    }
  
    public boolean invokeAdvance(ReaderT reader) throws IOException {
      if (enableMetrics) {
        try (Closeable ignored =
            MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
          boolean result = reader.advance();
          container.updateMetrics(stepName);
          return result;
        }
      } else {
        return reader.advance();
      }
    }
  }
  