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.DoFnRunner;
  import org.apache.beam.runners.core.metrics.MetricsContainerImpl;
  import org.apache.beam.sdk.metrics.MetricsEnvironment;
  import org.apache.beam.sdk.state.TimeDomain;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.joda.time.Instant;
  
  /**
   * {@link DoFnRunner} decorator which registers {@link MetricsContainerImpl}. It updates metrics to
   * Flink metrics and accumulators in {@link #finishBundle()}.
   */
  public class DoFnRunnerWithMetricsUpdate<InputT, OutputT> implements DoFnRunner<InputT, OutputT> {
  
    private final String stepName;
    private final FlinkMetricContainer container;
    private final DoFnRunner<InputT, OutputT> delegate;
  
    public DoFnRunnerWithMetricsUpdate(
        String stepName, DoFnRunner<InputT, OutputT> delegate, FlinkMetricContainer metricContainer) {
      this.stepName = stepName;
      this.delegate = delegate;
      this.container = metricContainer;
    }
  
    @Override
    public void startBundle() {
      try (Closeable ignored =
          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
        delegate.startBundle();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    @Override
    public void processElement(final WindowedValue<InputT> elem) {
      try (Closeable ignored =
          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
        delegate.processElement(elem);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    @Override
    public <KeyT> void onTimer(
        final String timerId,
        final String timerFamilyId,
        final KeyT key,
        final BoundedWindow window,
        final Instant timestamp,
        final Instant outputTimestamp,
        final TimeDomain timeDomain) {
      try (Closeable ignored =
          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
        delegate.onTimer(timerId, timerFamilyId, key, window, timestamp, outputTimestamp, timeDomain);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    @Override
    public void finishBundle() {
      try (Closeable ignored =
          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {
        delegate.finishBundle();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
  
      // update metrics
      container.updateMetrics(stepName);
    }
  
    @Override
    public <KeyT> void onWindowExpiration(BoundedWindow window, Instant timestamp, KeyT key) {
      delegate.onWindowExpiration(window, timestamp, key);
    }
  
    @Override
    public DoFn<InputT, OutputT> getFn() {
      return delegate.getFn();
    }
  }
  