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.samza.metrics;
  
  import org.apache.beam.runners.core.DoFnRunner;
  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} wrapper with metrics. The class uses {@link SamzaMetricsContainer} to keep
   * BEAM metrics results and update Samza metrics.
   */
  public class DoFnRunnerWithMetrics<InT, OutT> implements DoFnRunner<InT, OutT> {
    private final DoFnRunner<InT, OutT> underlying;
    private final FnWithMetricsWrapper metricsWrapper;
  
    private DoFnRunnerWithMetrics(
        DoFnRunner<InT, OutT> underlying, SamzaMetricsContainer metricsContainer, String stepName) {
      this.underlying = underlying;
      this.metricsWrapper = new FnWithMetricsWrapper(metricsContainer, stepName);
    }
  
    public static <InT, OutT> DoFnRunner<InT, OutT> wrap(
        DoFnRunner<InT, OutT> doFnRunner, SamzaMetricsContainer metricsContainer, String stepName) {
      return new DoFnRunnerWithMetrics<>(doFnRunner, metricsContainer, stepName);
    }
  
    @Override
    public void startBundle() {
      withMetrics(underlying::startBundle, false);
    }
  
    @Override
    public void processElement(WindowedValue<InT> elem) {
      withMetrics(() -> underlying.processElement(elem), false);
    }
  
    @Override
    public <KeyT> void onTimer(
        String timerId,
        String timerFamilyId,
        KeyT key,
        BoundedWindow window,
        Instant timestamp,
        Instant outputTimestamp,
        TimeDomain timeDomain) {
      withMetrics(
          () ->
              underlying.onTimer(
                  timerId, timerFamilyId, key, window, timestamp, outputTimestamp, timeDomain),
          false);
    }
  
    @Override
    public void finishBundle() {
      withMetrics(underlying::finishBundle, true);
    }
  
    @Override
    public <KeyT> void onWindowExpiration(BoundedWindow window, Instant timestamp, KeyT key) {
      underlying.onWindowExpiration(window, timestamp, key);
    }
  
    @Override
    public DoFn<InT, OutT> getFn() {
      return underlying.getFn();
    }
  
    private void withMetrics(Runnable runnable, boolean shouldUpdateMetrics) {
      try {
        metricsWrapper.wrap(
            () -> {
              runnable.run();
              return (Void) null;
            },
            shouldUpdateMetrics);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }
  