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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.spark.aggregators.metrics.sink;
  
  import com.codahale.metrics.Gauge;
  import com.codahale.metrics.MetricFilter;
  import com.codahale.metrics.MetricRegistry;
  import java.util.Collection;
  import java.util.Properties;
  import org.apache.beam.runners.spark.metrics.WithMetricsSupport;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.apache.spark.metrics.sink.Sink;
  
  /** An in-memory {@link Sink} implementation for tests. */
  public class InMemoryMetrics implements Sink {
  
    private static WithMetricsSupport extendedMetricsRegistry;
    private static MetricRegistry internalMetricRegistry;
  
    // Constructor for Spark 3.1
    @SuppressWarnings("UnusedParameters")
    public InMemoryMetrics(
        final Properties properties,
        final MetricRegistry metricRegistry,
        final org.apache.spark.SecurityManager securityMgr) {
      extendedMetricsRegistry = WithMetricsSupport.forRegistry(metricRegistry);
      internalMetricRegistry = metricRegistry;
    }
  
    // Constructor for Spark >= 3.2
    @SuppressWarnings("UnusedParameters")
    public InMemoryMetrics(final Properties properties, final MetricRegistry metricRegistry) {
      extendedMetricsRegistry = WithMetricsSupport.forRegistry(metricRegistry);
      internalMetricRegistry = metricRegistry;
    }
  
    @SuppressWarnings({"TypeParameterUnusedInFormals", "rawtypes"})
    public static <T> T valueOf(final String name) {
      // this might fail in case we have multiple aggregators with the same suffix after
      // the last dot, but it should be good enough for tests.
      if (extendedMetricsRegistry != null) {
        Collection<Gauge> matches =
            extendedMetricsRegistry.getGauges((n, m) -> n.endsWith(name)).values();
        return matches.isEmpty() ? null : (T) Iterables.getOnlyElement(matches).getValue();
      } else {
        return null;
      }
    }
  
    @SuppressWarnings("WeakerAccess")
    public static void clearAll() {
      if (internalMetricRegistry != null) {
        internalMetricRegistry.removeMatching(MetricFilter.ALL);
      }
    }
  
    @Override
    public void start() {}
  
    @Override
    public void stop() {}
  
    @Override
    public void report() {}
  }
  