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 org.apache.beam.sdk.metrics.BoundedTrieResult;
  import org.apache.beam.sdk.metrics.DistributionResult;
  import org.apache.beam.sdk.metrics.GaugeResult;
  import org.apache.beam.sdk.metrics.MetricFiltering;
  import org.apache.beam.sdk.metrics.MetricQueryResults;
  import org.apache.beam.sdk.metrics.MetricResult;
  import org.apache.beam.sdk.metrics.MetricResults;
  import org.apache.beam.sdk.metrics.MetricsFilter;
  import org.apache.beam.sdk.metrics.StringSetResult;
  import org.apache.beam.sdk.util.HistogramData;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Default implementation of {@link org.apache.beam.sdk.metrics.MetricResults}, which takes static
   * {@link Iterable}s of counters, distributions, gauges, and stringsets, and serves queries by
   * applying {@link org.apache.beam.sdk.metrics.MetricsFilter}s linearly to them.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class DefaultMetricResults extends MetricResults {
  
    private final Iterable<MetricResult<Long>> counters;
    private final Iterable<MetricResult<DistributionResult>> distributions;
    private final Iterable<MetricResult<GaugeResult>> gauges;
    private final Iterable<MetricResult<StringSetResult>> stringSets;
    private final Iterable<MetricResult<BoundedTrieResult>> boundedTries;
    private final Iterable<MetricResult<HistogramData>> histograms;
  
    public DefaultMetricResults(
        Iterable<MetricResult<Long>> counters,
        Iterable<MetricResult<DistributionResult>> distributions,
        Iterable<MetricResult<GaugeResult>> gauges,
        Iterable<MetricResult<StringSetResult>> stringSets,
        Iterable<MetricResult<BoundedTrieResult>> boundedTries,
        Iterable<MetricResult<HistogramData>> histograms) {
      this.counters = counters;
      this.distributions = distributions;
      this.gauges = gauges;
      this.stringSets = stringSets;
      this.boundedTries = boundedTries;
      this.histograms = histograms;
    }
  
    @Override
    public MetricQueryResults queryMetrics(@Nullable MetricsFilter filter) {
      return MetricQueryResults.create(
          Iterables.filter(counters, counter -> MetricFiltering.matches(filter, counter.getKey())),
          Iterables.filter(
              distributions, distribution -> MetricFiltering.matches(filter, distribution.getKey())),
          Iterables.filter(gauges, gauge -> MetricFiltering.matches(filter, gauge.getKey())),
          Iterables.filter(
              stringSets, stringSets -> MetricFiltering.matches(filter, stringSets.getKey())),
          Iterables.filter(
              boundedTries, boundedTries -> MetricFiltering.matches(filter, boundedTries.getKey())),
          Iterables.filter(
              histograms, histogram -> MetricFiltering.matches(filter, histogram.getKey())));
    }
  }
  