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 java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.StreamSupport;
  import org.apache.beam.sdk.metrics.MetricQueryResults;
  import org.apache.beam.sdk.metrics.MetricResult;
  import org.apache.beam.sdk.metrics.MetricsOptions;
  import org.apache.beam.sdk.metrics.MetricsSink;
  
  /**
   * This sink just stores in a static field the first counter (if it exists) attempted value. This is
   * useful for tests.
   */
  public class TestMetricsSink implements MetricsSink {
  
    private static MetricQueryResults metricQueryResults;
    private static final String SYSTEM_METRIC_PREFIX = "metric:";
  
    public TestMetricsSink(MetricsOptions pipelineOptions) {}
  
    public static long getCounterValue(String counterName) {
      for (MetricResult<Long> metricResult : metricQueryResults.getCounters()) {
        if (metricResult.getName().getName().equals(counterName)) {
          return metricResult.getAttempted();
        }
      }
      return 0L;
    }
  
    public static List<MetricResult<Long>> getSystemCounters() {
      List<MetricResult<Long>> counters =
          StreamSupport.stream(metricQueryResults.getCounters().spliterator(), false)
              .filter(result -> result.getKey().metricName().getName().contains(SYSTEM_METRIC_PREFIX))
              .collect(Collectors.toList());
      return counters;
    }
  
    public static void clear() {
      metricQueryResults = null;
    }
  
    @Override
    public void writeMetrics(MetricQueryResults metricQueryResult) throws Exception {
      metricQueryResults = metricQueryResult;
    }
  }
  