/*
 * 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.MetricQueryResults;
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
 * usefull for tests.
 */
public class TestMetricsSink implements MetricsSink {

  private static long counterValue;

  public TestMetricsSink(MetricsOptions pipelineOptions) {}

  public static long getCounterValue() {
    return counterValue;
  }

  public static void clear() {
    counterValue = 0L;
  }

  @Override
  public void writeMetrics(MetricQueryResults metricQueryResults) throws Exception {
    counterValue =
        metricQueryResults.getCounters().iterator().hasNext()
            ? metricQueryResults.getCounters().iterator().next().getAttempted()
            : 0L;
  }
}
