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 static org.junit.Assert.assertNull;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import org.apache.beam.sdk.metrics.Counter;
  import org.apache.beam.sdk.metrics.MetricsContainer;
  import org.apache.beam.sdk.metrics.MetricsEnvironment;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.mockito.Mockito;
  
  /** Tests for {@link LabeledMetrics}. */
  public class LabeledMetricsTest implements Serializable {
  
    @Rule public final transient ExpectedException thrown = ExpectedException.none();
  
    @Test
    public void testCounterDoesNotFailOperationsWhenNoMetricsContainerPresent() {
      MetricsEnvironment.setCurrentContainer(null);
      assertNull(MetricsEnvironment.getCurrentContainer());
      HashMap<String, String> labels = new HashMap<String, String>();
      String urn = MonitoringInfoConstants.Urns.ELEMENT_COUNT;
      MonitoringInfoMetricName name = MonitoringInfoMetricName.named(urn, labels);
  
      Counter counter = LabeledMetrics.counter(name);
      counter.inc();
      counter.inc(5L);
      counter.dec();
      counter.dec(5L);
    }
  
    @Test
    public void testOperationsUpdateCounterFromContainerWhenContainerIsPresent() {
      HashMap<String, String> labels = new HashMap<String, String>();
      String urn = MonitoringInfoConstants.Urns.ELEMENT_COUNT;
      MonitoringInfoMetricName name = MonitoringInfoMetricName.named(urn, labels);
  
      MetricsContainer mockContainer = Mockito.mock(MetricsContainer.class);
      Counter mockCounter = Mockito.mock(Counter.class);
      when(mockContainer.getCounter(name)).thenReturn(mockCounter);
  
      Counter counter = LabeledMetrics.counter(name);
  
      MetricsEnvironment.setCurrentContainer(mockContainer);
      counter.inc();
      verify(mockCounter).inc(1);
  
      counter.inc(47L);
      verify(mockCounter).inc(47);
  
      counter.dec(5L);
      verify(mockCounter).inc(-5);
    }
  }
  