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.sdk.metrics;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  import java.io.Closeable;
  import java.io.IOException;
  import org.junit.After;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mockito;
  
  /** Tests for {@link MetricsEnvironment}. */
  @RunWith(JUnit4.class)
  public class MetricsEnvironmentTest {
    @After
    public void teardown() {
      MetricsEnvironment.setCurrentContainer(null);
    }
  
    @Test
    public void testUsesAppropriateMetricsContainer() {
      Counter counter = Metrics.counter("ns", "name");
  
      MetricsContainer c1 = Mockito.mock(MetricsContainer.class);
      MetricsContainer c2 = Mockito.mock(MetricsContainer.class);
      Counter counter1 = Mockito.mock(Counter.class);
      Counter counter2 = Mockito.mock(Counter.class);
      when(c1.getCounter(MetricName.named("ns", "name"))).thenReturn(counter1);
      when(c2.getCounter(MetricName.named("ns", "name"))).thenReturn(counter2);
  
      assertNull(MetricsEnvironment.setCurrentContainer(c1));
      counter.inc();
      assertEquals(c1, MetricsEnvironment.setCurrentContainer(c2));
      counter.dec();
      assertEquals(c2, MetricsEnvironment.setCurrentContainer(null));
  
      verify(counter1).inc(1L);
      verify(counter2).inc(-1L);
      verifyNoMoreInteractions(counter1, counter2);
    }
  
    @Test
    public void testScopedMetricsContainers() throws IOException {
      Counter counter = Metrics.counter("ns", "name");
  
      MetricsContainer c1 = Mockito.mock(MetricsContainer.class);
      MetricsContainer c2 = Mockito.mock(MetricsContainer.class);
      Counter counter1 = Mockito.mock(Counter.class);
      Counter counter2 = Mockito.mock(Counter.class);
      when(c2.getCounter(MetricName.named("ns", "name"))).thenReturn(counter2);
      when(c1.getCounter(MetricName.named("ns", "name"))).thenReturn(counter1);
  
      try (Closeable close = MetricsEnvironment.scopedMetricsContainer(c1)) {
        try (Closeable close2 = MetricsEnvironment.scopedMetricsContainer(null)) {
          counter.inc(1000);
          try (Closeable close3 = MetricsEnvironment.scopedMetricsContainer(c2)) {
            counter.dec();
          }
        }
        counter.inc();
      }
      assertEquals(null, MetricsEnvironment.setCurrentContainer(null));
  
      verify(counter1).inc(1L);
      verify(counter2).inc(-1L);
      verifyNoMoreInteractions(counter1, counter2);
    }
  
    @Test
    public void testBehavesWithoutMetricsContainer() {
      assertNull(MetricsEnvironment.getCurrentContainer());
    }
  }
  