/**
    * 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.hadoop.hbase.metrics.impl;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  import org.apache.hadoop.hbase.metrics.MetricRegistryInfo;
  import org.apache.hadoop.hbase.testclassification.MetricsTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.metrics2.MetricsSource;
  import org.apache.hadoop.metrics2.MetricsSystem;
  import org.apache.hadoop.metrics2.annotation.Metric;
  import org.apache.hadoop.metrics2.annotation.Metrics;
  import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
  import org.apache.hadoop.metrics2.lib.MetricsRegistry;
  import org.apache.hadoop.metrics2.lib.MutableCounterLong;
  import org.apache.hadoop.metrics2.lib.MutableGaugeLong;
  import org.apache.hadoop.metrics2.lib.MutableRate;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.mockito.Mockito;
  
  @Category({ MetricsTests.class, SmallTests.class })
  public class TestGlobalMetricRegistriesAdapter {
  
    /**
     * Tests that using reflection to unregister the Hadoop metrics source works properly
     */
    @Test
    public void testUnregisterSource() {
      GlobalMetricRegistriesAdapter adapter = GlobalMetricRegistriesAdapter.init();
      // we'll configure the sources manually, so disable the executor
      adapter.stop();
      TestSource ts1 = new TestSource("ts1");
      TestSource ts2 = new TestSource("ts2");
      MetricsSystem metricsSystem = DefaultMetricsSystem.instance();
      metricsSystem.register("ts1", "", ts1);
      metricsSystem.register("ts2", "", ts2);
      MetricsSource s1 = metricsSystem.getSource("ts1");
      assertNotNull(s1);
      MetricRegistryInfo mockRegistryInfo = Mockito.mock(MetricRegistryInfo.class);
      Mockito.when(mockRegistryInfo.getMetricsJmxContext()).thenReturn("ts1");
      adapter.unregisterSource(mockRegistryInfo);
      s1 = metricsSystem.getSource("ts1");
      assertNull(s1);
      MetricsSource s2 = metricsSystem.getSource("ts2");
      assertNotNull(s2);
    }
  
    @Metrics(context = "test")
    private static class TestSource {
      @Metric("C1 desc")
      MutableCounterLong c1;
      @Metric("XXX desc")
      MutableCounterLong xxx;
      @Metric("G1 desc")
      MutableGaugeLong g1;
      @Metric("YYY desc")
      MutableGaugeLong yyy;
      @Metric
      MutableRate s1;
      @SuppressWarnings("unused")
      final MetricsRegistry registry;
  
      TestSource(String recName) {
        registry = new MetricsRegistry(recName);
      }
    }
  
  }