001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.metrics.impl;
019
020import static org.junit.Assert.assertTrue;
021
022import java.util.Optional;
023import org.apache.hadoop.hbase.HBaseClassTestRule;
024import org.apache.hadoop.hbase.metrics.MetricRegistries;
025import org.apache.hadoop.hbase.metrics.MetricRegistry;
026import org.apache.hadoop.hbase.metrics.MetricRegistryInfo;
027import org.apache.hadoop.hbase.testclassification.SmallTests;
028import org.junit.ClassRule;
029import org.junit.Test;
030import org.junit.experimental.categories.Category;
031
032/**
033 * Test class for {@link MetricRegistries}.
034 */
035@Category(SmallTests.class)
036public class TestMetricRegistriesImpl {
037
038  @ClassRule
039  public static final HBaseClassTestRule CLASS_RULE =
040    HBaseClassTestRule.forClass(TestMetricRegistriesImpl.class);
041
042  @Test
043  public void testMetricsRegistriesRemoveRef() {
044    MetricRegistryInfo registryInfo =
045      new MetricRegistryInfo("testMetrics", null, null, null, false);
046    MetricRegistries.global().create(registryInfo);
047    Optional<MetricRegistry> registry1 = MetricRegistries.global().get(registryInfo);
048    assertTrue(registry1.isPresent());
049
050    MetricRegistries.global().create(registryInfo);
051    Optional<MetricRegistry> registry2 = MetricRegistries.global().get(registryInfo);
052    assertTrue(registry2.isPresent());
053
054    MetricRegistries.global().remove(registryInfo);
055    Optional<MetricRegistry> registry3 = MetricRegistries.global().get(registryInfo);
056    assertTrue(registry3.isPresent());
057
058    MetricRegistries.global().remove(registryInfo);
059    Optional<MetricRegistry> registry4 = MetricRegistries.global().get(registryInfo);
060    assertTrue(!registry4.isPresent());
061  }
062}