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.regionserver;
019
020import static org.junit.jupiter.api.Assertions.assertSame;
021import static org.junit.jupiter.api.Assertions.assertThrows;
022import static org.junit.jupiter.api.Assertions.assertTrue;
023
024import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
025import org.apache.hadoop.hbase.testclassification.MetricsTests;
026import org.apache.hadoop.hbase.testclassification.SmallTests;
027import org.junit.jupiter.api.Tag;
028import org.junit.jupiter.api.Test;
029
030@Tag(MetricsTests.TAG)
031@Tag(SmallTests.TAG)
032public class TestMetricsRegionServerSourceImpl {
033
034  @Test
035  public void testGetInstance() {
036    MetricsRegionServerSourceFactory metricsRegionServerSourceFactory =
037      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
038    MetricsRegionServerSource serverSource = metricsRegionServerSourceFactory.createServer(null);
039    assertTrue(serverSource instanceof MetricsRegionServerSourceImpl);
040    assertSame(metricsRegionServerSourceFactory,
041      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class));
042  }
043
044  @Test
045  public void testNoGetRegionServerMetricsSourceImpl() {
046    // This should throw an exception because MetricsRegionServerSourceImpl should only
047    // be created by a factory.
048    assertThrows(RuntimeException.class, () -> {
049      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceImpl.class);
050    });
051  }
052}