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.Assert.assertSame;
021import static org.junit.Assert.assertTrue;
022
023import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
024import org.apache.hadoop.hbase.HBaseClassTestRule;
025import org.apache.hadoop.hbase.testclassification.MetricsTests;
026import org.apache.hadoop.hbase.testclassification.SmallTests;
027import org.junit.ClassRule;
028import org.junit.Test;
029import org.junit.experimental.categories.Category;
030
031@Category({ MetricsTests.class, SmallTests.class })
032public class TestMetricsRegionServerSourceImpl {
033  @ClassRule
034  public static final HBaseClassTestRule CLASS_RULE =
035    HBaseClassTestRule.forClass(TestMetricsRegionServerSourceImpl.class);
036
037  @Test
038  public void testGetInstance() {
039    MetricsRegionServerSourceFactory metricsRegionServerSourceFactory =
040      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
041    MetricsRegionServerSource serverSource = metricsRegionServerSourceFactory.createServer(null);
042    assertTrue(serverSource instanceof MetricsRegionServerSourceImpl);
043    assertSame(metricsRegionServerSourceFactory,
044      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class));
045  }
046
047  @Test(expected = RuntimeException.class)
048  public void testNoGetRegionServerMetricsSourceImpl() {
049    // This should throw an exception because MetricsRegionServerSourceImpl should only
050    // be created by a factory.
051    CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceImpl.class);
052  }
053}