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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.regionserver;
20  
21  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
22  import org.apache.hadoop.hbase.testclassification.SmallTests;
23  import org.apache.hadoop.hbase.testclassification.MetricsTests;
24  import org.junit.Test;
25  import org.junit.experimental.categories.Category;
26  
27  import static org.junit.Assert.assertSame;
28  import static org.junit.Assert.assertTrue;
29  
30  /**
31   *  Test for MetricsRegionServerSourceImpl
32   */
33  @Category({MetricsTests.class, SmallTests.class})
34  public class TestMetricsRegionServerSourceImpl {
35  
36    @Test
37    public void testGetInstance() throws Exception {
38      MetricsRegionServerSourceFactory metricsRegionServerSourceFactory =
39          CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
40      MetricsRegionServerSource serverSource =
41          metricsRegionServerSourceFactory.createServer(null);
42      assertTrue(serverSource instanceof MetricsRegionServerSourceImpl);
43      assertSame(metricsRegionServerSourceFactory,
44          CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class));
45    }
46  
47  
48    @Test(expected = RuntimeException.class)
49    public void testNoGetRegionServerMetricsSourceImpl() throws Exception {
50      // This should throw an exception because MetricsRegionServerSourceImpl should only
51      // be created by a factory.
52      CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceImpl.class);
53    }
54  }