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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.wal;
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  
25  import org.junit.Test;
26  import org.junit.experimental.categories.Category;
27  
28  import static org.junit.Assert.assertSame;
29  import static org.junit.Assert.assertTrue;
30  
31  @Category({MetricsTests.class, SmallTests.class})
32  public class TestMetricsWALSourceImpl {
33  
34    @Test
35    public void testGetInstance() throws Exception {
36      MetricsWALSource walSource =
37          CompatibilitySingletonFactory.getInstance(MetricsWALSource.class);
38      assertTrue(walSource instanceof MetricsWALSourceImpl);
39      assertSame(walSource,
40          CompatibilitySingletonFactory.getInstance(MetricsWALSource.class));
41    }
42  }