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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  package org.apache.hadoop.hbase.regionserver.wal;
19  
20  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
21  import org.apache.hadoop.hbase.testclassification.SmallTests;
22  import org.apache.hadoop.hbase.testclassification.MetricsTests;
23  import org.junit.Test;
24  import org.junit.experimental.categories.Category;
25  
26  import static org.junit.Assert.assertSame;
27  import static org.junit.Assert.assertTrue;
28  
29  @Category({MetricsTests.class, SmallTests.class})
30  public class TestMetricsWALSourceImpl {
31  
32    @Test
33    public void testGetInstance() throws Exception {
34      MetricsWALSource walSource =
35          CompatibilitySingletonFactory.getInstance(MetricsWALSource.class);
36      assertTrue(walSource instanceof MetricsWALSourceImpl);
37      assertSame(walSource,
38          CompatibilitySingletonFactory.getInstance(MetricsWALSource.class));
39    }
40  }