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.metrics.impl;
19
20 import static org.junit.Assert.assertEquals;
21
22 import java.util.concurrent.atomic.AtomicLong;
23
24 import org.apache.hadoop.hbase.metrics.Gauge;
25 import org.apache.hadoop.hbase.testclassification.SmallTests;
26 import org.junit.Test;
27 import org.junit.experimental.categories.Category;
28
29 /**
30 * Test class for {@link Gauge}.
31 */
32 @Category(SmallTests.class)
33 public class TestGauge {
34
35 @Test
36 public void testGetValue() {
37 SimpleGauge gauge = new SimpleGauge();
38
39 assertEquals(0, (long)gauge.getValue());
40
41 gauge.setValue(1000L);
42
43 assertEquals(1000L, (long)gauge.getValue());
44 }
45
46 /**
47 * Gauge implementation with a setter.
48 */
49 private static class SimpleGauge implements Gauge<Long> {
50
51 private final AtomicLong value = new AtomicLong(0L);
52
53 @Override public Long getValue() {
54 return this.value.get();
55 }
56
57 public void setValue(long value) {
58 this.value.set(value);
59 }
60 }
61 }