1/*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.cache;
18
19import junit.framework.TestCase;
20
21/**
22 * Unit test for {@link CacheStats}.
23 *
24 * @author Charles Fry
25 */
26public class CacheStatsTest extends TestCase {
27
28  public void testEmpty() {
29    CacheStats stats = new CacheStats(0, 0, 0, 0, 0, 0);
30    assertEquals(0, stats.requestCount());
31    assertEquals(0, stats.hitCount());
32    assertEquals(1.0, stats.hitRate());
33    assertEquals(0, stats.missCount());
34    assertEquals(0.0, stats.missRate());
35    assertEquals(0, stats.loadSuccessCount());
36    assertEquals(0, stats.loadExceptionCount());
37    assertEquals(0.0, stats.loadExceptionRate());
38    assertEquals(0, stats.loadCount());
39    assertEquals(0, stats.totalLoadTime());
40    assertEquals(0.0, stats.averageLoadPenalty());
41    assertEquals(0, stats.evictionCount());
42  }
43
44  public void testSingle() {
45    CacheStats stats = new CacheStats(11, 13, 17, 19, 23, 27);
46    assertEquals(24, stats.requestCount());
47    assertEquals(11, stats.hitCount());
48    assertEquals(11.0/24, stats.hitRate());
49    assertEquals(13, stats.missCount());
50    assertEquals(13.0/24, stats.missRate());
51    assertEquals(17, stats.loadSuccessCount());
52    assertEquals(19, stats.loadExceptionCount());
53    assertEquals(19.0/36, stats.loadExceptionRate());
54    assertEquals(17 + 19, stats.loadCount());
55    assertEquals(23, stats.totalLoadTime());
56    assertEquals(23.0/(17 + 19), stats.averageLoadPenalty());
57    assertEquals(27, stats.evictionCount());
58  }
59
60  public void testMinus() {
61    CacheStats one = new CacheStats(11, 13, 17, 19, 23, 27);
62    CacheStats two = new CacheStats(53, 47, 43, 41, 37, 31);
63
64    CacheStats diff = two.minus(one);
65    assertEquals(76, diff.requestCount());
66    assertEquals(42, diff.hitCount());
67    assertEquals(42.0/76, diff.hitRate());
68    assertEquals(34, diff.missCount());
69    assertEquals(34.0/76, diff.missRate());
70    assertEquals(26, diff.loadSuccessCount());
71    assertEquals(22, diff.loadExceptionCount());
72    assertEquals(22.0/48, diff.loadExceptionRate());
73    assertEquals(26 + 22, diff.loadCount());
74    assertEquals(14, diff.totalLoadTime());
75    assertEquals(14.0/(26 + 22), diff.averageLoadPenalty());
76    assertEquals(4, diff.evictionCount());
77
78    assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two));
79  }
80
81  public void testPlus() {
82    CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9);
83    CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35);
84
85    CacheStats sum = two.plus(one);
86    assertEquals(124, sum.requestCount());
87    assertEquals(64, sum.hitCount());
88    assertEquals(64.0/124, sum.hitRate());
89    assertEquals(60, sum.missCount());
90    assertEquals(60.0/124, sum.missRate());
91    assertEquals(56, sum.loadSuccessCount());
92    assertEquals(52, sum.loadExceptionCount());
93    assertEquals(52.0/108, sum.loadExceptionRate());
94    assertEquals(56 + 52, sum.loadCount());
95    assertEquals(48, sum.totalLoadTime());
96    assertEquals(48.0/(56 + 52), sum.averageLoadPenalty());
97    assertEquals(44, sum.evictionCount());
98
99    assertEquals(sum, one.plus(two));
100  }
101}
102