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 17 package com.google.common.cache; 18 19 import com.google.common.cache.AbstractCache.SimpleStatsCounter; 20 import com.google.common.cache.AbstractCache.StatsCounter; 21 import com.google.common.collect.ImmutableList; 22 import com.google.common.collect.ImmutableMap; 23 import com.google.common.collect.Lists; 24 25 import junit.framework.TestCase; 26 27 import java.util.List; 28 import java.util.concurrent.atomic.AtomicReference; 29 30 /** 31 * Unit test for {@link AbstractCache}. 32 * 33 * @author Charles Fry 34 */ 35 public class AbstractCacheTest extends TestCase { 36 37 public void testGetIfPresent() { 38 final AtomicReference<Object> valueRef = new AtomicReference<Object>(); 39 Cache<Object, Object> cache = new AbstractCache<Object, Object>() { 40 @Override 41 public Object getIfPresent(Object key) { 42 return valueRef.get(); 43 } 44 }; 45 46 assertNull(cache.getIfPresent(new Object())); 47 48 Object newValue = new Object(); 49 valueRef.set(newValue); 50 assertSame(newValue, cache.getIfPresent(new Object())); 51 } 52 53 public void testGetAllPresent_empty() { 54 Cache<Object, Object> cache = new AbstractCache<Object, Object>() { 55 @Override 56 public Object getIfPresent(Object key) { 57 return null; 58 } 59 }; 60 61 assertEquals( 62 ImmutableMap.of(), 63 cache.getAllPresent(ImmutableList.of(new Object()))); 64 } 65 66 public void testGetAllPresent_cached() { 67 final Object cachedKey = new Object(); 68 final Object cachedValue = new Object(); 69 Cache<Object, Object> cache = new AbstractCache<Object, Object>() { 70 @Override 71 public Object getIfPresent(Object key) { 72 return cachedKey.equals(key) ? cachedValue : null; 73 } 74 }; 75 76 assertEquals( 77 ImmutableMap.of(cachedKey, cachedValue), 78 cache.getAllPresent(ImmutableList.of(cachedKey, new Object()))); 79 } 80 81 public void testInvalidateAll() { 82 final List<Object> invalidated = Lists.newArrayList(); 83 Cache<Integer, Integer> cache = new AbstractCache<Integer, Integer>() { 84 @Override 85 public Integer getIfPresent(Object key) { 86 throw new UnsupportedOperationException(); 87 } 88 89 @Override 90 public void invalidate(Object key) { 91 invalidated.add(key); 92 } 93 }; 94 95 List<Integer> toInvalidate = ImmutableList.of(1, 2, 3, 4); 96 cache.invalidateAll(toInvalidate); 97 assertEquals(toInvalidate, invalidated); 98 } 99 100 public void testEmptySimpleStats() { 101 StatsCounter counter = new SimpleStatsCounter(); 102 CacheStats stats = counter.snapshot(); 103 assertEquals(0, stats.requestCount()); 104 assertEquals(0, stats.hitCount()); 105 assertEquals(1.0, stats.hitRate()); 106 assertEquals(0, stats.missCount()); 107 assertEquals(0.0, stats.missRate()); 108 assertEquals(0, stats.loadSuccessCount()); 109 assertEquals(0, stats.loadExceptionCount()); 110 assertEquals(0, stats.loadCount()); 111 assertEquals(0, stats.totalLoadTime()); 112 assertEquals(0.0, stats.averageLoadPenalty()); 113 assertEquals(0, stats.evictionCount()); 114 } 115 116 public void testSingleSimpleStats() { 117 StatsCounter counter = new SimpleStatsCounter(); 118 for (int i = 0; i < 11; i++) { 119 counter.recordHits(1); 120 } 121 for (int i = 0; i < 13; i++) { 122 counter.recordLoadSuccess(i); 123 } 124 for (int i = 0; i < 17; i++) { 125 counter.recordLoadException(i); 126 } 127 for (int i = 0; i < 23; i++) { 128 counter.recordMisses(1); 129 } 130 for (int i = 0; i < 27; i++) { 131 counter.recordEviction(); 132 } 133 CacheStats stats = counter.snapshot(); 134 int requestCount = 11 + 23; 135 assertEquals(requestCount, stats.requestCount()); 136 assertEquals(11, stats.hitCount()); 137 assertEquals(11.0 / requestCount, stats.hitRate()); 138 int missCount = 23; 139 assertEquals(missCount, stats.missCount()); 140 assertEquals(((double) missCount) / requestCount, stats.missRate()); 141 assertEquals(13, stats.loadSuccessCount()); 142 assertEquals(17, stats.loadExceptionCount()); 143 assertEquals(13 + 17, stats.loadCount()); 144 assertEquals(214, stats.totalLoadTime()); 145 assertEquals(214.0 / (13 + 17), stats.averageLoadPenalty()); 146 assertEquals(27, stats.evictionCount()); 147 } 148 149 public void testSimpleStatsIncrementBy() { 150 long totalLoadTime = 0; 151 152 SimpleStatsCounter counter1 = new SimpleStatsCounter(); 153 for (int i = 0; i < 11; i++) { 154 counter1.recordHits(1); 155 } 156 for (int i = 0; i < 13; i++) { 157 counter1.recordLoadSuccess(i); 158 totalLoadTime += i; 159 } 160 for (int i = 0; i < 17; i++) { 161 counter1.recordLoadException(i); 162 totalLoadTime += i; 163 } 164 for (int i = 0; i < 19; i++) { 165 counter1.recordMisses(1); 166 } 167 for (int i = 0; i < 23; i++) { 168 counter1.recordEviction(); 169 } 170 171 SimpleStatsCounter counter2 = new SimpleStatsCounter(); 172 for (int i = 0; i < 27; i++) { 173 counter2.recordHits(1); 174 } 175 for (int i = 0; i < 31; i++) { 176 counter2.recordLoadSuccess(i); 177 totalLoadTime += i; 178 } 179 for (int i = 0; i < 37; i++) { 180 counter2.recordLoadException(i); 181 totalLoadTime += i; 182 } 183 for (int i = 0; i < 41; i++) { 184 counter2.recordMisses(1); 185 } 186 for (int i = 0; i < 43; i++) { 187 counter2.recordEviction(); 188 } 189 190 counter1.incrementBy(counter2); 191 assertEquals(new CacheStats(38, 60, 44, 54, totalLoadTime, 66), 192 counter1.snapshot()); 193 } 194 195 } 196
