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.Lists; 23 24 import junit.framework.TestCase; 25 26 import java.util.List; 27 import java.util.concurrent.ExecutionException; 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 testGetAllPresent() { 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 @Override 46 public Object get(Object key) throws ExecutionException { 47 throw new UnsupportedOperationException(); 48 } 49 50 }; 51 52 assertNull(cache.getIfPresent(new Object())); 53 54 Object newValue = new Object(); 55 valueRef.set(newValue); 56 assertSame(newValue, cache.getIfPresent(new Object())); 57 } 58 59 public void testInvalidateAll() { 60 final List<Object> invalidated = Lists.newArrayList(); 61 Cache<Integer, Integer> cache = new AbstractCache<Integer, Integer>() { 62 @Override 63 public Integer getIfPresent(Integer key) { 64 throw new UnsupportedOperationException(); 65 } 66 67 @Override 68 public Integer get(Integer key) throws ExecutionException { 69 throw new UnsupportedOperationException(); 70 } 71 72 @Override 73 public void invalidate(Object key) { 74 invalidated.add(key); 75 } 76 }; 77 78 List<Integer> toInvalidate = ImmutableList.of(1, 2, 3, 4); 79 cache.invalidateAll(toInvalidate); 80 assertEquals(toInvalidate, invalidated); 81 } 82 83 public void testEmptySimpleStats() { 84 StatsCounter counter = new SimpleStatsCounter(); 85 CacheStats stats = counter.snapshot(); 86 assertEquals(0, stats.requestCount()); 87 assertEquals(0, stats.hitCount()); 88 assertEquals(1.0, stats.hitRate()); 89 assertEquals(0, stats.missCount()); 90 assertEquals(0.0, stats.missRate()); 91 assertEquals(0, stats.loadSuccessCount()); 92 assertEquals(0, stats.loadExceptionCount()); 93 assertEquals(0, stats.loadCount()); 94 assertEquals(0, stats.totalLoadTime()); 95 assertEquals(0.0, stats.averageLoadPenalty()); 96 assertEquals(0, stats.evictionCount()); 97 } 98 99 public void testSingleSimpleStats() { 100 StatsCounter counter = new SimpleStatsCounter(); 101 for (int i = 0; i < 11; i++) { 102 counter.recordHits(1); 103 } 104 for (int i = 0; i < 13; i++) { 105 counter.recordLoadSuccess(i); 106 } 107 for (int i = 0; i < 17; i++) { 108 counter.recordLoadException(i); 109 } 110 for (int i = 0; i < 23; i++) { 111 counter.recordMisses(1); 112 } 113 for (int i = 0; i < 27; i++) { 114 counter.recordEviction(); 115 } 116 CacheStats stats = counter.snapshot(); 117 int requestCount = 11 + 23; 118 assertEquals(requestCount, stats.requestCount()); 119 assertEquals(11, stats.hitCount()); 120 assertEquals(11.0/requestCount, stats.hitRate()); 121 int missCount = 23; 122 assertEquals(missCount, stats.missCount()); 123 assertEquals(((double) missCount)/requestCount, stats.missRate()); 124 assertEquals(13, stats.loadSuccessCount()); 125 assertEquals(17, stats.loadExceptionCount()); 126 assertEquals(13 + 17, stats.loadCount()); 127 assertEquals(214, stats.totalLoadTime()); 128 assertEquals(214.0/(13 + 17), stats.averageLoadPenalty()); 129 assertEquals(27, stats.evictionCount()); 130 } 131 132 public void testSimpleStatsIncrementBy() { 133 long totalLoadTime = 0; 134 135 SimpleStatsCounter counter1 = new SimpleStatsCounter(); 136 for (int i = 0; i < 11; i++) { 137 counter1.recordHits(1); 138 } 139 for (int i = 0; i < 13; i++) { 140 counter1.recordLoadSuccess(i); 141 totalLoadTime += i; 142 } 143 for (int i = 0; i < 17; i++) { 144 counter1.recordLoadException(i); 145 totalLoadTime += i; 146 } 147 for (int i = 0; i < 19; i++) { 148 counter1.recordMisses(1); 149 } 150 for (int i = 0; i < 23; i++) { 151 counter1.recordEviction(); 152 } 153 154 SimpleStatsCounter counter2 = new SimpleStatsCounter(); 155 for (int i = 0; i < 27; i++) { 156 counter2.recordHits(1); 157 } 158 for (int i = 0; i < 31; i++) { 159 counter2.recordLoadSuccess(i); 160 totalLoadTime += i; 161 } 162 for (int i = 0; i < 37; i++) { 163 counter2.recordLoadException(i); 164 totalLoadTime += i; 165 } 166 for (int i = 0; i < 41; i++) { 167 counter2.recordMisses(1); 168 } 169 for (int i = 0; i < 43; i++) { 170 counter2.recordEviction(); 171 } 172 173 counter1.incrementBy(counter2); 174 assertEquals(new CacheStats(38, 60, 44, 54, totalLoadTime, 66), 175 counter1.snapshot()); 176 } 177 178 } 179
