Jamie Gennis | 1a20993 | 2011-04-28 16:19:45 -0700 | [diff] [blame^] | 1 | /* |
| 2 | ** Copyright 2011, The Android Open Source Project |
| 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 | #include <gtest/gtest.h> |
| 18 | |
| 19 | #include <utils/BlobCache.h> |
| 20 | |
| 21 | namespace android { |
| 22 | |
| 23 | class BlobCacheTest : public ::testing::Test { |
| 24 | protected: |
| 25 | enum { |
| 26 | MAX_KEY_SIZE = 6, |
| 27 | MAX_VALUE_SIZE = 8, |
| 28 | MAX_TOTAL_SIZE = 13, |
| 29 | }; |
| 30 | |
| 31 | virtual void SetUp() { |
| 32 | mBC = new BlobCache(MAX_KEY_SIZE, MAX_VALUE_SIZE, MAX_TOTAL_SIZE); |
| 33 | } |
| 34 | |
| 35 | virtual void TearDown() { |
| 36 | mBC.clear(); |
| 37 | } |
| 38 | |
| 39 | sp<BlobCache> mBC; |
| 40 | }; |
| 41 | |
| 42 | TEST_F(BlobCacheTest, CacheSingleValueSucceeds) { |
| 43 | char buf[4] = { 0xee, 0xee, 0xee, 0xee }; |
| 44 | mBC->set("abcd", 4, "efgh", 4); |
| 45 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4)); |
| 46 | ASSERT_EQ('e', buf[0]); |
| 47 | ASSERT_EQ('f', buf[1]); |
| 48 | ASSERT_EQ('g', buf[2]); |
| 49 | ASSERT_EQ('h', buf[3]); |
| 50 | } |
| 51 | |
| 52 | TEST_F(BlobCacheTest, CacheTwoValuesSucceeds) { |
| 53 | char buf[2] = { 0xee, 0xee }; |
| 54 | mBC->set("ab", 2, "cd", 2); |
| 55 | mBC->set("ef", 2, "gh", 2); |
| 56 | ASSERT_EQ(size_t(2), mBC->get("ab", 2, buf, 2)); |
| 57 | ASSERT_EQ('c', buf[0]); |
| 58 | ASSERT_EQ('d', buf[1]); |
| 59 | ASSERT_EQ(size_t(2), mBC->get("ef", 2, buf, 2)); |
| 60 | ASSERT_EQ('g', buf[0]); |
| 61 | ASSERT_EQ('h', buf[1]); |
| 62 | } |
| 63 | |
| 64 | TEST_F(BlobCacheTest, GetOnlyWritesInsideBounds) { |
| 65 | char buf[6] = { 0xee, 0xee, 0xee, 0xee, 0xee, 0xee }; |
| 66 | mBC->set("abcd", 4, "efgh", 4); |
| 67 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf+1, 4)); |
| 68 | ASSERT_EQ(0xee, buf[0]); |
| 69 | ASSERT_EQ('e', buf[1]); |
| 70 | ASSERT_EQ('f', buf[2]); |
| 71 | ASSERT_EQ('g', buf[3]); |
| 72 | ASSERT_EQ('h', buf[4]); |
| 73 | ASSERT_EQ(0xee, buf[5]); |
| 74 | } |
| 75 | |
| 76 | TEST_F(BlobCacheTest, GetOnlyWritesIfBufferIsLargeEnough) { |
| 77 | char buf[3] = { 0xee, 0xee, 0xee }; |
| 78 | mBC->set("abcd", 4, "efgh", 4); |
| 79 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 3)); |
| 80 | ASSERT_EQ(0xee, buf[0]); |
| 81 | ASSERT_EQ(0xee, buf[1]); |
| 82 | ASSERT_EQ(0xee, buf[2]); |
| 83 | } |
| 84 | |
| 85 | TEST_F(BlobCacheTest, GetDoesntAccessNullBuffer) { |
| 86 | mBC->set("abcd", 4, "efgh", 4); |
| 87 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, NULL, 0)); |
| 88 | } |
| 89 | |
| 90 | TEST_F(BlobCacheTest, MultipleSetsCacheLatestValue) { |
| 91 | char buf[4] = { 0xee, 0xee, 0xee, 0xee }; |
| 92 | mBC->set("abcd", 4, "efgh", 4); |
| 93 | mBC->set("abcd", 4, "ijkl", 4); |
| 94 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4)); |
| 95 | ASSERT_EQ('i', buf[0]); |
| 96 | ASSERT_EQ('j', buf[1]); |
| 97 | ASSERT_EQ('k', buf[2]); |
| 98 | ASSERT_EQ('l', buf[3]); |
| 99 | } |
| 100 | |
| 101 | TEST_F(BlobCacheTest, SecondSetKeepsFirstValueIfTooLarge) { |
| 102 | char buf[MAX_VALUE_SIZE+1] = { 0xee, 0xee, 0xee, 0xee }; |
| 103 | mBC->set("abcd", 4, "efgh", 4); |
| 104 | mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1); |
| 105 | ASSERT_EQ(size_t(4), mBC->get("abcd", 4, buf, 4)); |
| 106 | ASSERT_EQ('e', buf[0]); |
| 107 | ASSERT_EQ('f', buf[1]); |
| 108 | ASSERT_EQ('g', buf[2]); |
| 109 | ASSERT_EQ('h', buf[3]); |
| 110 | } |
| 111 | |
| 112 | TEST_F(BlobCacheTest, DoesntCacheIfKeyIsTooBig) { |
| 113 | char key[MAX_KEY_SIZE+1]; |
| 114 | char buf[4] = { 0xee, 0xee, 0xee, 0xee }; |
| 115 | for (int i = 0; i < MAX_KEY_SIZE+1; i++) { |
| 116 | key[i] = 'a'; |
| 117 | } |
| 118 | mBC->set(key, MAX_KEY_SIZE+1, "bbbb", 4); |
| 119 | ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE+1, buf, 4)); |
| 120 | ASSERT_EQ(0xee, buf[0]); |
| 121 | ASSERT_EQ(0xee, buf[1]); |
| 122 | ASSERT_EQ(0xee, buf[2]); |
| 123 | ASSERT_EQ(0xee, buf[3]); |
| 124 | } |
| 125 | |
| 126 | TEST_F(BlobCacheTest, DoesntCacheIfValueIsTooBig) { |
| 127 | char buf[MAX_VALUE_SIZE+1]; |
| 128 | for (int i = 0; i < MAX_VALUE_SIZE+1; i++) { |
| 129 | buf[i] = 'b'; |
| 130 | } |
| 131 | mBC->set("abcd", 4, buf, MAX_VALUE_SIZE+1); |
| 132 | for (int i = 0; i < MAX_VALUE_SIZE+1; i++) { |
| 133 | buf[i] = 0xee; |
| 134 | } |
| 135 | ASSERT_EQ(size_t(0), mBC->get("abcd", 4, buf, MAX_VALUE_SIZE+1)); |
| 136 | for (int i = 0; i < MAX_VALUE_SIZE+1; i++) { |
| 137 | SCOPED_TRACE(i); |
| 138 | ASSERT_EQ(0xee, buf[i]); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | TEST_F(BlobCacheTest, DoesntCacheIfKeyValuePairIsTooBig) { |
| 143 | // Check a testing assumptions |
| 144 | ASSERT_TRUE(MAX_TOTAL_SIZE < MAX_KEY_SIZE + MAX_VALUE_SIZE); |
| 145 | ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE); |
| 146 | |
| 147 | enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE + 1 }; |
| 148 | |
| 149 | char key[MAX_KEY_SIZE]; |
| 150 | char buf[bufSize]; |
| 151 | for (int i = 0; i < MAX_KEY_SIZE; i++) { |
| 152 | key[i] = 'a'; |
| 153 | } |
| 154 | for (int i = 0; i < bufSize; i++) { |
| 155 | buf[i] = 'b'; |
| 156 | } |
| 157 | |
| 158 | mBC->set(key, MAX_KEY_SIZE, buf, MAX_VALUE_SIZE); |
| 159 | ASSERT_EQ(size_t(0), mBC->get(key, MAX_KEY_SIZE, NULL, 0)); |
| 160 | } |
| 161 | |
| 162 | TEST_F(BlobCacheTest, CacheMaxKeySizeSucceeds) { |
| 163 | char key[MAX_KEY_SIZE]; |
| 164 | char buf[4] = { 0xee, 0xee, 0xee, 0xee }; |
| 165 | for (int i = 0; i < MAX_KEY_SIZE; i++) { |
| 166 | key[i] = 'a'; |
| 167 | } |
| 168 | mBC->set(key, MAX_KEY_SIZE, "wxyz", 4); |
| 169 | ASSERT_EQ(size_t(4), mBC->get(key, MAX_KEY_SIZE, buf, 4)); |
| 170 | ASSERT_EQ('w', buf[0]); |
| 171 | ASSERT_EQ('x', buf[1]); |
| 172 | ASSERT_EQ('y', buf[2]); |
| 173 | ASSERT_EQ('z', buf[3]); |
| 174 | } |
| 175 | |
| 176 | TEST_F(BlobCacheTest, CacheMaxValueSizeSucceeds) { |
| 177 | char buf[MAX_VALUE_SIZE]; |
| 178 | for (int i = 0; i < MAX_VALUE_SIZE; i++) { |
| 179 | buf[i] = 'b'; |
| 180 | } |
| 181 | mBC->set("abcd", 4, buf, MAX_VALUE_SIZE); |
| 182 | for (int i = 0; i < MAX_VALUE_SIZE; i++) { |
| 183 | buf[i] = 0xee; |
| 184 | } |
| 185 | ASSERT_EQ(size_t(MAX_VALUE_SIZE), mBC->get("abcd", 4, buf, |
| 186 | MAX_VALUE_SIZE)); |
| 187 | for (int i = 0; i < MAX_VALUE_SIZE; i++) { |
| 188 | SCOPED_TRACE(i); |
| 189 | ASSERT_EQ('b', buf[i]); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | TEST_F(BlobCacheTest, CacheMaxKeyValuePairSizeSucceeds) { |
| 194 | // Check a testing assumption |
| 195 | ASSERT_TRUE(MAX_KEY_SIZE < MAX_TOTAL_SIZE); |
| 196 | |
| 197 | enum { bufSize = MAX_TOTAL_SIZE - MAX_KEY_SIZE }; |
| 198 | |
| 199 | char key[MAX_KEY_SIZE]; |
| 200 | char buf[bufSize]; |
| 201 | for (int i = 0; i < MAX_KEY_SIZE; i++) { |
| 202 | key[i] = 'a'; |
| 203 | } |
| 204 | for (int i = 0; i < bufSize; i++) { |
| 205 | buf[i] = 'b'; |
| 206 | } |
| 207 | |
| 208 | mBC->set(key, MAX_KEY_SIZE, buf, bufSize); |
| 209 | ASSERT_EQ(size_t(bufSize), mBC->get(key, MAX_KEY_SIZE, NULL, 0)); |
| 210 | } |
| 211 | |
| 212 | TEST_F(BlobCacheTest, CacheMinKeyAndValueSizeSucceeds) { |
| 213 | char buf[1] = { 0xee }; |
| 214 | mBC->set("x", 1, "y", 1); |
| 215 | ASSERT_EQ(size_t(1), mBC->get("x", 1, buf, 1)); |
| 216 | ASSERT_EQ('y', buf[0]); |
| 217 | } |
| 218 | |
| 219 | TEST_F(BlobCacheTest, CacheSizeDoesntExceedTotalLimit) { |
| 220 | for (int i = 0; i < 256; i++) { |
| 221 | uint8_t k = i; |
| 222 | mBC->set(&k, 1, "x", 1); |
| 223 | } |
| 224 | int numCached = 0; |
| 225 | for (int i = 0; i < 256; i++) { |
| 226 | uint8_t k = i; |
| 227 | if (mBC->get(&k, 1, NULL, 0) == 1) { |
| 228 | numCached++; |
| 229 | } |
| 230 | } |
| 231 | ASSERT_GE(MAX_TOTAL_SIZE / 2, numCached); |
| 232 | } |
| 233 | |
| 234 | TEST_F(BlobCacheTest, ExceedingTotalLimitHalvesCacheSize) { |
| 235 | // Fill up the entire cache with 1 char key/value pairs. |
| 236 | const int maxEntries = MAX_TOTAL_SIZE / 2; |
| 237 | for (int i = 0; i < maxEntries; i++) { |
| 238 | uint8_t k = i; |
| 239 | mBC->set(&k, 1, "x", 1); |
| 240 | } |
| 241 | // Insert one more entry, causing a cache overflow. |
| 242 | { |
| 243 | uint8_t k = maxEntries; |
| 244 | mBC->set(&k, 1, "x", 1); |
| 245 | } |
| 246 | // Count the number of entries in the cache. |
| 247 | int numCached = 0; |
| 248 | for (int i = 0; i < maxEntries+1; i++) { |
| 249 | uint8_t k = i; |
| 250 | if (mBC->get(&k, 1, NULL, 0) == 1) { |
| 251 | numCached++; |
| 252 | } |
| 253 | } |
| 254 | ASSERT_EQ(maxEntries/2 + 1, numCached); |
| 255 | } |
| 256 | |
| 257 | } // namespace android |