tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php

   1 <?php
   2
   3 use Wikimedia\TestingAccessWrapper;
   4
   5 class WANObjectCacheTest extends PHPUnit_Framework_TestCase  {
   6         /** @var WANObjectCache */
   7         private $cache;
   8         /**@var BagOStuff */
   9         private $internalCache;
  10
  11         protected function setUp() {
  12                 parent::setUp();
  13
  14                 $this->cache = new WANObjectCache( [
  15                         'cache' => new HashBagOStuff(),
  16                         'pool' => 'testcache-hash',
  17                         'relayer' => new EventRelayerNull( [] )
  18                 ] );
  19
  20                 $wanCache = TestingAccessWrapper::newFromObject( $this->cache );
  21                 /** @noinspection PhpUndefinedFieldInspection */
  22                 $this->internalCache = $wanCache->cache;
  23         }
  24
  25         /**
  26          * @dataProvider provideSetAndGet
  27          * @covers WANObjectCache::set()
  28          * @covers WANObjectCache::get()
  29          * @covers WANObjectCache::makeKey()
  30          * @param mixed $value
  31          * @param integer $ttl
  32          */
  33         public function testSetAndGet( $value, $ttl ) {
  34                 $curTTL = null;
  35                 $asOf = null;
  36                 $key = $this->cache->makeKey( 'x', wfRandomString() );
  37
  38                 $this->cache->get( $key, $curTTL, [], $asOf );
  39                 $this->assertNull( $curTTL, "Current TTL is null" );
  40                 $this->assertNull( $asOf, "Current as-of-time is infinite" );
  41
  42                 $t = microtime( true );
  43                 $this->cache->set( $key, $value, $ttl );
  44
  45                 $this->assertEquals( $value, $this->cache->get( $key, $curTTL, [], $asOf ) );
  46                 if ( is_infinite( $ttl ) || $ttl == 0 ) {
  47                         $this->assertTrue( is_infinite( $curTTL ), "Current TTL is infinite" );
  48                 } else {
  49                         $this->assertGreaterThan( 0, $curTTL, "Current TTL > 0" );
  50                         $this->assertLessThanOrEqual( $ttl, $curTTL, "Current TTL < nominal TTL" );
  51                 }
  52                 $this->assertGreaterThanOrEqual( $t - 1, $asOf, "As-of-time in range of set() time" );
  53                 $this->assertLessThanOrEqual( $t + 1, $asOf, "As-of-time in range of set() time" );
  54         }
  55
  56         public static function provideSetAndGet() {
  57                 return [
  58                         [ 14141, 3 ],
  59                         [ 3535.666, 3 ],
  60                         [ [], 3 ],
  61                         [ null, 3 ],
  62                         [ '0', 3 ],
  63                         [ (object)[ 'meow' ], 3 ],
  64                         [ INF, 3 ],
  65                         [ '', 3 ],
  66                         [ 'pizzacat', INF ],
  67                 ];
  68         }
  69
  70         /**
  71          * @covers WANObjectCache::get()
  72          * @covers WANObjectCache::makeGlobalKey()
  73          */
  74         public function testGetNotExists() {
  75                 $key = $this->cache->makeGlobalKey( 'y', wfRandomString(), 'p' );
  76                 $curTTL = null;
  77                 $value = $this->cache->get( $key, $curTTL );
  78
  79                 $this->assertFalse( $value, "Non-existing key has false value" );
  80                 $this->assertNull( $curTTL, "Non-existing key has null current TTL" );
  81         }
  82
  83         /**
  84          * @covers WANObjectCache::set()
  85          */
  86         public function testSetOver() {
  87                 $key = wfRandomString();
  88                 for ( $i = 0; $i < 3; ++$i ) {
  89                         $value = wfRandomString();
  90                         $this->cache->set( $key, $value, 3 );
  91
  92                         $this->assertEquals( $this->cache->get( $key ), $value );
  93                 }
  94         }
  95
  96         /**
  97          * @covers WANObjectCache::set()
  98          */
  99         public function testStaleSet() {
 100                 $key = wfRandomString();
 101                 $value = wfRandomString();
 102                 $this->cache->set( $key, $value, 3, [ 'since' => microtime( true ) - 30 ] );
 103
 104                 $this->assertFalse( $this->cache->get( $key ), "Stale set() value ignored" );
 105         }
 106
 107         public function testProcessCache() {
 108                 $hit = 0;
 109                 $callback = function () use ( &$hit ) {
 110                         ++$hit;
 111                         return 42;
 112                 };
 113                 $keys = [ wfRandomString(), wfRandomString(), wfRandomString() ];
 114                 $groups = [ 'thiscache:1', 'thatcache:1', 'somecache:1' ];
 115
 116                 foreach ( $keys as $i => $key ) {
 117                         $this->cache->getWithSetCallback(
 118                                 $key, 100, $callback, [ 'pcTTL' => 5, 'pcGroup' => $groups[$i] ] );
 119                 }
 120                 $this->assertEquals( 3, $hit );
 121
 122                 foreach ( $keys as $i => $key ) {
 123                         $this->cache->getWithSetCallback(
 124                                 $key, 100, $callback, [ 'pcTTL' => 5, 'pcGroup' => $groups[$i] ] );
 125                 }
 126                 $this->assertEquals( 3, $hit, "Values cached" );
 127
 128                 foreach ( $keys as $i => $key ) {
 129                         $this->cache->getWithSetCallback(
 130                                 "$key-2", 100, $callback, [ 'pcTTL' => 5, 'pcGroup' => $groups[$i] ] );
 131                 }
 132                 $this->assertEquals( 6, $hit );
 133
 134                 foreach ( $keys as $i => $key ) {
 135                         $this->cache->getWithSetCallback(
 136                                 "$key-2", 100, $callback, [ 'pcTTL' => 5, 'pcGroup' => $groups[$i] ] );
 137                 }
 138                 $this->assertEquals( 6, $hit, "New values cached" );
 139
 140                 foreach ( $keys as $i => $key ) {
 141                         $this->cache->delete( $key );
 142                         $this->cache->getWithSetCallback(
 143                                 $key, 100, $callback, [ 'pcTTL' => 5, 'pcGroup' => $groups[$i] ] );
 144                 }
 145                 $this->assertEquals( 9, $hit, "Values evicted" );
 146
 147                 $key = reset( $keys );
 148                 // Get into cache
 149                 $this->cache->getWithSetCallback( $key, 100, $callback, [ 'pcTTL' => 5 ] );
 150                 $this->cache->getWithSetCallback( $key, 100, $callback, [ 'pcTTL' => 5 ] );
 151                 $this->assertEquals( 10, $hit, "Value cached" );
 152                 $outerCallback = function () use ( &$callback, $key ) {
 153                         $v = $this->cache->getWithSetCallback( $key, 100, $callback, [ 'pcTTL' => 5 ] );
 154
 155                         return 43 + $v;
 156                 };
 157                 $this->cache->getWithSetCallback( $key, 100, $outerCallback );
 158                 $this->assertEquals( 11, $hit, "Nested callback value process cache skipped" );
 159         }
 160
 161         /**
 162          * @dataProvider getWithSetCallback_provider
 163          * @covers WANObjectCache::getWithSetCallback()
 164          * @covers WANObjectCache::doGetWithSetCallback()
 165          * @param array $extOpts
 166          * @param bool $versioned
 167          */
 168         public function testGetWithSetCallback( array $extOpts, $versioned ) {
 169                 $cache = $this->cache;
 170
 171                 $key = wfRandomString();
 172                 $value = wfRandomString();
 173                 $cKey1 = wfRandomString();
 174                 $cKey2 = wfRandomString();
 175
 176                 $priorValue = null;
 177                 $priorAsOf = null;
 178                 $wasSet = 0;
 179                 $func = function( $old, &$ttl, &$opts, $asOf )
 180                 use ( &$wasSet, &$priorValue, &$priorAsOf, $value )
 181                 {
 182                         ++$wasSet;
 183                         $priorValue = $old;
 184                         $priorAsOf = $asOf;
 185                         $ttl = 20; // override with another value
 186                         return $value;
 187                 };
 188
 189                 $wasSet = 0;
 190                 $v = $cache->getWithSetCallback( $key, 30, $func, [ 'lockTSE' => 5 ] + $extOpts );
 191                 $this->assertEquals( $value, $v, "Value returned" );
 192                 $this->assertEquals( 1, $wasSet, "Value regenerated" );
 193                 $this->assertFalse( $priorValue, "No prior value" );
 194                 $this->assertNull( $priorAsOf, "No prior value" );
 195
 196                 $curTTL = null;
 197                 $cache->get( $key, $curTTL );
 198                 $this->assertLessThanOrEqual( 20, $curTTL, 'Current TTL between 19-20 (overriden)' );
 199                 $this->assertGreaterThanOrEqual( 19, $curTTL, 'Current TTL between 19-20 (overriden)' );
 200
 201                 $wasSet = 0;
 202                 $v = $cache->getWithSetCallback( $key, 30, $func, [
 203                                 'lowTTL' => 0,
 204                                 'lockTSE' => 5,
 205                         ] + $extOpts );
 206                 $this->assertEquals( $value, $v, "Value returned" );
 207                 $this->assertEquals( 0, $wasSet, "Value not regenerated" );
 208
 209                 $priorTime = microtime( true );
 210                 usleep( 1 );
 211                 $wasSet = 0;
 212                 $v = $cache->getWithSetCallback(
 213                         $key, 30, $func, [ 'checkKeys' => [ $cKey1, $cKey2 ] ] + $extOpts
 214                 );
 215                 $this->assertEquals( $value, $v, "Value returned" );
 216                 $this->assertEquals( 1, $wasSet, "Value regenerated due to check keys" );
 217                 $this->assertEquals( $value, $priorValue, "Has prior value" );
 218                 $this->assertInternalType( 'float', $priorAsOf, "Has prior value" );
 219                 $t1 = $cache->getCheckKeyTime( $cKey1 );
 220                 $this->assertGreaterThanOrEqual( $priorTime, $t1, 'Check keys generated on miss' );
 221                 $t2 = $cache->getCheckKeyTime( $cKey2 );
 222                 $this->assertGreaterThanOrEqual( $priorTime, $t2, 'Check keys generated on miss' );
 223
 224                 $priorTime = microtime( true );
 225                 $wasSet = 0;
 226                 $v = $cache->getWithSetCallback(
 227                         $key, 30, $func, [ 'checkKeys' => [ $cKey1, $cKey2 ] ] + $extOpts
 228                 );
 229                 $this->assertEquals( $value, $v, "Value returned" );
 230                 $this->assertEquals( 1, $wasSet, "Value regenerated due to still-recent check keys" );
 231                 $t1 = $cache->getCheckKeyTime( $cKey1 );
 232                 $this->assertLessThanOrEqual( $priorTime, $t1, 'Check keys did not change again' );
 233                 $t2 = $cache->getCheckKeyTime( $cKey2 );
 234                 $this->assertLessThanOrEqual( $priorTime, $t2, 'Check keys did not change again' );
 235
 236                 $curTTL = null;
 237                 $v = $cache->get( $key, $curTTL, [ $cKey1, $cKey2 ] );
 238                 if ( $versioned ) {
 239                         $this->assertEquals( $value, $v[$cache::VFLD_DATA], "Value returned" );
 240                 } else {
 241                         $this->assertEquals( $value, $v, "Value returned" );
 242                 }
 243                 $this->assertLessThanOrEqual( 0, $curTTL, "Value has current TTL < 0 due to check keys" );
 244
 245                 $wasSet = 0;
 246                 $key = wfRandomString();
 247                 $v = $cache->getWithSetCallback( $key, 30, $func, [ 'pcTTL' => 5 ] + $extOpts );
 248                 $this->assertEquals( $value, $v, "Value returned" );
 249                 $cache->delete( $key );
 250                 $v = $cache->getWithSetCallback( $key, 30, $func, [ 'pcTTL' => 5 ] + $extOpts );
 251                 $this->assertEquals( $value, $v, "Value still returned after deleted" );
 252                 $this->assertEquals( 1, $wasSet, "Value process cached while deleted" );
 253         }
 254
 255         public static function getWithSetCallback_provider() {
 256                 return [
 257                         [ [], false ],
 258                         [ [ 'version' => 1 ], true ]
 259                 ];
 260         }
 261
 262         /**
 263          * @dataProvider getMultiWithSetCallback_provider
 264          * @covers WANObjectCache::getMultiWithSetCallback()
 265          * @covers WANObjectCache::makeMultiKeys()
 266          * @param array $extOpts
 267          * @param bool $versioned
 268          */
 269         public function testGetMultiWithSetCallback( array $extOpts, $versioned ) {
 270                 $cache = $this->cache;
 271
 272                 $keyA = wfRandomString();
 273                 $keyB = wfRandomString();
 274                 $keyC = wfRandomString();
 275                 $cKey1 = wfRandomString();
 276                 $cKey2 = wfRandomString();
 277
 278                 $priorValue = null;
 279                 $priorAsOf = null;
 280                 $wasSet = 0;
 281                 $genFunc = function ( $id, $old, &$ttl, &$opts, $asOf ) use (
 282                         &$wasSet, &$priorValue, &$priorAsOf
 283                 ) {
 284                         ++$wasSet;
 285                         $priorValue = $old;
 286                         $priorAsOf = $asOf;
 287                         $ttl = 20; // override with another value
 288                         return "@$id$";
 289                 };
 290
 291                 $wasSet = 0;
 292                 $keyedIds = new ArrayIterator( [ $keyA => 3353 ] );
 293                 $value = "@3353$";
 294                 $v = $cache->getMultiWithSetCallback(
 295                         $keyedIds, 30, $genFunc, [ 'lockTSE' => 5 ] + $extOpts );
 296                 $this->assertEquals( $value, $v[$keyA], "Value returned" );
 297                 $this->assertEquals( 1, $wasSet, "Value regenerated" );
 298                 $this->assertFalse( $priorValue, "No prior value" );
 299                 $this->assertNull( $priorAsOf, "No prior value" );
 300
 301                 $curTTL = null;
 302                 $cache->get( $keyA, $curTTL );
 303                 $this->assertLessThanOrEqual( 20, $curTTL, 'Current TTL between 19-20 (overriden)' );
 304                 $this->assertGreaterThanOrEqual( 19, $curTTL, 'Current TTL between 19-20 (overriden)' );
 305
 306                 $wasSet = 0;
 307                 $value = "@efef$";
 308                 $keyedIds = new ArrayIterator( [ $keyB => 'efef' ] );
 309                 $v = $cache->getMultiWithSetCallback(
 310                         $keyedIds, 30, $genFunc, [ 'lowTTL' => 0, 'lockTSE' => 5, ] + $extOpts );
 311                 $this->assertEquals( $value, $v[$keyB], "Value returned" );
 312                 $this->assertEquals( 1, $wasSet, "Value regenerated" );
 313                 $v = $cache->getMultiWithSetCallback(
 314                         $keyedIds, 30, $genFunc, [ 'lowTTL' => 0, 'lockTSE' => 5, ] + $extOpts );
 315                 $this->assertEquals( $value, $v[$keyB], "Value returned" );
 316                 $this->assertEquals( 1, $wasSet, "Value not regenerated" );
 317
 318                 $priorTime = microtime( true );
 319                 usleep( 1 );
 320                 $wasSet = 0;
 321                 $keyedIds = new ArrayIterator( [ $keyB => 'efef' ] );
 322                 $v = $cache->getMultiWithSetCallback(
 323                         $keyedIds, 30, $genFunc, [ 'checkKeys' => [ $cKey1, $cKey2 ] ] + $extOpts
 324                 );
 325                 $this->assertEquals( $value, $v[$keyB], "Value returned" );
 326                 $this->assertEquals( 1, $wasSet, "Value regenerated due to check keys" );
 327                 $this->assertEquals( $value, $priorValue, "Has prior value" );
 328                 $this->assertInternalType( 'float', $priorAsOf, "Has prior value" );
 329                 $t1 = $cache->getCheckKeyTime( $cKey1 );
 330                 $this->assertGreaterThanOrEqual( $priorTime, $t1, 'Check keys generated on miss' );
 331                 $t2 = $cache->getCheckKeyTime( $cKey2 );
 332                 $this->assertGreaterThanOrEqual( $priorTime, $t2, 'Check keys generated on miss' );
 333
 334                 $priorTime = microtime( true );
 335                 $value = "@43636$";
 336                 $wasSet = 0;
 337                 $keyedIds = new ArrayIterator( [ $keyC => 43636 ] );
 338                 $v = $cache->getMultiWithSetCallback(
 339                         $keyedIds, 30, $genFunc, [ 'checkKeys' => [ $cKey1, $cKey2 ] ] + $extOpts
 340                 );
 341                 $this->assertEquals( $value, $v[$keyC], "Value returned" );
 342                 $this->assertEquals( 1, $wasSet, "Value regenerated due to still-recent check keys" );
 343                 $t1 = $cache->getCheckKeyTime( $cKey1 );
 344                 $this->assertLessThanOrEqual( $priorTime, $t1, 'Check keys did not change again' );
 345                 $t2 = $cache->getCheckKeyTime( $cKey2 );
 346                 $this->assertLessThanOrEqual( $priorTime, $t2, 'Check keys did not change again' );
 347
 348                 $curTTL = null;
 349                 $v = $cache->get( $keyC, $curTTL, [ $cKey1, $cKey2 ] );
 350                 if ( $versioned ) {
 351                         $this->assertEquals( $value, $v[$cache::VFLD_DATA], "Value returned" );
 352                 } else {
 353                         $this->assertEquals( $value, $v, "Value returned" );
 354                 }
 355                 $this->assertLessThanOrEqual( 0, $curTTL, "Value has current TTL < 0 due to check keys" );
 356
 357                 $wasSet = 0;
 358                 $key = wfRandomString();
 359                 $keyedIds = new ArrayIterator( [ $key => 242424 ] );
 360                 $v = $cache->getMultiWithSetCallback(
 361                         $keyedIds, 30, $genFunc, [ 'pcTTL' => 5 ] + $extOpts );
 362                 $this->assertEquals( "@{$keyedIds[$key]}$", $v[$key], "Value returned" );
 363                 $cache->delete( $key );
 364                 $keyedIds = new ArrayIterator( [ $key => 242424 ] );
 365                 $v = $cache->getMultiWithSetCallback(
 366                         $keyedIds, 30, $genFunc, [ 'pcTTL' => 5 ] + $extOpts );
 367                 $this->assertEquals( "@{$keyedIds[$key]}$", $v[$key], "Value still returned after deleted" );
 368                 $this->assertEquals( 1, $wasSet, "Value process cached while deleted" );
 369
 370                 $calls = 0;
 371                 $ids = [ 1, 2, 3, 4, 5, 6 ];
 372                 $keyFunc = function ( $id, WANObjectCache $wanCache ) {
 373                         return $wanCache->makeKey( 'test', $id );
 374                 };
 375                 $keyedIds = $cache->makeMultiKeys( $ids, $keyFunc );
 376                 $genFunc = function ( $id, $oldValue, &$ttl, array &$setops ) use ( &$calls ) {
 377                         ++$calls;
 378
 379                         return "val-{$id}";
 380                 };
 381                 $values = $cache->getMultiWithSetCallback( $keyedIds, 10, $genFunc );
 382
 383                 $this->assertEquals(
 384                         [ "val-1", "val-2", "val-3", "val-4", "val-5", "val-6" ],
 385                         array_values( $values ),
 386                         "Correct values in correct order"
 387                 );
 388                 $this->assertEquals(
 389                         array_map( $keyFunc, $ids, array_fill( 0, count( $ids ), $this->cache ) ),
 390                         array_keys( $values ),
 391                         "Correct keys in correct order"
 392                 );
 393                 $this->assertEquals( count( $ids ), $calls );
 394
 395                 $cache->getMultiWithSetCallback( $keyedIds, 10, $genFunc );
 396                 $this->assertEquals( count( $ids ), $calls, "Values cached" );
 397         }
 398
 399         public static function getMultiWithSetCallback_provider() {
 400                 return [
 401                         [ [], false ],
 402                         [ [ 'version' => 1 ], true ]
 403                 ];
 404         }
 405
 406         /**
 407          * @covers WANObjectCache::getWithSetCallback()
 408          * @covers WANObjectCache::doGetWithSetCallback()
 409          */
 410         public function testLockTSE() {
 411                 $cache = $this->cache;
 412                 $key = wfRandomString();
 413                 $value = wfRandomString();
 414
 415                 $calls = 0;
 416                 $func = function() use ( &$calls, $value, $cache, $key ) {
 417                         ++$calls;
 418                         // Immediately kill any mutex rather than waiting a second
 419                         $cache->delete( $cache::MUTEX_KEY_PREFIX . $key );
 420                         return $value;
 421                 };
 422
 423                 $ret = $cache->getWithSetCallback( $key, 30, $func, [ 'lockTSE' => 5 ] );
 424                 $this->assertEquals( $value, $ret );
 425                 $this->assertEquals( 1, $calls, 'Value was populated' );
 426
 427                 // Acquire a lock to verify that getWithSetCallback uses lockTSE properly
 428                 $this->internalCache->add( $cache::MUTEX_KEY_PREFIX . $key, 1, 0 );
 429
 430                 $checkKeys = [ wfRandomString() ]; // new check keys => force misses
 431                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 432                         [ 'lockTSE' => 5, 'checkKeys' => $checkKeys ] );
 433                 $this->assertEquals( $value, $ret, 'Old value used' );
 434                 $this->assertEquals( 1, $calls, 'Callback was not used' );
 435
 436                 $cache->delete( $key );
 437                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 438                         [ 'lockTSE' => 5, 'checkKeys' => $checkKeys ] );
 439                 $this->assertEquals( $value, $ret, 'Callback was used; interim saved' );
 440                 $this->assertEquals( 2, $calls, 'Callback was used; interim saved' );
 441
 442                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 443                         [ 'lockTSE' => 5, 'checkKeys' => $checkKeys ] );
 444                 $this->assertEquals( $value, $ret, 'Callback was not used; used interim' );
 445                 $this->assertEquals( 2, $calls, 'Callback was not used; used interim' );
 446         }
 447
 448         /**
 449          * @covers WANObjectCache::getWithSetCallback()
 450          * @covers WANObjectCache::doGetWithSetCallback()
 451          */
 452         public function testLockTSESlow() {
 453                 $cache = $this->cache;
 454                 $key = wfRandomString();
 455                 $value = wfRandomString();
 456
 457                 $calls = 0;
 458                 $func = function( $oldValue, &$ttl, &$setOpts ) use ( &$calls, $value, $cache, $key ) {
 459                         ++$calls;
 460                         $setOpts['since'] = microtime( true ) - 10;
 461                         // Immediately kill any mutex rather than waiting a second
 462                         $cache->delete( $cache::MUTEX_KEY_PREFIX . $key );
 463                         return $value;
 464                 };
 465
 466                 // Value should be marked as stale due to snapshot lag
 467                 $curTTL = null;
 468                 $ret = $cache->getWithSetCallback( $key, 30, $func, [ 'lockTSE' => 5 ] );
 469                 $this->assertEquals( $value, $ret );
 470                 $this->assertEquals( $value, $cache->get( $key, $curTTL ), 'Value was populated' );
 471                 $this->assertLessThan( 0, $curTTL, 'Value has negative curTTL' );
 472                 $this->assertEquals( 1, $calls, 'Value was generated' );
 473
 474                 // Acquire a lock to verify that getWithSetCallback uses lockTSE properly
 475                 $this->internalCache->add( $cache::MUTEX_KEY_PREFIX . $key, 1, 0 );
 476                 $ret = $cache->getWithSetCallback( $key, 30, $func, [ 'lockTSE' => 5 ] );
 477                 $this->assertEquals( $value, $ret );
 478                 $this->assertEquals( 1, $calls, 'Callback was not used' );
 479         }
 480
 481         /**
 482          * @covers WANObjectCache::getWithSetCallback()
 483          * @covers WANObjectCache::doGetWithSetCallback()
 484          */
 485         public function testBusyValue() {
 486                 $cache = $this->cache;
 487                 $key = wfRandomString();
 488                 $value = wfRandomString();
 489                 $busyValue = wfRandomString();
 490
 491                 $calls = 0;
 492                 $func = function() use ( &$calls, $value, $cache, $key ) {
 493                         ++$calls;
 494                         // Immediately kill any mutex rather than waiting a second
 495                         $cache->delete( $cache::MUTEX_KEY_PREFIX . $key );
 496                         return $value;
 497                 };
 498
 499                 $ret = $cache->getWithSetCallback( $key, 30, $func, [ 'busyValue' => $busyValue ] );
 500                 $this->assertEquals( $value, $ret );
 501                 $this->assertEquals( 1, $calls, 'Value was populated' );
 502
 503                 // Acquire a lock to verify that getWithSetCallback uses busyValue properly
 504                 $this->internalCache->add( $cache::MUTEX_KEY_PREFIX . $key, 1, 0 );
 505
 506                 $checkKeys = [ wfRandomString() ]; // new check keys => force misses
 507                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 508                         [ 'busyValue' => $busyValue, 'checkKeys' => $checkKeys ] );
 509                 $this->assertEquals( $value, $ret, 'Callback used' );
 510                 $this->assertEquals( 2, $calls, 'Callback used' );
 511
 512                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 513                         [ 'lockTSE' => 30, 'busyValue' => $busyValue, 'checkKeys' => $checkKeys ] );
 514                 $this->assertEquals( $value, $ret, 'Old value used' );
 515                 $this->assertEquals( 2, $calls, 'Callback was not used' );
 516
 517                 $cache->delete( $key ); // no value at all anymore and still locked
 518                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 519                         [ 'busyValue' => $busyValue, 'checkKeys' => $checkKeys ] );
 520                 $this->assertEquals( $busyValue, $ret, 'Callback was not used; used busy value' );
 521                 $this->assertEquals( 2, $calls, 'Callback was not used; used busy value' );
 522
 523                 $this->internalCache->delete( $cache::MUTEX_KEY_PREFIX . $key );
 524                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 525                         [ 'lockTSE' => 30, 'busyValue' => $busyValue, 'checkKeys' => $checkKeys ] );
 526                 $this->assertEquals( $value, $ret, 'Callback was used; saved interim' );
 527                 $this->assertEquals( 3, $calls, 'Callback was used; saved interim' );
 528
 529                 $this->internalCache->add( $cache::MUTEX_KEY_PREFIX . $key, 1, 0 );
 530                 $ret = $cache->getWithSetCallback( $key, 30, $func,
 531                         [ 'busyValue' => $busyValue, 'checkKeys' => $checkKeys ] );
 532                 $this->assertEquals( $value, $ret, 'Callback was not used; used interim' );
 533                 $this->assertEquals( 3, $calls, 'Callback was not used; used interim' );
 534         }
 535
 536         /**
 537          * @covers WANObjectCache::getMulti()
 538          */
 539         public function testGetMulti() {
 540                 $cache = $this->cache;
 541
 542                 $value1 = [ 'this' => 'is', 'a' => 'test' ];
 543                 $value2 = [ 'this' => 'is', 'another' => 'test' ];
 544
 545                 $key1 = wfRandomString();
 546                 $key2 = wfRandomString();
 547                 $key3 = wfRandomString();
 548
 549                 $cache->set( $key1, $value1, 5 );
 550                 $cache->set( $key2, $value2, 10 );
 551
 552                 $curTTLs = [];
 553                 $this->assertEquals(
 554                         [ $key1 => $value1, $key2 => $value2 ],
 555                         $cache->getMulti( [ $key1, $key2, $key3 ], $curTTLs ),
 556                         'Result array populated'
 557                 );
 558
 559                 $this->assertEquals( 2, count( $curTTLs ), "Two current TTLs in array" );
 560                 $this->assertGreaterThan( 0, $curTTLs[$key1], "Key 1 has current TTL > 0" );
 561                 $this->assertGreaterThan( 0, $curTTLs[$key2], "Key 2 has current TTL > 0" );
 562
 563                 $cKey1 = wfRandomString();
 564                 $cKey2 = wfRandomString();
 565
 566                 $priorTime = microtime( true );
 567                 usleep( 1 );
 568                 $curTTLs = [];
 569                 $this->assertEquals(
 570                         [ $key1 => $value1, $key2 => $value2 ],
 571                         $cache->getMulti( [ $key1, $key2, $key3 ], $curTTLs, [ $cKey1, $cKey2 ] ),
 572                         "Result array populated even with new check keys"
 573                 );
 574                 $t1 = $cache->getCheckKeyTime( $cKey1 );
 575                 $this->assertGreaterThanOrEqual( $priorTime, $t1, 'Check key 1 generated on miss' );
 576                 $t2 = $cache->getCheckKeyTime( $cKey2 );
 577                 $this->assertGreaterThanOrEqual( $priorTime, $t2, 'Check key 2 generated on miss' );
 578                 $this->assertEquals( 2, count( $curTTLs ), "Current TTLs array set" );
 579                 $this->assertLessThanOrEqual( 0, $curTTLs[$key1], 'Key 1 has current TTL <= 0' );
 580                 $this->assertLessThanOrEqual( 0, $curTTLs[$key2], 'Key 2 has current TTL <= 0' );
 581
 582                 usleep( 1 );
 583                 $curTTLs = [];
 584                 $this->assertEquals(
 585                         [ $key1 => $value1, $key2 => $value2 ],
 586                         $cache->getMulti( [ $key1, $key2, $key3 ], $curTTLs, [ $cKey1, $cKey2 ] ),
 587                         "Result array still populated even with new check keys"
 588                 );
 589                 $this->assertEquals( 2, count( $curTTLs ), "Current TTLs still array set" );
 590                 $this->assertLessThan( 0, $curTTLs[$key1], 'Key 1 has negative current TTL' );
 591                 $this->assertLessThan( 0, $curTTLs[$key2], 'Key 2 has negative current TTL' );
 592         }
 593
 594         /**
 595          * @covers WANObjectCache::getMulti()
 596          * @covers WANObjectCache::processCheckKeys()
 597          */
 598         public function testGetMultiCheckKeys() {
 599                 $cache = $this->cache;
 600
 601                 $checkAll = wfRandomString();
 602                 $check1 = wfRandomString();
 603                 $check2 = wfRandomString();
 604                 $check3 = wfRandomString();
 605                 $value1 = wfRandomString();
 606                 $value2 = wfRandomString();
 607
 608                 // Fake initial check key to be set in the past. Otherwise we'd have to sleep for
 609                 // several seconds during the test to assert the behaviour.
 610                 foreach ( [ $checkAll, $check1, $check2 ] as $checkKey ) {
 611                         $cache->touchCheckKey( $checkKey, WANObjectCache::HOLDOFF_NONE );
 612                 }
 613                 usleep( 100 );
 614
 615                 $cache->set( 'key1', $value1, 10 );
 616                 $cache->set( 'key2', $value2, 10 );
 617
 618                 $curTTLs = [];
 619                 $result = $cache->getMulti( [ 'key1', 'key2', 'key3' ], $curTTLs, [
 620                         'key1' => $check1,
 621                         $checkAll,
 622                         'key2' => $check2,
 623                         'key3' => $check3,
 624                 ] );
 625                 $this->assertEquals(
 626                         [ 'key1' => $value1, 'key2' => $value2 ],
 627                         $result,
 628                         'Initial values'
 629                 );
 630                 $this->assertGreaterThanOrEqual( 9.5, $curTTLs['key1'], 'Initial ttls' );
 631                 $this->assertLessThanOrEqual( 10.5, $curTTLs['key1'], 'Initial ttls' );
 632                 $this->assertGreaterThanOrEqual( 9.5, $curTTLs['key2'], 'Initial ttls' );
 633                 $this->assertLessThanOrEqual( 10.5, $curTTLs['key2'], 'Initial ttls' );
 634
 635                 $cache->touchCheckKey( $check1 );
 636
 637                 $curTTLs = [];
 638                 $result = $cache->getMulti( [ 'key1', 'key2', 'key3' ], $curTTLs, [
 639                         'key1' => $check1,
 640                         $checkAll,
 641                         'key2' => $check2,
 642                         'key3' => $check3,
 643                 ] );
 644                 $this->assertEquals(
 645                         [ 'key1' => $value1, 'key2' => $value2 ],
 646                         $result,
 647                         'key1 expired by check1, but value still provided'
 648                 );
 649                 $this->assertLessThan( 0, $curTTLs['key1'], 'key1 TTL expired' );
 650                 $this->assertGreaterThan( 0, $curTTLs['key2'], 'key2 still valid' );
 651
 652                 $cache->touchCheckKey( $checkAll );
 653
 654                 $curTTLs = [];
 655                 $result = $cache->getMulti( [ 'key1', 'key2', 'key3' ], $curTTLs, [
 656                         'key1' => $check1,
 657                         $checkAll,
 658                         'key2' => $check2,
 659                         'key3' => $check3,
 660                 ] );
 661                 $this->assertEquals(
 662                         [ 'key1' => $value1, 'key2' => $value2 ],
 663                         $result,
 664                         'All keys expired by checkAll, but value still provided'
 665                 );
 666                 $this->assertLessThan( 0, $curTTLs['key1'], 'key1 expired by checkAll' );
 667                 $this->assertLessThan( 0, $curTTLs['key2'], 'key2 expired by checkAll' );
 668         }
 669
 670         /**
 671          * @covers WANObjectCache::get()
 672          * @covers WANObjectCache::processCheckKeys()
 673          */
 674         public function testCheckKeyInitHoldoff() {
 675                 $cache = $this->cache;
 676
 677                 for ( $i = 0; $i < 500; ++$i ) {
 678                         $key = wfRandomString();
 679                         $checkKey = wfRandomString();
 680                         // miss, set, hit
 681                         $cache->get( $key, $curTTL, [ $checkKey ] );
 682                         $cache->set( $key, 'val', 10 );
 683                         $curTTL = null;
 684                         $v = $cache->get( $key, $curTTL, [ $checkKey ] );
 685
 686                         $this->assertEquals( 'val', $v );
 687                         $this->assertLessThan( 0, $curTTL, "Step $i: CTL < 0 (miss/set/hit)" );
 688                 }
 689
 690                 for ( $i = 0; $i < 500; ++$i ) {
 691                         $key = wfRandomString();
 692                         $checkKey = wfRandomString();
 693                         // set, hit
 694                         $cache->set( $key, 'val', 10 );
 695                         $curTTL = null;
 696                         $v = $cache->get( $key, $curTTL, [ $checkKey ] );
 697
 698                         $this->assertEquals( 'val', $v );
 699                         $this->assertLessThan( 0, $curTTL, "Step $i: CTL < 0 (set/hit)" );
 700                 }
 701         }
 702
 703         /**
 704          * @covers WANObjectCache::delete()
 705          */
 706         public function testDelete() {
 707                 $key = wfRandomString();
 708                 $value = wfRandomString();
 709                 $this->cache->set( $key, $value );
 710
 711                 $curTTL = null;
 712                 $v = $this->cache->get( $key, $curTTL );
 713                 $this->assertEquals( $value, $v, "Key was created with value" );
 714                 $this->assertGreaterThan( 0, $curTTL, "Existing key has current TTL > 0" );
 715
 716                 $this->cache->delete( $key );
 717
 718                 $curTTL = null;
 719                 $v = $this->cache->get( $key, $curTTL );
 720                 $this->assertFalse( $v, "Deleted key has false value" );
 721                 $this->assertLessThan( 0, $curTTL, "Deleted key has current TTL < 0" );
 722
 723                 $this->cache->set( $key, $value . 'more' );
 724                 $v = $this->cache->get( $key, $curTTL );
 725                 $this->assertFalse( $v, "Deleted key is tombstoned and has false value" );
 726                 $this->assertLessThan( 0, $curTTL, "Deleted key is tombstoned and has current TTL < 0" );
 727
 728                 $this->cache->set( $key, $value );
 729                 $this->cache->delete( $key, WANObjectCache::HOLDOFF_NONE );
 730
 731                 $curTTL = null;
 732                 $v = $this->cache->get( $key, $curTTL );
 733                 $this->assertFalse( $v, "Deleted key has false value" );
 734                 $this->assertNull( $curTTL, "Deleted key has null current TTL" );
 735
 736                 $this->cache->set( $key, $value );
 737                 $v = $this->cache->get( $key, $curTTL );
 738                 $this->assertEquals( $value, $v, "Key was created with value" );
 739                 $this->assertGreaterThan( 0, $curTTL, "Existing key has current TTL > 0" );
 740         }
 741
 742         /**
 743          * @dataProvider getWithSetCallback_versions_provider
 744          * @param array $extOpts
 745          * @param $versioned
 746          */
 747         public function testGetWithSetCallback_versions( array $extOpts, $versioned ) {
 748                 $cache = $this->cache;
 749
 750                 $key = wfRandomString();
 751                 $value = wfRandomString();
 752
 753                 $wasSet = 0;
 754                 $func = function( $old, &$ttl ) use ( &$wasSet, $value ) {
 755                         ++$wasSet;
 756                         return $value;
 757                 };
 758
 759                 // Set the main key (version N if versioned)
 760                 $wasSet = 0;
 761                 $v = $cache->getWithSetCallback( $key, 30, $func, $extOpts );
 762                 $this->assertEquals( $value, $v, "Value returned" );
 763                 $this->assertEquals( 1, $wasSet, "Value regenerated" );
 764                 $cache->getWithSetCallback( $key, 30, $func, $extOpts );
 765                 $this->assertEquals( 1, $wasSet, "Value not regenerated" );
 766                 // Set the key for version N+1 (if versioned)
 767                 if ( $versioned ) {
 768                         $verOpts = [ 'version' => $extOpts['version'] + 1 ];
 769
 770                         $wasSet = 0;
 771                         $v = $cache->getWithSetCallback( $key, 30, $func, $verOpts + $extOpts );
 772                         $this->assertEquals( $value, $v, "Value returned" );
 773                         $this->assertEquals( 1, $wasSet, "Value regenerated" );
 774
 775                         $wasSet = 0;
 776                         $v = $cache->getWithSetCallback( $key, 30, $func, $verOpts + $extOpts );
 777                         $this->assertEquals( $value, $v, "Value returned" );
 778                         $this->assertEquals( 0, $wasSet, "Value not regenerated" );
 779                 }
 780
 781                 $wasSet = 0;
 782                 $cache->getWithSetCallback( $key, 30, $func, $extOpts );
 783                 $this->assertEquals( 0, $wasSet, "Value not regenerated" );
 784
 785                 $wasSet = 0;
 786                 $cache->delete( $key );
 787                 $v = $cache->getWithSetCallback( $key, 30, $func, $extOpts );
 788                 $this->assertEquals( $value, $v, "Value returned" );
 789                 $this->assertEquals( 1, $wasSet, "Value regenerated" );
 790
 791                 if ( $versioned ) {
 792                         $wasSet = 0;
 793                         $verOpts = [ 'version' => $extOpts['version'] + 1 ];
 794                         $v = $cache->getWithSetCallback( $key, 30, $func, $verOpts + $extOpts );
 795                         $this->assertEquals( $value, $v, "Value returned" );
 796                         $this->assertEquals( 1, $wasSet, "Value regenerated" );
 797                 }
 798         }
 799
 800         public static function getWithSetCallback_versions_provider() {
 801                 return [
 802                         [ [], false ],
 803                         [ [ 'version' => 1 ], true ]
 804                 ];
 805         }
 806
 807         /**
 808          * @covers WANObjectCache::touchCheckKey()
 809          * @covers WANObjectCache::resetCheckKey()
 810          * @covers WANObjectCache::getCheckKeyTime()
 811          */
 812         public function testTouchKeys() {
 813                 $key = wfRandomString();
 814
 815                 $priorTime = microtime( true );
 816                 usleep( 100 );
 817                 $t0 = $this->cache->getCheckKeyTime( $key );
 818                 $this->assertGreaterThanOrEqual( $priorTime, $t0, 'Check key auto-created' );
 819
 820                 $priorTime = microtime( true );
 821                 usleep( 100 );
 822                 $this->cache->touchCheckKey( $key );
 823                 $t1 = $this->cache->getCheckKeyTime( $key );
 824                 $this->assertGreaterThanOrEqual( $priorTime, $t1, 'Check key created' );
 825
 826                 $t2 = $this->cache->getCheckKeyTime( $key );
 827                 $this->assertEquals( $t1, $t2, 'Check key time did not change' );
 828
 829                 usleep( 100 );
 830                 $this->cache->touchCheckKey( $key );
 831                 $t3 = $this->cache->getCheckKeyTime( $key );
 832                 $this->assertGreaterThan( $t2, $t3, 'Check key time increased' );
 833
 834                 $t4 = $this->cache->getCheckKeyTime( $key );
 835                 $this->assertEquals( $t3, $t4, 'Check key time did not change' );
 836
 837                 usleep( 100 );
 838                 $this->cache->resetCheckKey( $key );
 839                 $t5 = $this->cache->getCheckKeyTime( $key );
 840                 $this->assertGreaterThan( $t4, $t5, 'Check key time increased' );
 841
 842                 $t6 = $this->cache->getCheckKeyTime( $key );
 843                 $this->assertEquals( $t5, $t6, 'Check key time did not change' );
 844         }
 845
 846         /**
 847          * @covers WANObjectCache::getMulti()
 848          */
 849         public function testGetWithSeveralCheckKeys() {
 850                 $key = wfRandomString();
 851                 $tKey1 = wfRandomString();
 852                 $tKey2 = wfRandomString();
 853                 $value = 'meow';
 854
 855                 // Two check keys are newer (given hold-off) than $key, another is older
 856                 $this->internalCache->set(
 857                         WANObjectCache::TIME_KEY_PREFIX . $tKey2,
 858                         WANObjectCache::PURGE_VAL_PREFIX . ( microtime( true ) - 3 )
 859                 );
 860                 $this->internalCache->set(
 861                         WANObjectCache::TIME_KEY_PREFIX . $tKey2,
 862                         WANObjectCache::PURGE_VAL_PREFIX . ( microtime( true ) - 5 )
 863                 );
 864                 $this->internalCache->set(
 865                         WANObjectCache::TIME_KEY_PREFIX . $tKey1,
 866                         WANObjectCache::PURGE_VAL_PREFIX . ( microtime( true ) - 30 )
 867                 );
 868                 $this->cache->set( $key, $value, 30 );
 869
 870                 $curTTL = null;
 871                 $v = $this->cache->get( $key, $curTTL, [ $tKey1, $tKey2 ] );
 872                 $this->assertEquals( $value, $v, "Value matches" );
 873                 $this->assertLessThan( -4.9, $curTTL, "Correct CTL" );
 874                 $this->assertGreaterThan( -5.1, $curTTL, "Correct CTL" );
 875         }
 876
 877         /**
 878          * @covers WANObjectCache::reap()
 879          * @covers WANObjectCache::reapCheckKey()
 880          */
 881         public function testReap() {
 882                 $vKey1 = wfRandomString();
 883                 $vKey2 = wfRandomString();
 884                 $tKey1 = wfRandomString();
 885                 $tKey2 = wfRandomString();
 886                 $value = 'moo';
 887
 888                 $knownPurge = time() - 60;
 889                 $goodTime = microtime( true ) - 5;
 890                 $badTime = microtime( true ) - 300;
 891
 892                 $this->internalCache->set(
 893                         WANObjectCache::VALUE_KEY_PREFIX . $vKey1,
 894                         [
 895                                 WANObjectCache::FLD_VERSION => WANObjectCache::VERSION,
 896                                 WANObjectCache::FLD_VALUE => $value,
 897                                 WANObjectCache::FLD_TTL => 3600,
 898                                 WANObjectCache::FLD_TIME => $goodTime
 899                         ]
 900                 );
 901                 $this->internalCache->set(
 902                         WANObjectCache::VALUE_KEY_PREFIX . $vKey2,
 903                         [
 904                                 WANObjectCache::FLD_VERSION => WANObjectCache::VERSION,
 905                                 WANObjectCache::FLD_VALUE => $value,
 906                                 WANObjectCache::FLD_TTL => 3600,
 907                                 WANObjectCache::FLD_TIME => $badTime
 908                         ]
 909                 );
 910                 $this->internalCache->set(
 911                         WANObjectCache::TIME_KEY_PREFIX . $tKey1,
 912                         WANObjectCache::PURGE_VAL_PREFIX . $goodTime
 913                 );
 914                 $this->internalCache->set(
 915                         WANObjectCache::TIME_KEY_PREFIX . $tKey2,
 916                         WANObjectCache::PURGE_VAL_PREFIX . $badTime
 917                 );
 918
 919                 $this->assertEquals( $value, $this->cache->get( $vKey1 ) );
 920                 $this->assertEquals( $value, $this->cache->get( $vKey2 ) );
 921                 $this->cache->reap( $vKey1, $knownPurge, $bad1 );
 922                 $this->cache->reap( $vKey2, $knownPurge, $bad2 );
 923
 924                 $this->assertFalse( $bad1 );
 925                 $this->assertTrue( $bad2 );
 926
 927                 $this->cache->reapCheckKey( $tKey1, $knownPurge, $tBad1 );
 928                 $this->cache->reapCheckKey( $tKey2, $knownPurge, $tBad2 );
 929                 $this->assertFalse( $tBad1 );
 930                 $this->assertTrue( $tBad2 );
 931         }
 932
 933         /**
 934          * @covers WANObjectCache::set()
 935          */
 936         public function testSetWithLag() {
 937                 $value = 1;
 938
 939                 $key = wfRandomString();
 940                 $opts = [ 'lag' => 300, 'since' => microtime( true ) ];
 941                 $this->cache->set( $key, $value, 30, $opts );
 942                 $this->assertEquals( $value, $this->cache->get( $key ), "Rep-lagged value written." );
 943
 944                 $key = wfRandomString();
 945                 $opts = [ 'lag' => 0, 'since' => microtime( true ) - 300 ];
 946                 $this->cache->set( $key, $value, 30, $opts );
 947                 $this->assertEquals( false, $this->cache->get( $key ), "Trx-lagged value not written." );
 948
 949                 $key = wfRandomString();
 950                 $opts = [ 'lag' => 5, 'since' => microtime( true ) - 5 ];
 951                 $this->cache->set( $key, $value, 30, $opts );
 952                 $this->assertEquals( false, $this->cache->get( $key ), "Lagged value not written." );
 953         }
 954
 955         /**
 956          * @covers WANObjectCache::set()
 957          */
 958         public function testWritePending() {
 959                 $value = 1;
 960
 961                 $key = wfRandomString();
 962                 $opts = [ 'pending' => true ];
 963                 $this->cache->set( $key, $value, 30, $opts );
 964                 $this->assertEquals( false, $this->cache->get( $key ), "Pending value not written." );
 965         }
 966
 967         public function testMcRouterSupport() {
 968                 $localBag = $this->getMockBuilder( 'EmptyBagOStuff' )
 969                         ->setMethods( [ 'set', 'delete' ] )->getMock();
 970                 $localBag->expects( $this->never() )->method( 'set' );
 971                 $localBag->expects( $this->never() )->method( 'delete' );
 972                 $wanCache = new WANObjectCache( [
 973                         'cache' => $localBag,
 974                         'pool' => 'testcache-hash',
 975                         'relayer' => new EventRelayerNull( [] )
 976                 ] );
 977                 $valFunc = function () {
 978                         return 1;
 979                 };
 980
 981                 // None of these should use broadcasting commands (e.g. SET, DELETE)
 982                 $wanCache->get( 'x' );
 983                 $wanCache->get( 'x', $ctl, [ 'check1' ] );
 984                 $wanCache->getMulti( [ 'x', 'y' ] );
 985                 $wanCache->getMulti( [ 'x', 'y' ], $ctls, [ 'check2' ] );
 986                 $wanCache->getWithSetCallback( 'p', 30, $valFunc );
 987                 $wanCache->getCheckKeyTime( 'zzz' );
 988                 $wanCache->reap( 'x', time() - 300 );
 989                 $wanCache->reap( 'zzz', time() - 300 );
 990         }
 991
 992         /**
 993          * @dataProvider provideAdaptiveTTL
 994          * @covers WANObjectCache::adaptiveTTL()
 995          * @param float|int $ago
 996          * @param int $maxTTL
 997          * @param int $minTTL
 998          * @param float $factor
 999          * @param int $adaptiveTTL
1000          */
1001         public function testAdaptiveTTL( $ago, $maxTTL, $minTTL, $factor, $adaptiveTTL ) {
1002                 $mtime = $ago ? time() - $ago : $ago;
1003                 $margin = 5;
1004                 $ttl = $this->cache->adaptiveTTL( $mtime, $maxTTL, $minTTL, $factor );
1005
1006                 $this->assertGreaterThanOrEqual( $adaptiveTTL - $margin, $ttl );
1007                 $this->assertLessThanOrEqual( $adaptiveTTL + $margin, $ttl );
1008
1009                 $ttl = $this->cache->adaptiveTTL( (string)$mtime, $maxTTL, $minTTL, $factor );
1010
1011                 $this->assertGreaterThanOrEqual( $adaptiveTTL - $margin, $ttl );
1012                 $this->assertLessThanOrEqual( $adaptiveTTL + $margin, $ttl );
1013         }
1014
1015         public static function provideAdaptiveTTL() {
1016                 return [
1017                         [ 3600, 900, 30, .2, 720 ],
1018                         [ 3600, 500, 30, .2, 500 ],
1019                         [ 3600, 86400, 800, .2, 800 ],
1020                         [ false, 86400, 800, .2, 800 ],
1021                         [ null, 86400, 800, .2, 800 ]
1022                 ];
1023         }
1024 }