];
}
+ public function testPreemtiveRefresh() {
+ $value = 'KatCafe';
+ $wasSet = 0;
+ $func = function ( $old, &$ttl, &$opts, $asOf ) use ( &$wasSet, $value )
+ {
+ ++$wasSet;
+ return $value;
+ };
+
+ $cache = new NearExpiringWANObjectCache( [
+ 'cache' => new HashBagOStuff(),
+ 'pool' => 'empty'
+ ] );
+
+ $wasSet = 0;
+ $key = wfRandomString();
+ $opts = [ 'lowTTL' => 30 ];
+ $v = $cache->getWithSetCallback( $key, 20, $func, $opts );
+ $this->assertEquals( $value, $v, "Value returned" );
+ $this->assertEquals( 1, $wasSet, "Value calculated" );
+ $v = $cache->getWithSetCallback( $key, 20, $func, $opts );
+ $this->assertEquals( 2, $wasSet, "Value re-calculated" );
+
+ $wasSet = 0;
+ $key = wfRandomString();
+ $opts = [ 'lowTTL' => 1 ];
+ $v = $cache->getWithSetCallback( $key, 30, $func, $opts );
+ $this->assertEquals( $value, $v, "Value returned" );
+ $this->assertEquals( 1, $wasSet, "Value calculated" );
+ $v = $cache->getWithSetCallback( $key, 30, $func, $opts );
+ $this->assertEquals( 1, $wasSet, "Value cached" );
+
+ $cache = new PopularityRefreshingWANObjectCache( [
+ 'cache' => new HashBagOStuff(),
+ 'pool' => 'empty'
+ ] );
+
+ $now = microtime( true ); // reference time
+ $wasSet = 0;
+ $key = wfRandomString();
+ $opts = [ 'hotTTR' => 900 ];
+ $v = $cache->getWithSetCallback( $key, 60, $func, $opts );
+ $this->assertEquals( $value, $v, "Value returned" );
+ $this->assertEquals( 1, $wasSet, "Value calculated" );
+ $cache->setTime( $now + 30 );
+ $v = $cache->getWithSetCallback( $key, 60, $func, $opts );
+ $this->assertEquals( 1, $wasSet, "Value cached" );
+
+ $wasSet = 0;
+ $key = wfRandomString();
+ $opts = [ 'hotTTR' => 10 ];
+ $cache->setTime( $now );
+ $v = $cache->getWithSetCallback( $key, 60, $func, $opts );
+ $this->assertEquals( $value, $v, "Value returned" );
+ $this->assertEquals( 1, $wasSet, "Value calculated" );
+ $cache->setTime( $now + 30 );
+ $v = $cache->getWithSetCallback( $key, 60, $func, $opts );
+ $this->assertEquals( 2, $wasSet, "Value re-calculated" );
+ }
+
/**
* @covers WANObjectCache::getWithSetCallback()
* @covers WANObjectCache::doGetWithSetCallback()
$this->assertEquals( $class, $wanCache->determineKeyClass( $key ) );
}
}
+
+class TimeAdjustableHashBagOStuff extends HashBagOStuff {
+ private $timeOverride = 0;
+
+ public function setTime( $time ) {
+ $this->timeOverride = $time;
+ }
+
+ protected function getCurrentTime() {
+ return $this->timeOverride ?: parent::getCurrentTime();
+ }
+}
+
+class TimeAdjustableWANObjectCache extends WANObjectCache {
+ private $timeOverride = 0;
+
+ public function setTime( $time ) {
+ $this->timeOverride = $time;
+ if ( $this->cache instanceof TimeAdjustableHashBagOStuff ) {
+ $this->cache->setTime( $time );
+ }
+ }
+
+ protected function getCurrentTime() {
+ return $this->timeOverride ?: parent::getCurrentTime();
+ }
+}
+
+class NearExpiringWANObjectCache extends TimeAdjustableWANObjectCache {
+ const CLOCK_SKEW = 1;
+
+ protected function worthRefreshExpiring( $curTTL, $lowTTL ) {
+ return ( ( $curTTL + self::CLOCK_SKEW ) < $lowTTL );
+ }
+}
+
+class PopularityRefreshingWANObjectCache extends TimeAdjustableWANObjectCache {
+ protected function worthRefreshPopular( $asOf, $ageNew, $timeTillRefresh, $now ) {
+ return ( ( $now - $asOf ) > $timeTillRefresh );
+ }
+}