public function testLeastRecentlyUsedShiftForLimitedCacheSize()
{
$instance = new FixedInMemoryCache(5);
$instance->save('berlin', array('berlin'));
$this->assertEquals(array('berlin'), $instance->fetch('berlin'));
foreach (array('paris', 'london', '東京', '北京', 'new york') as $city) {
$instance->save($city, array($city));
}
// 'paris' was added and removes 'berlin' from the cache
$this->assertFalse($instance->fetch('berlin'));
$stats = $instance->getStats();
$this->assertEquals(5, $stats['count']);
// 'paris' moves to the top (last postion as most recently used) and
// 'london' becomes the next LRU candidate
$this->assertEquals(array('paris'), $instance->fetch('paris'));
$instance->save('rio', 'rio');
$this->assertFalse($instance->fetch('london'));
// 東京 would be the next LRU slot but setting it again will move it to MRU
// and push 北京 into the next LRU position
$instance->save('東京', '東京');
$instance->save('sidney', 'sidney');
$this->assertFalse($instance->fetch('北京'));
$stats = $instance->getStats();
$this->assertEquals(5, $stats['count']);
}
public function testGetDataItemForCachedId()
{
$connection = $this->getMockBuilder('\\SMW\\MediaWiki\\Database')->disableOriginalConstructor()->getMock();
$connection->expects($this->never())->method('selectRow');
$cache = new FixedInMemoryCache();
$cache->save(42, 'Foo#0##');
$instance = new DataItemByIdFinder($connection, 'foo', $cache);
$this->assertInstanceOf('\\SMW\\DIWikiPage', $instance->getDataItemForId(42));
$stats = $cache->getStats();
$this->assertEquals(0, $stats['misses']);
$this->assertEquals(1, $stats['hits']);
}