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<?php
namespace Wikimedia\Tests\ObjectCache;
use CachedBagOStuff;
use HashBagOStuff;
use MediaWikiCoversValidator;
use PHPUnit\Framework\TestCase;
use Wikimedia\LightweightObjectStore\StorageAwareness;
use Wikimedia\TestingAccessWrapper;
/**
* @covers \CachedBagOStuff
* @group BagOStuff
*/
class CachedBagOStuffTest extends TestCase {
use MediaWikiCoversValidator;
public function testGetFromBackend() {
$backend = new HashBagOStuff;
$cache = new CachedBagOStuff( $backend );
$backend->set( 'foo', 'bar' );
$this->assertEquals( 'bar', $cache->get( 'foo' ) );
$backend->set( 'foo', 'baz' );
$this->assertEquals( 'bar', $cache->get( 'foo' ), 'cached' );
}
public function testSetAndDelete() {
$backend = new HashBagOStuff;
$cache = new CachedBagOStuff( $backend );
for ( $i = 0; $i < 10; $i++ ) {
$cache->set( "key$i", 1 );
$this->assertSame( 1, $cache->get( "key$i" ) );
$this->assertSame( 1, $backend->get( "key$i" ) );
$cache->delete( "key$i" );
$this->assertFalse( $cache->get( "key$i" ) );
$this->assertFalse( $backend->get( "key$i" ) );
}
}
public function testWriteCacheOnly() {
$backend = new HashBagOStuff;
$cache = new CachedBagOStuff( $backend );
$cache->set( 'foo', 'bar', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
$this->assertEquals( 'bar', $cache->get( 'foo' ) );
$this->assertFalse( $backend->get( 'foo' ) );
$cache->set( 'foo', 'old' );
$this->assertEquals( 'old', $cache->get( 'foo' ) );
$this->assertEquals( 'old', $backend->get( 'foo' ) );
$cache->set( 'foo', 'new', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
$this->assertEquals( 'new', $cache->get( 'foo' ) );
$this->assertEquals( 'old', $backend->get( 'foo' ) );
$cache->delete( 'foo', CachedBagOStuff::WRITE_CACHE_ONLY );
$this->assertEquals( 'old', $cache->get( 'foo' ) ); // Reloaded from backend
}
public function testCacheBackendMisses() {
$backend = new HashBagOStuff;
$cache = new CachedBagOStuff( $backend );
// First hit primes the cache with miss from the backend
$this->assertFalse( $cache->get( 'foo' ) );
// Change the value in the backend
$backend->set( 'foo', true );
// Second hit returns the cached miss
$this->assertFalse( $cache->get( 'foo' ) );
// But a fresh value is read from the backend
$backend->set( 'bar', true );
$this->assertTrue( $cache->get( 'bar' ) );
}
public function testExpire() {
$backend = $this->getMockBuilder( HashBagOStuff::class )
->onlyMethods( [ 'deleteObjectsExpiringBefore' ] )
->getMock();
$backend->expects( $this->once() )
->method( 'deleteObjectsExpiringBefore' )
->willReturn( false );
$cache = new CachedBagOStuff( $backend );
$cache->deleteObjectsExpiringBefore( '20110401000000' );
}
public function testMakeKey() {
$backend = $this->getMockBuilder( HashBagOStuff::class )
->setConstructorArgs( [ [ 'keyspace' => 'magic' ] ] )
->onlyMethods( [ 'makeKey' ] )
->getMock();
$backend->method( 'makeKey' )
->willReturn( 'special/logic' );
$cache = new CachedBagOStuff( $backend );
$this->assertSame( 'special/logic', $backend->makeKey( 'special', 'logic' ) );
$this->assertSame(
'magic:special:logic',
$cache->makeKey( 'special', 'logic' ),
"Backend keyspace used"
);
}
public function testMakeGlobalKey() {
$backend = $this->getMockBuilder( HashBagOStuff::class )
->setConstructorArgs( [ [ 'keyspace' => 'magic' ] ] )
->onlyMethods( [ 'makeGlobalKey' ] )
->getMock();
$backend->method( 'makeGlobalKey' )
->willReturn( 'special/logic' );
$cache = new CachedBagOStuff( $backend );
$this->assertSame( 'special/logic', $backend->makeGlobalKey( 'special', 'logic' ) );
$this->assertSame( 'global:special:logic', $cache->makeGlobalKey( 'special', 'logic' ) );
}
public function testErrorHandling() {
$backend = new HashBagOStuff;
$cache = new CachedBagOStuff( $backend );
$wrapper = TestingAccessWrapper::newFromObject( $cache );
$key = $cache->makeKey( 'test' );
$wp = $cache->watchErrors();
$cache->get( $key );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp ) );
$wrapper->setLastError( StorageAwareness::ERR_UNREACHABLE );
$this->assertSame( StorageAwareness::ERR_UNREACHABLE, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_UNREACHABLE, $cache->getLastError( $wp ) );
$wp = $cache->watchErrors();
$wrapper->setLastError( StorageAwareness::ERR_UNEXPECTED );
$wp2 = $cache->watchErrors();
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError( $wp ) );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp2 ) );
$cache->get( $key );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError( $wp ) );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp2 ) );
}
}
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