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| 1 | <?php |
| 2 | |
| 3 | namespace TonyBogdanov\Memoize; |
| 4 | |
| 5 | use SplObjectStorage; |
| 6 | use TonyBogdanov\Memoize\Exceptions\UnknownOwnerException; |
| 7 | use WeakReference; |
| 8 | |
| 9 | /** |
| 10 | * Class Memoize |
| 11 | * |
| 12 | * @package TonyBogdanov\Memoize |
| 13 | */ |
| 14 | final class Memoize { |
| 15 | |
| 16 | /** @var bool */ |
| 17 | private static bool $enabled = true; |
| 18 | |
| 19 | /** @var SplObjectStorage[] */ |
| 20 | private static array $storage = []; |
| 21 | |
| 22 | /** |
| 23 | * @param $owner |
| 24 | * |
| 25 | * @return array |
| 26 | */ |
| 27 | private static function owner( $owner ): array { |
| 28 | if ( is_object( $owner ) ) { |
| 29 | return [ get_class( $owner ), WeakReference::create( $owner ) ]; |
| 30 | } |
| 31 | |
| 32 | if ( is_string( $owner ) && class_exists( $owner ) ) { |
| 33 | return [ $owner, VoidMarker::get() ]; |
| 34 | } |
| 35 | |
| 36 | throw new UnknownOwnerException( $owner ); |
| 37 | } |
| 38 | |
| 39 | public static function enable(): void { |
| 40 | self::$enabled = true; |
| 41 | } |
| 42 | |
| 43 | public static function disable(): void { |
| 44 | self::$enabled = false; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * @param $owner |
| 49 | * @param string|null $key |
| 50 | * @return bool |
| 51 | */ |
| 52 | public static function isMemoized( $owner = null, string $key = null ): bool { |
| 53 | if ( ! self::$enabled || ! isset( $owner ) ) { |
| 54 | return false; |
| 55 | } |
| 56 | |
| 57 | [ $group, $ref ] = self::owner( $owner ); |
| 58 | if ( ! isset( self::$storage[ $group ] ) || ! isset( self::$storage[ $group ][ $ref ] ) ) { |
| 59 | return false; |
| 60 | } |
| 61 | |
| 62 | return ! isset( $key ) || array_key_exists( $key, self::$storage[ $group ][ $ref ] ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * @param $owner |
| 67 | * @param string $key |
| 68 | * @param callable $provider |
| 69 | * |
| 70 | * @return mixed |
| 71 | */ |
| 72 | public static function memoize( $owner, string $key, callable $provider ) { |
| 73 | if ( ! self::$enabled ) { |
| 74 | return call_user_func( $provider ); |
| 75 | } |
| 76 | |
| 77 | [ $group, $ref ] = self::owner( $owner ); |
| 78 | if ( ! isset( self::$storage[ $group ] ) ) { |
| 79 | self::$storage[ $group ] = new SplObjectStorage(); |
| 80 | } |
| 81 | |
| 82 | if ( ! isset( self::$storage[ $group ][ $ref ] ) ) { |
| 83 | self::$storage[ $group ][ $ref ] = []; |
| 84 | } |
| 85 | |
| 86 | $data = self::$storage[ $group ][ $ref ]; |
| 87 | if ( ! array_key_exists( $key, $data ) ) { |
| 88 | $data[ $key ] = call_user_func( $provider ); |
| 89 | self::$storage[ $group ][ $ref ] = $data; |
| 90 | } |
| 91 | |
| 92 | return $data[ $key ]; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * @param null $owner |
| 97 | * @param string|null $key |
| 98 | */ |
| 99 | public static function unmemoize( $owner = null, string $key = null ): void { |
| 100 | if ( ! isset( $owner ) ) { |
| 101 | self::$storage = []; |
| 102 | return; |
| 103 | } |
| 104 | |
| 105 | [ $group, $ref ] = self::owner( $owner ); |
| 106 | if ( ! isset( self::$storage[ $group ] ) || ! isset( self::$storage[ $group ][ $ref ] ) ) { |
| 107 | return; |
| 108 | } |
| 109 | |
| 110 | if ( ! isset( $key ) ) { |
| 111 | unset( self::$storage[ $group ][ $ref ] ); |
| 112 | return; |
| 113 | } |
| 114 | |
| 115 | if ( ! array_key_exists( $key, self::$storage[ $group ][ $ref ] ) ) { |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | $data = self::$storage[ $group ][ $ref ]; |
| 120 | unset( $data[ $key ] ); |
| 121 | |
| 122 | self::$storage[ $group ][ $ref ] = $data; |
| 123 | } |
| 124 | |
| 125 | } |