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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\RequestTimeout; |
| 4 | |
| 5 | use Wikimedia\RequestTimeout\Detail\BasicRequestTimeout; |
| 6 | use Wikimedia\RequestTimeout\Detail\ExcimerRequestTimeout; |
| 7 | |
| 8 | abstract class RequestTimeout { |
| 9 | /** @var RequestTimeout|null The singleton instance */ |
| 10 | private static $instance; |
| 11 | |
| 12 | /** |
| 13 | * Get a singleton instance of RequestTimeout. If the Excimer extension is |
| 14 | * loaded, this will return a fully functional implementation. If it is |
| 15 | * not loaded, a fallback implementation will be returned. |
| 16 | * |
| 17 | * @return RequestTimeout |
| 18 | */ |
| 19 | public static function singleton() { |
| 20 | if ( !self::$instance ) { |
| 21 | self::$instance = self::factory(); |
| 22 | } |
| 23 | return self::$instance; |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Set the instance to be returned by singleton(), or null to clear the |
| 28 | * instance so that it will be recreated. |
| 29 | * |
| 30 | * @param RequestTimeout|null $instance |
| 31 | */ |
| 32 | public static function setInstance( ?RequestTimeout $instance ) { |
| 33 | self::$instance = $instance; |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Create a new instance of RequestTimeout. If the Excimer extension is |
| 38 | * loaded, this will return a fully functional implementation. If it is |
| 39 | * not loaded, a fallback implementation will be returned. |
| 40 | * |
| 41 | * @return RequestTimeout |
| 42 | */ |
| 43 | public static function factory() { |
| 44 | if ( extension_loaded( 'excimer' ) ) { |
| 45 | return new ExcimerRequestTimeout; |
| 46 | } else { |
| 47 | // @codeCoverageIgnoreStart |
| 48 | return new BasicRequestTimeout; |
| 49 | // @codeCoverageIgnoreEnd |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Create a CriticalSectionProvider with the specified configuration. |
| 55 | * |
| 56 | * @param float $emergencyLimit The emergency timeout in seconds |
| 57 | * @param callable|null $emergencyCallback A callback to call when the |
| 58 | * emergency timeout expires. If null, an exception will be thrown. |
| 59 | * @param callable|null $implicitExitCallback A callback to call if a |
| 60 | * critical section scope is exited implicitly, rather than by calling |
| 61 | * exit(). |
| 62 | * @return CriticalSectionProvider |
| 63 | */ |
| 64 | public function createCriticalSectionProvider( |
| 65 | $emergencyLimit, $emergencyCallback = null, $implicitExitCallback = null |
| 66 | ) { |
| 67 | return new CriticalSectionProvider( $this, $emergencyLimit, |
| 68 | $emergencyCallback, $implicitExitCallback ); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * @internal For use by CriticalSectionProvider |
| 73 | * |
| 74 | * @param string $name |
| 75 | * @param float $emergencyLimit |
| 76 | * @param callable|null $emergencyCallback |
| 77 | * @return int |
| 78 | */ |
| 79 | abstract public function enterCriticalSection( $name, $emergencyLimit, $emergencyCallback ); |
| 80 | |
| 81 | /** |
| 82 | * @internal For use by CriticalSectionProvider |
| 83 | * |
| 84 | * @throws TimeoutException |
| 85 | * @param int $id |
| 86 | */ |
| 87 | abstract public function exitCriticalSection( $id ); |
| 88 | |
| 89 | /** |
| 90 | * Set the wall time limit. If excimer is available, an exception will be |
| 91 | * thrown after the specified number of seconds. |
| 92 | * |
| 93 | * If excimer is not available, this falls back to set_time_limit(), which |
| 94 | * causes a fatal error after the CPU time (not wall clock time) exceeds |
| 95 | * the given number of seconds, which is rounded to an integer. |
| 96 | * |
| 97 | * A time limit of INF or 0 is interpreted as no limit. |
| 98 | * |
| 99 | * @param float $limit The limit in seconds |
| 100 | */ |
| 101 | abstract public function setWallTimeLimit( $limit ); |
| 102 | |
| 103 | /** |
| 104 | * Get the amount of time remaining of the limit. If there is no limit, INF |
| 105 | * will be returned. |
| 106 | * |
| 107 | * @return float |
| 108 | */ |
| 109 | abstract public function getWallTimeRemaining(); |
| 110 | |
| 111 | /** |
| 112 | * Get the current wall time limit, or INF if there is no limit |
| 113 | * |
| 114 | * @return float |
| 115 | */ |
| 116 | abstract public function getWallTimeLimit(); |
| 117 | } |