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FutureInterface.php
01 <?php
02 namespace GuzzleHttp\Ring\Future;
03
04 use React\Promise\PromiseInterface;
05 use React\Promise\PromisorInterface;
06
07 /**
08 * Represents the result of a computation that may not have completed yet.
09 *
10 * You can use the future in a blocking manner using the wait() function, or
11 * you can use a promise from the future to receive the result when the future
12 * has been resolved.
13 *
14 * When the future is dereferenced using wait(), the result of the computation
15 * is cached and returned for subsequent calls to wait(). If the result of the
16 * computation has not yet completed when wait() is called, the call to wait()
17 * will block until the future has completed.
18 */
19 interface FutureInterface extends PromiseInterface, PromisorInterface
20 {
21 /**
22 * Returns the result of the future either from cache or by blocking until
23 * it is complete.
24 *
25 * This method must block until the future has a result or is cancelled.
26 * Throwing an exception in the wait() method will mark the future as
27 * realized and will throw the exception each time wait() is called.
28 * Throwing an instance of GuzzleHttp\Ring\CancelledException will mark
29 * the future as realized, will not throw immediately, but will throw the
30 * exception if the future's wait() method is called again.
31 *
32 * @return mixed
33 */
34 public function wait();
35
36 /**
37 * Cancels the future, if possible.
38 */
39 public function cancel();
40 }
41