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PromiseInterface.php
01 <?php
02
03 namespace GuzzleHttp\Promise;
04
05 /**
06 * A promise represents the eventual result of an asynchronous operation.
07 *
08 * The primary way of interacting with a promise is through its then method,
09 * which registers callbacks to receive either a promise’s eventual value or
10 * the reason why the promise cannot be fulfilled.
11 *
12 * @link https://promisesaplus.com/
13 */
14 interface PromiseInterface
15 {
16 const PENDING = 'pending';
17 const FULFILLED = 'fulfilled';
18 const REJECTED = 'rejected';
19
20 /**
21 * Appends fulfillment and rejection handlers to the promise, and returns
22 * a new promise resolving to the return value of the called handler.
23 *
24 * @param callable $onFulfilled Invoked when the promise fulfills.
25 * @param callable $onRejected Invoked when the promise is rejected.
26 *
27 * @return PromiseInterface
28 */
29 public function then(
30 callable $onFulfilled = null,
31 callable $onRejected = null
32 );
33
34 /**
35 * Appends a rejection handler callback to the promise, and returns a new
36 * promise resolving to the return value of the callback if it is called,
37 * or to its original fulfillment value if the promise is instead
38 * fulfilled.
39 *
40 * @param callable $onRejected Invoked when the promise is rejected.
41 *
42 * @return PromiseInterface
43 */
44 public function otherwise(callable $onRejected);
45
46 /**
47 * Get the state of the promise ("pending", "rejected", or "fulfilled").
48 *
49 * The three states can be checked against the constants defined on
50 * PromiseInterface: PENDING, FULFILLED, and REJECTED.
51 *
52 * @return string
53 */
54 public function getState();
55
56 /**
57 * Resolve the promise with the given value.
58 *
59 * @param mixed $value
60 *
61 * @throws \RuntimeException if the promise is already resolved.
62 */
63 public function resolve($value);
64
65 /**
66 * Reject the promise with the given reason.
67 *
68 * @param mixed $reason
69 *
70 * @throws \RuntimeException if the promise is already resolved.
71 */
72 public function reject($reason);
73
74 /**
75 * Cancels the promise if possible.
76 *
77 * @link https://github.com/promises-aplus/cancellation-spec/issues/7
78 */
79 public function cancel();
80
81 /**
82 * Waits until the promise completes if possible.
83 *
84 * Pass $unwrap as true to unwrap the result of the promise, either
85 * returning the resolved value or throwing the rejected exception.
86 *
87 * If the promise cannot be waited on, then the promise will be rejected.
88 *
89 * @param bool $unwrap
90 *
91 * @return mixed
92 *
93 * @throws \LogicException if the promise has no wait function or if the
94 * promise does not settle after waiting.
95 */
96 public function wait($unwrap = true);
97 }
98