friendship ended with social-app. php is my new best friend
veryroundbird.house
1<?php
2
3namespace React\Http\Io;
4
5use React\EventLoop\LoopInterface;
6
7/**
8 * [internal] Clock source that returns current timestamp and memoize clock for same tick
9 *
10 * This is mostly used as an internal optimization to avoid unneeded syscalls to
11 * get the current system time multiple times within the same loop tick. For the
12 * purpose of the HTTP server, the clock is assumed to not change to a
13 * significant degree within the same loop tick. If you need a high precision
14 * clock source, you may want to use `\hrtime()` instead (PHP 7.3+).
15 *
16 * The API is modelled to resemble the PSR-20 `ClockInterface` (in draft at the
17 * time of writing this), but uses a `float` return value for performance
18 * reasons instead.
19 *
20 * Note that this is an internal class only and nothing you should usually care
21 * about for outside use.
22 *
23 * @internal
24 */
25class Clock
26{
27 /** @var LoopInterface $loop */
28 private $loop;
29
30 /** @var ?float */
31 private $now;
32
33 public function __construct(LoopInterface $loop)
34 {
35 $this->loop = $loop;
36 }
37
38 /** @return float */
39 public function now()
40 {
41 if ($this->now === null) {
42 $this->now = \microtime(true);
43
44 // remember clock for current loop tick only and update on next tick
45 $now =& $this->now;
46 $this->loop->futureTick(function () use (&$now) {
47 assert($now !== null);
48 $now = null;
49 });
50 }
51
52 return $this->now;
53 }
54}