125 lines
2.5 KiB
PHP
125 lines
2.5 KiB
PHP
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<?php
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use JoopSchilder\React\Stream\NonBlockingInput\NonBlockingInputInterface;
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/**
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* Class DemoNonBlockingInput
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* Provides an implementation of a non-blocking input that generates
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* some data every second. After a lifetime of 4 seconds, an exception
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* is thrown to show how the stream handles exceptions from the input.
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*/
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final class DemoNonBlockingInput implements NonBlockingInputInterface
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{
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private const DATA_AVAILABLE_INTERVAL_S = 1.0;
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private const ERROR_AFTER_S = 4.0;
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private float $lastEmission = 0;
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private float $initialEmission = 0;
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public function open(): void
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{
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$this->initialEmission = microtime(true);
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}
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public function select(): ?object
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{
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$now = microtime(true);
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if ($now - $this->initialEmission > self::ERROR_AFTER_S) {
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throw new Exception('Oh no!');
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}
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if ($now - $this->lastEmission > self::DATA_AVAILABLE_INTERVAL_S) {
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$this->lastEmission = $now;
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return new stdClass();
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}
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return null;
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}
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public function close(): void
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{
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}
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}
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/**
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* Class Joke
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* Used as a payload for the DemoJokeGenerator.
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* @see DemoJokeGenerator
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*/
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final class Joke
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{
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private string $joke;
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public function __construct(string $joke)
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{
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$this->joke = $joke;
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}
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public function __toString()
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{
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return $this->joke;
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}
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}
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/**
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* Class DemoJokeGenerator
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* Generates a random joke at a random interval (0 - 2 seconds).
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*/
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final class DemoJokeGenerator implements NonBlockingInputInterface
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{
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private float $lastEmission = 0;
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private float $deadline = 0;
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private array $jokes = [
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'What did the Buddhist ask the hot dog vendor? - Make me one with everything.',
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'You know why you never see elephants hiding up in trees? - Because they’re really good at it.',
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'What is red and smells like blue paint? - Red paint.',
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'A dyslexic man walks into a bra.',
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'Where does the General keep his armies? - In his sleevies!',
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'What do you call bears with no ears? - B',
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'Why dont blind people skydive? - Because it scares the crap out of their dogs.',
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];
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private function scheduleNextJoke()
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{
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$this->lastEmission = microtime(true);
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$delay = mt_rand() / mt_getrandmax();
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$this->deadline = $this->lastEmission + (2.0 * $delay);
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}
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public function open(): void
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{
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$this->scheduleNextJoke();
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}
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public function select(): ?object
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{
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$now = microtime(true);
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if ($now > $this->deadline) {
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$this->scheduleNextJoke();
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return new Joke($this->jokes[array_rand($this->jokes)]);
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}
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return null;
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}
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public function close(): void
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{
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}
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}
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