Swoole Futures
Inspired by futures Crate for Rust's Tokio asynchronous run-time.
It's on top of Swoole's coroutines system there is no special wizardry, just sugar.
Install
composer require leocavalcante/swoole-futuresUsage
Async / await
Creates and awaits for asynchronous computations in an alternative style than Swoole's coroutines.
$future = Futures\async(fn() => 1);
$result = $future->await(); // 1Futures are lazy, it only runs when you call await.
Join
Joins a list of Futures into a single Future that awaits for a list of results.
$slow_rand = function (): int {
Co::sleep(3);
return rand(1, 100);
};
$n1 = Futures\async($slow_rand);
$n2 = Futures\async($slow_rand);
$n3 = Futures\async($slow_rand);
$n = Futures\join([$n1, $n2, $n3]);
print_r($n->await());This takes 3 seconds, not 9, Futures runs concurrently! (Order isn't guaranteed)
Race
Returns the result of the first finished Future.
use Swoole\Coroutine\Http\Client;
$site1 = Futures\async(function() {
$client = new Client('www.google.com', 443, true);
$client->get('/');
return $client->body;
});
$site2 = Futures\async(function() {
$client = new Client('www.swoole.co.uk', 443, true);
$client->get('/');
return $client->body;
});
$site3 = Futures\async(function() {
$client = new Client('leocavalcante.dev', 443, true);
$client->get('/');
return $client->body;
});
$first_to_load = Futures\race([$site1, $site2, $site3]);
echo $first_to_load;And there is a Futures\select alias.
Async map
Maps an array into a list of Futures where which item runs concurrently.
$list = [1, 2, 3];
$multiply = fn(int $a) => fn(int $b) => $a * $b;
$double = $multiply(2);
$doubles = Futures\join(Futures\async_map($list, $double))->await();
print_r($doubles);Then
Sequences a series of steps for a Future, is the serial analog for join:
use function Futures\async;
$future = async(fn() => 2)
->then(fn(int $i) => async(fn() => $i + 3))
->then(fn(int $i) => async(fn() => $i * 4))
->then(fn(int $i) => async(fn() => $i - 5));
echo $future->await(); // 15Stream
Streams values/events from sink to listen with between operations.
$stream = Futures\stream()
->map(fn($val) => $val + 1)
->filter(fn($val) => $val % 2 === 0)
->map(fn($val) => $val * 2)
->listen(fn($val) => print("$val\n")); // 4 8 12 16 20
foreach (range(0, 9) as $n) {
$stream->sink($n);
}MIT © 2020