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Added a generic Promise type

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I anticipate increasing demand for promises, and since all the libraries I could find suck, we'll stick to our own impl for now.
This commit is contained in:
Dylan K. Taylor
2021-05-08 15:57:30 +01:00
parent 33eb97da97
commit 624495f4d3
5 changed files with 60 additions and 97 deletions
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93
src/utils/Promise.php Normal file
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<?php
/*
*
* ____ _ _ __ __ _ __ __ ____
* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* @author PocketMine Team
* @link http://www.pocketmine.net/
*
*
*/
declare(strict_types=1);
namespace pocketmine\utils;
use function spl_object_id;
/**
* @phpstan-template TValue
*/
final class Promise{
/**
* @var \Closure[]
* @phpstan-var array<int, \Closure(TValue) : void>
*/
private array $onSuccess = [];
/**
* @var \Closure[]
* @phpstan-var array<int, \Closure() : void>
*/
private array $onFailure = [];
private bool $resolved = false;
/**
* @var mixed
* @phpstan-var TValue|null
*/
private $result = null;
/**
* @phpstan-param \Closure(TValue) : void $onSuccess
* @phpstan-param \Closure() : void $onFailure
*/
public function onCompletion(\Closure $onSuccess, \Closure $onFailure) : void{
if($this->resolved){
$this->result === null ? $onFailure() : $onSuccess($this->result);
}else{
$this->onSuccess[spl_object_id($onSuccess)] = $onSuccess;
$this->onFailure[spl_object_id($onFailure)] = $onFailure;
}
}
/**
* @param mixed $value
* @phpstan-param TValue $value
*/
public function resolve($value) : void{
if($this->resolved){
throw new \InvalidStateException("Promise has already been resolved/rejected");
}
$this->resolved = true;
$this->result = $value;
foreach($this->onSuccess as $c){
$c($value);
}
$this->onSuccess = [];
$this->onFailure = [];
}
public function reject() : void{
if($this->resolved){
throw new \InvalidStateException("Promise has already been resolved/rejected");
}
$this->resolved = true;
foreach($this->onFailure as $c){
$c();
}
$this->onSuccess = [];
$this->onFailure = [];
}
}