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<?php |
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namespace ResourcePool; |
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use React\Promise\PromiseInterface; |
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use React\Promise\RejectedPromise; |
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/** |
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* @author Josh Di Fabio <[email protected]> |
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* |
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* @api |
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*/ |
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class AllocationPromise implements PromiseInterface |
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{ |
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private $promise; |
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private $resolver; |
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private $result; |
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public function __construct(PromiseInterface $promise, $resolver = null) |
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{ |
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$this->promise = $promise; |
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$this->resolver = $resolver; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function then(callable $fulfilledHandler = null, callable $errorHandler = null, callable $progressHandler = null) |
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{ |
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return $this->promise->then($fulfilledHandler, $errorHandler, $progressHandler); |
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} |
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/** |
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* Calls the specified handler when this promise is fulfilled. |
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* |
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* If the handler returns a promise, |
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* |
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* @param callable $handler |
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* @return PromiseInterface |
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*/ |
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public function to($handler /*, $args… */) |
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{ |
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$args = array_slice(func_get_args(), 1); |
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return $this->then( |
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function (Allocation $allocation) use ($handler, $args) { |
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try { |
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$result = call_user_func_array($handler, $args); |
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$result = \React\Promise\resolve($result); |
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$result->then(array($allocation, 'releaseAll'), array($allocation, 'releaseAll')); |
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} catch (\Exception $e) { |
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$result = new RejectedPromise($e); |
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$allocation->releaseAll(); |
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} |
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return $result; |
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} |
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); |
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} |
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/** |
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* Tries to return the allocation now, synchronously |
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* |
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* If the pool does not have sufficient resources available then an exception is thrown and this |
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* promise is rejected |
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* |
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* @return Allocation |
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* @throws \RuntimeException thrown if the allocation fails or has previously failed |
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*/ |
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public function now() |
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{ |
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return $this->getResult(false); |
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} |
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protected function getResult($burst) |
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{ |
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if (null === $this->result) { |
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$this->result = $this->resolve($burst); |
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} |
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if ($this->result instanceof \Exception) { |
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throw $this->result; |
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} |
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return $this->result; |
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} |
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private function resolve($burst) |
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{ |
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$result = null; |
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$this->promise->then( |
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function ($allocation) use (&$result) { |
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$result = $allocation; |
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}, |
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function ($error) use (&$result) { |
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$result = $error; |
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} |
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); |
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if (null === $result) { |
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call_user_func($this->resolver, $burst); |
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} |
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return $result ?: new \LogicException('The resolver did not resolve the promise'); |
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} |
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} |
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joshdifabio /
resource-pool
