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<?php |
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namespace AsyncPHP\Icicle\Cache\Driver; |
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use AsyncPHP\Icicle\Cache\Driver; |
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use Icicle\Concurrent\Forking\Fork; |
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use Icicle\Coroutine; |
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use Icicle\Loop; |
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use Icicle\Promise; |
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use Icicle\Promise\Deferred; |
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use Icicle\Promise\PromiseInterface; |
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class MemoryDriver implements Driver |
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{ |
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/** |
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* @var array |
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*/ |
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private $cache = []; |
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/** |
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* @var array |
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*/ |
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private $waiting = []; |
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/** |
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* @var array |
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*/ |
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private $busy = []; |
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/** |
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* @inheritdoc |
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* |
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* @param string $key |
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* |
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* @return PromiseInterface |
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* |
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* @resolve mixed |
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*/ |
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public function get($key) |
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{ |
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$deferred = new Deferred(); |
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Loop\queue(function () use ($deferred, $key) { |
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if ($this->busy($deferred, $key)) { |
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$this->wait($deferred, $key); |
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} else { |
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$deferred->resolve($this->value($key)); |
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} |
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}); |
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return $deferred->getPromise(); |
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} |
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/** |
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* @param Deferred $deferred |
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* @param string $key |
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* |
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* @return bool |
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*/ |
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private function busy(Deferred $deferred, $key) |
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{ |
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return isset($this->busy[$key]) and spl_object_hash($this->busy[$key]) !== spl_object_hash($deferred); |
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} |
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/** |
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* @param Deferred $deferred |
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* @param string $key |
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*/ |
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private function wait(Deferred $deferred, $key) |
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{ |
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if (!isset($this->waiting[$key])) { |
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$this->waiting[$key] = []; |
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} |
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$this->waiting[$key][] = $deferred; |
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} |
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/** |
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* @param string $key |
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* |
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* @return mixed |
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*/ |
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private function value($key) |
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{ |
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if (isset($this->cache[$key])) { |
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return $this->cache[$key]; |
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} |
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return null; |
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} |
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/** |
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* @inheritdoc |
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* |
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* @param string $key |
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* @param mixed $value |
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* |
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* @return PromiseInterface |
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* |
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* @resolve mixed |
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*/ |
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public function set($key, $value) |
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{ |
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$deferred = new Deferred(); |
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Loop\queue(function () use ($deferred, $key, $value) { |
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if ($this->busy($deferred, $key)) { |
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$this->wait($deferred, $key); |
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} else { |
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Coroutine\create(function () use ($deferred, $key, $value) { |
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$this->busy[$key] = $deferred; |
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if (is_callable($value)) { |
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$fork = Fork::spawn($value); |
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$value = (yield $fork->join()); |
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} |
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$this->cache[$key] = $value; |
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unset($this->busy[$key]); |
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if (isset($this->waiting[$key])) { |
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while (count($this->waiting[$key])) { |
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/** @var Deferred $next */ |
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$next = array_shift($this->waiting[$key]); |
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$next->resolve($value); |
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} |
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} |
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$deferred->resolve($value); |
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}); |
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} |
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}); |
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return $deferred->getPromise(); |
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} |
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/** |
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* @inheritdoc |
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* |
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* @param string $key |
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* |
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* @return PromiseInterface |
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* |
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* @resolve void |
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*/ |
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public function forget($key) |
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{ |
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$deferred = new Deferred(); |
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Loop\queue(function () use ($deferred, $key) { |
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unset($this->cache[$key]); |
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$deferred->resolve(); |
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}); |
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return $deferred->getPromise(); |
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} |
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} |
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asyncphp /
icicle-cache
Loading history...
PHP has two types of connecting operators (logical operators, and boolean operators):
and&&or||The difference between these is the order in which they are executed. In most cases, you would want to use a boolean operator like
&&, or||.Let’s take a look at a few examples:
Logical Operators are used for Control-Flow
One case where you explicitly want to use logical operators is for control-flow such as this:
Since
dieintroduces problems of its own, f.e. it makes our code hardly testable, and prevents any kind of more sophisticated error handling; you probably do not want to use this in real-world code. Unfortunately, logical operators cannot be combined withthrowat this point:These limitations lead to logical operators rarely being of use in current PHP code.