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<?php |
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namespace Wems\LoopRunner; |
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use React\EventLoop\LoopInterface; |
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class LoopedProcessRunner |
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{ |
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/** @var LoopInterface */ |
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private $loop; |
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/** @var callable */ |
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private $process; |
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/** @var int */ |
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private $elapsedTime = 0; |
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/** @var int */ |
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private $startTime; |
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/** @var int|null */ |
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private $timeLimit; |
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/** @var int */ |
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private $interval = 1; |
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/** |
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* @param LoopInterface $loop |
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* @param callable $process function that returns a boolean to decide whether to go again immediately |
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*/ |
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public function __construct(LoopInterface $loop, callable $process) |
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{ |
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$this->loop = $loop; |
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$this->process = $process; |
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} |
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/** |
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* @param callable $process function that returns a boolean to decide whether to go again immediately |
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* |
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* @return self |
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*/ |
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public function setProcess(callable $process): self |
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{ |
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$this->process = $process; |
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return $this; |
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} |
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/** |
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* @param int $timeLimit in seconds |
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* |
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* @return self |
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*/ |
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public function setTimeLimit(int $timeLimit): self |
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{ |
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$this->timeLimit = $timeLimit; |
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return $this; |
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} |
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/** |
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* @param int $interval seconds to wait between runs that didn't process anything |
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* |
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* @return self |
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*/ |
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public function setInterval(int $interval): self |
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{ |
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$this->interval = $interval; |
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return $this; |
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} |
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/** |
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* run the callable process repeatedly, every second unless it returns true in which case more than once per second |
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* in the context of pulling from a Redis queue, we return true if we processed an item because that suggests that |
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* there may be more items to process, so we should try again immediately instead of waiting for the next call |
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* this should allow us to process many items very quickly whilst retaining low overheads |
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* it will keep the loop active until the given time limit, and then expire |
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*/ |
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public function run() |
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{ |
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$this->startTime = time(); |
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$this->elapsedTime = 0; |
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$this->loop->addPeriodicTimer($this->interval, function () { |
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$process = $this->process; |
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do { |
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$didSomethingThisRun = $process(); |
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$this->updateElapsedTime(); |
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} while ($didSomethingThisRun && $this->notExceededTimeLimit()); |
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if ($this->hasExceededTimeLimit()) { |
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$this->loop->stop(); |
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} |
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}); |
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$this->loop->run(); |
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} |
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private function updateElapsedTime() |
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{ |
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$this->elapsedTime = time() - $this->startTime; |
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} |
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private function hasExceededTimeLimit(): bool |
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{ |
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// if there is no time limit then we have nothing to exceed |
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if (is_null($this->timeLimit)) { |
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return false; |
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} |
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return $this->elapsedTime >= $this->timeLimit; |
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} |
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private function notExceededTimeLimit(): bool |
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{ |
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return !$this->hasExceededTimeLimit(); |
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} |
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} |
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WEMS /
looped-process-runner
