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<?php |
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/** |
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* Phoole (PHP7.2+) |
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* |
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* @category Library |
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* @package Phoole\Base |
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* @copyright Copyright (c) 2019 Hong Zhang |
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*/ |
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declare(strict_types=1); |
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namespace Phoole\Base\Queue; |
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/** |
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* PriorityQueue |
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* |
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* @package Phoole\Base |
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*/ |
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class PriorityQueue implements \IteratorAggregate, \Countable |
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{ |
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/** |
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* data storage |
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* |
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* @var array |
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*/ |
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protected $queue = []; |
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/** |
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* marker for sorted or not |
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* |
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* @var bool |
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*/ |
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protected $sorted = TRUE; |
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/** |
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* counter for priority |
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* |
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* @var int |
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*/ |
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protected $counter = 20000000; |
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/** |
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* Insert data into the queue with priority |
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* |
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* @param mixed $data |
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* @param int $priority priority, higher number retrieved first(-1000 - 1000) |
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* @return void |
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* @throws \RuntimeException if priority out of range |
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*/ |
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public function insert($data, int $priority = 0): void |
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{ |
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$i = $this->getIndex($priority); |
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$this->queue[$i] = ['data' => $data, 'priority' => $priority]; |
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$this->sorted = FALSE; |
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} |
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/** |
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* Combine with queue and return a combined new queue |
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* |
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* @param PriorityQueueInterface $queue |
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* @return PriorityQueueInterface |
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*/ |
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public function combine(PriorityQueue $queue): PriorityQueue |
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{ |
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$nqueue = clone $this; |
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foreach ($queue->queue as $data) { |
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$nqueue->insert($data['data'], $data['priority']); |
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} |
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return $nqueue; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function count() |
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{ |
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return count($this->queue); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getIterator() |
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{ |
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$this->sortQueue(); |
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return new \ArrayIterator(array_column($this->queue, 'data')); |
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} |
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/** |
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* Generate an integer key |
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* |
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* @param int $priority |
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* @return int |
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* @throws \RuntimeException priority out of range |
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*/ |
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protected function getIndex(int $priority): int |
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{ |
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if (abs($priority) > 1000) { |
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throw new \RuntimeException("Priority $priority out of range."); |
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} |
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return --$this->counter + $priority * 10000; |
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} |
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/** |
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* Sort the queue from higher to lower int $key |
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* |
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* @return $this |
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*/ |
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protected function sortQueue() |
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{ |
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if (!$this->sorted) { |
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krsort($this->queue); |
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$this->sorted = TRUE; |
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} |
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return $this; |
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} |
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} |
phoole /
base
