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<?php |
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/** |
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* Native memory keys eviction |
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* User: moyo |
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* Date: 2018/6/25 |
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* Time: 5:51 PM |
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*/ |
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namespace Carno\Cache; |
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use Carno\Timer\Timer; |
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use SplPriorityQueue; |
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class Eviction |
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{ |
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/** |
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* @var SplPriorityQueue |
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*/ |
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private $heap = null; |
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/** |
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* @var string |
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*/ |
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private $daemon = null; |
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/** |
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* @var int |
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*/ |
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private $nearest = PHP_INT_MAX; |
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/** |
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* Eviction constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->heap = new class extends SplPriorityQueue { |
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/** |
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* heap constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->setExtractFlags(SplPriorityQueue::EXTR_DATA); |
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} |
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/** |
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* @param mixed $priority1 |
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* @param mixed $priority2 |
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* @return int |
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*/ |
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public function compare($priority1, $priority2) : int |
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{ |
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return $priority2 <=> $priority1; |
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} |
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/** |
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* @return array |
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*/ |
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public function nearest() : array |
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{ |
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return $this->top(); |
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} |
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/** |
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* @param int $bid |
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* @param string $key |
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* @param int $ttl |
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*/ |
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public function append(int $bid, string $key, int $ttl) : void |
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{ |
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$this->insert([time() + $ttl, $bid, $key], $ttl); |
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} |
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/** |
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* extract and forget it |
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*/ |
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public function forget() : void |
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{ |
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$this->extract(); |
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} |
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}; |
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} |
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/** |
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*/ |
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public function startup() : void |
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{ |
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$this->daemon || $this->daemon = Timer::loop(1000, [$this, 'polling']); |
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} |
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/** |
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*/ |
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public function shutdown() : void |
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{ |
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$this->daemon && Timer::clear($this->daemon); |
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} |
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/** |
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*/ |
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public function polling() : void |
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{ |
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if ($this->nearest > 0 && $this->nearest -- > 0) { |
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return; |
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} |
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$now = time(); |
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while ($this->heap->valid()) { |
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[$expired, $bid, $key] = $this->heap->nearest(); |
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if ($now < $expired) { |
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$this->nearest = $expired - $now; |
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break; |
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} |
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$this->heap->forget(); |
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if (null !== $local = Blocks::get($bid)) { |
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$local->remove($key); |
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} |
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} |
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} |
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/** |
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* @param int $bid |
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* @param string $key |
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* @param int $ttl |
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*/ |
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public function watch(int $bid, string $key, int $ttl) : void |
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{ |
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if ($ttl <= 0) { |
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return; |
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} |
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if ($ttl < $this->nearest) { |
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$this->nearest = $ttl; |
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} |
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$this->heap->append($bid, $key, $ttl); |
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} |
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} |
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carno-php /
cache
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