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<?php |
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namespace PhpBoot\Cache; |
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use Doctrine\Common\Cache\Cache; |
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/** |
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* 可检查缓存是否失效的缓存 |
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* @author caoym |
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* |
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*/ |
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class CheckableCache |
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{ |
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function __construct(Cache $impl){ |
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$this->impl = $impl; |
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} |
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/** |
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* 设置cache |
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* |
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* @param string $name |
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* @param mixed $var |
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* @param int |
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* @param callable $expireCheck |
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* @return boolean |
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* 缓存过期检查方法, 缓存过期(超过ttl)后, get时调用, 返回true表示缓存继续可用. |
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* 如checker($got_var, $time) |
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* |
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*/ |
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public function set($name, $var, $ttl = 0, callable $expireCheck = null) |
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{ |
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$res = $this->impl->save($name, serialize(array( |
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$var, |
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$ttl, |
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$expireCheck, |
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time(), |
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)), is_null($expireCheck) ? $ttl : 0); |
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return $res; |
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} |
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/** |
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* @param string $name |
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* @param mixed|null $default |
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* @param mixed|null $expiredData |
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* @param bool $deleteExpiredData |
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* @return mixed |
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*/ |
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public function get($name, $default = null, &$expiredData=null, $deleteExpiredData=true) |
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{ |
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$expiredData = null; |
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$res = $this->impl->fetch($name); |
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if ($res) { |
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list ($data, $ttl, $checker, $createdTime) = unserialize($res); |
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// 如果指定了checker, ttl代表每次检查的间隔时间, 0表示每次get都需要经过checker检查 |
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// 如果没有指定checker, ttl表示缓存过期时间, 为0表示永不过期 |
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if ($checker !== null) { |
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if ($ttl == 0 || ($createdTime + $ttl < time())) { |
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$valid = $checker($data, $createdTime); |
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if(!$valid){ |
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$expiredData = $data; |
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if($deleteExpiredData){ |
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$this->impl->delete($name); |
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} |
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return $default; |
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} |
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} |
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}else if ($ttl != 0 && ($createdTime + $ttl < time())) { |
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$this->impl->delete($name); |
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return $default; |
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} |
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return $data; |
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} |
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return $default; |
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} |
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/** |
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* 删除 |
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* @param string $name |
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*/ |
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public function del($name){ |
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return $this->impl->delete($name); |
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} |
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public function getImpl() |
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{ |
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return $this->impl; |
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} |
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/** |
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* @var Cache |
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*/ |
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private $impl; |
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} |
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caoym /
phpboot
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.