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<?php |
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namespace Bdf\Prime\Query\Extension; |
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use Bdf\Prime\Cache\CacheInterface; |
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use Bdf\Prime\Cache\CacheKey; |
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use Bdf\Prime\Connection\ConnectionInterface; |
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use Bdf\Prime\Query\Contract\Cachable; |
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/** |
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* Provides result cache on queries |
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* |
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* @see Cachable |
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* |
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* @property ConnectionInterface $connection |
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* |
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* @todo Cache statement instead of assoc array result ? |
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*/ |
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trait CachableTrait |
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{ |
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/** |
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* @var null|CacheInterface |
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*/ |
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protected $cache; |
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/** |
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* @var CacheKey |
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*/ |
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protected $cacheKey = null; |
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/** |
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* @see Cachable::cache() |
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*/ |
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public function cache() |
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{ |
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return $this->cache; |
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} |
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/** |
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* @see Cachable::useCache() |
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*/ |
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public function useCache(int $lifetime = 0, ?string $key = null) |
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{ |
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if ($this->cacheKey === null) { |
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$this->cacheKey = new CacheKey( |
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function () { return $this->cacheNamespace(); }, |
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$key ?? function () { return $this->cacheKey(); }, |
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$lifetime |
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); |
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return $this; |
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} |
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$this->cacheKey->setLifetime($lifetime); |
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if ($key !== null) { |
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$this->cacheKey->setKey($key); |
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} |
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return $this; |
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} |
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/** |
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* @see Cachable::setCache() |
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*/ |
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public function setCache(CacheInterface $cache = null) |
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{ |
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$this->cache = $cache; |
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return $this; |
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} |
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/** |
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* @see Cachable::setCacheLifetime() |
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*/ |
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public function setCacheLifetime(int $lifetime) |
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{ |
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if (!$this->cacheKey) { |
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$this->useCache(); |
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} |
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$this->cacheKey->setLifetime($lifetime); |
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return $this; |
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} |
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/** |
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* @see Cachable::setCacheKey() |
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*/ |
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public function setCacheKey(?string $cacheKey) |
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{ |
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if (!$this->cacheKey) { |
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$this->useCache(); |
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} |
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$this->cacheKey->setKey($cacheKey); |
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return $this; |
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} |
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/** |
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* @see Cachable::setCacheNamespace() |
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*/ |
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public function setCacheNamespace(string $namespace) |
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{ |
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if (!$this->cacheKey) { |
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$this->useCache(); |
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} |
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$this->cacheKey->setNamespace($namespace); |
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return $this; |
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} |
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/** |
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* @see Cachable::getCacheKey() |
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*/ |
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public function getCacheKey(): ?CacheKey |
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{ |
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return $this->cacheKey; |
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} |
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/** |
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* Retrieve data from cache, or execute the query and save into cache |
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* |
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* @return mixed |
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*/ |
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protected function executeCached() |
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{ |
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$key = $this->cacheKey; |
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if (!$this->cache || !$key || !$key->valid()) { |
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return $this->connection->execute($this)->all(); |
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} |
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$data = $this->cache->get($key); |
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if ($data !== null) { |
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return $data; |
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} |
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$data = $this->connection->execute($this)->all(); |
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$this->cache->set($key, $data); |
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return $data; |
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} |
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/** |
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* Clear the cache when a write operation is performed |
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*/ |
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protected function clearCacheOnWrite() |
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{ |
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if ($this->cache) { |
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$this->cache->flush($this->cacheKey ? $this->cacheKey->namespace() : $this->cacheNamespace()); |
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} |
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} |
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/** |
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* Get the cache key |
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* The cache key is generated from the query string |
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* |
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* @return string |
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*/ |
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protected function cacheKey() |
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{ |
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return null; |
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} |
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/** |
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* Get cache namespace |
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* The namespace is in form : [connection name] ":" [table name] |
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* |
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* @return string |
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*/ |
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protected function cacheNamespace() |
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{ |
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return $this->connection->getName().':'.(isset($this->statements['tables'][0]['table']) ? $this->statements['tables'][0]['table'] : ''); |
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} |
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} |
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