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<?php |
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namespace micmania1\config; |
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use Psr\Cache\CacheItemPoolInterface; |
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class CachedConfigCollection implements ConfigCollectionInterface |
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{ |
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/** |
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* @const string |
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*/ |
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const METADATA_KEY = '__METADATA__'; |
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/** |
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* @const string |
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*/ |
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const HISTORY_KEY = '__HISTORY__'; |
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/** |
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* @var CacheItemPoolInterface |
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*/ |
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protected $pool; |
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/** |
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* @var boolean |
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*/ |
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protected $trackMetadata = false; |
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/** |
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* @param boolean $trackMetadata |
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* @param CacheItemPoolInterface $pool |
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*/ |
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public function __construct(CacheItemPoolInterface $pool, $trackMetadata = false) |
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{ |
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$this->pool = $pool; |
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$this->trackMetadata = (bool) $trackMetadata; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function set($key, $value, $metadata = []) |
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{ |
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// We use null as the key to return an empty cache item |
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$cacheItem = $this->pool->getItem($key); |
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if($this->trackMetadata) { |
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$cachedMetadata = $this->getMetadata(); |
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$cachedHistory = $this->getHistory(); |
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if($this->exists($key) && isset($metadata[$key])) { |
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array_unshift($cachedHistory, [ |
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'value' => $value, |
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'metadata' => $metadata, |
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]); |
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} |
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$cachedMetadata[$key] = $metadata; |
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$this->saveMetadata($cachedMetadata); |
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$this->saveHistory($cachedHistory); |
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} |
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// Save our new value |
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$cacheItem->set($value); |
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$this->pool->saveDeferred($cacheItem); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get($key) |
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{ |
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if(!$this->exists($key)) { |
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return null; |
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} |
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$cacheItem = $this->pool->getItem($key); |
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return $cacheItem->get() ?: null; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function exists($key) |
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{ |
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return $this->pool->hasItem($key); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function delete($key) |
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{ |
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$this->pool->deleteItem($key); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function deleteAll() |
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{ |
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$this->pool->clear(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMetadata() |
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{ |
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return $this->getTrackingData(self::METADATA_KEY); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getHistory() |
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{ |
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return $this->getTrackingData(self::HISTORY_KEY); |
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} |
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/** |
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* A shortcut for tracking data (metadata and history). This will |
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* always return an array, even if we're not tracking. |
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* |
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* @param string $key |
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* |
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* @return array |
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*/ |
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private function getTrackingData($key) |
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{ |
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if (!$this->trackMetadata) { |
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return []; |
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} |
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$value = $this->pool->getItem($key)->get(); |
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return is_array($value) ? $value : []; |
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} |
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/** |
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* Saves the metadata to cache |
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* |
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* @param array $metadata |
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*/ |
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protected function saveMetadata($metadata) |
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{ |
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$cached = $this->pool->getItem(self::METADATA_KEY); |
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$cached->set($metadata); |
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$this->pool->saveDeferred($cached); |
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} |
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/** |
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* Saves the history to the cache |
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* |
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* @param array $history |
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*/ |
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protected function saveHistory($history) |
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{ |
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$cached = $this->pool->getItem(self::HISTORY_KEY); |
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$cached->set($history); |
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$this->pool->saveDeferred($cached); |
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} |
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/** |
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* Commits the cache |
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*/ |
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public function __destruct() |
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{ |
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$this->pool->commit(); |
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} |
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} |
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micmania1 /
silverstripe-config
