おもいついたら書く日記

http://www.exgear.jp/blog/2008/11/method_cache_behavior/
http://d.hatena.ne.jp/lifegood/20090604/p1
こちらを元ネタにして
若干改良をほどこしました。

１．CacheBehaviorの導入

class CacheBehavior extends ModelBehavior {
	var $enabled = true;
	
	var $config = array();
	
	function setup(&$model, $config = array()) {
		$this->config[$model->alias] = $config;
	}
	
	//config設定
	function _setConfig(&$model,$config = null){
		if(empty($config)){
			$config = $this->config[$model->alias];
		}
		if(is_array($config)){
			if(!empty($config['config'])){
				$config = $config['config'];
			}else{
				$config = null;
			} 
		}
		return $config;
	}
	
	/**
	 * メソッドキャッシュ
	 */
	function cacheMethod(&$model, $method, $args = array(),$config = null){
		$config = $this->_setConfig($model,$config);
		
		$this->enabled = false;
		// キャッシュキー
		$cachekey = $this->createCacheKey($model, $method, $args ,$config);

		$ret = Cache::read($cachekey,$config);
		if(!empty($ret)){
			$this->enabled = true;
			return $ret;
		}
		$ret = call_user_func_array(array($model, $method), $args);
		$this->enabled = true;
		Cache::write($cachekey, $ret, $config);
		// クリア用にモデル毎のキャッシュキーリストを作成
		$cacheListKey = get_class($model) . '_cacheMethodList';
		$list = Cache::read($cacheListKey);
		$list[$cachekey] = $config;
		Cache::write($cacheListKey, $list);
		return $ret;
	}
	
	/**
	 * キャッシュキーの生成
	 *
	 */
	function createCacheKey(&$model, $method, $args = array(),$config = null){
		return  get_class($model) . '_' . $method . '_' . $this->_setConfig($model,$config)  . '_' . md5(serialize($args));
	}
	/**
	 * 再帰防止判定用
	 */
	function cacheEnabled(&$model){
		return $this->enabled;
	}
	/**
	 * キャッシュ個別クリア
	 */
	function cacheDelete(&$model, $method, $args = array(),$config = null){
		$config = $this->_setConfig($model,$config);
		$cacheListKey = $this->createCacheKey($model, $method, $args, $config);
		Cache::delete($cacheListKey,$config);
		
	}
	/**
	 * キャッシュ全クリア
	 */
	function cacheDeleteAll(&$model){
		$cacheListKey = get_class($model) . '_cacheMethodList';
		$list = Cache::read($cacheListKey);
		if(empty($list)) return;
		foreach($list as $key => $config){
			Cache::delete($key,$config);
		}
		Cache::delete($cacheListKey);
	}
	/**
	 * 追加・変更・削除時にはキャッシュをクリア
	 */
	function afterSave(&$model, $created) {
		$this->cacheDeleteAll($model);
	}
	function afterDelete(&$model) {
		$this->cacheDeleteAll($model);
	}
}

２．find()のオーバーライド

class AppModel extends Model {
var $actsAs = array('Cache' => array('config'=>'_app_find_'));

	function find($conditions = null, $fields = array(), $order = null, $recursive = null) {

	     // Call cache method
	          $args = func_get_args();
	          if ($this->Behaviors->attached('Cache')) {
	               if($this->cacheEnabled()) {
	                    return $this->cacheMethod(__FUNCTION__, $args );
	               }
	          }
	     // Case normal find. The model does not have cache behavior.
	          return parent::find($conditions, $fields, $order, $recursive);
	}
}