finished cleanup of caching components.

framework/caching/ChainedDependency.php

@@ -81,9 +81,9 @@ class ChainedDependency extends Dependency
 	 */
 	public function getHasChanged()
 	{
-		foreach ($this->dependencies as $dependency) {
+		foreach ($this->dependencies as $i => $dependency) {
 			if (!$dependency instanceof Dependency) {
-				$dependency = \Yii::createObject($dependency);
+				$this->dependencies[$i] = $dependency = \Yii::createObject($dependency);
 			}
 			if ($this->dependOnAll && $dependency->getHasChanged()) {
 				return true;

framework/caching/DbCache.php

@@ -9,7 +9,7 @@
 
 namespace yii\caching;
 
-use yii\base\Exception;
+use yii\base\InvalidConfigException;
 use yii\db\Connection;
 use yii\db\Query;
 
@@ -57,7 +57,7 @@ class DbCache extends Cache
 	public $cacheTableName = 'tbl_cache';
 	/**
 	 * @var integer the probability (parts per million) that garbage collection (GC) should be performed
-	 * when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
+	 * when storing a piece of data in the cache. Defaults to 10, meaning 0.001% chance.
 	 * This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
 	 **/
 	public $gcProbability = 100;
@@ -69,7 +69,7 @@ class DbCache extends Cache
 	/**
 	 * Returns the DB connection instance used for caching purpose.
 	 * @return Connection the DB connection instance
-	 * @throws Exception if [[connectionID]] does not point to a valid application component.
+	 * @throws InvalidConfigException if [[connectionID]] does not point to a valid application component.
 	 */
 	public function getDb()
 	{
@@ -78,7 +78,7 @@ class DbCache extends Cache
 			if ($db instanceof Connection) {
 				$this->_db = $db;
 			} else {
-				throw new Exception("DbCache.connectionID must refer to the ID of a DB connection application component.");
+				throw new InvalidConfigException("DbCache::connectionID must refer to the ID of a DB application component.");
 			}
 		}
 		return $this->_db;
@@ -163,13 +163,13 @@ class DbCache extends Cache
 	 */
 	protected function setValue($key, $value, $expire)
 	{
-		$query = new Query;
-		$command = $query->update($this->cacheTableName, array(
+		$command = $this->getDb()->createCommand();
+		$command->update($this->cacheTableName, array(
 			'expire' => $expire > 0 ? $expire + time() : 0,
 			'data' => array($value, \PDO::PARAM_LOB),
 		), array(
 			'id' => $key,
-		))->createCommand($this->getDb());
+		));;
 
 		if ($command->execute()) {
 			$this->gc();
@@ -198,16 +198,16 @@ class DbCache extends Cache
 			$expire = 0;
 		}
 
-		$query = new Query;
-		$command = $query->insert($this->cacheTableName, array(
+		$command = $this->getDb()->createCommand();
+		$command->insert($this->cacheTableName, array(
 			'id' => $key,
 			'expire' => $expire,
 			'data' => array($value, \PDO::PARAM_LOB),
-		))->createCommand($this->getDb());
+		));
 		try {
 			$command->execute();
 			return true;
-		} catch (Exception $e) {
+		} catch (\Exception $e) {
 			return false;
 		}
 	}
@@ -220,10 +220,8 @@ class DbCache extends Cache
 	 */
 	protected function deleteValue($key)
 	{
-		$query = new Query;
-		$query->delete($this->cacheTableName, array('id' => $key))
-			->createCommand($this->getDb())
-			->execute();
+		$command = $this->getDb()->createCommand();
+		$command->delete($this->cacheTableName, array('id' => $key))->execute();
 		return true;
 	}
 
@@ -235,10 +233,8 @@ class DbCache extends Cache
 	public function gc($force = false)
 	{
 		if ($force || mt_rand(0, 1000000) < $this->gcProbability) {
-			$query = new Query;
-			$query->delete($this->cacheTableName, 'expire > 0 AND expire < ' . time())
-				->createCommand($this->getDb())
-				->execute();
+			$command = $this->getDb()->createCommand();
+			$command->delete($this->cacheTableName, 'expire > 0 AND expire < ' . time())->execute();
 		}
 	}
 
@@ -249,10 +245,8 @@ class DbCache extends Cache
 	 */
 	protected function flushValues()
 	{
-		$query = new Query;
-		$query->delete($this->cacheTableName)
-			->createCommand($this->getDb())
-			->execute();
+		$command = $this->getDb()->createCommand();
+		$command->delete($this->cacheTableName)->execute();
 		return true;
 	}
 }

framework/caching/DbDependency.php

@@ -9,7 +9,7 @@
 
 namespace yii\caching;
 
-use yii\base\Exception;
+use yii\base\InvalidConfigException;
 use yii\db\Connection;
 use yii\db\Query;
 
@@ -68,6 +68,9 @@ class DbDependency extends Dependency
 	protected function generateDependencyData()
 	{
 		$db = $this->getDb();
+		/**
+		 * @var \yii\db\Command $command
+		 */
 		$command = $this->query->createCommand($db);
 		if ($db->enableQueryCache) {
 			// temporarily disable and re-enable query caching
@@ -83,7 +86,7 @@ class DbDependency extends Dependency
 	/**
 	 * Returns the DB connection instance used for caching purpose.
 	 * @return Connection the DB connection instance
-	 * @throws Exception if [[connectionID]] does not point to a valid application component.
+	 * @throws InvalidConfigException if [[connectionID]] does not point to a valid application component.
 	 */
 	public function getDb()
 	{
@@ -92,7 +95,7 @@ class DbDependency extends Dependency
 			if ($db instanceof Connection) {
 				$this->_db = $db;
 			} else {
-				throw new Exception("DbDependency.connectionID must refer to the ID of a DB connection application component.");
+				throw new InvalidConfigException("DbCache::connectionID must refer to the ID of a DB application component.");
 			}
 		}
 		return $this->_db;

framework/caching/FileCache.php

@@ -9,7 +9,7 @@
 
 namespace yii\caching;
 
-use yii\base\Exception;
+use yii\base\InvalidConfigException;
 
 /**
  * FileCache implements a cache component using files.
@@ -42,10 +42,10 @@ class FileCache extends Cache
 	public $directoryLevel = 1;
 	/**
 	 * @var integer the probability (parts per million) that garbage collection (GC) should be performed
-	 * when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
-	 * This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
+	 * when storing a piece of data in the cache. Defaults to 10, meaning 0.001% chance.
+	 * This number should be between 0 and 1000000. A value 0 means no GC will be performed at all.
 	 **/
-	public $gcProbability = 100;
+	public $gcProbability = 10;
 
 	/**
 	 * Initializes this component by ensuring the existence of the cache path.
@@ -55,7 +55,7 @@ class FileCache extends Cache
 		parent::init();
 		$this->cachePath = \Yii::getAlias($this->cachePath);
 		if ($this->cachePath === false) {
-			throw new Exception('FileCache.cachePath must be a valid path alias.');
+			throw new InvalidConfigException('FileCache.cachePath must be a valid path alias.');
 		}
 		if (!is_dir($this->cachePath)) {
 			mkdir($this->cachePath, 0777, true);

framework/caching/MemCache.php

@@ -10,6 +10,7 @@
 namespace yii\caching;
 
 use yii\base\Exception;
+use yii\base\InvalidConfigException;
 
 /**
  * MemCache implements a cache application component based on [memcache](http://pecl.php.net/package/memcache)
@@ -109,12 +110,12 @@ class MemCache extends Cache
 	 * @return \Memcache|\Memcached the memcache (or memcached) object used by this cache component.
 	 * @throws Exception if memcache or memcached extension is not loaded
 	 */
-	public function getMemCache()
+	public function getMemcache()
 	{
 		if ($this->_cache === null) {
 			$extension = $this->useMemcached ? 'memcached' : 'memcache';
 			if (!extension_loaded($extension)) {
-				throw new Exception("MemCache requires PHP $extension extension to be loaded.");
+				throw new InvalidConfigException("MemCache requires PHP $extension extension to be loaded.");
 			}
 			$this->_cache = $this->useMemcached ? new \Memcached : new \Memcache;
 		}

framework/caching/ZendDataCache.php

@@ -31,7 +31,7 @@ class ZendDataCache extends Cache
 	protected function getValue($key)
 	{
 		$result = zend_shm_cache_fetch($key);
-		return $result !== NULL ? $result : false;
+		return $result === null ? false : $result;
 	}
 
 	/**