Fixes #1162: removed constructors of cache dependency classes so that they can be easily created from configuration.

framework/yii/caching/ChainedDependency.php

@@ -23,7 +23,7 @@ class ChainedDependency extends Dependency
 	 * @var Dependency[] list of dependencies that this dependency is composed of.
 	 * Each array element must be a dependency object.
 	 */
-	public $dependencies;
+	public $dependencies = [];
 	/**
 	 * @var boolean whether this dependency is depending on every dependency in [[dependencies]].
 	 * Defaults to true, meaning if any of the dependencies has changed, this dependency is considered changed.
@@ -32,18 +32,6 @@ class ChainedDependency extends Dependency
 	 */
 	public $dependOnAll = true;
 
-	/**
-	 * Constructor.
-	 * @param Dependency[] $dependencies list of dependencies that this dependency is composed of.
-	 * Each array element should be a dependency object.
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($dependencies = [], $config = [])
-	{
-		$this->dependencies = $dependencies;
-		parent::__construct($config);
-	}
-
 	/**
 	 * Evaluates the dependency by generating and saving the data related with dependency.
 	 * @param Cache $cache the cache component that is currently evaluating this dependency

framework/yii/caching/DbDependency.php

@@ -34,20 +34,7 @@ class DbDependency extends Dependency
 	/**
 	 * @var array the parameters (name => value) to be bound to the SQL statement specified by [[sql]].
 	 */
-	public $params;
+	public $params = [];
-
-	/**
-	 * Constructor.
-	 * @param string $sql the SQL query whose result is used to determine if the dependency has been changed.
-	 * @param array $params the parameters (name => value) to be bound to the SQL statement specified by [[sql]].
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($sql, $params = [], $config = [])
-	{
-		$this->sql = $sql;
-		$this->params = $params;
-		parent::__construct($config);
-	}
 
 	/**
 	 * Generates the data needed to determine if dependency has been changed.
@@ -62,6 +49,9 @@ class DbDependency extends Dependency
 		if (!$db instanceof Connection) {
 			throw new InvalidConfigException("DbDependency::db must be the application component ID of a DB connection.");
 		}
+		if ($this->sql === null) {
+			throw new InvalidConfigException("DbDependency::sql must be set.");
+		}
 
 		if ($db->enableQueryCache) {
 			// temporarily disable and re-enable query caching

framework/yii/caching/ExpressionDependency.php

@@ -27,26 +27,13 @@ class ExpressionDependency extends Dependency
 	 * A PHP expression can be any PHP code that evaluates to a value. To learn more about what an expression is,
 	 * please refer to the [php manual](http://www.php.net/manual/en/language.expressions.php).
 	 */
-	public $expression;
+	public $expression = 'true';
 	/**
 	 * @var mixed custom parameters associated with this dependency. You may get the value
 	 * of this property in [[expression]] using `$this->params`.
 	 */
 	public $params;
 
-	/**
-	 * Constructor.
-	 * @param string $expression the PHP expression whose result is used to determine the dependency.
-	 * @param mixed $params the custom parameters associated with this dependency
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($expression = 'true', $params = null, $config = [])
-	{
-		$this->expression = $expression;
-		$this->params = $params;
-		parent::__construct($config);
-	}
-
 	/**
 	 * Generates the data needed to determine if dependency has been changed.
 	 * This method returns the result of the PHP expression.

framework/yii/caching/FileDependency.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\caching;
+use yii\base\InvalidConfigException;
 
 /**
  * FileDependency represents a dependency based on a file's last modification time.
@@ -24,25 +25,18 @@ class FileDependency extends Dependency
 	 */
 	public $fileName;
 
-	/**
-	 * Constructor.
-	 * @param string $fileName name of the file whose change is to be checked.
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($fileName = null, $config = [])
-	{
-		$this->fileName = $fileName;
-		parent::__construct($config);
-	}
-
 	/**
 	 * Generates the data needed to determine if dependency has been changed.
 	 * This method returns the file's last modification time.
 	 * @param Cache $cache the cache component that is currently evaluating this dependency
 	 * @return mixed the data needed to determine if dependency has been changed.
+	 * @throws InvalidConfigException if [[fileName]] is not set
 	 */
 	protected function generateDependencyData($cache)
 	{
+		if ($this->fileName === null) {
+			throw new InvalidConfigException('FileDependency::fileName must be set');
+		}
 		return @filemtime($this->fileName);
 	}
 }

framework/yii/caching/GroupDependency.php

@@ -6,6 +6,7 @@
  */
 
 namespace yii\caching;
+use yii\base\InvalidConfigException;
 
 /**
  * GroupDependency marks a cached data item with a group name.
@@ -19,29 +20,22 @@ namespace yii\caching;
 class GroupDependency extends Dependency
 {
 	/**
-	 * @var string the group name
+	 * @var string the group name. This property must be set.
 	 */
 	public $group;
 
-	/**
-	 * Constructor.
-	 * @param string $group the group name
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($group, $config = [])
-	{
-		$this->group = $group;
-		parent::__construct($config);
-	}
-
 	/**
 	 * Generates the data needed to determine if dependency has been changed.
 	 * This method does nothing in this class.
 	 * @param Cache $cache the cache component that is currently evaluating this dependency
 	 * @return mixed the data needed to determine if dependency has been changed.
+	 * @throws InvalidConfigException if [[group]] is not set.
 	 */
 	protected function generateDependencyData($cache)
 	{
+		if ($this->group === null) {
+			throw new InvalidConfigException('GroupDependency::group must be set');
+		}
 		$version = $cache->get([__CLASS__, $this->group]);
 		if ($version === false) {
 			$version = $this->invalidate($cache, $this->group);
@@ -53,9 +47,13 @@ class GroupDependency extends Dependency
 	 * Performs the actual dependency checking.
 	 * @param Cache $cache the cache component that is currently evaluating this dependency
 	 * @return boolean whether the dependency is changed or not.
+	 * @throws InvalidConfigException if [[group]] is not set.
 	 */
 	public function getHasChanged($cache)
 	{
+		if ($this->group === null) {
+			throw new InvalidConfigException('GroupDependency::group must be set');
+		}
 		$version = $cache->get([__CLASS__, $this->group]);
 		return $version === false || $version !== $this->data;
 	}