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/** * Loads associated objects for comment triggers. * * When an action is called in a context that does not match its type, the * object that the action expects must be retrieved. For example, when an action * that works on nodes is called during the comment hook, the node object is not * available since the comment hook doesn't pass it. So here we load the object * the action expects. * * @param $type * The type of action that is about to be called. * @param $comment * The comment that was passed via the comment hook. * * @return * The object expected by the action that is about to be called. */ function _trigger_normalize_comment_context($type, $comment) { switch ($type) { // An action that works with nodes is being called in a comment context. case 'node': return node_load(is_array($comment) $comment['nid'] : $comment->nid); // An action that works on users is being called in a comment context. case 'user': return user_load(is_array($comment) $comment['uid'] : $comment->uid); } }

The Bourne shell and its successors have expansions to replace an empty or unset variable with a default, to assign a default value to a variable if it is empty or unset, and to halt execution and print an error message if a variable is empty or unset.

A C# event actually expands into two hidden methods, one having an add_ prefix, the other having a remove_ prefix. Each prefix is followed by the name of the C# event. For example, the Exploded event results in two hidden methods named add_Exploded() and remove_Exploded(). If you were to check out the CIL instructions behind add_AboutToBlow(), you would find a call to Delegate.Combine() method. Consider the partial CIL code: .method public hidebysig specialname instance void add_AboutToBlow(class CarEvents.Car/CarEngineHandler 'value') cil managed { ... call class [mscorlib]System.Delegate [mscorlib]System.Delegate::Combine( class [mscorlib]System.Delegate, class [mscorlib]System.Delegate) ... } As you would expect, remove_AboutToBlow() will call Delegate.Remove() on your behalf: .method public hidebysig specialname instance void remove_AboutToBlow(class CarEvents.Car/CarEngineHandler 'value') cil managed synchronized { ... call class [mscorlib]System.Delegate [mscorlib]System.Delegate::Remove( class [mscorlib]System.Delegate, class [mscorlib]System.Delegate) ... } Finally, the CIL code representing the event itself makes use of the .addon and .removeon directives to map the names of the correct add_XXX() and remove_XXX() methods to invoke: .event CarEvents.Car/EngineHandler AboutToBlow { .addon void CarEvents.Car::add_AboutToBlow (class CarEvents.Car/CarEngineHandler) .removeon void CarEvents.Car::remove_AboutToBlow (class CarEvents.Car/CarEngineHandler) } Now that you understand how to build a class that can send C# events (and are aware that events are little more than a typing time-saver), the next big question is how to listen to the incoming events on the caller s side.

C# events also simplify the act of registering the caller-side event handlers. Rather than having to specify custom helper methods, the caller simply makes use of the += and -= operators directly (which triggers the correct add_XXX() or remove_XXX() method in the background). When you wish to register with an event, follow the pattern shown here: // NameOfObject.NameOfEvent += new RelatedDelegate(functionToCall); // Car.EngineHandler d = new Car.CarEventHandler(CarExplodedEventHandler) myCar.Exploded += d; When you wish to detach from a source of events, use the -= operator, using the following pattern // NameOfObject.NameOfEvent -= new RelatedDelegate(functionToCall); // myCar.Exploded -= d; Given these very predictable patterns, here is the refactored Main() method, now using the C# event registration syntax: class Program { static void Main(string[] args) { Console.WriteLine("***** Fun with Events *****\n"); Car c1 = new Car("SlugBug", 100, 10); // Register event handlers. c1.AboutToBlow += new Car.CarEngineHandler(CarIsAlmostDoomed); c1.AboutToBlow += new Car.CarEngineHandler(CarAboutToBlow); Car.CarEngineHandler d = new Car.CarEngineHandler(CarExploded); c1.Exploded += d; Console.WriteLine("***** Speeding up *****"); for (int i = 0; i < 6; i++) c1.Accelerate(20); // Remove CarExploded method // from invocation list. c1.Exploded -= d; Console.WriteLine("\n***** Speeding up *****"); for (int i = 0; i < 6; i++) c1.Accelerate(20); Console.ReadLine(); } public static void CarAboutToBlow(string msg) { Console.WriteLine(msg); } public static void CarIsAlmostDoomed(string msg)

When the preceding code executes for our user action, the second case matches so the user object is loaded and then our user action is executed. The information that the comment hook knows about (for example, the comment s subject) is passed along to the action in the $context parameter. Note how the action looks for the user s ID first in the object and then the context, and finally falls back to the global $user: /** * Blocks the current user. * * @ingroup actions */ function user_block_user_action(&$entity, $context = array()) { if (isset($entity->uid)) { $uid = $entity->uid; } elseif (isset($context['uid'])) { $uid = $context['uid']; } else { global $user; $uid = $user->uid; }