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Delegation pattern Delegation in object-based systems is a powerful way to handle the problem of extending an object s functionality without inheritance (see section 5.2.1 if you need to refresh your knowledge of OO terminology). Delegation lets you achieve some specialization through code reuse. As Gamma et al point out, inheritance enables a being relationship between a parent and child class, whereas delegation is a have relationship: one class would have or contain another class (this is sometimes referred to as an is a or has a relationship). You implement delegation by having the main class keep a pointer to the delegation class instance, which it uses to access methods in the delegation class. Instead of inheriting operations from a parent, the class passes requests to its delegate through its pointer. Other design patterns use delegation, including the State, Strategy, and Visitor patterns (see Gamma for a description of how delegation is used in these patterns). Cocoa implements delegation using Objective-C s delegation services. For example, to implement it in Interface Builder, follow these steps:
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Create two new classes: one for the delegate class (MyDelegate) and one for the class that holds the delegate pointer (MyHolder). Add an outlet (data member) to the MyHolder class for the delegate class pointer and create the MyHolder class files and instance. Open the Instances pane and Control-drag from MyHolder to MyDelegate, select the outlet that holds the pointer, and click the Connect button. Create the files and instance for MyDelegate. You will need to implement the delegation code in the delegate class from within Project Builder.
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Chain of Responsibility pattern Object-based systems define properties and behavior in classes, which are instantiated into objects at runtime. As a program runs, its objects interact by sending messages to one another that request services or perform a particular action. In some cases, the sender explicitly knows what object should handle its request. For example, the following code sends a display message to the receiver object:
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[myPictView display];
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In this case, the caller knows the receiver object. However, what if the caller does not know who should handle the message, but would rather send the message to a set of objects and let them decide who should handle the request
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Let s relate this question to a real-world example. Imagine you head a development group consisting of three teams. The first team is the least experienced and handles basic coding issues. The next team handles issues that are more advanced, and the third team is responsible for designing and implementing advanced features. You need a new feature added to the program, so you send a message to the first team. They discover that the addition requires more experience than they possess and forward the message to team two, who determine that it will require some design changes as well as more advanced coding experience. They forward the request to the third team, who implement the feature. In this case, you sent the original message with the understanding that the team best able to implement the feature should do so; you really do not care what group performs the implementation. Effectively, the teams form a chain of responsibility, where each is responsible for either handling requests they are suited for or forwarding the request along the chain. This example demonstrates the basic principles of the Chain of Responsibility design pattern, which breaks the link between the sender of a message and the specific object that will handle the request. It replaces this link with a more general semantic that says the message should be handled by the most capable object in the chain. This pattern is used in the Cocoa frameworks in its handling and routing of messages to windows and views. For example, if you click on an active object (say, a button) in a view, that view becomes the first responder. If that view contains a method to handles the event, it handles the request. Otherwise, it passes the event to the next object in the chain. The next object either handles the request or forwards it up the chain. This process continues until one of the objects handles the message or the message falls off the end of the chain and is not handled.
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