By Alexander Shvets
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Additional resources for Design Patterns Explained Simply
Identify a simpler, unified interface for the subsystem or component. 2. Design a 'wrapper' class that encapsulates the subsystem. 3. The facade/wrapper captures the complexity and collaborations of the component, and delegates to the appropriate methods. 4. The client uses (is coupled to) the Facade only. 5. Consider whether additional Facades would add value. Facade | 49 Rules of thumb Facade defines a new interface, whereas Adapter uses an old interface. Remember that Adapter makes two existing interfaces work together as opposed to defining an entirely new one.
Polymorphic creation is now possible. Example The Factory Method defines an interface for creating objects, but lets subclasses decide which classes to instantiate. Injection molding presses demonstrate this pattern. Manufacturers of plastic toys process plastic molding powder, and inject the plastic into molds of the desired shapes. ) is determined by the mold. Factory Method | 53 Check list 1. If you have an inheritance hierarchy that exercises polymorphism, consider adding a polymorphic creation capability by defining a static factory method in the base class.
A Command class holds some subset of the following: an object, a method to be applied to the object, and the arguments to be passed when the method is applied. The Command's "execute" method then causes the pieces to come together. Sequences of Command objects can be assembled into composite (or macro) commands. Structure The client that creates a command is not the same client that executes it. This separation provides flexibility in the timing and sequencing of commands. Materializing commands as objects means 32 | Command they can be passed, staged, shared, loaded in a table, and otherwise instrumented or manipulated like any other object.