August 2009
Intermediate to advanced
281 pages
6h 50m
English
Content preview from Professional PHP Design Patterns
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12.2. UML
This Unified Modified Language (UML) diagram details a class design using the Mediator Design Pattern (see Figure 12-1), which is described in the following list:
Figure 12-1. Figure 12-1
Two similar classes exist in this diagram: MyObjectA and MyObjectB. Both classes appear the same externally. They may differ in their identifier, represented by the private variable named identifier. Both function similarly.
During object creation, an instance of MyObjectMediator gets stored internally. Then, if a change is requested of the object by calling the public method changeIdentifer(), the parameter newID is applied to the object by updating the private identifier string. Then, the protected method notifyMediator() is called to apply the mediation to the rest of the objects.
MyObjectMediator is a hub for a list of objects. These are stored in the array MyObjectsToMediate. When MyObjectMediator is notified, the myObjectChanged() method is executed. This is responsible for parsing the array MyObjectsToMediate and applying the change to each of the other objects.
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