Term
What is the Singleton design pattern? |
|
Definition
| Creates a single instance of a class. |
|
|
Term
| What is the Factory design pattern? |
|
Definition
| Creates objects without exposing the instantiation logic to client, refers to objects through a common interface. |
|
|
Term
What is the Session Facade design pattern?
(like Business Delegate) |
|
Definition
| Encapsulates business services and exposes their interface. |
|
|
Term
| What is the Service Locator design pattern? |
|
Definition
| Used to locate various services using JNDI lookup. |
|
|
Term
| What is the DAO design pattern? |
|
Definition
| Abstracts (the rules) and encapsulates (restricts) all access to the data source. |
|
|
Term
| What is the Front Controller design pattern? |
|
Definition
| It centralizes the access logic and separates it from the view layer. (Struts) |
|
|
Term
| What is the Model 1 design pattern? |
|
Definition
| Distributes business logic across the JSP pages of an application. |
|
|
Term
| What is the Model 2 (MVC) design pattern? |
|
Definition
Divides the application into three layers.
(Model, View, and Controller) |
|
|
Term
| What is the Business Delegate design pattern? |
|
Definition
| Encapsulates access to the business service. |
|
|
Term
| How is business delegate and session facade different? |
|
Definition
- Business Delegate: always local to the client, and it hides remoteness.
- Session facade: can be remote (doesn't have to be) but it cannot hide remoteness. |
|
|
