|
Term |
Description/Definition |
Used in |
|
BMP |
Bean managed persistence: a strategy for entity beans where the bean developer implements the persistence logic for entity beans. |
Business tier patterns |
|
Business Object |
An object that implements business logic and/or business data. Business data and business logic are implemented in coarse-grained objects called Business Objects. In J2EE, business objects are implemented as session or entity beans. In some cases, a business object could be an arbitrary Java object that provides some service. |
Business tier patterns |
|
CMP |
Container managed persistence: a strategy for entity beans where the container services transparently manage the persistence of entity beans. |
Business tier patterns |
|
Composite |
A complex object that holds other objects. Also related to the Composite pattern described in the GoF book. (See GoF below.) |
Composite View,
Aggregate Entity |
|
Controller |
Interacts with a client, controlling and managing the handling of each request. |
Presentation tier patterns, Business Tier |
|
Data Access Object |
An object that encapsulates and abstracts access to data from a persistent store or an external system. |
Business and Integration tier patterns |
|
Delegate |
A stand-in for another component, an intermediate layer. A Delegate has qualities of a Proxy and Façade. |
Business Delegate and many other patterns |
|
Dependent Object |
An object that does not exist by itself and whose lifecycle is managed by another object. |
Aggregate Entity pattern |
|
Dispatcher |
Managing the choice of and dispatching to an appropriate View are some of the responsibilities of a Controller. This behavior may be partitioned into a separate component, referred to as a Dispatcher. |
Dispatcher View,
Service To Worker |
|
Enterprise Bean |
An instance of an Enterprise JavaBean component; can be a session or entity bean instance. When this term is used, it means that the bean instance can be either an entity or a session bean. |
Many places in this literature |
|
Entity Bean |
Refers to an instance of an entity bean. May also refer collectively to the entity bean's home, remote object, bean implementation, or primary key objects. |
Many places in this literature |
|
Façade |
A pattern to hide the complexities described in the Design Patterns book by Gamma et al. |
Session Façade pattern |
|
Factory (Abstract Factory or Factory Method) |
Patterns described in the GoF book for creating objects or families of objects. |
Business tier patterns:Data Access Object,
Value
Object |
|
Front |
Same as Controller. (The 'Front' name was introduced in the Sun J2EE Blueprints.) |
Presentation tier patterns
|
|
Iterator |
A pattern to provide collection facility described in the GoF book. |
Value List Handler |
|
GoF |
Gang of Four--refers to the authors of the popular Design Patterns book (Gamma, Helm, Johnson, Vlissides) |
Many places in this literature |
|
Helper |
Responsible for helping the Controller and/or View. For example, the Controller and View may delegate the following to a Helper: content retrieval, validation, storing the model or adapting it for use by the display. |
Presentation tier patterns,
Business delegate |
|
Independent Object |
An object that can exist by itself and may manage the lifecycles of its dependent objects. |
Aggregate Entity pattern |
|
Locator |
An object that aids in locating service and business objects. |
Service Locator pattern |
|
Model |
A physical or logical representation of the system or its sub-system. |
Presentation and Business tier patterns |
|
Persistent Store |
Represents persistent storage systems such as RDBMS, ODBMS, a file system, and so forth. |
Business and Integration tier patterns |
|
Scriptlet |
Application logic embedded directly within a JSP. |
Presentation tier patterns |
|
Session Bean |
Refers to an instance of a session bean. May also refer collectively to the session bean's home, remote object, or bean implementation. |
Business tier patterns |
|
Singleton |
A pattern that provides a single instance of an object, as described in the GoF book. |
Many places in this literature |
|
Template |
Template text refers to the literal text encapsulated within a JSP View. Additionally, a template may refer to a specific layout of components in a display. |
Presentation tier patterns |
|
Value Object |
An arbitrary Java object that is used to carry data from one object/tier to another. Usually does not contain any business methods. May be designed with public attributes or provided with get methods to obtain attribute values. |
Business tier patterns |
|
View |
The view manages the graphics and text that make up the display. It interacts with Helpers to get data values with which to populate the display. Additionally, it may delegate activities, such as content retrieval, to its Helpers. |
Presentation tier patterns |
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