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Sun Java Center - J2EE Patterns

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Patterns
Patterns Roadmap

Here we present a list of common requirements that typically arise when designing and architecting a J2EE solution. We present a requirement or a motivation in a brief statement and then point you to one or more patterns that might address the requirement. While this requirements list is not exhaustive, we hope that it helps you to quickly identify the relevant patterns based on your needs.

Presentation Tier related:

*If you are looking for this:*	*Find it here:*
Doing preprocessing or post-processing of your requests	DecoratingFilter
Centralizing control for request handling	FrontController, DecoratingFilter
Adding logging, debugging, or some other behavior to be completed for each request	FrontController, DecoratingFilter
Creating a generic command interface for delegating processing from a controller to helper components	FrontController
Whether to implement your Controller as a servlet or JSP	FrontController
Creating a View from numerous sub Views	CompositeView
Whether to implement your View as a servlet or JSP	ViewHelper
How to partition your View and Model	ViewHelper
Where to encapsulate your presentation-related data formatting logic	ViewHelper
Whether to implement your Helper components as JavaBeans or Custom tags	ViewHelper
Combining multiple presentation patterns	Service To Worker, DispatcherView
Where to encapsulate View Management and Navigation logic, which involves choosing a View and dispatching to it	Service To Worker, DispatcherView

Business Tier related:

If you are looking for this:	Find it here:
Minimize coupling between presentation and business tiers	Business Delegate
Cache business services for clients	Business Delegate
Hide implementation details of business service lookup/creation/access	Business Delegate, ServiceLocator
Isolate vendor and technology dependencies for services lookup	ServiceLocator
Provide uniform method for business service lookup and creation	ServiceLocator
Hide the complexity and dependencies for enterprise bean and JMS component lookup	ServiceLocator
Transfer data between business objects and clients across tiers	Value Object
Minimize code duplication between entity beans and value object classes	Value Object
Provide simpler uniform interface to clients	BusinessDelegate
Reduce remote method invocations by providing coarse-grained method access to business tier components	Session Façade
Manage relationships between enterprise bean components and hide the complexity of interactions	Session Façade
Protect the business tier components from direct exposure to clients	Session Façade, BusinessDelegate
Provide uniform boundary access to business tier components	Session Façade
Design complex entity beans	Aggregate Entity
Identify coarse-grained objects and dependent objects for entity bean design	Aggregate Entity
Design for coarse-grained entity beans	Aggregate Entity
Reduce or eliminate the entity bean clients' dependency on the database schema	Aggregate Entity
Reduce or eliminate entity bean to entity bean relationships	Aggregate Entity, Session Façade
Reduce number of entity beans and improve manageability	Aggregate Entity
Obtain the data model for the application from various business tier components	Value Object Assembler
On the fly construction of the data model	Value Object Assembler
Hide the complexity of data model construction from the clients	Value Object Assembler
Provide query and list processing facility	Value List Handler
Minimize the overhead of using enterprise bean finder methods	Value List Handler
Provide query results caching for clients on the server side with forward and backward navigation	Value List Handler

Integration Tier related:

*If you are looking for this:*	*Find it here:*
Minimize coupling between business and resource tiers	Data Access Object
Centralize access to resource tiers	Data Access Object
Minimize complexity of resource access in business tier components	Data Access Object
Provide asynchronous processing for enterprise bean components	Service Activator
Send a message to an enterprise bean component	Service Activator

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