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J2EE Design Pattern - Part 2BY: Arivuvel Ramu | Category: Technology | Submitted: 2010-07-10 06:53:42
Presentation Tier Patterns Intercepting Filter Facilitates preprocessing and post processing of a request. Front Controller Provides a centralized controller for managing the handling of a request. View Helper Encapsulates logic that is not related to presentation formatting into helper components. Composite View Creates an aggregate view from atomic subcomponents Service To Worker Combines a Dispatcher component with the Front Controller and view helper patterns Dispatcher View Combines a Dispatcher component with the Front controller and view helper patterns, differing many activities to view processing. Context Object To Encapsulate state in a protocol independent way. Application Controller To Centralize retrieval and invocation of request processing components Business Tier Patterns Business Delegate Decouples presentation and service tiers, and provides a façade and proxy interface to the services. Value Object Facilitates data exchange between tiers by reducing network chattiness Session Façade Hides business object complexity; centralizes workflow handling Composite Entity Represents a best practice for designing coarse grained entity beans by grouping parent dependent objects into a single entity bean Value Object Assembler Assembles a composite value object from multiple data sources Value List Handler Manages query execution, results caching and results processing Service Locator Encapsulates complexity of business service lookup and creation; locates business services factories. Business Object To separate business data and logic using an object model Application Service To Centralize and aggregate behavior to provide a uniform service layer Integration Tier Pattern Data Access Object Abstracts data sources; provides transparent access to data Service Activator Facilitates asynchronous processing for EJB Components Domain Store To Separate persistence from the object model Web Service Broker To expose and broker one or more services using XML and web protocols. Article Source: http://www.saching.com/ About Author / Additional Info: Arivuvel Ramu Technical Architect (SOA) GalaxESolutions Comments on this article: (0 comments so far)
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