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8th March 2016, 03:56 PM
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J2EE Design Patterns
Hello sir I am here as I want to get the J2EE Design Patterns of AllAppLabs[dot]com so will you please provide me the same for me??
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#2
8th March 2016, 03:57 PM
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Re: J2EE Design Patterns
A Design Patterns describe an optimal solution to a common recurring design problem within a specific context. Characteristics of Design Patterns -Patterns are observed through experience. -Patterns are typically written in a structured format. -Patterns prevent reinventing the wheel. -Patterns exist at different levels of abstraction. -Patterns undergo continuous improvement. -Patterns are reusable artifacts. -Patterns communicate designs and best practices. -Patterns can be used together to solve a larger problem. -Patterns have their own pros and cons Design patterns have a number of advantages like - 1. Once described, any level engineer can use the pattern. 2. They allow for reuse without having to reinvent in every a project. 3. They allow to better define system structure. 4. They provide a design vocabulary. 5. They provide reusable artifacts. 6. Patterns can form frameworks that can then be used for implementations. Here as per your demand I am providing you J2EE Design Patterns of AllAppLabs[dot]com Intercepting Filter: Facilitates preprocessing and post-processing of a request Front Controller: Provides a centralized controller for managing the handling of requests. Composite View: Creates an aggregate View from atomic subcomponents. View Helper: Encapsulates logic that is not related to presentation formatting into Helper components. Dispatcher View: Combines a Dispatcher component with the Front Controller and View Helper patterns, deferring many activities to View processing. Service to Worker: Combines a Dispatcher component with the Front Controller and View Helper patterns Business Delegate: Reduces coupling between presentation-tier clients and business services. It hides the underlying implementation details of the business service, such as lookup and access details of the EJB architecture. Session Facade: Encapsulate the complexity of interactions between the business objects participating in a workflow. The Session Facade manages the business objects, and provides a uniform coarse-grained service access layer to clients. Service Locator: Multiple clients can reuse the Service Locator object to reduce code complexity, provide a single point of control, and improve performance by providing a caching facility. Transfer Object Assembler: It is used to build the required model or submodel. The Transfer Object Assembler uses Transfer Objects to retrieve data from various business objects and other objects that define the model or part of the model. Value List Handler: The most critical concern in a distributed paradigm is the latency time. Value List Handler Pattern suggests an alternate approach of using ejb-finder methods. The pattern is used to control the search, cache the results and provide the results to the client using a lightweight mechanism. Composite Entity: It model, represent, and manage a set of interrelated persistent objects rather than representing them as individual fine-grained entity beans. A Composite Entity bean represents a graph of objects. Transfer Object: Encapsulate the business data. A single method call is used to send and retrieve the Transfer Object. When the client requests the enterprise bean for the business data, the enterprise bean can construct the Transfer Object, populate it with its attribute values, and pass it by value to the client. Service Activator: Service Activator enables asynchronous access to enterprise beans and other business services. It receive asynchronous client requests and messages. On receiving a message, the Service Activator locates and invokes the necessary business methods on the business service components to fulfill the request asynchronously. In EJB2.0, Message Driven beans can be used to implement Service Activator for message based enterprise applications. The Service Activator is a JMS Listener and delegation service that creates a message façade for the EJBs. Data Access Object: Abstracts and encapsulate all access to the data source. The DAO manages the connection with the data source to obtain and store data. Contact Details: AllAppLabs[dot]com 830 Pacheco Dr Milpitas CA 95035 |