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??

[Shaleen]

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.

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