JAVA/JEE

Getting started with  IOC

After the object-oriented programming, software engineer must start with this very important lessons, before starting to study the JEE architecture.

Wikipedia currently defines a  dependency injection “is a software design pattern that implements inversion of control for software libraries. Caller delegates to an external framework the control flow of discovering and importing a service or software module. Dependency injection allows a program design to follow the dependency inversion principle where modules are loosely coupled. With dependency injection, the client part of a program which uses a module or service doesn’t need to know all its details, and typically the module can be replaced by another one of similar characteristics without altering the client.”

” An injection is the passing of a dependency (a service) to a dependent object (a client). The service is made part of the client’s state. Passing the service to the client, rather than allowing a client to build or find the service, is the fundamental requirement of the pattern.”

Functional Requirement

  • An application is created to respond, first, the functional requirement for client

Technical Requirement

  • Performance
  • Response time
  • High Availability
  • Avoid the scalability problem.

Maintenance

  • An application needs change over time.
  • Must be closed to change and open extension.
  • Security
  • Portability
  • distrubiation.
  • Service oriented architecture.
  • Ability to provide different types of customer service (mobile, http, desktop ..).
  • cost of software.
 It is difficult to develop a software system that meet these exigense without using the experience of the other.
Two architecture entreprise we should use it :
  • JEE Architecture
  • .Net Architecture

The developer only deals business code.

The framework takes care of the technical code.

 Two solutions for the JEE architecture :
  • Spring : lightweight container
  • EJB : heavyweight container

ORM (Object Relational Mapping) : Hibernate,JPA,TopLink..

Web application : Struts, JSF,Spring MVC

Middleware for distributed systems :

  • RMI,CORBA : distrubed application
  • JAXWS to the web service SOAP
  • JAXRS to the web service RESTful
  • JMS asynchronous communication between the Application

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