Architecting J2EE Application with Open Source Softwares with open source software architecture J2EE
The first principle A good J2EE application is first is a good Java application a good Java program is first a good object-oriented program.
What is a good J2EE app available (Robust) can be maintained, scalable (SCALABILITY) can be tested (Testability)
What is a good J2EE application (Migratability) can be multiplexed to support multiple clients (Multi-Client) simple (SIMPLCITY)
Heavy-weight vs. light-weight. Function is complete. The concept is complete. Support enriched. Simple and easy to use. High-pledge. Easy test
J2EE Application Typical Architecture Resource Layer (DAO) Data Source Data Service Layer (Service) Express CLIENT Aspects Object Object
Architecture strategy. Hierarchical. Each layer focuses on its own function, each layer can shield its own modification. Pojo. Avoid frame locking, easy to transplant and test. . AOP INFRASTRUCTURES. Use AOP to solve cross-cutting problems to avoid solving such problems through OO means.
Resource layer: O / R mapping entity bean Toplink Castor Hibernate
Select the standard concurrency and transaction of the ORM tool (support JTA) mapping capability (class level mapping, object-related mapping) package (storage mechanism, CRUD operation, database) legacy system and efficiency (cursor, non-object query, dynamic Inquire)
Business layer: Container EJB container Avalon Spring and PicoContainer
Business Floor: Infrastructure EJB Infrastructure AOP Solutions Differences: All-in-One vs. as-you-need up-front vs. on-demand
Business layer: infrastructure object system error handling security transaction control persistence log Remoting
AOP: Orthogonal Separation Concerns Some problems across multiple object systems, the solution is dispersed in multiple code segments, unable to abstract the object AOP to provide orthogonal modular ability OHA OHB OHC Aspect
Introduction to HESSIAN
Field: Thin Client VS. Rich Client Web Frame: Struts, Webwork, Velocity Rich Client: WebStart, Applet Folding: XMLHTTP
Basic principles Test the first POJO, get rid of the locking object-oriented strike
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