TAILIEUCHUNG - EJB Introduction & Session Bean

Enterprise JavaBeans (EJB) is a managed, server-side component architecture for modular construction of enterprise applications. The EJB specification is one of several Java APIs in the Java EE specification. EJB is a server-side model that encapsulates the business logic of an EJB specification intends to provide a standard way to implement the back-end 'business' code typically found in enterprise applications (as opposed to 'front-end' interface code). Such code addresses the same types of problems, and solutions to these problems are often repeatedly re-implemented by programmers. | EJB Introduction & Session Bean Đào Anh Tuấn – datuan@ EJB Introdution – Định nghĩa Enterprise JavaBeans (EJB) is a platform for building portable, reusable, and scalable business applications using the Java programming language. From a developer’s point of view, an EJB is a piece of Java code that executes in a specialized runtime environment called the EJB container, which provides a number of component services Reusable: For example, you can implement the credit card–charging module as an EJB component that may be accessed by multiple applications Main strength: Multithreading Các dịch vụ EJB hỗ trợ Vai trò EJB trong mô hình layers Vị trí của EJB EJB Types: Consists of three types: Session Beans Message-Driven Beans Entity Beans Trong đó Session và Message-Driven Beans đảm nhiệm vai trò ở tầng Business, Entity Beans đảm nhiệm vai trò ở tầng Persistence J2EE Container EJB chỉ có thể thực thi trong các EJB Container J2EE container cung cấp cho người dùng nhiều dịch .

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