tailieunhanh - Mastering Web Services Security p6

và giá trị trả lại, và giấu các chi tiết cụ thể của việc thực hiện Box cụ thể nào đó. Đối tượng bộ chuyển đổi. Ngồi trên đầu trang của các nhà môi giới yêu cầu đối tượng (Box) và chấp nhận yêu cầu thay mặt cho các đối tượng của máy chủ. Nó cung cấp môi trường thời gian chạy cho instantiating đối tượng máy chủ, | Security of Infrastructures for Web Services 209 They enable enterprise beans to be ported to another environment with minimal effort. They are interoperable with other EJB products. Fully compliant EJB products support the IIOP protocol leveraging IIOP and CSIv2 capabilities and allowing CORBA clients that can be written in languages other than Java to access enterprise bean objects. EJB architecture has the following basic parts as illustrated in Figure Enterprise bean. A special Java component that implements business logic executed in the runtime environment provided by the component s container. EJB container. Where the EJB component lives. An EJB container provides services such as transaction and resource management versioning scalability mobility persistence and security to the enterprise beans it contains. Multiple enterprise beans typically exist inside a single container. EJB server. Provides runtime environment to one or more containers. Since EJB does not explicitly define the separation of roles between containers and servers containers and servers usually come inseparable in one system. Remote interface. The remote interface of an enterprise bean represents the bean s business logic to remote clients. That is the clients access the bean business logic via its remote interface. EJB object. Provided by the container and serving as an interception point where most of the work for serving the bean is done. Implements the remote interface on the way to the bean. Home interface. Provides factory methods that allow remote clients to request that an instance of an enterprise bean be created and initialized. Home object. Implements the methods specified in the home interface. Local interface and EJB local object. Provide local access to the bean from other enterprise beans running in the same container. Figure Main parts of EJB architecture. 210 Chapter 7 Declarative Part Defining remote home and local interfaces as well as implementing the business

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