Creating Session Beans - презентация, доклад, проект скачать

Нажмите для полного просмотра!

Содержание ▲

Вы можете ознакомиться и скачать презентацию на тему Creating Session Beans. Доклад-сообщение содержит 21 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

Слайд 1

Описание слайда:

Creating Session Beans

Слайд 2

Описание слайда:

Objectives After completing this lesson, you should be able to: Describe session beans Create stateless and stateful session beans by using annotations Understand the passivation and activation of stateful session beans Use interceptor methods and classes

Слайд 3

Описание слайда:

What Is a Session Bean? A session bean is a type of Enterprise JavaBean (EJB) that: Implements a business process Represents a client/server interaction Has a short lifespan Lives in memory rather than in persistent storage Is used to create a session facade

Слайд 4

Описание слайда:

Stateless Versus Stateful Session Beans There are two types of session beans: Stateless session bean (SLSB) Conversation is contained in a single method call. Business process does not maintain client state. Stateful session bean (SFSB) Conversation may invoke many methods. Business processes can span multiple method requests, which may require maintaining state.

Слайд 5

Описание слайда:

Life Cycle of a Stateless Session Bean

Слайд 6

Описание слайда:

Creating a Stateless Session Bean To create a stateless session bean: Define the stateless session bean. Define the local and remote interfaces (as needed).

Слайд 7

Описание слайда:

Define the Stateless Session Bean

Слайд 8

Описание слайда:

Create the Remote and Local Interfaces

Слайд 9

Описание слайда:

Create a Test Client for the SLSB

Слайд 10

Описание слайда:

Life Cycle of a Stateful Session Bean

Слайд 11

Описание слайда:

Слайд 12

Описание слайда:

Passivation and Activation Concepts Passivation and activation are stages in a session bean’s life cycle controlled by the EJB container: Passivation Serializes the bean state to secondary storage Removes the instance from memory Activation Restores the serialized bean’s state from secondary storage Creates a new bean instance or uses a bean from the pool (initialized with the restored state)

Слайд 13

Описание слайда:

Creating a Stateful Session Bean To create a stateful session bean: Define the stateful session bean. Define the local and remote interfaces (as needed).

Слайд 14

Описание слайда:

Define the Stateful Session Bean

Слайд 15

Описание слайда:

Create the Remote and Local Interfaces

Слайд 16

Описание слайда:

Create a Test Client for the SFSB

Слайд 17

Описание слайда:

Interceptor Methods and Classes EJB 3.0 introduces the ability to create custom interceptor methods and classes that are called before invoking the methods they intercept. Interceptors: Are available for only session beans (stateless and stateful) and message-driven beans Provide more granular control of a bean’s method invocation flow Can be used to implement custom transaction or security processes instead of having those services provided by the EJB container Are a new feature whose implementation details are not fully defined and are subject to change

Слайд 18

Описание слайда:

Interceptor Method

Слайд 19

Описание слайда:

Interceptor Classes External interceptor classes can be created to abstract the behavior of interceptors and to define multiple interceptors for a bean.

Слайд 20

Описание слайда:

Summary In this lesson, you should have learned how to: Describe session beans Create stateless and stateful session beans by using annotations Understand the passivation and activation of stateful session beans Use interceptor methods and classes

Слайд 21

Описание слайда:

Practice 5 Overview: Creating Session Beans This practice covers the following topics: Using JDeveloper to generate ServiceRequestFacade as a stateless session facade for entities Creating a Java client application for testing the session facade functionality