lightweight architecture

©2003First Consulting Group, Inc.

Lightweight ArchitectureLightweight Architecture

Issue Date: 03/10/2008

Author: Vu Tran

© FCG | Slide 2 FCG Internal/Restricted/Confidential Version: 1.0 | Issue Date: 03/10/2008

AgendaAgenda

Objectives Lightweight Architecture Overview each component (Struts 2, Tiles 2, Spring 2.5,

Hibernate 3.2) Demo Analysis the sample


ObjectivesObjectives

Opportunity from CSC Improve researchable, new technology Technologies bring you increase productivity and quality. Next action. …


Lightweight Architecture


Productivity and QualityProductivity and Quality

Increase Productivity Increase Quality Productivity Quality Technologies.

– Struts, JSF…– Spring…– Hibernate, EJB, Top Link, JPA, JDO …

Struts 2.x, Tiles 2.x, Spring 2.5.x, Hibernate 3.2.x


ArchitectureArchitecture

DAO Interface Implement Layer (Retrieves, save entities using ORM, JDBC)

DAO Interface Layer (Defines persistence operations, independent of implementing technology)

Business Services Layer: Expose key functionality. Manages Transaction boundaries, include business logic

Persistence Domain Object (entity)

JDBC

Database

Web tier action: Process user input, call service layer, choose view to display

Remote Service: Webservice or other

protocol

JSP: or other Generice HTML

Presentation Layer

Business Layer

DAO Layer


Technologies


Struts2Struts2

Apache Struts2 was originally known as WebWork 2. Goal of Struts2:

– To make web development easier for developer.– To reduce XML configuration (intelligent defaults, annotations, …)– Actions are now POJOs increases testability and reduces

coupling in the framework.– Spring, SiteMesh and Tiles integration.– OGNL expression language integration.– Themes based ta libraries and Ajax tags.– Multiple view options (JSP, Freemarker, Velocity, XSLT)


ConfigurationConfiguration

Web.xml

<filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.FilterDispatcher </filter-class> </filter>

<filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>



Struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="person" extends="struts-default"> <action name="list" method="execute" class="personAction"> <result>pages/list.jsp</result> <result name="input">pages/list.jsp</result> </action> <action name="save" method="save“ class="personAction"> <result>/home.jsp</result> <result name="input">pages/list.jsp</result> </action> </package></struts>


TilesTiles

What is Tiles?– To be a templating framework built to simplify the development of

web application user interfaces.– To define page fragments which can be assembled into a complete

page at runtime

Footer

Header

BodyLeftnav

Footer



Web.xml

<listener> <listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class> </listener> <context-param> <param-name> org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG </param-name> <param-value> /WEB-INF/tiles.xml </param-value> </context-param>



Tiles.xml

<?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN" "http://tiles.apache.org/dtds/tiles-config_2_0.dtd"><tiles-definitions> <definition name="myapp.homepage" template="/template/layout.jsp"> <put-attribute name="title" value="everyone" /> <put-attribute name="header" value="/include/header.jsp" /> <put-attribute name="footer" value="/include/footer.jsp" /> </definition> <definition name="myapp.homepage.home" extends="myapp.homepage"> <put-attribute name="detail" value="/pages/detail.jsp" /> <put-attribute name="list" value="/pages/list.jsp" /> </definition></tiles-definitions>


JSP fileJSP file

JSP file:

<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %><tiles:insertDefinition name="myapp.homepage.home" />


Spring


SpringSpring

What is Spring? – Spring is an open source framework for developing enterprise

application. – Spring is a light-weight framework for the development of

enterprise-ready applications – Spring can be used to configure declarative transaction

management, remote access to your logic using RMI or web services, mailing facilities and various options in persisting your data to a database.

– Spring framework can be used in modular fashion; it allows using in parts and leaving the other components, which is not required by the application.


SpringSpring

What are features of Spring?– Lightweight– Inversion of control (IOC)– Aspect oriented (AOP)– Container– MVC Framework– Transaction Management– JDBC Exception Handling


SpringSpring



SpringSpring

What are modules of Spring?– The core container– Spring context – Spring AOP – Spring DAO – Spring ORM – Spring Web module – Spring MVC framework


SpringSpring



SpringSpring

What is BeanFactory?– A BeanFactory is like a factory class that contains a collection of

beans. The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whenever asked for by clients.

BeanFactory is able to create associations between collaborating objects as they are instantiated. This removes the burden of configuration from bean itself and the beans client.

BeanFactory also takes part in the life cycle of a bean, making calls to custom initialization and destruction methods.


SpringSpring

What is Application Context?– Like BeanFactory, load bean definitions, wire beans together, and

dispense beans upon request. But it also provides: A means for resolving text messages, including support for

internationalization. A generic way to load file resources. Events to beans that are registered as listeners.


SpringSpring

Application Context config file

sa


Hibernate


HibernateHibernate

What is hibernate?– A pure Java object-relational mapping (ORM) and persistence

framework. Why do you need a tool like Hibernate?

– Improved productivity High-level object-oriented API Less Java code to write No SQL to write

– Improved performance Sophisticated caching Lazy loading Eager loading

– Improved maintainability A lot less code to write

– Improved portability ORM framework generates specific DB script for you.


HibernateHibernate

What does Hibernate simplify?– Saving and retrieving your domain objects– Making DB column and table name changes– Complex joins for retrieving related items– Schema creation from object model

Core Hibernate Framework– Session– SessionFactory– Configuration– Transaction– Query and Criteria


HibernateHibernate

Session– A single threaded, short-lived object representing a conversation

between application and the persistent store.– Session role

Wraps a JDBC connection Factory for Transaction Holds a mandatory cache of persistent objects, used when navigating

the object graph or looking up objects by identifier

– Session session = sessionFactory.openSession(); SessionFactory

– There is a single SessionFactory for the whole application and created during application initialization

– Cache session object– Cache generate SQL statements and other mapping metadata that

Hibernate uses at runtime– Cached data that has been read in one unit of work and may be

reused in a future unit of work


HibernateHibernate

Flow of Hibernate communication with RDBMS?– Load the Hibernate configuration file and create configuration

object. It will automatically load all hbm mapping files – Create session factory from configuration object – Get one session from this session factory – Create HQL query – Execute query to get list containing Java objects



hibernate.cfg.xml

<hibernate-configuration><session-factory><property name="connection.url">jdbc:mysql://localhost/tranquang?useUnicode=true&characterEncoding=UTF-8</property><property name="connection.username">root</property><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="dialect">org.hibernate.dialect.MySQLDialect</property><property name="connection.password"></property><property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property><property name="connection.pool_size">10</property><property name="current_session_context_class">thread</property><property name="show_sql">false</property><property name="hbm2ddl.auto">update</property></session-factory></hibernate-configuration>


Demo


DeploymentDeployment

JDK5 Ajax: jquery Struts2 Tiles2 Spring2.5 Hibernate3.2 Server: Jetty

Thank You

lightweight architecture

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