Integration of Spring with Blaze DS and Cairngorm UM

Deepdive by N.S.Devaraj

Agenda for this season What is Spring? Why Spring with Flex? Why Spring BlazeDS Integration? What is & Why Cairngorm UM? What is & why generic DAO? What is & Why CairnSpring?

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WHAT IS SPRING?

The result is looser coupling between components. The Spring IoC container has

proven to be a solid foundation for building robust enterprise applications.

The components managed by the Spring IoC container are called Spring beans.

WHAT IS SPRING?

The Spring framework includes several other modules in addition to its core IoC

container. http://www.springframework.org.

WHY WE NEED FLEX ACCESS SPRING?

In scenario of the Remoting and Data Management Services approaches:

It enable the tightest integration with Spring. There is no need to transform

data, or to expose services in a certain way: the Flex application works directly

with the beans registered in the Spring IoC container.

WHY WE NEED FLEX ACCESS SPRING?

The BlazeDS Remoting enables binding your valueobjects with Java pojo Classes easily

by metadata [RemoteClass(alias=”com.adobe.pojo.ob”]

By using the Spring Security 2.0 we can make our application secured for

transactions.

Browser or AIR .swf

application

ServiceProxy

RemoteProcedure

CallsMessaging

domain http(s)

blazeds server

External Services

WHAT is BlazeDS?BlazeDS provides a set of services that lets you connect

a client-side application to server-side data, and pass data among multiple clients connected to the server. BlazeDS implements real-time messaging between

clients.

domain

/{context}/messagebroker/*servlet

.classconfig

.jarlibrary.jar

library

proxy-config.xmlconfig

messaging-config.xmlconfig

remote-config.xmlconfig

services-config.xmlconfig

core

flex

LibClasses

BlazeDS Server

SPRING BLAZEDS INTEGRATIONWEB.XML

Spring BlazeDS Integration servlet

<servlet>

<servlet-name>spring-flex</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/flex-servlet-context.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

Mapping Spring BlazeDS Integration servlet to handle all requests to '/spring/*

<servlet-mapping>

<servlet-name>spring-flex</servlet-name>

<url-pattern>/spring/*</url-pattern>

</servlet-mapping>

Example:

SPRING BLAZE DS EXAMPLE

flex-servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:flex="http://www.springframework.org/schema/flex" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/flexhttp://www.springframework.org/schema/flex/spring-flex-1.0.xsd">

<context:component-scan base-package="org.springbyexample.web.service" />

<flex:message-broker/> ----Spring BlazeDS Integration configuration of the BlazeDS message broker, which handles remoting and messaging requests.

<flex:remoting-destination ref="personDao" /> ---Exposes the personDao bean as a BlazeDS remoting destination

</beans>

TRADITIONAL BLAZE DS WAY

The BlazeDS configuration first imports the 'remoting-config.xml',The parameters in the URL 'server.name' and 'server.port' are supplied by the Flex runtime. The 'context.root' parameter needs to be supplied during compilation using the 'context-root' compiler option.services-config.xml

<?xml version="1.0" encoding="UTF-8"?><services-config> <services> <service-include file-path="remoting-config.xml" /> <default-channels> <channel ref="person-amf"/> </default-channels> </services> <channels> <channel-definition id="person-amf" class="mx.messaging.channels.AMFChannel"> <endpoint url="http://{server.name}:{server.port}/{context.root}/spring/messagebroker/amf" class="flex.messaging.endpoints.AMFEndpoint"/> </channel-definition> </channels> </services-config>

SPRING BLAZEDS INTEGRATION PersonService.java

@Service@RemotingDestinationpublic class PersonService { private final PersonDao personDao; /** * Constructor */ @Autowired public PersonService(PersonDao personDao) { this.personDao = personDao; } public void remove(int id) { Person person = personDao.findPersonById(id); personDao.delete(person); }}

PersonDeleteCommand.as var ro:RemoteObject = new RemoteObject("personDao"); ro.remove(id); ro.addEventListener(ResultEvent.RESULT, updateSearch);

Cairngorm with UM Extensions Universal Mind Cairngorm Extensions

( UM – CGX is easy to migrate from CG) Event – Business logic combined together Command logic can be aggregated to

context-specific command classes (minimizes the number of classes)

Support for easy queue of delegate calls (SequenceGenerator)

Cairngorm with UM Extensions Create Responder in view Add responder to event Cache/Store responder from event to

command In Command, on success/failure call back

these responders On view handle success/failure to control

view states

Cairngorm with UM ExtensionsView Layer Model Layer Control Layer

View

ModelLocator

Command Delegate Servervia databinding

via IRespondertcp/ip

View Layer Business Layer

View Command Delegate Server

via IResponder via IRespondertcp/ip

via eventdispatching

via eventdispatching

MVC Classic Usage

Using View Notifications

MVC Classic Usage

J2EE – DAO INTRODUCTION All database access in the system is made

through a DAO to achieve encapsulation. Each DAO instance is responsible for one

primary domain object or entity. If a domain object has an independent lifecycle, it should have its own DAO.

The DAO is responsible for creations, reads (by primary key), updates, and deletions -- that is, CRUD -- on the domain object.

generic DAO For creating a new DAO we need →a Hibernate mapping file, a plain old Java interface, and 10 lines in your Spring configuration

file.

Resource:http://www.ibm.com/developerworks/java/library/j-

genericdao.html

CairnSpring

The CairnSpring includes both Caringorm UM, Generic DAO along with the Spring BlazeDS

Integration.

It also enables Paging request.

http://www.code.google.com/p/cairnspring

QUESTIONS