Overview of atg framework

AGENDA
What is E-Commerce & m-commerce
Different frameworks/platforms providing e-commerce solutions
Overview of Oracle ATG
Different modules provided by Oracle ATG Commerce
Nucleus
Different Oracle ATG Components

E-COMMERCE & M-COMMERCE
Distributing, Buying, Selling and marketing products and services
over internet through which transaction or terms of sale are
performed electronically.
Types of E-Commerce
 B2B(Applies to businesses buying from and selling to each other. E.g.
Walmart)
 B2C(Applies to business that sells its products or services to consumers.
E.g. flipkart)
 C2B(Applies to any consumer that sells a product or service to a business. )
 C2C(Applies to sites primarily offering goods and services to assist
consumers interacting with each other. E.g. olx)

CONCEPTUAL VIEW OF E-
COMMERCE

FRAMEWORKS PROVIDING E-
COMMERCE SOLUTIONS
Oracle ATG Commerce
SAP Hybris
IBM WCS
Magneto

ART TECHNOLOGY GROUP (ATG)
Web Commerce Application
Highly scalable and flexible component-based architecture.
E-commerce software solutions & On-demand commerce
optimization applications.
Co-founded by Jeet Singh & Joseph Chung in 1991.
ATG’s solutions provide merchandising, marketing, content
personalization, automated recommendations.
Acquired by Oracle in 2005.
The latest version of Oracle ATG Commerce is 11, which includes the
integration support of REST MVC framework, Endeca Experience
Manager.

ATG PLATFORM
ATG platform is built on “layered” and “modular” approach.
ATG Web Commerce applications implement a component
development model based on Java Beans and JSP
The core of ATG platform is it’s Application framework i.e. Dynamo
Application Framework (DAF).
DAF runs on top of the application server (like weblogic, websphere
etc..) and provides essential facilities for application development and
deployment.

ARCHITECTURE OF ORACLE ATG
BASED APPLICATION.

APPLICATIONS IN ORACLE
COMMERCE
Commerce
Personalization
Merchandising
Business Control Center
Customer Service Center
Endeca Commerce & Experience Manager

DIFFERENT MODULES AVAILABLE IN
ATG
DPS
 Personalization module
 Used to create and maintain user profiles
 User specific business rules
DCS
 Core Commerce Module
 Provides the commerce capabilities like Shopping Cart, Order Purchase &
Checkout.

CONTD..
DSS
 Extends the targeting capabilities of DPS
 Scenarios are event driven
 Designed to manage interaction between the site visitor and content
DCC
 Provides developer with the tool “ACC”
B2BCommerce
B2CCommerce
DCS.CustomCatalogs
Fulfillment
DAS-UI

KEY CONCEPTS
Component Centric Model
MVC2 framework
Dependency Injection
Modular approach
Data Anywhere Architecture (Similar to ORM)

COMPONENT DEVELOPMENT
MODEL
What is a Component?
Examples of Component Architecture
 Microsofts COM/DCOM
 Java Beans
 CORBA
Benefits of Component Development Model
 Code Reusability
 Reduced Development time
 Continuous, Incremental improvements

COMPONENT IN ATG
Any simple Java Class can be treated as a “Component”.
To define a component in ATG, we need to create .properties file in
the corresponding config directory.
E.g. public class MyComponent{ } ->
src/com/dev/MyComponent.java
Create a .properties file in the corresponding config directory
i.e. config/com/dev/MyComponent.properties
The properties file contains the class name and the scope of the
component (request/session/global)

DYNAMO APPLICATION
FRAMEWORK
DAF is the core of Oracle ATG Web Commerce
It runs on top of the application server
It provides a Component Development Environment.
Supplies essential facilities for application development and
deployment
 Nucleus
 Repositories
 Droplets
 FormHandlers
 Tag Libraries

NUCLEUS
Dynamo’s Open Object Framework
Central registry for the java beans which contains our application
level logic.
Creates and configures the components
Organizes them into a hierarchical namespace

FORM HANDLER
Specialized Nucleus Components
Can be embedded into JSPs to do form validation and based on the
result perform actions like submitting user data, forwarding the user
to some other pages
Form handler components have handleXXX() methods, which takes
care of appropriate handler logic based on user action.
Some of the mostly used OOTB form handlers are
ProfileFormHandler, CartModifierFormHandler,
CommitOrderFormHandler etc..

DROPLET
Specialized Nucleus components which are used to display dynamic
content on the JSP pages
Also known as “Dynamo Servlet Beans”
Java Developers and Page designers can work independently and
applications are easier to maintain
OOTB droplets are ItemLookupDroplet, ForEach, Switch etc..

REPOSITORIES
Data Access layer that defines generic representation of data store
Data Anywhere Architecture (DAA) provides a unified view of content
and data
Core of DAA is “Repository API”
Using Repository API, we can employ a single approach to accessing
different data types, including SQL databases, LDAP directories,
content management systems and file systems

HIGH LEVEL OVERVIEW OF DAA
Advantages
 Data Source Independence
 Maximum Performance
 Simplified transactional control
 Fine-grained Access Control

TAG LIBRARIES
Earlier the presentation language used is “JHTML”
JHTML has lots of custom tags to access Dynamo Components
JSP became the defacto language for Presentation tier
Introduced to access Nucleus components and render dynamic
content from JSP files
Example tags include <dsp:form>, <dsp:input>,<dsp:valueof>,
<dsp:a>, <dsp:getvalueof> etc..

DROPLETS
To display the dynamic content on JSP pages using nucleus
components.
We can embed the output of a nucleus component using dsp tag
libraries
e.g. <dsp:droplet name=“/atg/dynamo/ForEach>
<dsp:param name=“array”
bean=“/com/sample/Student.subjects/>
<dsp:oparam name=“output”>
<dsp:valueof param=“element”/>
</dsp:oparam>

CONTD…
Each droplet has a predefined set of parameters that control
it’s behavior
 Input
 Output
 Open
Input parameters are passed into the droplet
e.g. <dsp:param name=“array” bean=“/com/sample/Student.subjects/>
Output parameters are set by the droplet
e.g. <dsp:valueof param=“element”/>
Open parameters specify code to execute at different stages of servlet
processing
Content that needs to be displayed before output is displayed using
outputStart <dsp:oparam name=“outputStart”> …. </dsp:oparam>
<dsp:oparam name=“output”>……</dsp:oparam>
Content that needs to be displayed before output is displayed using

CONTD..
Some of the OOTB droplets
<dsp:droplet name=“atg/dynamo/droplet/foreach”>
<dsp:droplet name=“atg/dynamo/droplet/switch”>
<dsp:droplet name=“atg/dynamo/droplet/empty”>
<dsp:droplet name=“atg/commerce/catalog/ProductLookup”>

FORM HANDLERS
Evaluates the form data before it is submitted, check for errors, and
determine what action to take.
The form input fields are associated with the properties of the form
handler rather than the component that we want to modify
E.g. <dsp:input type=“text” bean=“MyFormHandler.age”>
Form Handler must include one or more handler methods, to handle
the processing of the form.

CONTD…
Handler methods links form elements with Nucleus components
Signature of the handler method
Public boolean handleXXX(DynamoHttpServletRequest req,
DynamoHttpServletResponse res){
----
}
Action based on return valueReturn Value Action
false No further values are processed after the handler is
called. Rest of the page is not served.
true Normal processing of the form values continues
Page specified by the form’s action attribute is served.

CONTD...
Sample Jsp file showing form data
<dsp:form action=“SaveData”>
<dsp:input type=“text” value=“jeet”
bean=“MyFormHandler.firstName” />
<dsp:input type=“text” value=“singh”
bean=“MyFormHandler.firstName” />
<dsp:input type=“submit” value=“Save”
bean=“MyFormHandler.save”/>
<dsp:input type=“cancel” value=“Reset”
bean=“MyFormHandler.cancel” />
</dsp:form>

CONTD…
public class MyFormHandler extends GenericFormHandler{
private String firstName;
private String lastName;
public boolean handleSave(DynamoHttpServletRequest req,
DynamoHttpServletResponse res){ return true/false;}
public boolean handleCancel(DynamoHttpServletRequest req,
DynamoHttpServletResponse res){ return true/false;}
…..
…..
}

CONTD…
MyFormHandler.properties
$class=MyFormHandler -> Fully Qualified Class Name
$scope=request -> how the class instance will behave
age=25 -> form handler property. We have to provide as
name value pairs.
subjects= java,atg,openapi
prop1^=MyOtherFormHandler.prop1

SCOPE OF THE COMPONENTS
•Scope specifies how the nucleus component is used among
different users.
•We specify the scope of the component in .properties file
•Available scopes
• Global: shared among all the users (default)
• Session: for each user session a separate instance will be provided
• Request: for each active request a separate instance will be provided
• Window: for each browse window a separate instance will be provided
• Prototype: every time the component is resolved separate instance of the
components will be provided

Overview of atg framework

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