Sun Webserv J2EE

8/9/2019 Sun Webserv J2EE

1/47

Ho w t o Bu i l d an E-Com m erce App l i ca t i on

u s i n g J2EE

Caro l M cD ona ld

Co de Cam p En g ine er


2/47

Code Camp A g e n d a

J2EE & Blu ep r in t s Application Architecture and J2EE Blueprints E-Commerce Application Design

En t er p r ise Java Bean s(EJB)

Designing and implementing the Business Model: Ent i t y Beans, Sta te less and St a t e f u l Se ssi o n Beans Serv le t s , Java Server Pag es (JSP)

Designing and architecting the "View" or Presentationlogic

Assem b l i ng and Dep loy ing the J2EEApplication: Transact ions JTSand JTA Describe how the sample application uses the transaction

capabilities of the J2EEplatform to simplify componentdevelopment.

Secur i ty How to use J2EEsecurity to safeguard your e-commerce

application


3/47

Do w n l o a d Co d e Ca m p s

A l l sl i des w i t h no tes a re on y ou r CD

Yo u can d o w n l o a d th i s an d o th er Cod e Cam ps :

EJB, Java Performance, J2ME, JINI, JMS, JSP, XML

http:/ / www.sun.com/ developer/ evangcentral under Events: Developer Code Camps

ALSO

You can also ask questions there

Listen to audiocasts


4/47

J2EE& BlueprintsA g e n d a

Application Architecture and J2EE Sun BluePrintsDesign Guidelines Architecture of the sample application


5/47

Arch i tect u r e and th e Cub e

Architectingyour application UsingTiersTiers and

LayersLayersaffect the applicationCapabilitiesCapabilities


6/47

CapabilitiesCapabilities= Non-Functional SystemRequirements

Ava i lab i l i t yAva i lab i l i t y : service is access ib le Rel iab i l i t yRe l iab i l i t y: cons is tency of application and

transactions

Capaci tyCapaci ty : can serve # u sers Extens ib i l i t yEx tens ib i l i t y: can a d d f u n ct i o n a l i t y

Flex ib i l i t yF lex ib i l i t y: can su p p o r t ch a n g e s

Per fo rm anc ePer fo rm anc e : good r espo nse t im e

Scalab i l i t ySca lab i l i t y : ca n support i nc reased lo ad


7/47

Exam p le Arch i tectu re Requ i rem en t s

E-Co m m er ce Ap p s: Many Clients,

l o t s o f r ead ing ,

l e ss upda t i ng ,

low contention N e e d H i g h pe r fo r m ance and sca lab i l i t ype r fo r m ance and sca lab i l i t y fo r Read ing

d a t a

I nsu r anc e In t r ane t App :

Fewer Clients, Low con cu r r en cy High transaction isolation level, N e e d H i g h e r

Consis tency

Rel iab i l i t yRe l iab i l i t y o f Upd a tes to DBm o r e im p o r t an tm o r e im p o r t a n t thanperformance for Reading data


8/47

The Re la t i on sh ips be tw een t he Elem en t s o fA rc h i t ec tu re

Arch i tec t ing your application Using Tiers and Layers af fect the

application Capabi l i t ies


9/47

J2EEPla t fo rm Spec if i ca t i on

JNDI

J2SE

JMS

RMI/IIOP

JDBC

DatabaseDatabase

AppClientApp

Client

App Client

Container

App Client

Container

HTTP/HTTPSHTTP/HTTPS

J2SE

RMIRMI

J2SE

JNDI

JMS

R

MI/IIOP

JDBC

JTAJavaMail

JAF J

NDI

JMS

R

MI/IIOP

JDBC

JTAJavaMail

JAF

HTTP/HTTPSHTTP/HTTPS

AppletContainer

AppletContainer

AppletApplet JSPJSP ServletServlet EJBEJB

Web ContainerWeb Container EJB ContainerEJB Container

RMIRMI

J2SEJ2SE

C omponen ts r u n w it h i n Conta iner.

Conta iner prov ides Run t im e env ir onm en t , J2SE & J2EEAPIs, a n d remo te

c o m m u n i c a t i o n


10/47

Laye rs o f Ser vices: TheApplication Server provides servicestothe Container, which in turn providesservices to the EJB.

PersistenceTransactionsNaming

O

RB

DB

Client

Environment Services

EJBEJB EJB

Container

Application Server

Operating System Services

Application Server ServicesApplication Server Services

Container ServicesContainer Services

ApplicationApplication


11/47

Layers

Layers are abs t rac t ions o f u n d e r l yi n gi m p l e m e n t a t i o n

Each Lay er h i d e s i m p l e m e n t a t i o n d e t a i l s o f l ay e r

b e l o w The Conta ine r p ro v ides com po nen ts serv ices o ft h e l ay e rs be low

A d v a n t a g e s:

Easie r deve lopm en t , m a in ten ance fo r h i ghpe r fo r m ance , sca lab i l i t y

Does n o t r equ i r e deve lope r to k n o w complexdetailsofd i st r i bu ted p r o t oco l s, concurrency,transactions, l oad ba lan c ing , secur i t y , resou rcep o o l i n g a n d s h a r in g


12/47

App l i ca t ion Server : Key Services

Dispatch ing

Developer

Session M anagem en t ,

Caching

ThreadA l l oca t i on

App l ica t io n s Servers areprimarily

Resource ManagersResource Managers

Object Poo l i ng

App l i ca t io ns Servers M a n a g e : d i spa t ch ing , th read a l l oca t i on ,

po o ls , caches , l oad ba la nc ing , clu ste r s


13/47

W h a t f e at u r e s m ig h t yo u l o o k f o r in a nApp l i ca t ion Server?

Clustering

LoadBalancing

TransactionManagement

Security


14/47

EJB Co n t ai n er Ser vices

EJBEJB EJB

Container

Application Server

Tran sact io n Secu r i t y

Sta teM a n a g e m e n t

Pers istenceLife Cycl e

R emo te

In te r face

Transactionmanager


15/47

C o m p o n e n t s

M o n o l i t h i c:1 b i n a ry f i l e

Re co m p i l ed &

l i n k e d f o r a n y

c h a n g e s

C o m p o n e n ts: p l u g -g a b l e Pa r t s. Im p l e m e n t a t io n s ep a r a t ed f r o m

In te r face , only Interface published h i d e s i m p l e m e n ta t i o n d e ta i l s B e t te r des ign , eas ier u p d a t e s

Bet t e r Flex ib i l i t y , Ex t ens ib i l i t yBet t er Flex ib i l i t y , Ext en sib i l i t y


16/47

Arch i tect u r e and th e Cub e


17/47

HTML Web Server

RMI / IIOP

Application Server

Data Base

n -t i e r A r ch i t e ctu r e w i t h J2EE

RDBMS

PeopleSoftSAP R/3

Legacy

Systems

networknetwork

Browserclients

C++, VB..

clients

Java

clients

HTTP

BeansContainer

Clients EIS Tier


18/47

Tiers

Tie rs separ a t e fun ct io n a l i t y

Presentation Logic, Business Logic, Data Schema

Adv an tages :

One tier can be changed w i t h o u t ch a n g i n g t h er es t= easie r up da tes

Lo w e r d e p l o ym e n t and m a i n t e n a n c e costs.

Capabilities go up: Flexibility , ExtensibilityCapabilities go up: Flexibility , Extensibility


19/47

CapabilitiesCapabilitiesNon-Functional Requirements

W ebServer

W ebServer

W ebServer

Ap pServer

Ap pServer

Ap pServer

ROUTER

Reliability, Availability, Extensibility,Reliability, Availability, Extensibility,

Flexibility, Scalability, Goes upFlexibility, Scalability, Goes up

ROUTER

W i t h Goo d Arch i tec tu re , Layer ingLayer ing , TiersTiers,Load Ba lan c ing , Clus ter in g, Tran sact ion M gm t, Secur i ty


20/47

W h y J2EE?

Gives you the Adv an tages of a Standard izedLayeredLayered , TierTier Architecture:

Simp l i f i es the complexity of a bu i ld in g n -t i e rapp l i c a t i ons.

Standard izes an API between c o m p o n e n t s andapplication server c o n t a i n e r .

J2EEApp l i ca t io n Server and Con ta in e rs p ro v ide t he

f r am ew ork Se rvi ces


21/47

A g e n d a J2EE& Blueprints

J2EE Architecture Sun BluePrintsDesign Guidelines Architecture of the sample application


22/47

The J2EEPlatformHas a Rich Set o f APIs

Middle

Tier

EIS

Tier

Client

Client

Client

Client

Other Services:JNDI, JMS,

JavaMail

EnterpriseJavaBean

EnterpriseJavaBean

Enterprise

Information

Systems (EIS):

Relational-Database,

LegacyApplications,

ERP Systems

Client

Web Server

JSP, Servlet,

HTML, XML

Application

Server

Client

Tier

Firewall


23/47

Why J2EEBlueprints

Rich APIs M o re t h an o n e w ay ofdoing things

SimilarProblems

Need to l eve r age t i m e -t est edso l u t i ons

Dont reinvent the wheel

BluePrints

Provides Answer s,Examples of Best Pract ices


24/47

J2EEBlueprints

Guide l ines and Best p rac t ices f o r designing n-tierenterprise applications with J2EE

J2EEbluepr in ts inc lude:

Book, Designing Enterprise Applications

Application (sou rce cod e)

Java Pet Store

FREE:

h t t p :/ / ja va .su n .co m / j2 ee


25/47

B l u e p r i n t s

FREE: h t t p :/ / ja va .su n .co m / j2 ee


26/47

J2EEJ2EEDel i ve rab lesDe l i ve rab les

J2EEJ2EE

J2EEJ2EE

Speci f i ca t ionSpeci f i ca t ion

J2EEJ2EEReferenceReference

I m p l e m e n t a t i o nI m p l e m e n t a t i o n

J2EEJ2EEB luePr in t sB luePr in t s

J2EEJ2EECompat i b i l i t yCompa t i b i l i t y

Test Su i t eTest Su i t e


27/47

JavaPet StoreDemo


28/47

Some Key BluePrintsQuestions-Issues Faced by Developers

W h e n t o u se Serv lets verses JavaServerPages?

W here t o sto re cl ien t session st at e:client-tier, web-tier or EJBtier?

Access Dat a Base Resou rces via EJBordirectly from JSPJavaBean ?

W h e n t o u se EJBcomponents? W h e n t o u se Sessio n Bean s and when to

use En t i ty Bean s?


29/47

Design of Sample ApplicationBlue p r in t s Ch o ices:

Blueprints Choices:Client tier

H T M L Cl ients for End-User Web Access

XM L for Data ex te rn a l i za t i on (Orde r p rocu rem en t )

Web Server tier JavaServer Pages(JSP)

for d y n a m i c co n t e n t g e n e ra t i o n

Application Server tier EJBfor bu siness log ic


30/47

J2EEBlueprints Guidelines

1 . Scen ar io s o r U se Cases

2. partitioning of functionality into modules3. Application architecture using Model-View-

Controller:

1. assignment of functionality to tiers:

1. Design of the Model2. Design of the View

3. Design of the Controller

2. object decomposit ion within tiers

Process for developing an application fromr e q u i r e m e n t s, t o d e si g n , t o i m p l e m e n t a t i o n


31/47

1) Sample Application Shopping Scenario

1. Web-based b r o w s i n g of a product ca ta log2. Creation and maintenance of a sho pp ing car t

3. User account creation/ Login

4. Placin g o rd er s5. Secure order processing

1. B2B transactions

2 . Ex t er n al isa t io n o f o r d er d at a (expressed in XML)

3 . Or d er co n f i r m a t io n using e-mail


32/47

1 ) U se Case Sh o p p in g Scen ar io

C r e a t e / U p d a t e C u s t o m e r A c co u nt

C u s t o m e r

A d d O r d e r t o W a r e h o u s e S y s t e m

( e x t e r n a l )

L o g i n t o C u s t o m e r A c c o u n t

S e n d R e c e i p t

c h e c k o u t o r d e r i t e m s

< < i n c l u d e s > >

< < e x t e n d > >

< < i n c l u d e s > >

B r o w s e C a t a l o g

a d d i t e m s t o s h o p p i n g c a r t


33/47

Sh op pin g Scen ar io Sequ en ce Diagram

: C u s t o m e r

Ca ta log Shopp ing

Cart

Or de r Inventory Ma i l e r Cont rol ler Accoun t

add i tem to ca r tadd i tem to ca r t

b rowse p roduc ts

c h e c k o u t ge t i tems i n ca r t

ge t accoun t de ta i l s

c rea te o rde r

update inventory

send ema i l rece ip t


34/47

J2EEBlueprints

1. Scenarios or Use Cases

2 . p a r t i t i o n i n g o f f u n ct i o n a l i t y i n t o m o d u l e s

3. Application architecture using Model-View-Controller:

1. assignment of functionality to tiers:1. Design of the Model

2. Design of the View

3. Design of the Controller

2. object decomposit ion within tiers


2 ) Di i d h A l i i I M d l


35/47

2 ) Di vi d e t h e Ap p l i ca t i o n I n t o M o d u l e sBased o n Serv ices (Fu n ct ion a l i t y )

A c c o u n t User Account Module: tracks user account

information

C a t a l o g Product Catalog Module: provides searchfor products, and product details

C a r t Shopping Cart Module: allows user to save

selected items for the session.

O r d e r Order Processing Module: performs order

Processing when user buys the items in the

cart.

2 ) Di i d t h A l i t i I t M d l


36/47

2 ) Di vi d e t h e Ap p l i ca t i o n I n t o M o d u l e sBased o n Services

I n v e n t o r y Inventory Module: maintains informationon the number of each type of product in

stock.

M a i l

Messaging Module: sends confirmationreceipt messages.

C o n t r o l

Control Module: control interactionsbetween user (browse, add items,

check out) and business objects.


37/47

In t e r r el a t i o n sh i p o f t h e m o d u l e s

C o n t r o l

C ata l og

A c c o u n t

Inventory

O r d e r M a i l

Cart

browse

new/existing account

checkout

add/removeitems

Userinterface


38/47

J2EEBluepr ints

1. Scenarios or Use Cases

2. partit ioning of functionality into modules

3 . App l i ca t i on a r ch i t ectu re usi ng M od e l -V iew -Con t ro l l e r :

1 . a ssi g n m e n t o f f u n ct i o n a l i t y t o t i e r s:1. Design of the M o d e l

2. Design of the View

3. Design of the Con t ro l l e r

2. object decomposition within tiers


Di id A l i t i Ob j t i t 3


39/47

Divide App l i ca t i on Ob jects in to 3ca tegor ies :

Model View Controller (MVC) UI Pattern M o d e l represents the application bu siness da t a and ru l es

View is a scr ee n r e p r ese n t a t i o n o f m o d e l , presen t s th euse r i n t e r face

Con t ro l l e r m e d i a t e s their i n t e ra c t i o n s


40/47

M od e l View Con t ro l l e r Design Pa t t e rn

View Controller

Model

User event

Business Event

View selection

Get

Data

To Display

JSP

JavaBeans

components

Session EJB

And

Servlet classes

Entity EJB and Session EJB


41/47

Assign m en t o f Fu n ct i on a l i t y t o Tie r sAssign m en t o f Fu n ct i on a l i t y t o Tie r s

View Co n t ro l le r M o d el

PresentationLogic

ApplicationRequests

BusinessServices

PersistenceDomainObjects

Presen t a t io n Bu sin ess Lo g ic Data


42/47

MVC With J2EETechnology

Build ViewView in the W eb -tier Use JSPcomponents for p r e se n t a t i o n l a yo u tp r e se n t a t i o n l a yo u t Custom tags and JavaBeanscomponents for

p r e se n t a t i o n l o g i cp r e se n t a t i o n l o g i c

Build Cont ro l l e rCon t ro l l e r in the W e b/ EJBtier Serv le t for d ispa tch ingd ispa tch ing Session bean for co n t r o l w i t h i n b u si n e ssco n t r o l w i t h i n b u si n e ss

ob jec tsob jec ts

Build M o d e lM o d e l in the EJBtier Session beans for Bu sin ess Ser v icesBu sin ess Ser v ices: Process

and Rules Ent i t y beans to maintain m o d e l d a t am o d e l d a t a

Assign m en t o f Fu n ct i on a l i t y to Tiers o r#A


43/47

Assign m en t o f Fu n ct i on a l i t y t o Tiers o rVer t i ca l Layer in g

PresentationControl

PresentationLayout

BusinessServices

DomainObjects

Data AccessObjects

Session Ent i ty DAOServ le t

JSP


44/47

W h a t a r e Do m a in Ob j e ct s?

Domain Objectsm o d e l t h e re al w o r l den t i t i esen t i t i es, nounsnouns in business problem

Also known asData M od e l , bu siness ob ject

m o d e l Example

User Account,Account,

Order,Order, Product,Product,

InventoryInventory


45/47

W h at ar e Bus ine ss Serv ices?

Bu sin ess Ser vices M o d el t h e verbsverbs inapplication

Bu sin ess p ro cesses are the servicesservices in t h e

u se cases Example

Br owseBr owse Catalog

Ad dAd d i tem to Cart PurchasePurchase items

Sample Application Architecture Vert ica l Layer ing


46/47

servlet

Catalog

Cont ro l l e rShopping

Inventory

Order

Account

JSP

Mailer

JSP

EntityEntity EJBsEJBsSessionSessionEJBsEJBs

Produc tsI t e m s

JavaBean

Orde rs

Accounts

Cont ro l le rCon t ro l le r

Java

Bean

DomainObjects

BusinessServices

PresentationLayout

Sample Application Architecture Vert ica l Layer ing

Presentation

Control

ViewView


47/47

S u m m a r y

W e w e n t o ve r :

Advantages of ho r i zon ta l l ay e r sho r i zon ta l l ay e r s

Advantages of Ver t i ca l Tie rsVer t i ca l Tie rs

Af fect o fA f fect o f LayersLayers an d TiersTiers o no n Capabi l i t iesCapabi l i t ies .. the pr ocess o f a rch i tec t i n gpr ocess o f a rch i tec t i n g the sample

application

the M o d e l Vi ew Co n t r o l l erM o d e l Vi ew Co n t r o l l e r Design Pattern

Documents

Sun Webserv J2EE