Complete EJB PPT

8/9/2019 Complete EJB PPT

1/93


2/93


3/93

2. About the Author2. About the AuthorKantimahanti.N.%.Prasad

Worked in fortune 100 Corporates in Client Server Technologies.

Specialies in

Architecture! "esigning! "evelop#ent $ %anaging da&'to'da& activities.

(resentl& doing a (h" at )ueens *t&! *.+ in Adaptable Soft,are specific to

Co#ponent Technologies and has a %.-.ACo#puter Applications/ fro# an *.S. *t&.

-usiness do#ain strengths are in nvest#ent banking $ nsurance.

(rocess i#prove#ent strengths are in ' Sig#a and C%%.

is present $ past ,orking e3periences in various global locations are in corporates like

(ra#erica (rudential *.S/! 4 ( %organ Chase! A - 5 A#ro -ank $ S6S.

e ,as a part ti#e visiting facult& in affiliates of S&dne& *niversit&! Australia and All ndia %anage#ent

nstitute teaching .T! (roject %anage#ent $ Statistics. e has given so#e presentations on (roject

%anage#ent and T)% at various venues. e has ,on fe, Talent7STA8 perfor#ance a,ards and pla&s

al#ost all the sports ,hat are under the Sun.

e hails fro# 9iag7 &derabad : ndia. is ;rdpart& tested Te#pera#ent Sorter results are belo,httpsT"?@02B1@;$("?1DB00

httpsT"?@02B121D$("?1;0

f &ou liked his presentation! tell others and if &ou have a co##ent! tell hi#. e can be reached at

+anti.(rasadE(ra#erica.ie or +anti1Edonegal.net

U NEE!

"AI#

TI## U $UIT


4/93

;. Thank &ou note;. Thank &ou note

)e 8ishes to than> Pa2l Perrone 7 Pa2lo Merson 9 'amesh +ehra or ma>ing

this t2torial loo> the 8ay it does.

)e 8ishes to than> *oerg M2eller7 M2r2ganandam7 Charles*ohnson 9 ?en2

adi2m 8ho had ol2nteered to do the editing o this presentation.

his %isters

Than% &ou for do'nloadin( m& Presentation

Than% &ou for do'nloadin( m& Presentation

%pecial than>s to all his Managers at Pramerica and Pr2dential #.%.

9 his Co2sinshis +rothersr.'ao 9

(amily

his Parents%A)I%#NA"ANA

A'#NA

&ICAT& T!Copyright 2004 Kanti Prasad All rights reserved

)e 8ishes to than> to Katherine +allantyne7 Choi K8an 8ho ol2nteers to

edit all o his Articles 9 Presentations.


5/93


6/93

D.D. Co#ponent CharacteristicsCo#ponent Characteristics

Properties 'e2saility

!perations %hareale

&ents istri2tale

eployale %el Containment

%el description

Components Characteristics incl2de

Copyright 2004 Kanti Prasad All rights reserved


7/93

Components sho2ld hae a mechanism or e=porting

.. Co#ponent ( G HCo#ponent ( G H

Properties

!perations

&ents



8/93

@. "eplo&able Co#ponents@. "eplo&able Co#ponents

Components are operation independent o

F )ard8are

F The 2nderlying operating system

F Their Application %erer

F The net8or> protocol they 2se



9/93

B. 8eusable Co#ponentsB. 8eusable Co#ponents

Component serices can e 2sed as a part o

2siness logic o other components



10/93

. Shareable Co#ponents. Shareable Co#ponents

I m2ltiple clients are 2sing a component

sim2ltaneo2sly7 the component 8ill proide

the same 2ality o serice to all the clients



11/93

10. "istributable Co#ponents10. "istributable Co#ponents

Components sho2ld proide serices to clients

r2nning locally or remotely

'emote

CI&NT%

&*+ Container

&*+

Possile

'emoteCI&NT%

'emote

CI&NT%

'emote

CI&NT%

ocal

CI&NT%



12/93

11. SelfContained Co#ponents11. SelfContained Co#ponents

Components sho2ld only contain the code

necessary to implement their serices

Inrastr2ct2re serices sho2ld e inFected y

the e=ec2tion enironment



13/93

12. Standard nfrastructure 5eeds12. Standard nfrastructure 5eeds

%tandard inrastr2ct2re serices incl2de

F irectory %ericesF istri2ted transaction management

F %ec2rity management

F Conc2rrent access management

F Persistence management

F 'eso2rce pooling Ge.g. + connectionsHF Administration interace

F oad +alancing

F (a2lt tolerance



14/93

1;. Applicatoin Servers1;. Applicatoin Servers

An application serer proides the inrastr2ct2re and

serices to r2n componentsapplications

*&&

asedsol2tions

NonJ*&&

sol2tions

GP)P7 Cold (2sion7Perl7 etc.H

Microsot %ol2tions

GC!M7 A%P.Net?+.Net7C etc.H

Application %erer prod2cts are mostly



15/93

1. Gbject (ooling1. Gbject (ooling

An application serer may create a pool o are oFects

that may e 2sed as &*+s 8hen re2ests are made

App %erer

&*+ Container

CI&NT

Net8or>+

CI&NT&*+

&*+

&*+

&*+

&*+

&*+

Pool



16/93

1D. "irector& of Application Servers1D. "irector& of Application Servers

Application %erers proide clients access to sot8are orother applications that r2n only on the serer

&=amples incl2de 8e serers7 eJmail serers and dataase serers

Pop2lar Application %erers areL

F I.+.M. $e %phere

F +&A $e ogic

F %2n *aa %ystem Application %erer :.=

F *oss

The 2ll list 8ith ital statistics are aailale at

httpL888.de=.comenterprisehtml166;

httpL888.Faacommerce.comarticlessererlist.htm

http://www.devx.com/enterprise/html/16268http://www.javacommerce.com/articles/serverlist.htmhttp://www.javacommerce.com/articles/serverlist.htmhttp://www.devx.com/enterprise/html/16268


17/93

Container proides %ystem serices li>e

App %erer

CI&NT

Net8or>%T#+

Persistence %ec2rity Connection Pooling ThreadingTransaction

&*+ Container

&*+

(ish cannot s2rie o2tside 8ater 9

&*+s cannot s2rie o2tside containers

Container

intercepts

re2ests


Container >no8s 8hat to do7 as yo2 descrie eerything in a special descriptor ile

A Container LF proides the enironment in 8hich a ean e=ec2tes

F generates )ome !Fect

F generates &*+ !Fect

F manages indiid2al ean instances

&*+

&*+

9

)ontainer means a

pre developed *oft'are

To increase capa+ilit&,

clusterin( is ta%en care

+& the vendor

#plicit %iddle,are

gained through declaration

1. Container1. Container


18/93

[email protected]@. 42HH Gvervie,42HH Gvervie,

ard,are (latfor#

Gperating S&ste# (latfor#

*&&

Container%erer

!perating %ystem

Independence

)ard8are Independence

Common Programming

%erices

istri2ted Comm2nication

%erices

42SH 8unti#e

42SH Language7nterfaces

services standards co#ponent'based

Hnterprise Co#ponents

Application %erer

Independence

ataase Independence

$e %erer Independence

&nterprise 'eso2rce

Management %erices

"eploent7Configuration

%anage#ent Services

42HH nterfaces

"ata

eploymentescriptors GsH

eployment

escriptors GsH

"eplo&

Tools



19/93

*%&

Application Client

Container

+%AA*

*AEJ

'PCC

!

N*ME

*

M

%

$

&

+

%

*

A

E

'

*

+

C

MgmtA!

Client

*%&

%AA*

*AEJ

'PC *T

A

C!

N*ME

Mgmt

*A(

*aa

Mail*

M

%

*

AC

C

$

&+

%

*

AE

'

*

N

I

*

+

C

Applet

Container

*%&

)TTP%

)TTP%

$e Container

*%P %erletApplet

TI&'

3 TI&'

%AA*

*AEJ

'PC *T

A

C!

N*ME

Mgmt

*A(

*aa

Mail*

M

%

*

AC

C

$

&+

%

*

AE

'

*

N

I

*

+

C

&*+ Container

*%&

'MI

II!P

'MI

II!P

4 TI&'

&I%

Main(rames

&*+

*&& deines a model or deeloping m2ltiJtier7 8e ased7

enterprise applications 8ith distri2ted components

1B.1B. 42HH 1. A(s42HH 1. A(s

(or all the APIs reer httpLFaa.s2n.comFee1.4docst2torialdocinde=.html

*%P %erlet &NIN&



20/93


21/93


22/93

21.21. When to use H4-When to use H4-

I any o these re2irements hold or yo2r application

F the application m2st e scalale and distri2taleF Transactions 8ill e re2ired to ens2re data integrity

F the application 8ill hae a ariety o clients



23/93

22.22. *aa Naming and*aa Naming and

irectory Interace G*NIHirectory Interace G*NIH*NI

Proides a standardiDed 8ay o accessing reso2rces in a distri2ted

enironment

Protocol and naming serice agnosticF N%

F NI%

F AP

F E.500

Implemented y the Faa=.naming pac>age and three other pac>ageselo8 it

Faa=.naming.InitialConte=t is the entry point to the &*+ %erer

F ind associates a name 8ith an oFect

F loo>2p inds an oFect gien the name



24/93

2;. H4- Specification2;. H4- Specification

The &*+ speciication deines interaces et8een

F the &*+ and its containerF the container and the application serer

F the container and the client



25/93

2. H4- 8oles2. H4- 8oles

%erice 9 Tool Proider

proides %erer7 Container and integrates 8ith distri2ted acilities

Tools Proider

&*+ Proider

Application Assemler

Application %erer Proider

eployer %ystem Administrator

maintains deployment

s2pplies tools 2ilds application

deelops &*+ss2pplies Application %erer

deploys system

&*+ Proider

creates &*+ components

eployment %pecialistdeploys apps and 2nderstands architect2re iss2es

Application Assemler

assemles apps rom perJ2ilt &*+ comp



26/93

2D. H4- "esign Approaches2D. H4- "esign Approaches

&*+ model is ased on three asic design approaches or2ilding distri2ted component systems

%tateless serer approach %essionJoriented approach

Persistent !Fect approach


Faa=.eF.&nterprise+ean interace

Faa=.eF.&ntity+ean

The &*+ speciication proides these as%tateless session +eans Message drien eans

%tate2l session +eans &ntity +eans

All &ntity+eans All %ession+eans All Messagerien+eans

e=tends e=tends e=tends

implements implements implementsInterace Interace Interace

e=tends

Faa=.eF.%ession+ean Faa=.eF.Messagerien+ean

Implementing one o these interaces

indicates yo2r *A?A class is an &*+.

It is only a mar>er Interace

and there are no methods to

Implement.

As all these are e=tending the

t8o Interaces hence they hae

the ehaior o oth the Interaces.%erialiDation is the reason

&*+ is distri2tale.

Faa.io.%erialiDale


27/93

2.2.H4- ArchitectureH4- Architecture

'MIII!P

%erer A

App %erer

&*+ Container

creates

Naming %erice s2ch

as AP

%erer +

*NI

Initial Conte=t

)

)

1

%&'?IC&%

Naming Transaction Persistence %ec2rity

+

&I%

Main(rames

3

4 5

6

:

;

eletons7 net8or> and so it is aster.

&*+ !Fect or&*+ ocal !Fect

*M% estination

%&%%I!N +&AN% are li>e ?&'+% as they represent action or 2siness process related logic.


30/93

2.2. H4- ClientH4- Client

&*+ clients

2tiliDes the *aa Naming and irectory Interace G*NIH to loo> 2p

or the reerences to home interaces

2se home and remote &*+ interaces to 2tiliDe all &*+Jased

2nctionality



31/93

;0.;0. H4- o#e nterfaceH4- o#e nterface

&*+ home interaces e=tends Faa=.eF.&*+)ome

&*+ home interaces proide operations or clients toF create &*+sF remoe &*+sF ind handles to &*+ remote interace oFectsF hae its st2 placed into *NI at start2p



32/93


33/93

;2.;2. H4- #ple#entationH4- #ple#entation

&*+ implementation

Class in 8hich &*+ deeloper codes the 2siness methodsdeined in the eans component interaceGsH to proide any

application speciic

F 2siness method inocation

F creationF remoalF indingF actiationF passiation7 dataase storageF dataase loading logic



34/93

;;. Session Conte3t;;. Session Conte3t

The Container has already reerence to the ean

The ean interacts 8ith the Container thro2gh %essionConte=t and

F retriees home interaces

F gets and sets transactions attri2tes

F otains sec2rity attri2te

The set%essionConte=t method is 2sed to inorm the ean

ao2t the session conte=t



35/93

;. Stateless Session H4-;. Stateless Session H4-

%tateless session &*+s hae the ollo8ing ehaio2r

F proide a single 2se serice

Fdo not maintain state on ehal o the client

F are relatiely short lied

F do not s2rie &*+ serer crashes

F any t8o instances o the same stateless session &*+

type are al8ays identical

Feach instance can e shared y m2ltiple clients



36/93

42HH H4- Container7Server

;D.;D. Stateless Session H4-sStateless Session H4-s9ie,9ie,

&*+ Impl eeloper ?ie8

&*+ gets re2ests and generates responses

An instance can serice m2ltiple clients oer time

&*+ Client eeloper ?ie8

creates it7 2ses it and then its done

&*+ Container ?ie8

can p2ll instances rom pool 2pon client re2est

can shrin>gro8 pool as needed

A e8 pooled eans can serice tho2sands o clients

Client (rocess

H4-

Client 'emote

)ome

Stateless Session

ocal)ome ocalH4- Client

5et,ork

Logic

input

outputH4- (ool


37/93

(ool of eJuivalent

#ethod read& instances

ejb8e#ove/

eFCreateGH

-ean nstance

does not e3iistContainer decided it

needs #ore instances

in the pool to service clients

Client called re#ove/

on the H4- object

or the client ti#es out/

Class.ne,nstance/

set%essionConte=tGH

&ach method call is an

inocation rom the

container to the +ean

36. ie Cycle36. ie Cycle oo %tateless %ession%tateless %ession+ean+ean

Transactional

+2siness Method

Client called another

Transactional business #ethod

on the H4- Gbject.


38/93


39/93


40/93


41/93


42/93


43/93


44/93

;. Shared Hntit& -ean;. Shared Hntit& -ean

$hen m2ltiple clients share an &ntity &*+ they

F receie their o8n instance

F share the 2nderlying data

F do not hae to handle synchroniDation

App *erver

EJB )ontainer

)#IENT

Net'or%

-B

)#IENTEJB

EJB



45/93

8ead&ejbLoad/ ejbStore/

(ooled

(assivates the -ean

ejbCreate/

ejb(ostCreate/

ejb8e#ove/

ejbo#e/ eF(indGH

"oes not e3iistContainer decided it

needs another

Hntit& -ean insinstance

Container decided it

doesnKt need the

Hntit& -ean instance

anore

Client called a finder

%ethod on the ho#e

interface

Client called re#ove/

on the H4- object

this ,ill destro&

"atabase data/

Container deter#ined

that the database is out of

s&nch ,ith the bean. The

-ean needs to store its

"ata into the "atabase

Container deter#inedthat the database is out of

s&nch ,ith the bean. The

-ean needs to load the

ne, "atabase data.

Client called create/ on

the ho#e interface this ,ill

Create ne, database data/

Client called instance

independent ejbo#e/

-usiness #ethod

Activates the -ean

ne,nstance/

setHntit&Conte3t/

unsetHntit&Conte3t/

49% ,ill garbage

collectt and call finalie/

ejbActivate/

ejbLoad/

ejbStore/

ejb(assivate/

&ach method call is an

Inocation rom the

container to the +ean

44. ie Cycle44. ie Cycle oo +MP+MP &ntity +ean&ntity +ean

+2siness Method

Client called a business

#ethod on a H4-Gbject


46/93


47/93


48/93


49/93

B. %essage "riven -eanB. %essage "riven -ean

M+ has the ollo8ing ehaio2r

F Is stateless

F is a *M% listener

F 8hen a *M% message arries the method

onMessageGH is e=ec2ted

F does not s2rie &*+ serer crashes

F proides a singleJ2se serice

F is relatiely short liedF is only a ean class no interaces



50/93


51/93


52/93


53/93

D2.D2. Gther interfaces and classesGther interfaces and classes

ocal interaces are 2sed or access 8ithin serer conte=t Faa=.eF.&*+ocal)ome

Faa=.eF.&*+ocal!Fect

Interaces or serialiDing &*+ reerences )ome)andle J reerence to &*+)ome

)andle J reerence to &*+!Fect

&*+Metaata interace proides mechanism to gatherinormation ao2t the ean reerence to &*+)ome oFect

)ome7 component interace and primary >ey classes

2nctions to determine ean type

&.g.LFInter component callsF%erlet inocation



54/93


55/93


56/93


57/93


58/93

D@ ello-ean o#e nterfaceD@ ello-ean o#e nterface


59/93

D@. ello-ean o#e nterfaceD@. ello-ean o#e nterface

pac>age e=amples O

import Faa.io.%erialiDaleOimport Faa.rmi.'emote&=ceptionO

import Faa=.eF.Create&=ceptionO

import Faa=.eF.&*+)omeO

p2lic interace )ello)ome e=tends Faa=.eF.&*+)ome

)ello createGH thro8s Faa.rmi.'emote&=ception7

Faa=.eF.Create&=ceptionO

Q


8ules of 4ava sa&s package declaration should be at the beginning and ends ,ith a se#i colon

This is the o#e nterface for the o#e H4- ello-ean/.

This #ethod creates7#anufactures the H4-Gbject and returns it . This create/ #ethod corresponds to the

ejbCreate/ #ethod in ello-ean.

5ote n o#e nterface ,e are thro,ing 2 e3ceptions 8e#ote and Create .

NO!E " #ules o$ %nter$aces states that there should e no i&ple&entation so you will $ind only &ethod signatures'

Gur interface elloo#e is e3tending H4-o#e #eans it has all the behaviour of H4-o#e

%nter$ace &ethods should end with a se&icolon (

H4- H3a#ple reJuire#ent age e=amples O

import Faa.2til.RO

import Faa=.eF.&*+!FectO

import Faa.rmi.'emote&=ceptionO

p2lic interace )ello e=tends Faa=.eF.&*+!Fect

p2lic %tring helloGH thro8s Faa.rmi.'emote&=ceptionO

Q



Clients interact ,ith the H4- Gbject through this 8e#ote interface that is ,h& ,e need to ,rite this interface '

As for ever& nterface ,e need i#ple#entation! so Container ,ill i#ple#ent autogenerate code/ for this 8e#ote nterface for us! ,hich is the H4-Gbject

As our reJuire#ent ,ants a business logic to greet ello World a single #ethod ,ould be sufficient .

As 8e#ote interface is used to interact ,ith the -ean ,e need to #irror all the #ethod signatures ,hat

are there in a -ean class so that is ,h& ,e are ,riting onl& one #ethod in this 8e#ote interface.

5ote H4- specification states that all re#ote calls should thro, 8e#oteH3ception so ,e are thro,ing it.

So lets code the 8e#ote nterface


Gur interface ello is e3tending H4-Gbject #eans it has all the behaviour of H4-Gbject


#porting the reJuired files

0 elloLocal nterface0 elloLocal nterface


62/93

0. elloLocal nterface0. elloLocal nterface

pac>age e=amples O

import Faa=.eF.&*+ocal!FectO

p2lic interace )elloocal e=tends Faa=.eF.&*+ocal!Fect

p2lic %tring helloGH O

Q



Clients interact ,ith the H4- Gbject through this Local interface ,hen there is no net,ork involved.'

As our reJuire#ent ,ants a business logic to greet ello World a single #ethod ,ould be sufficient .

As Local interface is used to interact ,ith the -ean ,e need to #irror all the #ethod signatures ,hat

are there in a -ean class so that is ,h& ,e are ,riting onl& one #ethod in this Local interface.

5ote As there is no re#ote calls no 8e#ote H3ception is thro,n


Gur interface ello is e3tending H4-LocalGbject #eans it has all the behaviour of H4-LocalGbject


As for ever& nterface ,e need i#ple#entation! so Container ,ill i#ple#ent autogenerate code/ for this Localnterface for us! ,hich is the H4- Local Gbject

1 The -ean Class1 The -ean Class


63/93

1. The -ean Class1. The -ean Class

pac>age e=amples O

import Faa.2til.RO

import Faa=.eF.RO

p2lic class )ello+ean implements Faa=.eF.%ession+ean

priate %essionConte=t ct=O

p2lic oid eFCreateGH %ystem.o2t.printlnGSeFCreateGHHO Q

p2lic oid eF'emoeGH %ystem.o2t.printlnGSeF'emoeGHHOQ

p2lic oid eFActiateGH %ystem.o2t.printlnGSeFActiateGHHOQ

p2lic oid eFPassiateGH %ystem.o2t.printlnGSeFPassiateGHHO Qp2lic oid set%essionConte=tGFaa=.eF.%essionConte=t ct=H

this.ct= ct=O Q

p2lic %tring helloGH %ystem.o2t.printlnGS)elloGHHO

ret2rn S)ello $orld/ S O Q

Q



This is ,here ,e ,ill code our -usiness logic

5ote < this is a class and not an nterface like the other t,o o#e 7 8e#ote/. This is i#ple#enting Session-ean so it is a Session -ean

This ejbCreate/ corresponds to the o#eobject Create/. 5GTH < in Stateless -ean no argu#ents are sent

So no, lets code the actual H4- Class

As per the belo, note in red ,e need to ,rite all the #ethods ,hat are in java3.ejb.Session-ean .

4ava does not support #ultiple inheritance so &ou can e3tend onl& one class. To overco#e

this the& had given us the #ple#entation option . So ,hen ,e use i#ple#ent ,e need toi#ple#ent or ,rite all the #ethods ,hat are there in the interface ,e i#ple#ented.

5GTH < f it is Hntit& -ean ,e ,ill i#ple#ent java3.ejb.Hntit&-eanand if it is %essage driven bean ,e ,ill i#ple#ent java3.ejb.%essagedriven-ean

These are called

%anage#ent or

Call back #ethods

Gur -usiness #ethod ,hich #atches

our 8e#ote nterface #ethod signature

n Statelss -ean ejbActivate

and ejb(assivate "o not appl&

There is nothing #uch to clean up.

Storing the Conte3t in a variable so that it can be Jueried later .

5GTH < -ecause it is a Session -ean ,e are using setSessionConte3t for Hntit& -ean ,e

use setHntit&Conte3t and for %essage "riven -ean ,e use set%essage"rivenConte3t.

#porting the reJuired files

2 The "eploent descriptor2 The "eploent descriptor


64/93

2. The "eploent descriptor2. The "eploent descriptor

U/!CT"P& eFJFar P#+IC SJ%2n Microsystems7 Inc. T &nterprise *aa+eans .0

&N S S httpLFaa.s2n.com.dtdeFJFarVV0.dtdW

UeFJFarW

UenterpriseJeansWUsessionW

UeFJnameW )ello UeFJnameW

UhomeWe=amples.)ello)omeUhomeW

UremoteWe=amples.)elloUremoteW

UlocalJhomeWe=amples.)elloocal)omeUlocalJhomeW

UlocalWe=amples.)elloocalUlocalW UeFJclassWe=amples.)ello+eanUeFJclassW

UsessionJtypeW%tatelessUsessionJtypeW

UtransactionJtypeWContainerUtransactionJtypeW

UsessionW

UenterpriseJeansW

UeFJFarW


As a -ean provider ,e need to specif& the %iddle,are needs through this descriptor.

So no, lets co#plete our H4- b& ,riting the deploent descriptor.

O%L Standard reJuire#ent

The nickna#e for this particular -ean

The full& Jualified na#e of the o#e nterface

The full& Jualified na#e of the 8e#ote nterface

The full& Jualified na#e of the Local o#enterfaceThe full& Jualified na#e of the Local nterface

The full& Jualified na#e of the H4- Class

Whether the session bean is stateful or stateless

T)&'& A'& MAN"

T!!% $)IC)

C'&AT&% T)&

&%C'IPT!'

(!' #%


65/93


66/93

. H4- 4ar Iile. H4- 4ar Iile

Properties

(ile

'emoteocal

Interace

)omeocal)ome

Interace

&nterprise

+ean Class

eployment

escriptor

*ar

Maniest

*ar

ile*ar Creator

&P!"&


*ar ile is a .ZIP compression ormat . M&TAJM( ile is a listing ile a2tomatically created y the *ar 2tility.

!r man2ally r2n CL[W*ar c )ello$orld.Far R

The folder structure ,ithin the Hjb'jar file is

%HTA'5I7%A5IHST.%I%HTA'5I7ejb'jar.3#l

e3a#ples7ello-ean.class

e3a#ples7elloLocalo#e.class

e3a#ples7elloLocal.class

e3a#ples7ello.class

Please read the eployment instr2ctions proided y the Application serer as it is ?endor speciic


67/93

D. H4- Application Asse#blerD. H4- Application Asse#bler

.*A' .$A'eployment

escriptor

eployment

Tool

&nterpriseArchie

G.&A' (ilesHGApplication.EMH

$&+ A'C)I&?& G.8arH

*%P

%erlets

)TM$&+.EM

*A' A'C )I&?& G.FarH

)!M&&*+

'&M!T&&*+J*A'.EM


*ar

ile


68/93


&EAMP&

%TAT&(# +&AN


69/93

Stateful Session 8e#ote nterfaceStateful Session 8e#ote nterface


package declaration should be in the beginning

#porting the reJuired classes

There ,ill not be an& i#ple#entation in nterfaces

H4- spec sa&s all re#ote interface #ethods need to thro, re#ote e3ception

Gur bean class Cart-ean #ethods are #irrored here

8e#ote Cart is e3tending H4-Gbject #eans Cart has all the behaviour of it

pac>age samples.eF.state2l.simple.eFO

import Faa.2til.RO

import Faa=.eF.&*+!FectO


import samples.eF.state2l.simple.tools.+oo>&=ceptionO

p2lic interace Cart e=tends &*+!Fect

p2lic oid add+oo>G%tring titleH thro8s 'emote&=ceptionO

p2lic oid remoe+oo>G%tring titleH thro8s +oo>&=ception7 'emote&=ceptionO

p2lic ?ector getContentsGH thro8s 'emote&=ceptionO

Q


70/93

Stateful Session o#e nterfaceStateful Session o#e nterface




There ,ill not be an& i#ple#entation in nterfaces

H4- spec sa&s all o#e interface #ethods need to thro, re#ote $ create e3ceptions

n a Stateful -ean &ou can have #ore than one create #ethod taking argu#ents

Carto#e is e3tending H4-o#e #eans Carto#e has all the behaviour of it

n our bean class Cart-ean these represent

ejbCreateString person/ $ejbCreateString person! String id/


import Faa.io.%erialiDaleO


import Faa=.eF.Create&=ceptionO

import Faa=.eF.&*+)omeO

p2lic interace Cart)ome e=tends &*+)ome

Cart createG%tring personH thro8s 'emote&=ception7 Create&=ceptionO

Cart createG%tring person7 %tring idH thro8s 'emote&=ception7

Create&=ceptionO

Q

St t f l S i - ClSt t f l S i - Cl


71/93

Stateful Session -ean ClassStateful Session -ean Class




as this is the -ean class ,e ,ill i#ple#ent the business logic here

Cart-ean Class is i#ple#enting sessionbean #eans this bean class is a session bean

5GTH < AS ,e are i#ple#enting and not e3tending ,e need to ,rite all the #ethods that are there in the Sessionbean

We defined this #ethod in the Cart re#ote interface.This also represents the o#e createString person/ #ethod


import Faa.2til.RO

import Faa=.eF.RO

import samples.eF.state2l.simple.tools.+oo>&=ceptionO

import samples.eF.state2l.simple.tools.Id?eriierO

p2lic class Cart+ean implements %ession+ean

%tring c2stomerNameO

%tring c2stomerIdO

?ector contentsO

p2lic oid eFCreateG%tring personH thro8s Create&=ception

i Gperson n2llH

thro8 ne8 Create&=ceptionG\N2ll person not allo8ed.\HOQ else

c2stomerName personO

Q

c2stomerId \0\O

contents ne8 ?ectorGHO

Q

S f S C


72/93

This loc> is a s2pporting 2siness method 8ritten in id?eriier class



We defined this #ethod in the Cart re#ote interfaceThis also represents the o#e createString person! String id/ #ethod ,e defined

The ne, operator is instantiating the instance of a class

We are calling the validateid/ #ethod fro# the class " 9erifier

We defined this #ethod in the Cart re#ote interface


We defined contents as a vector

p2lic oid eFCreateG%tring person7 %tring idH thro8s Create&=ception

i Gperson n2llH

thro8 ne8 Create&=ceptionG\N2ll person not allo8ed.\HO

Q else

c2stomerName personO

Q

Id?eriier idChec>er ne8 Id?eriierGHO

i GidChec>er.alidateGidHH

c2stomerId idO

Q else

thro8 ne8 Create&=ceptionG\Inalid idL \ B idHO

Q

contents ne8 ?ectorGHO

Q

p2lic oid add+oo>G%tring titleH contents.add&lementGtitleHO

Q

p2lic oid remoe+oo>G%tring titleH thro8s +oo>&=ception

oolean res2lt contents.remoe&lementGtitleHO

i Gres2lt alseH

thro8 ne8 +oo>&=ceptionGtitle B \ not in cart.\HO

Q

Q


73/93




We need to ,rite these #ethods as ,e are i#ple#enting Session-ean

8ules of i#ple#ent states ,e need to i#ple#ent all #ethods that are there in the i#ple#ented interface

-ean class constructor

p2lic ?ector getContentsGH

ret2rn contentsO

Q

p2lic Cart+eanGH Q

p2lic oid eF'emoeGH Q

p2lic oid eFActiateGH Q

p2lic oid eFPassiateGH Q

p2lic oid set%essionConte=tG%essionConte=t scH Q

Q


74/93

U-=ml ersion\1.0\ encoding\#T(J;\-W

U/JJ

Copyright 004 %2n Microsystems7 Inc. All rights resered.

%#N P'!P'I&TA'"C!N(I&NTIA. #se is s2Fect to license terms.

JJW

UeFJFar ersion\.1\ =mlns\httpLFaa.s2n.com=mlnsFee\ =mlnsL=si\httpL888.83.org001EM%chemaJ

instance\ =siLschemaocation\httpLFaa.s2n.com=mlnsFee httpLFaa.s2n.com=mlnsFeeeFJFarVV1.=sd\W

UdisplayJnameWCart*A'UdisplayJnameW UenterpriseJeansW

UsessionW

UdisplayJnameWCart&*+UdisplayJnameW

UeFJnameWCart&*+UeFJnameW

UhomeWsamples.eF.state2l.simple.eF.Cart)omeUhomeW

UremoteWsamples.eF.state2l.simple.eF.CartUremoteW

UeFJclassWsamples.eF.state2l.simple.eF.Cart+eanUeFJclassW

UsessionJtypeW%tate2lUsessionJtypeW

UtransactionJtypeWContainerUtransactionJtypeW Usec2rityJidentityW

U2seJcallerJidentityW

Usec2rityJidentityW

UsessionW

UenterpriseJeansW

Stateful "eploent "escriptorStateful "eploent "escriptor


reJuired b& an& O%L docu#ent

The nickna#e for this particular -ean

The full& Jualified na#e of the o#e nterface

The full& Jualified na#e of the 8e#ote nterface

The full& Jualified na#e of the H4- Class

-ean t&pe is #entioned here

Closing session and ejb

T)&'& A'& MAN"T!!% $)IC)

C'&AT&% T)&

&%C'IPT!'

(!' #%


75/93



(assing -ean class #ethods and para#eter info


UassemlyJdescriptorW

UcontainerJtransactionW

UmethodW


UmethodJintW'emoteUmethodJintW

UmethodJnameWgetContentsUmethodJnameW

UmethodW

UtransJattri2teW'e2iredUtransJattri2teW UcontainerJtransactionW


UmethodW



UmethodJnameWremoe+oo>UmethodJnameW

UmethodJparamsW

UmethodJparamWFaa.lang.%tringUmethodJparamW

UmethodJparamsW UmethodW

UtransJattri2teWNot%2pportedUtransJattri2teW



76/93





UmethodW



UmethodJnameWadd+oo>UmethodJnameW

UmethodJparamsW

UmethodJparamWFaa.lang.%tringUmethodJparamW

UmethodJparamsW UmethodW

UtransJattri2teW'e2iredUtransJattri2teW


UassemlyJdescriptorW

UeFJFarW


77/93


78/93

Stateful Session ClientStateful Session Client


We defined booklist as a vector

After storing in the variable MtitleN ,e are printing it

8e#oving a particular book using the bean class #ethod re#ove-ook throughre#ote interface Cart :as ,e defined it this ,a&

Cart shoppingCart ? ho#e.createQ"uke "eHarlQ!Q12;Q/P

We had ,ritten a ne, class -ookH3ception and using its #ethod to catch an& errors

&n2meration en2mer oo>ist.elementsGHO

8hile Gen2mer.hasMore&lementsGHH

%tring title G%tringH en2mer.ne=t&lementGHO

%ystem.o2t.printlnGtitleHO

Q

shoppingCart.remoe+oo>G\Alice in $onderland\HO

shoppingCart.remoeGHO

%ystem.e=itG0HO

Q catch G+oo>&=ception e=H

%ystem.err.printlnG\Ca2ght a +oo>&=ceptionL \ B e=.getMessageGHHO

%ystem.e=itG0HO

Q catch G&=ception e=H

%ystem.err.printlnG\Ca2ght an 2ne=pected e=ception/\HO

e=.print%tac>TraceGHO %ystem.e=itG1HO

Q

Q

Q


79/93

-ook H3ception-ook H3ception

pac>age samples.eF.state2l.simple.toolsO

p2lic class +oo>&=ception e=tends &=ception

RR

R ea2lt constr2ctor.

R p2lic +oo>&=ceptionGH

Q

RR

R Constr2ctor 8ith a UcodeW%tringUcodeW as a parameter.

R @param msg message7 descriing the e=ception.

R

p2lic +oo>&=ceptionG%tring msgH

s2perGmsgHO Q

Q



80/93

" 9erifier" 9erifier

pac>age samples.eF.state2l.simple.toolsO

p2lic class Id?eriier

RR

R ea2lt constr2ctor.

R p2lic Id?eriierGH

Q

p2lic oolean alidateG%tring idH

oolean res2lt tr2eO

or Gint i 0O i U id.lengthGHO iBBH

i GCharacter.isigitGid.charAtGiHH alseH

res2lt alseO

Q ret2rn res2ltO

Q

Q



81/93


82/93


83/93

&*+

e=ports operations thro2gh 'emote Interace

ActieE

e=ports operations in the same interace

C!'+A

e=ports methods thro2gh Interace 'epository

@.@. Co#ponentCo#ponent Co#parisonCo#parison

Components proide interaces in the orm o !perations



84/93

&*+

Containers inFect code to handle transactions7 dataase management7

sec2rity7 distri2taility and other c2stomisale serices. Containers

can e proided independent o App %erer and &*+ proiders

ActieE

Transactions7 dataase management7 legacy integration hae to e coded

into the logic o the component. %ec2rity policy can e inherited rom

NTM. Transactions can e aided thro2gh MT%

C!'+A

C!'+A%erices hae dierent APIs. C!'+A%erices can e complicated

to code 8ith. C!'+A%erices are not s2pported y all !'+s

B.B. Co#ponentCo#ponent Co#parisonCo#parison

%el Container Components



85/93


86/93

&*+

&ents s2pported thro2gh *M% 8ith Message

rien +ean

ActieE

e=ports &ents in the same interace

C!'+A

&ents s2pported thro2gh &ent %erice 2t cannot

e e=ported

@0.@0. Co#ponentCo#ponent Co#parisonCo#parison

Components proide interaces in the orm o &ents.



87/93

&*+

Incorporating the contents o an &*+ can e done

in t8o 8aysLF y haing the ne8 &*+ 2se the serices o an old

&*+ as a direct client

or

F y 8riting an &*+ class that inherits rom an

e=isting one

These t8o methods o leeragaility gie deelopers

ma=im2m le=iility

@1.@1. Co#ponentCo#ponent Co#parisonCo#parison

Component 'e2saility



88/93

@; C t C i


89/93

C!'+A

&ery C!'+A oFect has to hae its o8n interace

deinition

C!'+A oFects can 2se the serices o other !Fects

No mechanism or inheritance or !Fect re2se

inherently s2pported7 tho2gh

@;.@;. Co#ponentCo#ponent Co#parisonCo#parison

Component 'e2saility


@ CC t CC i


90/93

&*+

Application %erer ma>es m2ltiple instances o &*+ !Fects. Client

conte=ts can e stored in dierent thread conte=ts. ierent types

o &*+s identiy leels o shareaility.

ActieE

2ses Microsot^s inprocesso2tJoJprocess architect2re or sharing

m2ltiple ActieE components and Client components.

C!'+A

!'+ ma>es m2ltiple instances o C!'+A oFects. Clients conte=ts are

managed y !'+ 2t can ehae dierently ased 2pon endors

Implementation.

@.@. Co#ponentCo#ponent Co#parisonCo#parison

Components %hareaility


@D@D ConclusionConclusion


91/93

I yo2 hae any comments or appreciations then please email him at

[email protected] [email protected]

)e li>es to hear yo2r eed ac>/

C!N'AT#ATI!N%/No8 yo2 >no8

as m2ch as he

>no8 o &*+

@D.@D. ConclusionConclusion


$e s2ccess2lly completed a To2r on &*+ . $e loo>ed at ho8 an &*+ is identiied. )o8 manydierent types o &*+s are there and 8hat each &*+ type implements. $hy

ocalInteraces 8ere introd2ced. $e disected the &*+ and 8ent deeper into each part i.e. +&AN

Class7 'emote Interace7 &*+ !Fect7 ocal !Fect7 ocal Interace7 )ome !Fect. $e loo>ed

Into the deployment descriptor and also seen all the iles in &*+*ar. $e loo>ed into each

+eans

Methods and also learned 8hy 8e needed those methods. $e had done dierent +eans

e=amples and 8e 8ere directed to the $e lin>s 8here all the e=amples are demonstrated.!nce

yo2 can get an idea o all the Interaces7 methods 9 e=ceptions raised7 yo2 can attempt to

try

some e=amples to get amiliar and master &*+. There are nearly 100s o Application serers

2t in this presentation yo2 can see a e8 maForly 2sed App%erers sample

implementation

8e lin>s. *2st do8nload any one o them and try o2t or yo2rsel.

@.@. 8eferences8eferences


92/93

Application %erers do8nload inormation . Most o them are either ree or hae a 60 day trial ersion

8H"ATApplication Server and H3a#ples

http


93/93

Complete EJB PPT

Documents

Transcript of Complete EJB PPT