IS2103 - Summary

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QUICK REFERENCE GUIDE

Chapter 2 Distributed Computing

Remote Method Invocation (RMI)

Use: RMI is a mechanism for enabin! an ob"ect in one #$M to comm%nicate remote&'ith an ob"ect in another #$M ith RMI* ob"ects can be caed remote&* reso%rces can

be shared and +rocessin! oad distrib%ted over a n%mber of com+%ters RMI aso+romotes location transparency

E,ec%tion:

- .erver binds an ob"ect to a name via Naming.rebind(AddServer,addServerImpl!

/ Generate stuband s"eleton(de0nitions in 1ect%re - +! -2)3 .tart RMI re!istr& via start rmiregistr#in the command +rom+t$. Cient oo4s %+AddServerin re!istr& via

Naming.loo"up(rmi%&&'I o) server, *2+...* )or lo-al&AddServer!

Im+orts

"avarmiNamin! 5o ca Namin! cass methods

"avarmiRemote publi- inter)a-e AddServer e/tends 0emote 16

"avarmiRemoteE,ce+tion 5o ao' thro'in! of RemoteE,ce+tion

#avarmiserverUnicastRemote7b"ect

De0nes a non8re+icated remote ob"ect 'hosereferences are vaid on& 'hie server +rocess is aivepubli- -lass AddServerImpl e/tendsni-ast0emote3b4e-t implements AddServer 1

Reference: 5e,tboo4 +! -9 -;

#ava Namin! Director& Interface (#NDI)

Use:

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"ava%ti=ro+erties 5o set +ath %r

"ava,namin!Namin!En%meration

"ava,rmi=ortabeRemote7b"ect

Used instead of UnicastRemote7b"ect in rmi

Reference: 5e,tboo4 +! /? /@

/

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Chapter ? 0;I@II3

De0nitions:

8 C7R>< (Common 7b"ect ReA%est >ro4er

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Chapter $ eans +! 3

Midde'are ta4es care of other services that are essentia for the e,ec%tion of beans5hese services inc%de database inte!rit& chec4s* sec%rit&* transactions* etc 'ithmidde'are* the desi!n of enter+rise beans does not have to e,+icit& ta4e care ofthese services since the& are no' dee!ated to the midde'are

8 Im+icit: Usa!e of midde'are services is decared thro%!h a separate descriptortext-fle* or coded 'ithin an enter+rise bean %sin! annotation

8 E,+icit: rite ever& midde'are &o%rsef

F%rther e,am+es 5e,tboo4 +! 2

E#> Com+onent 5&+es:

- Cient 7b"ects e! servets* #.= +a!es/ .erver 7b"ects e! messa!e driven beans* mana!er beans* session beans

coective& Enterprise Beans3 E#> Container: res+onsibe for mana!in! enter+rise beans

o Does a ot of midde'are services for the beanso .ec%rit&o 5ransaction mana!emento Remote accessibiit&o Reso%rce and ife c&ce mana!emento C%sterin! and oad baancin!o Conc%rrent reA%ests s%++ort

RMI8II7= vs E#>

Remote interface for the server

ob"ect

1ocaRemote b%siness interface for enter+rise

beanIm+ement remote interface rite a de+o&ment annotated enter+rise bean

cass that im+ements b%siness interfaceInterface and enter+rise bean cass forms E#>com+onent

Cient a++ to invo4e server ob"ectsmethods

Cient a++ to invo4e enter+rise beans methods

Generate st%b and s4eetons Container +rovides midde'are service thatcreates st%b and s4eeton

.erver a++ication Com+onent deveo+ed forms server a++ication

.tart re!istr& Start com+onent in the

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.erver

R%n Cient a++ication 0unCient a++ication

Refer to 5e,tboo4 pg *2 for im+ementation ofNDI loo"up in

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Chapter E Session Beans or eans: In sit%ations 'here memor& is imited*the +%shin! aside of session beans to secondar& memor& is 4no'n as

passivation@ >%siness interface: eans< session bean is a server8side ob"ect re+resentin! 'or4 to be done on behaf of thecient cain! it It im+ements b%siness o!ic* a!orithm* b%siness r%es or 'or4o'For e,am+e* +erformin! order entr&* 'ithdra'in! f%nds from ban4 acco%nt*

+rod%cin! +rice A%otes* etc are t&+ica b%siness +rocesses that 'e can %se sessionbeans for.tatef%

Kee+ the data s+eci0c to the cient the& are servin! and ao' the +assin! ofdata bet'een method cas

.tateess

Do not maintain an& data associated 'ith cients the& are servin! interna&*no +assin! of +arameters across method cas therefore a stateess sessionbeans instances are eA%ivaent and indistin!%ishabe to an& cient

Messa!e Driven >eansMessa!e driven beans can on& be caed to send messa!es MD> doesnt have aninterface* hence* cannot be caed i4e in a session bean 5&+ica %se issendin!recei+t of trade messa!es s%ch as credit card info

MD> ma& send messa!es to other MD> or invo4e methods direct& on E#>s 'hen amessa!e is received

E,ec%tion:

- rite the (oca or remote) b%siness interface for the enter+rise beansF0emote+%bic interface eanRemote H

/ rite a de+o&ment annotated enter+rise bean cass that im+ements theb%siness interface

FStateless

+%bic cass ean im+ements eanRemote H3 rite a cient a++ication that invo4es the enter+rise beans methods

+%bic cass

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"ava,e"b.tatef% .tatef%

"ava,e"bE#> E#>

Reference: 5e,tboo4 +! 2?

?

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1ife C&ce of .ession >eans

1ife C&ce Cabac4 Methodsimitations o) State)ul Session Beans

hen a ne' a++ication cient is e,ec%ted* a ne' session bean is instantiated and+revio%s& created c%stomer is no on!er avaiabe ence .tatef% session beans arenot s%itabe for +ersistin! ob"ect data be&ond an a++ication r%n

Usin! a .tatef% session bean to re+resent a c%stomer mere& stores the c%stomersdata in com+%ter memor& hen the session is terminated* the b%siness data are asodestro&ed

;

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Chapter G ersisten-e ;anagement

Entities:

8 =ersistent data ob"ect in the #ava =ersistence s+eci0cation8 Entit& casses are Plain Old Java Objects not enter+rise beans

8 Entities are oca ob"ects that cannot be direct& accessed from a remote ocation session beans

8 Entities +ossess =ersistent identit& that distin!%ishes one entit& from another8 Entit& is an in8memor& #ava ob"ect that re+resents +ersistent data stored in

+ermanent data stora!e

Entit& Instance .tate

8 Mana!ed: 5he mana!er trac4s state chan!es to the entit& and s&nchroniesthose chan!es to the database 'henever the entit& mana!er decides to %sh itsstate

8 Unmana!ed:

o %sh() : void .&nchronie chan!es done on entit& instance in

+ersistence conte,t 'ith D>createQ%er&(.trin! name) :Q%er&

Create an instance of Q%er&

Im+orts

@

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"ava,+ersistenceEntit& Entit&(name Osomethin!P

"ava,+ersistencetabe 5abe(name Otabe nameP

"ava,+ersistenceEntit&Mana!er

=ersistenceConte,tEntit&Mana!er emS

"ava,+ersistence=ersistenceConte,t

Chapter + Implementing Business 3b4e-t ersisten-e

Im+orts:

"avaio.eriaiabe +%bic cass GiftEntit& im+ements SerialiHableH

"ava,+ersistenceEntit& Entit&

"ava,+ersistenceEntit&1isteners

Entit&1isteners (38I3NA>

"ava,+ersistenceGenerated$a

%e

Generated$a%e(strate!&Generation5&+eac4cassim+ementation

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DD> to ava

import javax.persistence.(olumn;

import javax.persistence.Entity;

import javax.persistence.d;

import javax.persistence.Table;

"Entity

@Table(name="CUSTOMER_TABLE")

public class (ustomerEntity implements java.io.Serializable ,

private Long d;

private String name;

private String title;

"d

@Column(name="PASSENGER_ID", nullable=!ale, #olumnDe!$n$%$on="$n%e&'e&")

public Long getd#' , return d; 1

public void setd#Long d' , t2is.d $ d; 1

@Column(name="PASSENGER_NAME", len'%=*, nullable=!ale)

public String get0ame#' , return name; 1

public void set0ame#String name' , t2is.name $ name; 1

@Column(len'%=+*)

public String getTitle#' , return title; 1

public void setTitle#String title' , t2is.title $ title; 1

Finter)a-e Column

public @$n%e&!a#e(olumn , String name#' de&ault %%;

String table#' de&ault %%;

boolean uni!ue#' de&ault &alse;

boolean nullable#' de&ault true;

boolean insertable#' de&ault true;

boolean updatable#' de&ault true;

String columne&inition#' de&ault %%;

int lengt2#' de&ault 344;

int precision#' de&ault +;

int scale#' de&ault +;1

--

Chan!e tabe name fromC%stomerEntit& (defa%t) to

- Rename co%mn Id to =

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"ava,+ersistenceIdCass "ava,+ersistenceE"ava,+ersistence

=rimar&

s

+%bic cass =assen!er=K im+ements .eriaiabe H+rivate .trin! nameS+rivate .trin! +ass+ortNoS

F

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Chapter J 8ransa-tions

< transaction m%st be atomi-* -onsistent* isolated and durable ( is in harmon& 'ith the rea 'ord it re+resents

Isoated: 5ransaction ao'ed to e,ec%te 'itho%t interference from other +rocessesor transaction

D%rabe:

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Chapter ravoEntit&P()S

6

+%bic cass >ravoEntit& HONothin! .+eciaP6

M8- -8M>i

=!-3

+%bic cass ravoEntit& bS6

8he ;an# side is theo6ning side

+%bic cass >ravoEntit& H7ne5oMan&(ma++ed>&b*cascadeHV)+rivate .etOravoEntit&P()S

6

+%bic cass >ravoEntit& HONothin! .+eciaP6

M8M>i

=!-;@

+%bic cass ravoEntit&P b

ne'ash.etO>ravoEntit&P()S

6

+%bic cass >ravoEntit& HMan&5oMan&(ma++ed>&b*cascadeHV)+rivate .etO

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Im+orts:

"ava,+ersistence7ne5o7ne

7ne5o7ne

"ava,+ersistence7ne5oMan&

7ne5oMan&

"ava,+ersistenceMan&5oMan&

Man&5oMan&

"ava,+ersistenceMan&5o7ne

Man&5o7ne

"ava,+ersistenceCascade5&+e

cascadeHCascade5&+e=ER.I.5VV MERGE REM7$E REFRE.

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Im+orts in servet

"ava,servetReA%estDis+atcher

ReA%estDis+atcher dis+atcherS.ervetConte,t servetConte,t !et.ervetConte,t()S

dis+atcher servetConte,t!etNamedDis+atcher(+a!e)"ava,servet.ervetConte,t

"ava,servet.ervetE,ce+tion ReA%ired for doGet and do=ost 'hich are defa%tmethods

"ava,servethtt+tt+.ervet +%bic cass >R..ervet e,tends tt+.ervet H

"ava,servethtt+tt+.ervetReA%est

"ava,servethtt+tt+.ervetRes+onse

;ust al6a#s import 0emote inter)a-e -lass i) 6e need to -all manager bean

"s+

-9

78

5rrayList bookList $ #5rrayList're!uest.get5ttribute#%data%';

&or#6bject o9 bookList' ,

String book $ #String'o;

StringTokenizer st $ ne: StringTokenizer#book) %%';

8istener 5 ne6 Mueue>istener(!Consumer.set;essage>istener(ueue>istener!

5'o t&+es of messa!in! domains:

8 =oint8to8+oint: Q%e%e

8 =%bish.%bscribe: 5o+icMessa!es can be cons%med in t'o 'a&s:

8 .&nchrono%s&: < receiver e,+icit& fetches the messa!e from the destination b&cain! the receive() method 5he receive() method can boc4 %nti a messa!earrives or can time o%t if a messa!e does not arrive 'ithin a s+eci0ed time imit

8

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Chapter *2 ;essage Driven Beans

< messa!e driven bean is a stateess* server8side enter+rise bean ca+abe of +rocessin!messa!es based on the #M. eanRefer to +rinted sam+e

Messa!eDriven>ean

Refer to +rinted sam+e

Im+orts for .ession >ean

"ava,annotationReso%rce

Reso%rce(ma++edName W"ms5o+icConnectionFactor&W)+rivate ConnectionFactor& to+icConnectionFactor&Sto+icConnection

to+icConnectionFactor&createConnection()S

"ava,"msConnectionFac

tor&"ava,"msConnection

"ava,"ms.ession .ession session to+icConnectioncreate.ession(fase*.essionean

"ava,e"bMessa!eDriven Messa!eDriven

"ava,e"b

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-@

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Se-urit#Invoves:

- &Credit(C%stomer c%stomer* CreditCardD7card* do%be amo%nt) thro's =a&mentE,ce+tion H VV

Refer to sides

im+ort "avaan!annotationRetentionSim+ort "avaan!annotation5ar!etS

5ar!et(H5L=E* ME57DV) Retention(RUN5IME)

+%bic interface Roes

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ort Number

RMI Defa%t =ort: -@@

#NDI 5ransient Name .erver: @

55= (&+erte,t 5ransfer =rotoco): ;

55= oo4Entit&P b ne'CoectionO>oo4Entit&P()

"ava%tiash.etS ash.etO>oo4Entit&P b ne' .etO>oo4Entit&P()

"ava%ti.etS"ava%tiDate Date d ne' Date()DateFormat df ne'.im+eDateFormat(WMMdd&&&&W)S.trin! str dfformat(d)S

"avate,tDateFormat

"avate,t.im+eDateFormat

"ava%ti5em+ora 5em+ora(va%e 5em+ora5&+eDased on the .e+aration of Concerns +rinci+e .e+arate the cient tier* b%siness o!ictier and data tier from each other 5his enhances maintainabiit& of individ%acom+onents so chan!es to one 'o%dnt aBect others

Mode: Inc%des data and b%siness o!ic com+onents E! enter+rise beans and entities

$ie': Dis+a& of b%siness data #.= +a!es

Controer: >rain of the 'eb a++ication Receives cient reA%ests* +rocesses them*for'ards them to com+onents that +rocess data* and directs res%ts of the +rocessin!to View com+onents E! servets

3b4e-t@0elational ;apping

/-
http://en.wikipedia.org/wiki/Domain_Name_Systemhttp://en.wikipedia.org/wiki/Domain_Name_System

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7R Ma++in! refers to the ma++in! of an entit&s state to reationa database tabe andco%mns

S#stem In)rastru-ture Considerations

Refer to 5e,tboo4 +! /

//

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IS2103 - Summary