Java Module 5 Jms

7/29/2019 Java Module 5 Jms

1/38

Ove

rview

Describetheconceptsand

somepracticalapplications

ofmessaging.

Describetheconceptsand

basicstructureofJ

MS.

WritesimpleJMSmessaging

codeusingthepublishand

subscribeandpoint-to-point

domains.

DiscussadvancedJ

MSissues

suchasguaranteed

messaging,transactions,

reliability,andrecovery.


2/38

Par

t1:

Ente

rpriseM

essaging

an

dJMS


3/38

Enterpr

isemessaging

Message-

Oriented

Middlewar

e

ApplicationA

MessagingAPI

M

essagingClients

ApplicationB

MessagingAPI

Messa

gingClients


4/38

T

ightlyCoupledRPC

Business

ApplicationA

RPC

Client/Server

Business

ApplicationD

RPC

Client/Server

Business

Applica

tionB

RPC

Client/Server

Business

Applic

ationC

RPC

Client/S

erver

Requiresn*(n

-1)/2

connections


5/38

JMS

messaging

JMS

Client

Message

Server

JMS

Client

JMS

Client

JMS

Client

JMS

Client

JMS

C

lient

JMS

Client

Local"server"

JMS

Client

Local"server"

JMS

Client

Local"server"

JMS

Client

Application

A

Local"serv

er"

Applic

ationB

ApplicationC

ApplicationD

Router

Decentralizedmessagese

rver

(IPmu

lticast)

Centralizedm

essageserver

(hubandspo

ke)


6/38

TheJ2E

Eplatform C

lient

Application

JMS

Server

EJB

Container

Web

Container

Application

Client

Container

JDBC

D

atabase

J2EEPlatform


7/38

Pa

rt2:

JMSConce

ptsand

C

oding


8/38

Wholes

alerandretailer

Message

Server

Wholesale

r

Retailer1

Retailer2

Updateprice

(publish)

Orderproduct

(send)


9/38

JMSfeatures

StandardJavaAPI

Messag

edeliverymodes

Twomessagingmodels

Transactions

Reliabilitylevels

Persistentmessaging


10/38

JMSmessagingdomain

s

Publishandsubscribe

Manyco

nsumersperme

ssage

Point-to-point

Oneconsumerpermessage


11/38

m

anagement

Publish

er

Publish

er

Subscr

iber

Subscr

iber

Topic

Topic


12/38

--

GoodsShipped

GoodsShipped

Queue

NeedSupplies

NeedSupplies

Send

er

Receiver


13/38

JM

Scomponents

Message

Server

Message

Message

Destination

JMSClient

Connection

Session

Producer

JMSClient

Con

nection

Session

Consumer


14/38

Con

nectionsandsessions

A

connectioncon

nects

toamessageserv

er.

Y

oucancreateoneor

m

oresessionswi

thina

connection.

JMSClient

Connection

Session

Session

Session


15/38

Creatingconnection

sandsessions

Message

S

erver

JND

IStore

JMSClient

Connection

Session

Session

Session

ConnectionFacto

ry

create

ConnectionFactories

Destinations


16/38

JM

Smessagetypes

As

tream

ofun

inte

rpre

tedby

tes

Bytes

Message

As

tream

ofJavap

rim

itives

Stream

Message

Ase

to

fname

/valu

epa

irsw

hereva

lues

are

Java

prim

itives

Ma

pMessage

Aseria

liza

bleJava

objec

t

Ob

jec

tMessage

As

tan

dard

Javas

tring

Tex

tMessage

No

bo

dy

Me

ssage

Message

bo

dy

Me

ssage

type


17/38

Creatingamessage

createStreamMessa

ge(

);

StreamMessage

TopicSession

cr

eateTextMessage(

);

TextMessage

Qu

eueSession


18/38

JM

Smessagehead

ers

A

utoma

tica

lly

ass

igne

dhea

ders

JMSDes

tina

tion

JMSDe

livery

Mo

de

JMSMessageID

JMSTimes

tamp

JMSExp

ira

tion

JMSRe

de

livere

d

JMSPriori

ty

D

eve

loper-ass

igne

d

h

ea

ders

JMSRep

lyTo

JMSCorre

lation

ID

JMSType


19/38

Producers

,consumers,anddestinations

Message

Server

Se

nd

message

Consume

message

Destination

Producer

Bind

to

destination

Cons

umer

Read

message

Bindto

destination


20/38

Creatingd

estinations

M

essage

Server

JND

IStore

JMSClien

t

Topic

Queue

ConnectionFactories

Destinations

lookup


21/38

Pro

ducingamessage

createmessage

producem

essage

Session

Mes

sageProducer

Messa

ge

De

stination

create


22/38

Consumingmessag

es

Incomingmessages

MessageListener

onMessage(m

essage);

Message

Serv

er

acknowledge

MessageCo

nsumer

Message

rec

eive();

Incomingmessages

acknowledge


23/38

Asynchronousmes

sagedelivery

Incomingmessages

MessageListener

onMessage(message);

Message

Serv

er

acknowledge


24/38

Usingreceive()

Incomingmessages

MessageCon

sumer

Message

receive();

Message

Serv

er

acknowledge


25/38

Filteringwithmessageselector

Message

Server

Publisher

Departments.Sales

Subscriber

Departm

ents.Sales

Pipeline

>15000

JMSPriority=2

Pipeline=20000

delive

red

Subscriber

Departments.Sales

JMSPriority>5

not

delivered

Subscriber

D

epartments.Sales

JMSPriority>=2ANDPipeline>10000

delivered

Sub

scriber

Depar

tments.Sales

Pipeline>20000

not

delivered


26/38

Browsingaqueue

nextElement();

QueueBrowser

g

etEnumeration

();

Message1

Message2

Message3

Message4

Enumeration


27/38

Accessingmessagecontent

Message

TextMessage

MapMessage

ObjectMessage

StreamMessage

BytesMessage

getText();

getObject();

get(Name);

read();


28/38

Part

3:

Guar

an

teed

messag

ing


29/38

Guar

anteeingmessag

edelivery

Durable

Subs

criber

Or

QueueReceiver

Producer

Message

Server

PERSISTENTmessage

Persistentstore

Messag

eremoved

afteracknowledgment

Acknowledge

message


30/38

Persistentandnon-

persistentmessages

Message

Server

Persistentstore

Non-persiste

ntmessage

notguarante

edto

surviveprov

iderfailure

Persistentmessage

guaran

teedtosurvive

providerfailure


31/38

Acknowledgement

modes

AUTO

CLIENT

DUPS_O

K

Igotanother

message!

Itmightbeeasyfor

youtotellmethat

foreverymessage,

butyouareu

singa

lotofbandwidth.

Ireceivedall

me

ssagesup

tothispoint.

Wherehaveyoubeen?I

havebeen

waitingto

delete50m

essages.

Consume

r

Server

Whenyouarelazylike

this,Imighthaveto

deliversomemessage

s

morethanonce.

Okay,Imightseem

lazyto

you,butitisnotim

portantto

meiftherearesom

eduplicates.


32/38

Du

rablesubscribers

Durable

Subs

criber1

(connected)

Publisher

Message

Server

PER

SISTENTmessage

Persistentstore

Undeliveredmessages

deliveredtoSubscriber2

whenreconnected

Durable

Subs

criber2

(n

ot

conn

ected)


33/38

Redeliv

eredmessages

Beforemessageserverreceivesackn

owledgement:

Mes

sageserverhas

failedandrestar

ted

OR

Con

sumerhasfailed

andrestarted C

onsumer

Message

Server

JMSRedeliv

ered=true


34/38

Part

4:

Transac

tionsan

drecov

ery


35/38

Tra

nsactedsession:Producer

Pr

oducer

Message

Server

Cons

umer

Be

forecommit(

)

Uponcomm

it()

Message

Server

Tra

nsacted

s

ession


36/38

Tra

nsactedsession:Consumer

Message

Server

Consumer

Beforecommit()

Up

oncommit()

Message

Serve

r

Consum

er

1

2

Delivermessages

Consume

messages

1

2

Acknowled

ge

messages

Delete

messagesifall

recipien

tshave

acknowledged


37/38

Distribute

dtransactionsupport

M

essage

Server

JND

IStore

JMSClient

XAConnection

XASession

XASession

XASession

XAConnectionFactory

create

ConnectionFactories

Destinations


38/38

Recoverin

gfromalost

connection

Clientru

ntime

Messa

ge

Server

Excep

tionListener

onExc

eption()

Reconnec

t

Documents

Java Module 5 Jms