1. MIDDLE WARE TECHNOLOGIES
B.TECH III YR II SEMESTER
UNIT 8 PPT SLIDES
TEXT BOOKS:
1.Client/Server programming with Java and CORBA Robert Orfali and Dan Harkey, John Wiley & Sons,SPD 2nd Edition
2. Java programming with CORBA 3rd Edition, G.Brose, A Vogel and K.Duddy, Wiley-dreamtech, India John wiley and sons

2. INDEX UNIT 1 PPT SLIDES S.NO. TOPIC LECTURE NO. PPTSLIDES
Object transaction monitors L L1.1 to L1.4
L L2.1 TO L2.4
2. EJB and CORBA OTM’s L L3.1 TO L3.3
L L4.1 TO L4.2
3. session and Entity Beans L L5.1 TO L5.2
4. The EJB client/server development L L6.1 TO L6.2
5. EJB container protocol L L7.1 TO L7.2
6. EJB packing L L8.1 TO L8.2

3. UNIT8 SYLLABUS EJBS and COBRA:
Object transaction monitors CORBA OTM’s EJB and CORBA OTM’s EJB container frame work, session and Entity Beans, The EJB client/server development processes the EJB container protocol, support for transaction EJB packing EJB design Guidelines.

4. IS A STNDARD SPECIFICATION WHICH
EJB DEFINITION
EJB
IS A STNDARD SPECIFICATION WHICH
ALLOWS US TO DEVELOP A DISTRIBUTED TRANSACTIONAL SECURE COMPONENTS IN JAVA
Lecture 1 slide 1

5. EJB COMPONENT
IS A COMBINATION OF SOMECLASSES AND INTERFACES DESIGNED FOLLOWING THE EJB SPECIFICATION STANDARDS.
Lecture 1 slide 2

6. EJB CONTAINER
is a readymade platform which is a rich of all the low-level services which can provide runtime environment for ejb components.
Lecture 1 slide 3

7. EJBS AND CORBA Enterprise JavaBeans and CORBA
Object transaction monitors, CORBA OTM’s, EJB and CORBA OTM’s, EJB container F/W, session and Entity beans, The EJB C/S development process, The EJB container protocol, support for transaction, EJB packaging, EJB design guidelines.
OTMs
An OTM is a morph of TP monitor with an ORB.
Or, in other words, it is a TP monitor built on top of an ORB.
An ORB is simply an object bus, with an object bus, anytime goes, in contrast, an OTM provides a framework, for running server-side components.
Lecture 1 slide 4

8. EJBS AND CORBA Procedural Vs F/W Appraches to Developing code
Advantages of OTM’s approach: Yours objects become managed transactional, robust , persistent and high-performing.
Functions of OTM:
Activates and deactivates your components
Coordinates distributed transactions.
Notifies your component of key events during its life style.
Lecture 2 slide 1

9. EJBS AND CORBA
Automatically manages the state of your persistent component.
CORBA OTM’s : from four groups
TP Monitor vendors moving to ORB-based middleware.
ex: BEA Iceberg, IBM component broker.
DBMS Vendors moving from 2-tier to 3-tier.
ex: oracle app. Server 4.0, Gene stone/J, Sybase/jaguar.
ORB vendors moving from pipes to TP – based app. servers.
ex: Iona orbix OTM, Visigenic/Borland ITS
Web server vendors moving to TP-based app. servers
ex: Net Dynamics App. server 4.0, Netscape Enterprise server 4.0/kiva, sapphire/web 4.0
Lecture 2 slide 2

10. EJBS AND CORBA EJBs and CORBA OTMs:
EJB defines a server side component model and a comp. coordinator f/w that is totally compatible with CORBA.
The EJB Container F/W
The major functions a server-side container (or OTM) provides to the EJBs that run within it.
Packaging
Dist.obj.infrastructure
Comp.packaging and deployment
Declarative trans. Mgnt.
Lecture 2 slide 3

11. EJBS AND CORBA Factory support Bean activation and persivation
Bean state mgnt.
Container metadata
Security
Session and Entity Beans:
Characteristics of a session bean
Lecture 2 slide 4

12. EJBS AND CORBA Executes on behalf of a single client
Can be transaction – aware
Updates data in an underlying data base.
Relatively short-lived, life time is that of its client.
Destroyed when the EJB server crashes; client has to a new session
Does not represent data that should be stored in a data base.
Lecture 3 slide 1

13. EJBS AND CORBA Characteristics of an Entity bean
Supports shared access from multiple users.
Participates in transactions
Represents data in the data base.
Can be ling-lived (as long as the data base).
Survives crashes of the EJB server; crash transparent to the client
Has a persistent obj.ref.
Lecture 3 slide 2

14. EJBS AND CORBA EJB Packaging
Extends the existing javabeans packaging technology to take car of the needs of server side beans.
EJB packaging can be used to distribute a single enterprise bean or to distribute an entire server-side application built of multiple enterprise beans.
EJB-JAR and manifest – list-java file contains
EJB’s class files
Deploy base
Manifest that identifier the enterprise bean included in the JAR.
Lecture 3 slide 3

15. EJBS AND CORBA The manifest is named META-INF/MANIFEST.MF.
EJB Design Conditions:
Your remote interface must follow the CoRBA/MI/IDL subset.
Define a remote interface.
Dont mess around threads
Don’t issue commits or roll backs.
Give your containers a full EJB-jar package.
Lecture 4 slide 1

16. EJB ARCHITECTURE
Lecture 4 slide 2

17. FRAMEWORK
Lecture 5 slide 1

18. OTM
Lecture 5 slide 2

19. EJB container class
Lecture 6 slide 1

20. EJB client/server process
Lecture 6 slide 2

21. The remote EJB interface
Lecture 7 slide 1

22. EJB deployment classe
Lecture 7 slide 2

23. IDL interface and stubs
Lecture 8 slide 1

24. Java classes and interfaces
Lecture 8 slide 2