Common Object Request Broker Architecture (CORBA)

Common Object Request Broker Architecture (CORBA)

Object Request Broker (ORB)fundamental part of the CORBAORB is the distributed service that

implements the request to the remote object.

Help a client to invoke a method on an object.

Object Request Broker (ORB)The ORB is responsible for:i. Data marshalingii. Object location managementiii. Delivering request to objectsiv. Returning output values back to client

What is CORBA ?Middleware design that allows application

programs to communicate with one another irrespective of their programming language, hardware, software, networks they communicate over and implementors.

Object-oriented programmingObjects are accessible through interface

only

Allows objects to transparently make requests and receive responses

CORBA is location transparenti. in different process on another processor ii.on the same processor, in a different

processiii.on the same processor and even in the

same process

Architecture of CORBA

Architecture of CORBA3 additional components : i. Object adapterii. Implementation repositoryiii.Interface repository

Interface Definition Language (IDL)Is the language used to define

interfaces between application components.

Applications are not programmed in IDL. IDL is not a procedural language; it can

define only interfaces, not implementations.

Provides facilities for defining modules, interfaces, types, attributes and method signatures.

Language MappingAre basic for actual implementation of the

object in the respective programming language

Primitive types in IDL are mapped to the corresponding primitive types in Java.

Holder classes are provided for parameter passing semantics of IDL onto those of Java.

IDL Type Java Type short, unsigned short short

boolean boolean

char, wchar char

long long, unsigned long long long

Portable Object Adapter (POA)

CORBA 2.2 standard for object adapters is called POA.

Portable – allows applications and servants to be run on ORBs produced by different developers.

Advantages of CORBACan deal with heterogeneous systemsCORBA is a mature technology, support

and tools are widely availableCORBA allows methods on a remote object

to be accessed as if they were on the local machine

Design Features

Design Features (cont..)

Design Features (cont..)

The End…