que es Corba

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CORBA Common Object Request Broker Arquitecture

• Common Object Request Broker Architecture
  (CORBA)
• CORBA is a standard specification. Not a software
  nor a particular program.
• Set up by the Object Management Group (OMG), to
  establish an object based standard for
  inter-platform interoperability
• OMG was found in 1989, by American Airlines,
  Canon, Data General, HP, Philips
  Telecommunications, Sun , 3Com Unisys. Many
  joined later
• There a big number of CORBA implementation. These
  are known as Object Request Broker (ORB)

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What does Corba provides?

• Applications, client server processes
  representing the logic of the business how
  objects can reside in different machines.
• Middleware.supporting communication between
  applications.
• Network services. Transport of information
  between computers.
• Local services, like databases and transaction
  managers.
• Operative System providing basic services of
  hardware and services.

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What problem does CORBA solves?

• Middleware Definition...

......A set of common services not related to
the business logic of a particular application,
which allows server and client applications
interact with each other in a network. In
essence, Middleware is the software which resides
over the network, allowing software developer to
concentrate only in the business logic of the
applications instead of protocols solutions.
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What problem does CORBA solves?

• Importance of the Middleware.

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What problem does CORBA solves?

• Examples of Middleware.
• Electronic mail.
• Groupware products like Lotus Notes.
• Web Browser, Web gateways.
• Sql Gateways.
• Electronic Data Interchange packages (EDI).
• Remote procedure Call (RPC) packages.
• Distributed Object servers like CORBA.

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How does it work ?

• The principal concepts in CORBA are
• Essentially, it specifies the services the
  middleware will provide to the applications
  (Objects).
• There is an interface between client and server
  applications. An Interface Definition Language
  has been defined by CORBA for this.
• CORBA uses the Server-Client model, in which an
  object can be server, client or both.
• Supports static binding dinamic binding
• Does not knows the implementation details of the
  object (in order to be language-No conoce los
  detalles de las implementaciones fundamentales de
  los objetos. Un object adapter mapea modelos
  genéricos a implementaciones, siendo la principal
  manera en que las implementaciones de los objetos
  acceden los servicios provistos por el ORB
  (object Request Broker)

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How does it works ?

• CORBAs conceptual diagram

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How does it works ?

• The components diagram

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Evolution problems

• CORBA is a specification only, and there were
  some areas allowing individual vendors to
  interpret it in different ways.
• Trough the Internet Inter-ORB Protocol (IIOP),
  the OMG hopes the ORBs of diferentes vendors
  can communicate between them.
• The Portable Object Adapter (POA)
  specification permites clients adscribed to a
  particular ORB access the products of other
  vendors

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Compared with other products
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An example

• Sum(int i) set the numbers value
• Increment() increments it

A server for a number
Client for a number
Objects repository
The network and the ORB
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An example
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An example