CORBA (Common Object Request Broker Architechture)

CORBA (Common Object Request Broker Architechture)

CORBA (Common Object Request Broker Architechture) Aniket Prabhune Varun Saini Balaprasuna Chennupati Lally Singh CORBA Day1: Aniket : Introduction, OMA, ORB Core, OMG IDL, IDL Stubs and Skeletons Varun : Interface Repository, Dynamic Invocation and Dispatch (DII, DSI) Day2: Prasuna : Object Adapters, Inter-ORB

protocols (IIOP/GIOP), Services (Event, Naming, Trading, Transaction) Lally: COM vs CORBA, QoS, Examples and Applications CORBA Heterogeneous and Open Systems Engineering tradeoffs Cost Effectiveness Legacy Systems Need for integrating diverse applications within Distributed heterogeneous environments [SV97]

OMG (Object Management Group) Formed in 1989 to develop, adopt and promote standards for the development and deployment of applications in distributed heterogeneous environments. Largest software consortium in world with 800 + developers, vendors and end users on member list CORBA Industry Standard for open distributed processing [SV97] OMA (Object Management Architecture)

Object Model and Reference Model Object Model Defines how objects distributed across a heterogeneous environment can be described Object is an encapsulated entity with a distinct immutable identity whose services can be accessed only through well defined interfaces Object References [SV97] OMA Reference Model Characterizes the interactions between the objects Interface Categories in Domain OMA Reference Model Applicati on

Interface s Interface s Object Request Broker Object Services [ACP99] OMA Object Frameworks AI OS DI DI AI ORB AI

DI OS OS AI = Application Interface OS = Object Service DI = Domain Interface ORB = Object Request Broker [ACP99] Features of CORBA:

ORB Core OMG Interface Definition Language Language Mappings Stubs and Skeletons Interface Repository Dynamic Invocation and Dispatch Object Adapters Inter-ORB protocols Services [SV97] Relation between features: Client Application Static Stub DII ORB

Interface Client ORB Core IDL Dependant Server Application n/w ORB Interfac e Sktn DS I O A Server ORB Core Same for all applications Multiple OAs

[ACP99] ORB Core Deliver request to target object Return response to the clients Transparent Client/Object Communication Object Location Object implementation Object Execution State Object communication mechanism [SV97] IDL (Interface Definition Language)

Interfaces are defined in the OMG IDL Language-Independent declarative language eg: // OMG IDL interface Factory { Object create(); }; [SV97] IDL Includes

Built-in Types: long, short, float, double, char, boolean, octet, enum, etc Constructed Types: struct, union Template Types: string, sequence, fixed point decimal Interface Inheritance: Open-Closed Principle Object Interface [SV97] Language Mappings Determines how the OMG IDL features are mapped to the facilities of a given programming language OMG IDL Type C++ Mapping e.g.: long, short long, short float,double

float,double boolean bool char char struct struct union class sequence class ....

.... [SV97] Stubs and Skeletons IDL interface Stub Compiler Stubs (Client Side) Side) Skeletons (Server Fixed for a given language and interface Hide the ORB from application programmer [NE95] Marshalling & Unmarshalling eg: Acct -> List();

client program language request buffer stub client ORB marshalling n/w target object skeleton operation invocation

buffer unmarshallin g server ORB [SV97] Design Patterns (Stubs and Skeletons) Connect programming Language world to the underlying ORB transparently Stub adapts function call style of its language

mapping to the request invocation mechanism of the ORB Skeleton adapts request dispatching mechanism of the ORB to the upcall method form expected by the object implementation Form of Adapter and Proxy patterns Proxy: Provide a surrogate or placeholder for another object to control access to it Adapter: Convert the interface of class to another interface clients expect [SV97] [DP95] References: [SV97] Vinoski, S., CORBA: Integrating Diverse

Applications Within Distributed Heterogeneous Environments IEEE Communications Magazine, Vol. 35, No. 2, February 1997 [NE95] Edwards, N., CORBA: An Industrial Approach to Open Distributed Computing [ACP99] Henning, M., Vinoski, S., Advanced CORBA Programming with C++, Addison Wesley, 1999. [DP95] Gamma Erich., Helm Richard, Johnson Ralph, Vlissides, John, Design Patterns: Elements of Reusable Object-Oriented Software,Addison Wesley, 1995.

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