Survey of Distributed Objects Middleware JINI CORBA and

Survey of Distributed Objects Middleware JINI, CORBA and HLA. Simon El-Khoury University of Montreal, Department of Computer science Course : IFT 6275 Telematic Professor : Kropf Peter 10/7/2020 1

Overview n n n Middleware JINI CORBA HLA Comparison and Criticisms Conclusion 10/7/2020 2

Middleware 10/7/2020 3

Jini Context 10/7/2020 4

Key Concepts n Services n Lookup Services n Leasing n Transaction n Events 10/7/2020 5

Services n n n Services may be added or withdrawn from a Jini federation at any time. Jini provides mechanisms for service registration, lookup, and use. Services communicate by using a service protocol=set of Java interfaces. 10/7/2020 6

Lookup Services n n Repository of available services Service objects may be downloaded to a client as required May be federate with other lookup services Lookup service interface provides : n 10/7/2020 Registration, Access, Search, Removal 7

Discovery and Lookup Protocols n Allow a Jini service (hardware or software) to : n Find and join a group of Jini services n Advertise capabilities/services n Provide required software and attributes 10/7/2020 8

Discovery Protocol 10/7/2020 9

Join Protocol 10/7/2020 10

Lookup Protocol 10/7/2020 11

Client Uses Service 10/7/2020 12

Overview of CORBA 10/7/2020 13

What is CORBA ? n n n CORBA provides a software infrastructure of communication for the distributed applications. Standard CORBA offers a total solution to treat the heterogeneity of the distributed applications. The services objects and the common utilities of CORBA provide a vast range of software components to build distributed applications. 10/7/2020 14

CORBA ORB Architecture 10/7/2020 15

The IDL Language 10/7/2020 16

Interface Example 10/7/2020 17

High Level Architecture (HLA) Functional View of the HLA 10/7/2020 18

Definition of HLA n HLA Interface Specification n HLA Object Model Template (OMT) n HLA Rules 10/7/2020 19

Run Time Infrastructure (RTI) n n n Federation management Declaration management Object management Ownership management Time management Data distribution management 10/7/2020 20

Comparison and Criticisms n Jini n Java environment n Standard n n dynamic services A simple programming model 10/7/2020 n CORBA n n n Free Programming langage choice no fully standardisation Complicated programming model 21

Comparison and Criticisms n HLA n n Common Properties Simulation real Time n HLA need to pass a whole data in a near time n Integrate HLA with CORBA n Provide Objects Repository Subscription/Publication Model Choosing, monitoring and maintaining the interaction sessions 10/7/2020 22

Conclusion n Interoperability n Spontaneous Network n Transparent Communication n Share and Manage Resources 10/7/2020 23

References n Jini : n n http: //www. jini. org n n n http: //www. sun. com/jini Core Jini, by Keith Edwards, Prentice-Hall, 1999. n CORBA : http: //www. corba. com Inside CORBA, William A. Ruh and Thomas J. Mowbray, Addison-Wesley, 1997. n HLA : n Middle. Ware : n DMSO High Level n http: //www. globecom. net/draft Architecture Homepage. URL http: //hla. dmso. mil 10/7/2020 24

THE END Presented by Simon El-Khoury 10/7/2020 25