Common Object Request Broker Architecture vs Competitors Cont'

1
Common Object Request Broker Architecture
vsCompetitors Cont.

• PRESENTED BY
• MEENU SUNDARAM
• August 16th 2002

2
CORBA vs HLA

• What is HLA?
• CORBA vs HLA
• Conclusion

3
What is HLA (High Level
Architecture)?

• Is a standard framework that supports simulations
  composed of different simulations.
• Developed by the Defense Modelling and Simulation
  Office of Department of Defense.
• A simulation which is implemented as part of an
  HLA-compliant simulation, it is referred as a
  federate.
• Consists of three components
• Federation Rules
• Interface Specification
• Object Model Template

4
What is HLA?

• Federation rules
• Ensure Proper Interaction of simulation in a
  federation
• Define the simulation and federate
  responsibilities
• Interface Specification
• Defines Run Time Infrastructure(RTI) services.
• Identifies callback functions each federation
  must provide
• Object Model Template
• Provides a common method for recording
  information
• Establishes the format of key models
• Federation Object Model (FOM)-introduces all
  shared information
• Simulation Object Model (SOM)-describes salient
  features of a federate.
• Management Object Model (MOM)-identifies objects
  and interactions used to manage a federation.

5
CORBA vs HLA

• CORBA is a framework for distributed
  applications.Where as in HLA is a framework for
  distributed simulations.
• CORBA guarantees interoperability.Where as in HLA
  the responsibility of interoperability depends on
  the languages specified in RTI.
• HLA is more robust infrastructure as compared to
  CORBA.
• CORBA provides specific protocols IIOP(Inter Orb
  Protocol.).Where as HLA leaves this decision to
  RTI.

6
Conclusion

• HLA would be the best choice for legacy
  simulations.
• CORBA would be the best choice in situations
  where legacy databases used for middleware
  creation.
• ( link http//www-ece2.engr.ucf.edu/ofa/repor
  t1.htm. )
• My Conclusion
• CORBA would be best for VLAB, we will not have to
  through the hassle of making one simulation
  compliant with another(federate)
• The interoperability in HLA depends on the
  language specifications in RTI.