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Generic QoSSupport for CORBA
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Non generic, single category QoS-integration predominates in oo-middleware ... ORB Bypasses: Streams - Group Configuration - Service-Adaptation. Network Layer QoS ... – PowerPoint PPT presentation
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Title: Generic QoSSupport for CORBA
1
Generic QoS-Support for CORBA
Johann Wolfgang Goethe-Universität Frankfurt am
Main
- Christian Becker Kurt Geihs
- Computer Science Dep.
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Outline
- Quality of Service (QoS)
- QoS-Management
- QoS-Specification
- QoS-Mechanism Integration
- Conclusion and Outlook
3
Quality of Service (QoS)
- More than Bandwidth...
- realtime, fault-tolerance, availability
- Crucial for distributed applications
- Object-oriented middleware is popular
- Non generic, single category QoS-integration
predominates in oo-middleware
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QoS-Management
- QoS-Integration in oo-middleware should be
- Multi-Category not bound to a distinct
QoS-category, e.g. realtime or fault-tolerance - Generic definition and implementation of new QoS
characteristics - Extensive integration of existing services
(trading) as well as new services (accounting,
monitoring)
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QoS and OO-Middleware
- QoS is an Aspect in the sense of AOP
- Hard to reuse
- Hard to separate
- AOP is a suitable guideline
- QoS-Implementor New role
- QoS-Specification Enhancing the services
contract - QoS-Implementation QoS is an E-2-E matter
- Weaving of QoS-Aspects with Application-Objects
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Management Architecture for QoS (MAQS)
- Simple to use
- Separation of Concern QoS-Implementor
- AOP-based approach Weaving QoS-aspects with
application objects - Extensive
- Generic, Multi-category
- Runtime-Support Negotiation, Trading, Accounting
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QoS-Specification
- Two Views on a QoS-Aspect
- Interface Enhanced IDL QIDL
- QoS-Parameter
- QoS-Interface (Mechanism, QoS/Application-Interfac
e) - QoS assignment to service
- Implementation Aspect Weaving (QIDL-Compiler)
- QoS-Implementation QoS-Implementor
- Service-Implementation Service-Implementor
- No additional Aspect-Languages needed
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QIDL
qos Avail double MTTF int servernum
interface void put_state(in any state)
double get_cur_avail() interface
better_naming naming withQoS Avail
- Small changes to OMG IDL (2 Keywords)
- Definition of a QoS
- Parameter
- Interface
- Assignment QoS-Service
- 2 Roles
- QoS-Implementor
- Service-Implementor
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QoS-Mechanism Integration
- Application Layer QoS
- Interceptors (which?)
- Architecture specific
- Network Layer QoS
- Pluggable Protocols
- Object Adapters
- Architecture specific
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Conclusion
- CORBA is a vantage point for QoS-integration
- AOP effort justifiable for generic QoS support
- ORB core will become (more and more) extendable
for QoS-mechanism integration - but
- An uniform specification/mapping is still missing
- Services have to be added and standardized
- http//www.vsb.cs.uni-frankfurt.de/maqs/
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