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首页Overview of the OMG Data Distribution Service
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Tutorial on DDS Douglas C. Schmidt
2
Past R&D Successes: Platform-centric Systems
Legacy DoD systems are designed to be:
•
Stovepiped
•
Proprietary
•
Brittle & non-adaptive
•
Expensive to develop & evolve
•
Vulnerable
From this design paradigm…
Air
Frame
AP
Nav
WTS
GPS
IFF
FLIR
Cyclic
Exec
Problem: Small changes can break nearly anything & everything
Tutorial on DDS Douglas C. Schmidt
3
…and this operation paradigm…
Real-time QoS requirements for
platform-centric DoD systems:
•
Ensure end-to-end QoS, e.g.,
•
Minimize latency, jitter, & footprint
•
Bound priority inversions
•
Allocate & manage resources
statically
Utility
Resources
Utility “Curve”
“Broken”
“Works”
“Harder” Requirements
Problem: Lack of any resource can break nearly anything & everything
Past R&D Successes: Platform-centric Systems
Tutorial on DDS Douglas C. Schmidt
4
…to this design paradigm…
Past R&D Successes: Network-centric Systems
Event
Channel
Replication
Service
GPS IFF FLIR
Object Request Broker
Air
Frame
AP Nav WTS
Today’s leading-edge DoD systems are
designed to be:
•
Layered & componentized
•
More standard & COTS
•
Robust to expected failures & adaptive
for non-critical tasks
•
Expensive to evolve & retarget
•
Vulnerable
Problem: Unanticipated changes can break many things
Tutorial on DDS Douglas C. Schmidt
5
…and this operational paradigm…
Past R&D Successes: Network-centric Systems
Endsystem
Applications
Applications
Endsystem
Middleware
Middleware
Middleware
Middleware
Applications
Applications
Mechanism & Property
Managers
Sys Cond Sys Cond Sys Cond
Interceptor Interceptor
Local
Resource
Managers
Sys Cond
{
}
QoS Contracts QoS Contracts
Network latency
& bandwidth
Workload &
Replicas
CPU & memory
Connections &
priority bands
Network latency
& bandwidth
Workload &
Replicas
CPU & memory
Connections &
priority bands
Local
Resource
Managers
Adaptive Real-time Middleware
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