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EES.5413 February 16, 2005. Remi Bosman System Architecture & Networking Department of Mathematics & Computer Science Eindhoven University of Technology. Content. Introduction Applications in network Service orchestration Orchestration language Research questions Incompatibility - PowerPoint PPT Presentation
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16/02/06 Internet based monitoring and control of embedded systems
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EES.5413February 16, 2005
Remi Bosman
System Architecture & NetworkingDepartment of Mathematics & Computer Science
Eindhoven University of Technology
16/02/06 Internet based monitoring and control of embedded systems
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Content
• Introduction• Applications in network• Service orchestration• Orchestration language• Research questions• Incompatibility• Conflicts• Conclusion
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Introduction
• About me
• Running example scenario
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AmI environment example
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Home surveillance application
orchestratorbinds
binds
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Home surveillance application
orchestrator
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Home surveillance application
orchestrator
knows
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Home surveillance application
orchestratorbinds
bindsbinds
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Home surveillance application
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Home surveillance application
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Home surveillance application
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Home surveillance application
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Home surveillance application
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Applications in the network
Service
ControlPoint Application11
1
*
Orchestrator
Service
*
*
1
*Application
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Service orchestration
• Create, destroy and change applications– Binding services– Configuring services
• Application change– Service removal– Context change– Manager services
• Context examples– Time– Location– Environment conditions (light / noise level)
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Orchestration language
• Script for the orchestrator• Guarded events (rules) • Goals:
– Simple to use– Yet expressive
• Needs testing against scenarios
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Example 1: a camera vieweron this.LIFECYCLE(START):
source = find(CAMERA) sink = find(DISPLAY)
on this.SUBSCRIBED:if (source is not None) and (sink is not None):
sink.Open(sink.HostName, 49000)source.Open(sink.HostName, 49000)sink.Start()source.Start()
on this.UNSUBSCRIBED:if source is not None:
source.Close()
if sink is not None:sink.Close()
on this.LIFECYCLE(STOP):if sink is not None:
sink.Close()
if source is not None:source.Close()
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Example 2: doorbell cameraon this.LIFECYCLE(START):
source = find(CAMERA)sink = find(DISPLAY)trigger = find(DOORBELL)
on this.SUBSCRIBED:if (source is not None) and (sink is not None) and (trigger is not None):
sink.Open(sink.HostName, 49000)source.Open(sink.HostName, 49000)sink.start()source.subscribe(trigger.PressedEvent, "Start(60)")
on this.UNSUBSCRIBED:if source is not None:
source.unsubscribe(trigger)source.Close()
if sink is not None:sink.Close()
on this.LIFECYCLE(STOP):if source is not None:
source.unsubscribe(trigger)source.Close()
if sink is not None:sink.Close()
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Research questions
• What is the minimal interface required in services for generic composition?
• What is a "good" instruction set for / what constructs are needed in a service composition language?
• What solutions are there for interface/protocol incompatibility?
• How can orchestration conflicts be resolved?
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Incompatibility
• How to connect services which do not speak each others language– Orchestrator ‘teaches’ which messages to send– Introduce translation service
+Show()
Camera
+Display()
Television
+Show()+Display()
Translator
1 1 1 1
Orchestrator1
-connects1
-connects and1
-configures1
1
-connects1
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Conflicts
• Orchestrator A– Showing a movie
• Orchestrator B– Show short camera capture
Orchestrator A Orchestrator B
DVD Player CameraTelevision
1
1
1
1
1 1
1
1
1
1
1 1
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Conclusion
• Orchestration of services in the network• Rule / event language for orchestration• Service interface compatibility• Orchestration conflict resolving
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Questions?
