distributed reactive programming tools2010
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Loosely-coupled Distributed Reactive Programming in Mobile Ad Hoc Networks
Andoni Lombide Carreton, Stijn Mostinckx, Tom Van Cutsem and Wolfgang De Meuter
Department of Computer ScienceVrije Universiteit Brussel
48th International Conference on Objects, Models, Components, Patterns -- TOOLS 2010June 28 - July 2 2010Malàga, Spain
Tuesday 29 June 2010
The mobile ticket trader application
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Intermittent connectivity
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Intermittent connectivity
Spontaneous interactions
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Intermittent connectivity
Scarce infrastructure
Spontaneous interactions
Tuesday 29 June 2010
Pervasive Computing and Mobile Ad Hoc Networks
Mobile devices
Intermittent connectivity
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Ad Hoc Discovery
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Decentralized
Ad Hoc Discovery
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Decentralized
Resilient
Ad Hoc Discovery
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Event streams
Decentralized
Resilient
Ad Hoc Discovery
Tuesday 29 June 2010
Distributed Event-driven Architecture
Pervasive Computing and Mobile Ad Hoc Networks
Scarce infrastructure
Representation of physical objects
Spontaneous interactions
Intermittent connectivity
Mobile devices
Event streams
Decentralized
Resilient
Ad Hoc Discovery Broadcasting
Tuesday 29 June 2010
Distributed Event-driven Architecture
• Spontaneous discovery of nearby peers and their ticket offers
• Disconnection/reconnection
• Location of interesting peers changed
• Own location changed
• Price of interesting ticket offers changed
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
“do m immediately”
obj
obj.m()
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
“do m eventually”
obj<-m()
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
“do m eventually”
obj<-m()
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
?
future
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
?
future
when: future becomes: { |value| // process reply}
Tuesday 29 June 2010
Event Loop Concurrency in AmbientTalk
?
future
when: future becomes: { |value| // process reply}
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
deftype TicketVendor deftype TicketVendor
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
export: ticketVendor as: TicketVendordeftype TicketVendor deftype TicketVendor
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
export: ticketVendor as: TicketVendorwhenever: TicketVendor discovered: { |ticketVendor| // React on ticketVendor appearance when: ticketVendor disconnected: { // React on disappearance } when: ticketVendor reconnected: { // React on reappearance }}
deftype TicketVendor deftype TicketVendor
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
export: ticketVendor as: TicketVendorwhenever: TicketVendor discovered: { |ticketVendor| // React on ticketVendor appearance when: ticketVendor disconnected: { // React on disappearance } when: ticketVendor reconnected: { // React on reappearance }}
deftype TicketVendor deftype TicketVendor
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
export: ticketVendor as: TicketVendorwhenever: TicketVendor discovered: { |ticketVendor| // React on ticketVendor appearance when: ticketVendor disconnected: { // React on disappearance } when: ticketVendor reconnected: { // React on reappearance }}
deftype TicketVendor deftype TicketVendor
Ad Hoc Discovery
Tuesday 29 June 2010
Publishing & discovering objects by topic
ticketVendor
export: ticketVendor as: TicketVendorwhenever: TicketVendor discovered: { |ticketVendor| // React on ticketVendor appearance when: ticketVendor disconnected: { // React on disappearance } when: ticketVendor reconnected: { // React on reappearance }}
deftype TicketVendor deftype TicketVendor
Ad Hoc Discovery
Decentralized
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
getLocation
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
getLocation
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
getLocation
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Tuesday 29 June 2010
Asynchronous communication
ticketVendor
when: TicketVendor discovered: { |ticketVendor| when: ticketVendor<-getLocation()@Due(timeout) becomes: { |loc| // Update user interface with the location } catch: TimeoutException using: { |e| // Remove ticket offer from user interface }}
Resilient
Tuesday 29 June 2010
Ambient References
def werchterVendors := ambient: TicketVendor where: { |tv| tv.event == “Rock Werchter”};
whenAll: werchterVendors<-getLocation()@Expires(5.seconds) becomes: { |locations| // Update the map GUI with the locations }
werchterVendors
Broadcasting
Tuesday 29 June 2010
Ambient References
def werchterVendors := ambient: TicketVendor where: { |tv| tv.event == “Rock Werchter”};
whenAll: werchterVendors<-getLocation()@Expires(5.seconds) becomes: { |locations| // Update the map GUI with the locations }
werchterVendors
Broadcasting
Tuesday 29 June 2010
AmbientTalk/R
gui.centerOn(GPS_Location.latitude, GPS_Location.longitude);
GPS_Location
latitude longitude
_.latitude _.longitude
gui.centerOn(_, _)
GPS_Location
Tuesday 29 June 2010
AmbientTalk/R
gui.centerOn(GPS_Location.latitude, GPS_Location.longitude);
GPS_Location
latitude longitude
_.latitude _.longitude
gui.centerOn(_, _)
_.latitude _.longitude
latitude longitude
Tuesday 29 June 2010
AmbientTalk/R
gui.centerOn(GPS_Location.latitude, GPS_Location.longitude);
GPS_Location
latitude longitude
_.latitude _.longitude
gui.centerOn(_, _)gui.centerOn(_, _)
Tuesday 29 June 2010
AmbientTalk/R
def Coordinate := isolate: { def latitude := 0; def longitude := 0;
def distanceTo(anotherCoordinate) { // Compute via Haversine formula };
def @Mutator update(newLatitude, newLongitude) { latitude := newLatitude; longitude := newLongitude; };};
def GPS_Location := makeReactive(Coordinate.new());
GPS.addLocationObserver: { |lat, lon| GPS_Location.update(lat, lon)};
GPS_Location
Tuesday 29 June 2010
AmbientTalk/R
def Coordinate := isolate: { def latitude := 0; def longitude := 0;
def distanceTo(anotherCoordinate) { // Compute via Haversine formula };
def @Mutator update(newLatitude, newLongitude) { latitude := newLatitude; longitude := newLongitude; };};
def GPS_Location := makeReactive(Coordinate.new());
GPS.addLocationObserver: { |lat, lon| GPS_Location.update(lat, lon)};
GPS_Location
Event streams
Tuesday 29 June 2010
vendorLocation
vendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocation
vendorLocation
TicketVendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocation
vendorLocation
TicketVendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocation
vendorLocation
TicketVendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocation
vendorLocation
vendorLocation
TicketVendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocation
vendorLocation
vendorLocation
TicketVendorLocation
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @Any vendorLocation := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” };
GUI.showLocationOnM
GPS_Location
_.latitude _.longitude
latitude longitude
gui.centerOn(_, _)
Tuesday 29 June 2010
vendorLocations
vendorLocations
vendorLocations
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @All vendorLocations := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” } timeout: 2000;
GPS_Location
GPS_Location
Tuesday 29 June 2010
vendorLocations
vendorLocations
vendorLocations
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @All vendorLocations := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” } timeout: 2000;
GPS_Location
GPS_Location
GPS_Location
Tuesday 29 June 2010
vendorLocations
vendorLocations
vendorLocations
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @All vendorLocations := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” } timeout: 2000;
GPS_Location
GPS_Location
GPS_Location
Tuesday 29 June 2010
vendorLocations
vendorLocations
vendorLocations
Ambient Behaviors
exportBehavior: GPS_Location as: TicketVendorLocation to: { |buyer| buyer.interestedIn == “Rock Werchter” };
def @All vendorLocations := ambientBehavior: TicketVendorLocation where: { def interestedIn := “Rock Werchter” } timeout: 2000;
GPS_Location
GPS_Location
Tuesday 29 June 2010
Ambient Behaviors
def findOffers(event, maxPrice, maxDistance) { // Subscribe to ticket offers def @All allNearbyOffers := ambientBehavior: TicketOfferT timeout: 2000;
// Filter out interesting ticket offers allNearbyOffers.filter: { |offer| (offer.eventName == event).and: { (offer.price <= maxPrice).and: { GPS_Location.distanceTo(offer.location) <= maxDistance }}};};
• Disconnection/reconnection
• Location of interesting peers changed
• Own location changed
• Price of interesting ticket offers changed
def werchterVendors := findOffers(“Rock Werchter”, 120, 500);
gui.updateWithOffers(werchterVendors);
Tuesday 29 June 2010
Reactive Queries
def werchterVendors := ambient: TicketVendor where: { |tv| tv.event == “Rock Werchter”};
def locations := werchterVendors<-getLocation()@Refresh(2.seconds);
locations.each: { |coordinates| GUI.showLocationOnMap(coordinates) };
werchterVendors
Tuesday 29 June 2010
Reactive Queries
def werchterVendors := ambient: TicketVendor where: { |tv| tv.event == “Rock Werchter”};
def locations := werchterVendors<-getLocation()@Refresh(2.seconds);
locations.each: { |coordinates| GUI.showLocationOnMap(coordinates) };
werchterVendors
Tuesday 29 June 2010
Limitations and Future Work
• AmbientTalk/R yields a higher computational overhead than plain AmbientTalk.
• Event message order preservation not guaranteed on very fine-grained levels over different communication partners.
• No real-time guarantees.
• Event consumers can only create and cancel their distributed dependencies: they cannot limit the number of propagated events.
Tuesday 29 June 2010
Conclusion
• Decentralized publish/subscribe architecture based on UDP broadcasting allows spontaneous and loosely-coupled group interactions.
• Reactive interpreter allows reacting to and processing of events without relying on “callback-spaghetti”.
• Ambient behaviors and reactive queries reconcile both programming styles.
• Event propagation happens with asynchronous messages among distributed event loops: no concurrency issues and resilient to intermittent network connectivity.
http://soft.vub.ac.be/soft/research/amopcopTuesday 29 June 2010
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