AmbientTalk A scripting language for mobile phones Tom Van Cutsem - - PowerPoint PPT Presentation

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ambienttalk

AmbientTalk A scripting language for mobile phones Tom Van Cutsem - - PowerPoint PPT Presentation

Jan 21, 2023 443 likes •762 views

AmbientTalk A scripting language for mobile phones Tom Van Cutsem Software Languages Lab Brussels, Belgium Mobile Ad Hoc Networks 2 Networks of mobile devices that use wireless p2p communication Mobile Ad Hoc Networks 2 Networks of mobile

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Software Languages Lab Brussels, Belgium

AmbientTalk

Tom Van Cutsem

A scripting language for mobile phones

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SLIDE 2

Mobile Ad Hoc Networks

Networks of mobile devices that use wireless p2p communication

2

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SLIDE 3

Mobile Ad Hoc Networks

Networks of mobile devices that use wireless p2p communication

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Zero Infrastructure

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SLIDE 4

Mobile Ad Hoc Networks

Networks of mobile devices that use wireless p2p communication

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Volatile Connections Zero Infrastructure

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SLIDE 5

Mobile Ad Hoc Networks

Networks of mobile devices that use wireless p2p communication

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Volatile Connections Zero Infrastructure Local interactions

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SLIDE 6

Object-oriented, functional patterns,

dynamically typed

Actor-based concurrency/distribution
Mirror-based reflection
JVM as platform
Runs on and J2ME/CDC phones

AmbientTalk: fact sheet

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SLIDE 7

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

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Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 8

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 9

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 10

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 11

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 12

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 13

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 14

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 15

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 16

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 17

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 18

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 19

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76

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SLIDE 20

Scheme 1975

ABCL

Smalltalk ‘70s-‘80s

4

Four Decades of Language Research

AmbientTalk 2006 1986 1997 1986 Hewitt’s actors (PLASMA) ‘73-’76 ECMAScript Harmony

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How does AmbientTalk help?

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Volatile Connections Zero Infrastructure

No blocking synchronization receive events, even when disconnected Peer-to-peer service discovery protocol decentralized, location-based Asynchronous, buffered messaging send messages, even when disconnected Network failures ≠ exceptions timeouts & leasing, whether connected or disconnected

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Event Loop Concurrency

AmbientTalk programs are event loops
They react to events from the outside world
Inter-event loop communication is asynchronous

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Event Loop Concurrency

AmbientTalk programs are event loops
They react to events from the outside world
Inter-event loop communication is asynchronous

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Event Loop (actor) Message queue

bjects

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Demo

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def service := object: { def echo(text) { system.println("Received: "+text); text } } deftype EchoService; def pub := export: service as: EchoService; deftype EchoService; def echoF := when: EchoService discovered: { |echoSvc| system.println("Discovered an echo service"); echoSvc; } within: 2.minutes echoF<-echo("test1"); def resultF := echoF<-echo("test2")@TwoWay; when: resultF becomes: { |value| system.println("Reply: " + value); } echoF<-echo("test3");

EchoServer EchoClient

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AmbientTalk = OO + Events

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when: type discovered: { |ref| ... } when: future becomes: { |result| ... } when: ref disconnected: { ... } when: ref reconnected: { ... } when: ref expired: { ... }

Follow-up on

utstanding requests

React to services appearing and disappearing Generate and receive application requests React to references disconnecting, reconnecting, expiring

bj<-msg(arg)

def msg(param) { ... }

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Urbiflock

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P2P Geosocial networking

framework

Test deployment on Brussels

public transport network

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Summary

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Volatile Connections Zero Infrastructure ad hoc

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SLIDE 29

Summary

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Volatile Connections Zero Infrastructure Android 1.6 J2ME CDC J2SE 1.5 ad hoc

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Summary

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Volatile Connections Zero Infrastructure

Non-blocking Synchronisation Decentralized Discovery Asynchronous Communication Disconnections ≠ Failures

Android 1.6 J2ME CDC J2SE 1.5 ad hoc

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ambienttalk.googlecode.com

Interpreter (MIT License)