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hello-scafi's Introduction

Hello ScaFi

ScaFi is a toolkit for aggregate programming.

This project shows a basic ScaFi setup.

At a minimum, you usually need scafi-core, which includes an aggregate programming domaing-specific language (DSL) and interpreter.

Take a look at the following

  • build.sbt shows how to load ScaFi packages
  • src/main/scala/examples/HelloScafi.scala shows how to use ScaFi in a standalone way

Run with: sbt run

You should see the following output, corresponding to a synchronous execution of 5 rounds on 5 devices disposed on a linear network 1 -- 2 -- 3 -- 4 -- 5, with rounds scheduled using a round-robin scheduling:

RUN: DEVICE 1
        CONTEXT: DeviceState(1,Map(),Map(source -> false),Map(nbrRange -> Map(1 -> 0.0, 2 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 2
        CONTEXT: DeviceState(2,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> true),Map(nbrRange -> Map(1 -> 1.0, 2 -> 0.0, 3 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: 0.0
--------------
RUN: DEVICE 3
        CONTEXT: DeviceState(3,Map(2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(2 -> 1.0, 3 -> 0.0, 4 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 4
        CONTEXT: DeviceState(4,Map(3 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(3 -> 1.0, 4 -> 0.0, 5 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 5
        CONTEXT: DeviceState(5,Map(4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(4 -> 1.0, 5 -> 0.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 1
        CONTEXT: DeviceState(1,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(1 -> 0.0, 2 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 2
        CONTEXT: DeviceState(2,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 3 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> true),Map(nbrRange -> Map(1 -> 1.0, 2 -> 0.0, 3 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)
        OUTPUT: 0.0
--------------
RUN: DEVICE 3
        CONTEXT: DeviceState(3,Map(2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(2 -> 1.0, 3 -> 0.0, 4 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: 1.0
--------------
RUN: DEVICE 4
        CONTEXT: DeviceState(4,Map(3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(3 -> 1.0, 4 -> 0.0, 5 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 5
        CONTEXT: DeviceState(5,Map(4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(4 -> 1.0, 5 -> 0.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 1
        CONTEXT: DeviceState(1,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)),Map(source -> false),Map(nbrRange -> Map(1 -> 0.0, 2 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: 1.0
--------------
RUN: DEVICE 2
        CONTEXT: DeviceState(2,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> true),Map(nbrRange -> Map(1 -> 1.0, 2 -> 0.0, 3 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)
        OUTPUT: 0.0
--------------
RUN: DEVICE 3
        CONTEXT: DeviceState(3,Map(2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(2 -> 1.0, 3 -> 0.0, 4 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)
        OUTPUT: 1.0
--------------
RUN: DEVICE 4
        CONTEXT: DeviceState(4,Map(3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 4 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(3 -> 1.0, 4 -> 0.0, 5 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: 2.0
--------------
RUN: DEVICE 5
        CONTEXT: DeviceState(5,Map(4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(4 -> 1.0, 5 -> 0.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: Infinity
--------------
RUN: DEVICE 1
        CONTEXT: DeviceState(1,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)),Map(source -> false),Map(nbrRange -> Map(1 -> 0.0, 2 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)
        OUTPUT: 1.0
--------------
RUN: DEVICE 2
        CONTEXT: DeviceState(2,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 2 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)),Map(source -> true),Map(nbrRange -> Map(1 -> 1.0, 2 -> 0.0, 3 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)
        OUTPUT: 0.0
--------------
RUN: DEVICE 3
        CONTEXT: DeviceState(3,Map(2 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(2 -> 1.0, 3 -> 0.0, 4 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)
        OUTPUT: 1.0
--------------
RUN: DEVICE 4
        CONTEXT: DeviceState(4,Map(3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(3 -> 1.0, 4 -> 0.0, 5 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0)
        OUTPUT: 2.0
--------------
RUN: DEVICE 5
        CONTEXT: DeviceState(5,Map(4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0), 5 -> Map(P:/Rep(0)/FoldHood(0) -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> Infinity, P:/ -> Infinity, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(4 -> 1.0, 5 -> 0.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> 3.0, P:/ -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)
        OUTPUT: 3.0
--------------
RUN: DEVICE 1
        CONTEXT: DeviceState(1,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 2 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)),Map(source -> false),Map(nbrRange -> Map(1 -> 0.0, 2 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)
        OUTPUT: 1.0
--------------
RUN: DEVICE 2
        CONTEXT: DeviceState(2,Map(1 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 1, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 2 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)),Map(source -> true),Map(nbrRange -> Map(1 -> 1.0, 2 -> 0.0, 3 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0)
        OUTPUT: 0.0
--------------
RUN: DEVICE 3
        CONTEXT: DeviceState(3,Map(2 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 2, P:/Rep(0) -> 0.0, P:/ -> 0.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 0.0), 3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0)),Map(source -> false),Map(nbrRange -> Map(2 -> 1.0, 3 -> 0.0, 4 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0)
        OUTPUT: 1.0
--------------
RUN: DEVICE 4
        CONTEXT: DeviceState(4,Map(3 -> Map(P:/Rep(0)/FoldHood(0) -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 3, P:/Rep(0) -> 1.0, P:/ -> 1.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 1.0), 4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0), 5 -> Map(P:/Rep(0)/FoldHood(0) -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> 3.0, P:/ -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(3 -> 1.0, 4 -> 0.0, 5 -> 1.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0)
        OUTPUT: 2.0
--------------
RUN: DEVICE 5
        CONTEXT: DeviceState(5,Map(4 -> Map(P:/Rep(0)/FoldHood(0) -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 4, P:/Rep(0) -> 2.0, P:/ -> 2.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 2.0), 5 -> Map(P:/Rep(0)/FoldHood(0) -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> 3.0, P:/ -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> Infinity)),Map(source -> false),Map(nbrRange -> Map(4 -> 1.0, 5 -> 0.0)))
        EXPORT: Map(P:/Rep(0)/FoldHood(0) -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(0) -> 5, P:/Rep(0) -> 3.0, P:/ -> 3.0, P:/Rep(0)/FoldHood(0)/Nbr(1) -> 3.0)
        OUTPUT: 3.0
--------------

This example shows a gradient computation, self-stabilising to the field of minimum distances from source devices (here, device with ID=2). In this case of a hop gradient computation, distances are measured in terms of hops. Then, we see that device 2 yields 0.0 (since it is the source), devices 1 and 3 eventually yield 1.0 (they are at a distance of 1 hop from device 2), device 4 eventually yields 2.0 (it is at a distance of 2 hops from device 2), and device 5 eventually yields 3.0 (it is at a distance of 3 hops from device 3). The nice thing about this algorithm and approach is that changes (e.g. switch of sources, changes in topology etc.) would be absorbed by playing additional rounds: the idea, indeed, is that in each round the devices perceive and act upon their local context, and communicate with neighbours to progressively steer the collective behaviour.

See the ScaFi Website and Documentation for an introduction and more information about the paradigm.

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