scafi (scala fields)

scafi is a Scala-based library and framework for Aggregate Programming. It implements a variant of the Higher-Order Field Calculus (HOFC) operational semantics, which is made available as a usable domain-specific language (DSL), and provides a platform and API for simulating and executing Aggregate Computing systems and applications.

Please refer to the scafi main website for further information.


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Development branch

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Notes for developers



  • Add the dependency to scafi in your project (e.g., via sbt)
val scafi_core  = "it.unibo.apice.scafiteam" %% "scafi-core"  % "0.2.0"
val scafi_simulator  = "it.unibo.apice.scafiteam" %% "scafi-simulator"  % "0.2.0"
val scafi_simulator_gui  = "it.unibo.apice.scafiteam" %% "scafi-simulator-gui"  % "0.2.0"
val scafi_platform = "it.unibo.apice.scafiteam" %% "scafi-distributed"  % "0.2.0"

libraryDependencies ++= Seq(scafi_core, scafi_simulator, scafi_platform)
  • Use the API (e.g., to set up a simple simulation)
package experiments

import it.unibo.scafi.incarnations.BasicSimulationIncarnation.AggregateProgram

object MyAggregateProgram extends AggregateProgram {
  override def main() = gradient(isSource)

  def gradient(source: Boolean): Double =
    rep(Double.PositiveInfinity){ distance => 
      mux(source) { 0.0 } {

  def isSource = sense[Boolean]("source")
  def nbrRange = nbrvar[Double](NBR_RANGE_NAME)

import it.unibo.scafi.simulation.gui.{Launcher, Settings}

object SimulationRunner extends Launcher {
  Settings.Sim_ProgramClass = "experiments.MyAggregateProgram")
  Settings.ShowConfigPanel = true

Release notes

0.2.0 (2017-06-28)

  • several important adjustments to the core operational semantics (and more tests)
  • refactoring of the field calculus interpreter
  • a basic graphical simulator has been added as a separate module simulator-gui
  • cross compilation for Scala 2.11 and 2.12


  • Towards Aggregate Programming in Scala. Roberto Casadei and Mirko Viroli. In First Workshop on Programming Models and Languages for Distributed Computing (PMLDC), 2016.
  • Aggregate Programming for the Internet of Things. Jacob Beal, Danilo Pianini, and Mirko Viroli. IEEE Computer, 2015


  • roby [dot] casadei [at] unibo [dot] it
  • mirko [dot] viroli [at] unibo [dot] it


scafi is Open Source and available under the Apache 2 License.