https://github.com/danpersa/edge-state-machine-scala

https://github.com/danpersa/edge-state-machine-scala

Last synced: 2 months ago
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• Host: GitHub
• URL: https://github.com/danpersa/edge-state-machine-scala
• Owner: danpersa
• Created: 2013-10-24T12:35:02.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-11-01T09:25:44.000Z (over 11 years ago)
• Last Synced: 2025-01-22T04:31:21.776Z (4 months ago)
• Language: Scala
• Size: 117 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rdoc

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README

        
= Edge State Machine

== State Machine Examples

=== User State Machine

==== Define

  class User(var state: State = State("pending")) extends AbstractStateMachine {

    state("pending")

    state("active")

    state("blocked")

    event("activate")  {

      transition(_, from = Set("pending", "blocked"), to = "active", doActivate)

    }

    event("block") {

      transition(_, from = Set("active"), to = "blocked", doBlock)

    }

    def doBlock = println("do_block")

    def doActivate = println("do_activate")

  }

  

==== Use

  val user = new User()

  // user.state must beEqualTo(State("pending"))

  user activate()

  // user.state must beEqualTo(State("active"))

  user block()

  // user.state must beEqualTo(State("blocked"))

  user activate()

  // user.state must beEqualTo(State("active"))

=== Dice State Machine

==== Define

  object DiceStates {

    val states: List[String] = List("one", "two", "three", "four", "five", "six")

    val statesSet: Set[String] = states.to[Set]

  }

  class Dice(var state: State = State("one")) extends AbstractStateMachine {

    state("one")

    state("two")

    state("three")

    state("four")

    state("five")

    state("six")

    event("roll") {

      transition(_, from = DiceStates.statesSet,

        to = DiceStates.statesSet,

        guard = rollResult,

        onTransition = displayDiceRollingAnimation)

    }

    def rollResult = { State(DiceStates.states(Random.nextInt(6))) }

    def displayDiceRollingAnimation = println(print(s"--------------- DICE: throw: $state ------------"))

  }

  

==== Use

  val dice = new Dice()

  dice.roll()

  // dice.state.name must(beOneOf("one", "two", "three", "four", "five", "six"))