Stateless

A simple library for creating state machines in C# code.

Github (.NET) | Github (Java)

"Create state machines and lightweight state machine-based workflows directly in .NET code:

var phoneCall = new StateMachine<State, Trigger>(State.OffHook);

phoneCall.Configure(State.OffHook)
    .Permit(Trigger.CallDialled, State.Ringing);
	
phoneCall.Configure(State.Ringing)
    .Permit(Trigger.CallConnected, State.Connected);
 
phoneCall.Configure(State.Connected)
    .OnEntry(() => StartCallTimer())
    .OnExit(() => StopCallTimer())
    .Permit(Trigger.LeftMessage, State.OffHook)
    .Permit(Trigger.PlacedOnHold, State.OnHold);

// ...

phoneCall.Fire(Trigger.CallDialled);
Assert.AreEqual(State.Ringing, phoneCall.State);

"Create state machines and lightweight state machine-based workflows directly in Java code:"

StateMachineConfig<State, Trigger> phoneCallConfig = new StateMachineConfig<>();

phoneCallConfig.configure(State.OffHook)
        .permit(Trigger.CallDialed, State.Ringing);

phoneCallConfig.configure(State.Ringing)
        .permit(Trigger.HungUp, State.OffHook)
        .permit(Trigger.CallConnected, State.Connected);

// this example uses Java 8 method references
// a Java 7 example is provided in /examples
phoneCallConfig.configure(State.Connected)
        .onEntry(this::startCallTimer)
        .onExit(this::stopCallTimer)
        .permit(Trigger.LeftMessage, State.OffHook)
        .permit(Trigger.HungUp, State.OffHook)
        .permit(Trigger.PlacedOnHold, State.OnHold);

// ...

StateMachine<State, Trigger> phoneCall =
        new StateMachine<>(State.OffHook, phoneCallConfig);

phoneCall.fire(Trigger.CallDialed);
assertEquals(State.Ringing, phoneCall.getState());

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Tags: clr   library   state machine  

Last modified 22 January 2025