public void Guard_is_called_with_the_expected_parameters()
{
var machine = TinyStateMachine <DoorState, DoorEvents> .Create(DoorState.Closed)
.Tr(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.Guard((from, trigger, to) => {
Assert.That(from, Is.EqualTo(DoorState.Closed));
Assert.That(trigger, Is.EqualTo(DoorEvents.Open));
Assert.That(to, Is.EqualTo(DoorState.Open));
return(true);
})
.Tr(DoorState.Open, DoorEvents.Close, DoorState.Closed)
.Guard((from, trigger, to) => {
Assert.That(from, Is.EqualTo(DoorState.Open));
Assert.That(trigger, Is.EqualTo(DoorEvents.Close));
Assert.That(to, Is.EqualTo(DoorState.Closed));
return(true);
})
.Compile();
Parallel.ForEach(GetTokens(machine), storage => {
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
machine.Fire(DoorEvents.Open, storage);
Assert.That(storage.State, Is.EqualTo(DoorState.Open));
machine.Fire(DoorEvents.Close, storage);
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
});
}
public void Guard_can_stop_transition()
{
var machine = TinyStateMachine <DoorState, DoorEvents> .Create(DoorState.Closed)
.Tr(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.Guard(() => false)
.Tr(DoorState.Open, DoorEvents.Close, DoorState.Closed)
.Compile();
Parallel.ForEach(GetTokens(machine), storage => {
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
machine.Fire(DoorEvents.Open, storage);
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
});
}
public void Calling_Reset_method_does_not_call_guard_or_trigger_transitions()
{
var machine = TinyStateMachine <DoorState, DoorEvents> .Create(DoorState.Closed)
.Tr(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.On((t) => Assert.Fail())
.Guard((from, trigger, to) => false)
.Tr(DoorState.Open, DoorEvents.Close, DoorState.Closed)
.On((t) => Assert.Fail())
.Guard((from, trigger, to) => false)
.Compile();
Parallel.ForEach(GetTokens(machine), storage => {
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
machine.Reset(DoorState.Open, storage);
Assert.That(storage.State, Is.EqualTo(DoorState.Open));
machine.Reset(DoorState.Closed, storage);
Assert.That(storage.State, Is.EqualTo(DoorState.Closed));
});
}
public void Appropriate_action_is_called_on_transition()
{
var machine = TinyStateMachine <DoorState, DoorEvents> .Create <DoorMemory>(DoorState.Closed)
.Tr <bool>(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.On((t, value) => t.wasDoorOpened = value)
.Tr(DoorState.Open, DoorEvents.Close, DoorState.Closed)
.On((t) => t.wasDoorClosed = true)
.Compile();
var doorMemory = new DoorMemory[ParallelTestCount];
for (int i = 0; i < ParallelTestCount; i++)
{
doorMemory[i] = new DoorMemory(machine);
}
Parallel.ForEach(doorMemory, storage => {
Assert.That(storage.wasDoorOpened, Is.False);
Assert.That(storage.wasDoorClosed, Is.False);
Assert.Throws <InvalidOperationException>(() =>
machine.Fire(DoorEvents.Open, storage)
);
Assert.Throws <InvalidOperationException>(() =>
machine.Fire(DoorEvents.Open, storage, 14)
);
machine.Fire(DoorEvents.Open, storage, true);
Assert.That(storage.wasDoorOpened, Is.True);
Assert.That(storage.wasDoorClosed, Is.False);
machine.Fire(DoorEvents.Close, storage);
Assert.That(storage.wasDoorOpened, Is.True);
Assert.That(storage.wasDoorClosed, Is.True);
});
}
public void WorkTheDoor()
{
// Declare the FSM and specify the starting state.
var doorFsmCompiler = TinyStateMachine <DoorState, DoorEvents> .Create <Door>(DoorState.Closed);
// Now configure the state transition table.
doorFsmCompiler.Tr(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.Tr <bool>(DoorState.Open, DoorEvents.Close, DoorState.Closed)
.On((d, slammed) => d.WasSlammed = slammed);
var doorFsm = doorFsmCompiler.Compile();
var door = new Door()
{
Memory = doorFsm.CreateMemory()
};
// As specified in the constructor, the door starts closed.
Debug.Assert(door.Memory.IsInState(DoorState.Closed));
// Let's trigger a transition
doorFsm.Fire(DoorEvents.Open, door);
// Door is now open.
Debug.Assert(door.Memory.IsInState(DoorState.Open));
// create as many doors as needed
var otherDoor = new Door()
{
Memory = doorFsm.CreateMemory()
};
// The state machine is shared, but the state is not
Debug.Assert(otherDoor.Memory.IsInState(DoorState.Closed));
// According to the transition table, closing a door requires
// a bool argument. The following will throw an exception
bool exceptionWasThrown = false;
try {
// Let's trigger the other transition
doorFsm.Fire(DoorEvents.Close, door);
}
catch {
exceptionWasThrown = true;
}
Debug.Assert(exceptionWasThrown == true);
// Door is still open.
Debug.Assert(door.Memory.IsInState(DoorState.Open));
// Slam it this time
doorFsm.Fire(DoorEvents.Close, door, true);
// Door is now closed.
Debug.Assert(door.Memory.IsInState(DoorState.Closed));
// Door is was slammed.
Debug.Assert(door.WasSlammed);
// still closed
Debug.Assert(otherDoor.Memory.IsInState(DoorState.Closed));
// According to the transition table, a closed door
// cannot be closed. The following will throw an exception
exceptionWasThrown = false;
try {
doorFsm.Fire(DoorEvents.Close, door);
}
catch {
exceptionWasThrown = true;
}
Debug.Assert(exceptionWasThrown == true);
}
private static TinyStateMachine <DoorState, DoorEvents> .Machine <TMemory> .Compiler GetFixtureCompiler <TMemory>() where TMemory : TinyStateMachine <DoorState, DoorEvents> .IStorage
{
return(TinyStateMachine <DoorState, DoorEvents> .Create <TMemory>(DoorState.Closed)
.Tr(DoorState.Closed, DoorEvents.Open, DoorState.Open)
.Tr(DoorState.Open, DoorEvents.Close, DoorState.Closed).compiler);
}