Access transition parameters passed to apply() in TransitionInterface::process

[iainmckay]

Hi, we're integrating Finite in our project and we're implementing our transition logic as concrete implementations of TransitionInterface. Tracing through the source, we've found the the parameters passed to StateMachine::apply() aren't passed to TransitionInterface::process.

Is there a reason for this? Would a PR be accepted to change this?

[yohang]

Hi @iainmckay,

There is a single reason behind this : it implies modification on the TransitionInterface, which is a BC break...

I'll accept a PR for that with pleasure, but it implies a version bump to 2.0, which will not be tagged now as I have some new feature to include at the same time.

The current way to retrieve parameters at transition time is to implement listeners. Or to declare a method of your custom transition class as a transition callback.

[luads]

+1

I'm doing the same concrete implementation of transitions and being able to receive the parameters on the process method would be awesome.

As a fix, I created my own base Transition class that uses resolveProperties to store the values:

protected $propertyValues;

public function resolveProperties(array $properties)
{
    $this->propertyValues = parent::resolveProperties($properties);
    return $this->propertyValues;
}

public function getPropertyValue(string $property)
{
    return $this->propertyValues[$property] ?? null;
}

It depends on resolveProperties being called by the event, but at least I'm able to handle the values on the process method for now.