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Example code of sofa/state-machine

Informations about the package state-machine

Sofa/StateMachine

Finite State Machine implementation

Downloads stable Coverage Status

Installation

Add package to your project:

Usage

State machine helps you eliminate switch and/or if/else statements in your code to determine available actions in given state.

Let's use a naive example from a Laravel's Blade view template and underlying Eloquent Order model:

This quickly gets out of hand, especially when a new status is introduced or the processing order changes.

To streamline it, we can implement state machine for the Order entity:

  1. implement interface on the Order model

  2. define available transitions and prepare data for the template:

  3. and we end up with controller & template code decoupled from the Process logic & order:

  4. finally let's process the actions

With this setup we no longer have to change our controllers or views, whenever business requirements change. Instead we add a new transition to the state machine definition.

I need more control during transition - how to?

The above example assumes very simple transition process, ie. $order->status = $new_status. This can be enough sometimes, but often we will need more flexibility during transitions. To address this need you can customize your Transition definitions, so they turn from simple POPO into callable that will be invoked, when state machine processes appropriate action:

Happy Coding!

Contribution

All contributions are welcome. Make your PR PSR-2 compliant and tested.

All versions of state-machine with dependencies

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Package Version
Requires php Version >=7.1.0
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