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Informations about the package state-machine

State Machine

This is a simple, no-deps PHP state machine.

Installation

Update your composer.json file adding the following dependency and run php composer.phar update carlescliment/state-machine:

    "carlescliment/state-machine": "0.0.4"

Usage

Implementing a state machine is straight-forward. You need four components; a statable object, states, transitions and the state machine.

<?php

use carlescliment\StateMachine\Model\Statable,
    carlescliment\StateMachine\Model\StateMachine,
    carlescliment\StateMachine\Model\Transition;

class SemaphoreStates
{
    const OPEN = 'semaphore.open';
    const WARNING = 'semaphore.warning';
    const LOCKED = 'semaphore.locked';

    public static function all()
    {
        return array(self::OPEN, self::WARNING, self::LOCKED);
    }
}

class SemaphoreTransitions
{
    const GIVE_PASS = 'semaphore.give_pass';
    const WARN = 'semaphore.warn';
    const LOCK = 'semaphore.lock';
}

class Semaphore implements Statable
{
    private $state = SemaphoreStates::LOCKED;

    public function getState()
    {
        return $this->state;
    }

    public function setState($state)
    {
        $this->state = $state;
        return $this;
    }
}

class SemaphoreStateMachine extends StateMachine
{
    public function __construct()
    {
        parent::construct();

        foreach (SemaphoreStates::all() as $state) {
            $this->addState($state);
        }

        $transitions = array(
            new Transition(AuctionTransitions::GIVE_PASS, AuctionStates::LOCKED, AuctionStates::OPEN),
            new Transition(AuctionTransitions::GIVE_PASS, AuctionStates::WARNING, AuctionStates::OPEN),
            new Transition(AuctionTransitions::WARN, AuctionStates::OPEN, AuctionStates::WARNING),
            new Transition(AuctionTransitions::WARN, AuctionStates::LOCKED, AuctionStates::WARNING),
            new Transition(AuctionTransitions::LOCK, AuctionStates::OPEN, AuctionStates::LOCKED),
            new Transition(AuctionTransitions::LOCK, AuctionStates::WARNING, AuctionStates::LOCKED),
            );
        foreach ($transitions as $transition) {
            $this->addTransition($transition);
        }
    }
}

Now, you can operate with your state machine:

<?php

$semaphore = new Semaphore;

$machine = new SemaphoreStateMachine;
$machine->execute(SemaphoreTransitions::GIVE_PASS, $semaphore);
$machine->execute(SemaphoreTransitions::WARN, $semaphore);
$machine->execute(SemaphoreTransitions::LOCK, $semaphore);

All versions of state-machine with dependencies

PHP Build Version
Package Version
Requires php Version >=5.3.2
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