PHP code example of metabor / statemachine

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

metabor / statemachine example snippets

Metabor\Statemachine\Process;
use Metabor\Statemachine\State;
use Metabor\Statemachine\Statemachine;
use Metabor\Statemachine\Transition;

$closed = new State('closed');
$opened = new State('opened');

$eventOpen = 'open';
$eventClose = 'close';
$closed->addTransition(new Transition($opened, $eventOpen));
$closed->addTransition(new Transition($closed, $eventClose));
$opened->addTransition(new Transition($opened, $eventOpen));
$opened->addTransition(new Transition($closed, $eventClose));

// adding some action to events
// the parts of observing the event and executing the command are separated in this example
// normaly it could be put all together into your own command (base)class
$openCommand = new \Metabor\Callback\Callback(
        function ()
        {
            echo 'motor is opening door' . PHP_EOL;
        });
$observerForOpenEvent = new \Metabor\Observer\Callback($openCommand);
$closed->getEvent($eventOpen)->attach($observerForOpenEvent);

$closeCommand = new \Metabor\Callback\Callback(
        function ()
        {
            echo 'motor is closing door' . PHP_EOL;
        });
$observerForCloseEvent = new \Metabor\Observer\Callback($closeCommand);
$opened->getEvent($eventClose)->attach($observerForCloseEvent);

// stateful subject that belongs to this statemachine
$subject = new stdClass();

// start process with closed status;
$initialState = $closed;
$process = new Process('process name', $initialState);

$statemachine = new Statemachine($subject, $process);

echo 'Status:' . $statemachine->getCurrentState()->getName() . PHP_EOL;

echo 'Event:' . $eventOpen . PHP_EOL;
$statemachine->triggerEvent($eventOpen);
echo 'Status:' . $statemachine->getCurrentState()->getName() . PHP_EOL;

// opening an open door would not activate the motor
echo 'Event:' . $eventOpen . PHP_EOL;
$statemachine->triggerEvent($eventOpen);
echo 'Status:' . $statemachine->getCurrentState()->getName() . PHP_EOL;

echo 'Event:' . $eventClose . PHP_EOL;
$statemachine->triggerEvent($eventClose);
echo 'Status:' . $statemachine->getCurrentState()->getName() . PHP_EOL;