PHP code example of mad654 / php-event-store

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

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

    

mad654 / php-event-store example snippets

class LightSwitch {	
    private $state = false;
    
    public function isOn(): bool {
        return $this->state;
    }
    
    public function switchOn()
    {
        if ($this->state === true) return;
        // do some stuff which does the hard work
        $this->state = true;
    }
    
    public function switchOff()
    {
        if ($this->state === false) return;
         // do some stuff which does the hard work
        $this->state = false;
    }
}

use mad654\eventstore\Event;
use mad654\eventstore\Event\StateChanged;
use mad654\eventstore\EventSourcedObject;
use mad654\eventstore\EventStream\AutoTrackingEventSourcedObjectTrait;
use mad654\eventstore\SubjectId;

class LightSwitch implements EventSourcedObject
{
    use AutoTrackingEventSourcedObjectTrait;

    /**
     * @var bool
     */
    private $state;

    public function __construct(SubjectId $id)
    {
        $this->init($id, ['state' => false]);
    }

    public function isOn(): bool
    {
        return $this->state;
    }

    public function switchOn(): void
    {
        if ($this->state) return;
        $this->record(new StateChanged($this->subjectId(), ['state' => true]));
    }

    public function switchOff(): void
    {
        if (!$this->state) return;
        $this->record(new StateChanged($this->subjectId(), ['state' => false]));
    }

    public function on(Event $event): void
    {
        $this->state = $event->get('state', $this->state);
    }

}

use mad654\eventstore\FileEventStream\FileEventStreamFactory;
use mad654\eventstore\EventObjectStore;

$factory = new FileEventStreamFactory("/tmp/eventstore-example");
$store = new EventSourcedObjectStore($factory);

$store->attach($someEventSourcedObject);
unset($someEventSourcedObject);
$id = StringSubjectId::fromString('id-of-some-object');
$someEventEmitter = $store->get($id);

use mad654\eventstore\FileEventStream\FileEventStreamFactory;
use mad654\eventstore\EventObjectStore;

$factory = new FileEventStreamFactory("/tmp/eventstore-example");
$store = new EventSourcedObjectStore($factory);

$switch = new LightSwitch('kitchen');
$store->attach($switch);

$store->get(StringSubjectId::fromString('kitchen'))->switchOff();

$renderer = new ArrayEventStreamRenderer();
$store->get(StringSubjectId::fromString('kitchen'))->history($renderer);
$data = $renderer->toArray();

// use symonfy command style to render a nice table on command line
$io = new SymfonyStyle($input, $output);
$io->table(
    ['nr', 'timestamp', 'event_type', 'id', 'property', 'new_state'],
    $data
);

# nr | timestamp           | event_type   | id       | property | new_state
# 1  | 2018-12-01 18:10:00 | StateChanged | kittchen | state    | on
# 2  | 2018-12-01 18:12:00 | StateChanged | kittchen | state    | off
# 3  | 2018-12-01 19:30:00 | StateChanged | kittchen | state    | on
# 4  | 2018-12-03 18:10:00 | StateChanged | kittchen | state    | off

 php
$store->get(StringSubjectId::fromString('kitchen'))->switchOn();