Notify ChangeTracking Policy ile entity alanlarında yapılan değişiklikleri kayıt altına alma

namespace Application\BackendBundle\Entity;

use Application\BackendBundle\Entity\DomainObject\UserDomainObject;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="user")
 */
class User extends UserDomainObject
{
    /**
     * @var int
     *
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @var string
     *
     * @ORM\Column(name="username", type="string", length=20)
     */
    protected $username;

    /**
     * @var string
     *
     * @ORM\Column(name="password", type="string", length=40)
     */
    protected $password;

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set username
     *
     * @param string $username
     * @return User
     */
    public function setUsername($username)
    {
        if ($this->username != $username) {
            $this->onPropertyChanged('username', $this->username, $username);
            $this->username = $username;
        }

        return $this;
    }

    /**
     * Get username
     *
     * @return string 
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * Set password
     *
     * @param string $password
     * @return User
     */
    public function setPassword($password)
    {
        if ($this->password != $password) {
            $this->onPropertyChanged('password', $this->password, $password);
            $this->password = $password;
        }

        return $this;
    }

    /**
     * Get password
     *
     * @return string 
     */
    public function getPassword()
    {
        return $this->password;
    }
}

namespace Application\BackendBundle\Entity\DomainObject;

use Doctrine\Common\NotifyPropertyChanged;
use Doctrine\Common\PropertyChangedListener;

abstract class UserDomainObject implements NotifyPropertyChanged
{
    const LOG_FILE = '../app/logs/listener.log';

    private $log = [];
    private $listeners = [];

    public function addPropertyChangedListener(PropertyChangedListener $listener)
    {
        $this->listeners[] = $listener;
    }

    protected function onPropertyChanged($propName, $oldValue, $newValue)
    {
        if ($this->listeners) {
            $content = file_get_contents(self::LOG_FILE);

            foreach ($this->listeners as $listener) {
                $listener->propertyChanged($this, $propName, $oldValue, $newValue);

                $this->log[] = sprintf(
                    'The value of [%s] has been changed from [%s] to [%s] at [%s].',
                    $propName,
                    $oldValue,
                    $newValue,
                    date('d/m/Y H:i:s')
                );
            }

            if (! empty($this->log)) {
                file_put_contents(self::LOG_FILE, $content . "\n" . implode("\n", $this->log));
                $this->log = [];
            }
        }
    }
}

# app/logs/listener.log

The value of [username] has been changed from [TMRCAL] to [UYBRDA] at [07/07/2015 21:03:13].
The value of [password] has been changed from [1436299385] to [1436299393] at [07/07/2015 21:03:13].
The value of [username] has been changed from [UYBRDA] to [MSUDTG] at [07/07/2015 21:03:18].
The value of [password] has been changed from [1436299393] to [1436299398] at [07/07/2015 21:03:18].