Factory Method

Description

• Create các object mà không cần chỉ định class cấu trúc.
• Define a method để tạo object thay cho việc dùng operator (new Class).

Example

Send notification

abstract class Notification
{
    abstract public function getDriver(): NotificationDriver;

    public function send(string $message): void
    {
        $driver = $this->getDriver();
        $driver->connect();
        $driver->send($message);
    }
}

interface NotificationDriver
{
    public function connect(): void;

    public function send(string $message): void;
}

Send notification bằng Mail:

class MailNotification extends Notification
{
    protected string $mail;
    protected string $password;

    public function __construct(string $mail, string $password)
    {
        $this->mail = $mail;
        $this->password = $password;
    }

    public function getDriver(): NotificationDriver
    {
        return new MailDriver($this->mail, $this->password);
    }

}

class MailDriver implements NotificationDriver
{
    protected string $mail;
    protected string $password;

    public function __construct(string $mail, string $password)
    {
        $this->mail = $mail;
        $this->password = $password;
    }

    public function connect(): void
    {
        // TODO: Connect mail with mail and password.
    }

    public function send(string $message): void
    {
        // TODO: mail send
    }
}

Send notification:

class SlackNotification extends Notification
{
    public function getDriver(): NotificationDriver
    {
        return new SlackDriver();
    }
}

class SlackDriver implements NotificationDriver
{
    public function connect(): void
    {
        // TODO: Implement connect() method for the slack.
    }

    public function send(string $message): void
    {
        // TODO: slack send
    }
}

Usage:

$notification = new MailNotification("admin@gmail.com", "123456");
$notification->send("Send notification message for Factory Method example");

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Refer: https://refactoring.guru/design-patterns/factory-method/php/example