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Refactor and Implement Send Functionality in Mailer Classes with Usage Example #8

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Refactor and Implement Send Functionality in Mailer Classes with Usage Example #8

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21 changes: 19 additions & 2 deletions 5-dependency-inversion-principle.php
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Original file line number Diff line number Diff line change
Expand Up @@ -21,22 +21,25 @@ interface Mailer
public function send();
}

// Concrete implementation of Mailer using SMTP
class SmtpMailer implements Mailer
{
public function send()
{

echo 'send message from SMTP mailer';
}
}

// Concrete implementation of Mailer using SendGrid
class SendGridMailer implements Mailer
{
public function send()
{

echo 'send message from SendGrid mailer';
}
}

// High-level module that depends on the Mailer abstraction
class SendWelcomeMessage
{
private $mailer;
Expand All @@ -45,4 +48,18 @@ public function __construct(Mailer $mailer)
{
$this->mailer = $mailer;
}

public function sendWelcome()
{
$this->mailer->send();
}
}

// Usage example
$smtpMailer = new SmtpMailer();
$welcomeMessage = new SendWelcomeMessage($smtpMailer);
$welcomeMessage->sendWelcome(); // Outputs: send message from SMTP mailer

$sendGridMailer = new SendGridMailer();
$welcomeMessage = new SendWelcomeMessage($sendGridMailer);
$welcomeMessage->sendWelcome(); // Outputs: send message from SendGrid mailer