east oriented mailqueue management [WIP]

gistfile1.php

<?php

namespace api\data;

final class data
{
	private
		$value
	;

	function __construct($value)
	{
		if (! is_string($value))
		{
			throw new \domainException('Data should be a string');
		}

		$this->value = $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

namespace api\mail;

final class id
{
	private
		$value
	;

	function __construct($value)
	{
		if (! is_numeric($value))
		{
			throw new \domainException('Mail Id should be a string or a number');
		}

		$this->value = (string) $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

final class address
{
	private
		$value
	;

	function __construct($value)
	{
		if (! filter_var($value, FILTER_VALIDATE_EMAIL))
		{
			throw new \domainException('Mail address is invalid');
		}

		$this->value = $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

final class subject
{
	private
		$value
	;

	function __construct($value)
	{
		if (! is_string($value))
		{
			throw new \domainException('Mail subject should be a string');
		}

		$this->value = $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

final class body
{
	private
		$value
	;

	function __construct($value)
	{
		if (! is_string($value))
		{
			throw new \domainException('Mail body should be a string');
		}

		$this->value = $value;
	}

	function __toString()
	{
		return $this->value;
	}
}

namespace api\mailer;

use
	api\mail
;

interface controller
{
	function mailSentHasId(mail\id $mailId);
	function mailNotSentHasId(mail\id $mailId);
}

namespace api\mailqueue;

use
	api\mail,
	api\mailer
;

interface controller extends mailer\controller
{
}

namespace api;

use
	api\mail,
	api\mailer,
	api\mailqueue
;

class blackhole
{
	function __call($method, $arguments)
	{
		return $this;
	}
}

class mailer
{
	private
		$controller
	;

	function __construct(mailer\controller $controller = null)
	{
		$this->controller = $controller ?: new blackhole;
	}

	function controllerIs(mailer\controller $controller)
	{
		return new self($controller);
	}

	function mailIdAndSenderAndRecipientAndSubjectAndBodyAre(mail\id $id, mail\address $sender, mail\address $recipient, mail\subject $subject, mail\body $body)
	{
		echo 'In mailer, mail with ID \'' . $id . '\' has subject ' . $subject . ' and body ' . $body . PHP_EOL;

		rand(0, 1)
			?
			$this->controller->mailSentHasId($id)
			:
			$this->controller->mailNotSentHasId($id)
		;

		return $this;
	}
}

class backend
{
	private
		$mails,
		$errors
	;

	function __construct()
	{
		$this->mails = [];
		$this->errors = [];
	}

	function mailSenderAndRecipientAndSubjectAndBodyAre(mail\address $sender, mail\address $recipient, mail\subject $subject, mail\body $body)
	{
		$this->mails[] = [ new mail\id(sizeof($this->mails) + 1), $sender, $recipient, $subject, $body ];

		return $this;
	}

	function mailerIs(mailer $mailer)
	{
		$mails = $this->mails;

		foreach ($mails as $mail)
		{
			$mailer->mailIdAndSenderAndRecipientAndSubjectAndBodyAre($mail[0], $mail[1], $mail[2], $mail[3], $mail[4]);
		}

		return $this;
	}

	function mailSentHasId(mail\id $mailId)
	{
		if (isset($this->mails[(string) $mailId]))
		{
			unset($this->mails[(string) $mailId]);
		}

		echo 'In backend, mail with ID \'' . $mailId . '\' successfully sent' . PHP_EOL;

		return $this;
	}

	function mailNotSentHasId(mail\id $mailId)
	{
		$id = (string) $mailId;

		if (isset($this->mails[$id]))
		{
			$this->errors[$id] = $this->mails[$id];
			unset($this->mails[$id]);
		}

		echo 'In backend, mail with ID \'' . $mailId . '\' was not send' . PHP_EOL;

		return $this;
	}
}

class mailqueue implements mailer\controller
{
	private
		$backend,
		$controller
	;

	function __construct(backend $backend)
	{
		$this->backend = $backend;
		$this->controller = new blackhole;
	}

	function controllerIs(mailqueue\controller $controller)
	{
		$mailqueue = clone $this;
		$mailqueue->controller = $controller;

		return $mailqueue;
	}

	function mailSenderAndRecipientAndSubjectAndBodyAre(data\data $sender, data\data $recipient, data\data $subject, data\data $body)
	{
		$mailSender = null;
		$mailRecipient = null;
		$mailSubject = null;
		$mailBody = null;

		try
		{
			$mailSender = new mail\address((string) $sender);
		}
		catch (\domainException $domainException) {}

		try
		{
			$mailRecipient = new mail\address((string) $recipient);
		}
		catch (\domainException $domainException) {}

		try
		{
			$mailSubject = new mail\subject((string) $subject);
		}
		catch (\domainException $domainException) {}

		try
		{
			$mailBody = new mail\body((string) $body);
		}
		catch (\domainException $domainException) {}

		if ($mailSender && $mailRecipient && $mailSubject && $mailBody)
		{
			$this->backend->mailSenderAndRecipientAndSubjectAndBodyAre($mailSender, $mailRecipient, $mailSubject, $mailBody);
		}

		return $this;
	}

	function mailerIs(mailer $mailer)
	{
		$this->backend->mailerIs($mailer->controllerIs($this));

		return $this;
	}

	function mailSentHasId(mail\id $mailId)
	{
		echo 'In mailqueue, mail with ID \'' . $mailId . '\' successfully sent' . PHP_EOL;

		$this->backend->mailSentHasId($mailId);
		$this->controller->mailSentHasId($mailId);

		return $this;
	}

	function mailNotSentHasId(mail\id $mailId)
	{
		echo 'In mailqueue, mail with ID \'' . $mailId . '\' was not send' . PHP_EOL;

		$this->backend->mailNotSentHasId($mailId);
		$this->controller->mailNotSentHasId($mailId);

		return $this;
	}
}

class controller implements mailqueue\controller
{
	private
		$mailqueue
	;

	function __construct(mailqueue $mailqueue)
	{
		$this->mailqueue = $mailqueue->controllerIs($this);
	}

	function mailSenderAndRecipientAndSubjectAndBodyAre(data\data $sender, data\data $recipient, data\data $subject, data\data $body)
	{
		$this->mailqueue->mailSenderAndRecipientAndSubjectAndBodyAre($sender, $recipient, $subject, $body);

		return $this;
	}

	function mailerIs(mailer $mailer)
	{
		$this->mailqueue->mailerIs($mailer);

		return $this;
	}

	function mailSentHasId(mail\id $mailId)
	{
		echo 'Mail with ID \'' . $mailId . '\' successfully sent' . PHP_EOL;

		return $this;
	}

	function mailNotSentHasId(mail\id $mailId)
	{
		echo 'Mail with ID \'' . $mailId . '\' was not send' . PHP_EOL;

		return $this;
	}
}

(new controller(new mailqueue(new backend)))
	->mailSenderAndRecipientAndSubjectAndBodyAre(new data\data('frederic.hardy@mageekbox.net'), new data\data('bertrand.malet@advertstream.com'), new data\data('Hello!'), new data\data('World!'))
		->mailerIs(new mailer)
;