Design Pattern: Before/After Pattern

BeforeAfterPattern.php

<?php
# ref: http://hyuki.com/dp/dpinfo.html#BeforeAfter
abstract class  Executor {
	abstract protected function before();
	abstract protected function execute();
	abstract protected function after();
	public function perform () {
		$this->before();
		try {
			$this->execute();
		} finally {
			$this->after();
		}
	}
}
class Action extends Executor {
	protected function before() {
		echo 'before' . PHP_EOL;
	}
	protected function execute() {
		echo 'execute' . PHP_EOL;
		//throw new Exception('Error');
	}
	protected function after() {
		echo 'after' . PHP_EOL;
	}
}

$Action = new Action();
$Action->perform();
?>