PHP DesignPatterns\Visitor\Examples\Logger Logger Examples

Example #1

File: logger_test.php Project: ymnl007/designpatterns

 public function testVisitorHasAccessToLoggerMessage()
 {
     $message = 'User just logged in';
     $log = new Example\Logger($message);
     $emailLogger = new Example\EmailLogger();
     $log->accept($emailLogger);
     $this->assertEquals($message, $emailLogger->getMessage());
 }

Example #2

File: logger_usage.php Project: ymnl007/designpatterns

<?php

require 'logger.php';
use DesignPatterns\Visitor\Examples\Logger as Example;
// This is how it was usually done, you know..
$log = new Example\Logger('System Initialized');
// However, we just realized that we need to log message in a special way..
// But we don't want to modify Logger class, so let's initialize Visitor
// that knows to do the stuff we want like we want
$emailLogger = new Example\EmailLogger();
// Grant access to Visitor ($emailLogger) to enhance functionality of $log
$log->accept($emailLogger);
// ..and now we can use $emailLogger just like we used $log before
// but the result will be different. Nice hacking, no?:)
$emailLogger->log();
echo 'EmailLogger just sent an email with message: ' . $emailLogger->getMessage();