observer.php

apache windows下的一款好

<?php
// $Horde: horde/lib/Log/observer.php,v 1.5 2000/06/28 21:36:13 jon Exp $

/**
 * The Log_Observer:: class implements the Observer end of a
 * Subject-Observer pattern for watching log activity and taking
 * actions when notable events occur.
 *
 * @author  Chuck Hagenbuch <[e-mail]>
 * @version $Revision: 1.1.2.2 $
 * @since   Horde 1.3
 */
class Log_Observer {
    
    // {{{ properties
    
    /** The minimum priority level of message that we want to hear
        about. 0 (LOG_EMERG) is the highest priority, so we will only
        hear messages with an integer priority value less than or
        equal to ours. It defaults to LOG_INFO, which listens to
        everything except LOG_DEBUG. */
    var $priority = LOG_INFO;
	
    // }}}
	
	
	// {{{ constructor
	/**
	 * Basic Log_Observer instance that just prints out messages
	 * received.
	 */
	function Log_Observer($priority = LOG_INFO)
    {
		$this->priority = $priority;
	}
	// }}}
	
	
    // {{{ factory()
    /**
     * Attempts to return a concrete Log_Observer instance of the
     * specified type.
     * 
     * @param $observer_type    The type of concrate Log_Observer subclass
     *                          to return.  We will attempt to dynamically
     *                          include the code for this subclass.
     * @return                  The newly created concrete Log_Observer
     * instance, or an false on an error.  */
    function factory($observer_type, $priority = LOG_INFO)
    {
        if (empty($observer_type)) {
            return new Log_Observer($priority);
        }
        
        $observer_type = strtolower(basename($observer_type));
        $class = 'Log_Observer_' . $observer_type;
        if (class_exists($class)) {
            // The observer subclass has already been defined.
            return new $class($priority);
        }
        
        $classfile = 'Log/Observer/' . $observer_type . '.php';
        @include_once $classfile;
        if (class_exists($class)) {
            // We found the class definition somewhere in the include_path.
            return new $class($priority);
        }
        
        // We failed to find the class definition anywhere. Return false.
        return false;
    }
    // }}}
    
    // {{{ notify()
    /**
     * This is a stub method to make sure that Log_Observer classes do
     * something when they are notified of a message. The default
     * behavior is to just print the message, which is obviously not
     * desireable in practically any situation - which is why you need
     * to override this method. :)
     * 
     * @param $messageOb    A hash containing all information - the text
     *                      message itself, the priority, what log it came
     *                      from, etc.
     */
    function notify ($messageOb) {
        print_r($messageOb);
    }
    // }}}
    
}

?>