130 lines
4 KiB
PHP
130 lines
4 KiB
PHP
<?php
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/**
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* $Header$
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* $Horde: horde/lib/Log/observer.php,v 1.5 2000/06/28 21:36:13 jon Exp $
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*
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* @version $Revision: 211953 $
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* @package Log
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*/
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/**
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* The Log_observer:: class implements the Observer end of a Subject-Observer
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* pattern for watching log activity and taking actions on exceptional events.
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*
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* @author Chuck Hagenbuch <chuck@horde.org>
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* @since Horde 1.3
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* @since Log 1.0
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* @package Log
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*
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* @example observer_mail.php An example Log_observer implementation.
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*/
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class Log_observer
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{
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/**
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* Instance-specific unique identification number.
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*
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* @var integer
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* @access private
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*/
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var $_id = 0;
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/**
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* The minimum priority level of message that we want to hear about.
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* PEAR_LOG_EMERG is the highest priority, so we will only hear messages
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* with an integer priority value less than or equal to ours. It defaults
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* to PEAR_LOG_INFO, which listens to everything except PEAR_LOG_DEBUG.
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*
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* @var string
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* @access private
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*/
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var $_priority = PEAR_LOG_INFO;
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/**
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* Creates a new basic Log_observer instance.
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*
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* @param integer $priority The highest priority at which to receive
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* log event notifications.
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*
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* @access public
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*/
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function __construct($priority = PEAR_LOG_INFO)
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{
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$this->_id = md5(microtime());
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$this->_priority = $priority;
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}
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/**
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* Attempts to return a new concrete Log_observer instance of the requested
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* type.
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*
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* @param string $type The type of concreate Log_observer subclass
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* to return.
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* @param integer $priority The highest priority at which to receive
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* log event notifications.
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* @param array $conf Optional associative array of additional
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* configuration values.
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*
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* @return object The newly created concrete Log_observer
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* instance, or null on an error.
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*/
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function &factory($type, $priority = PEAR_LOG_INFO, $conf = array())
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{
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$type = strtolower($type);
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$class = 'Log_observer_' . $type;
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/*
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* If the desired class already exists (because the caller has supplied
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* it from some custom location), simply instantiate and return a new
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* instance.
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*/
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if (class_exists($class)) {
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$object = new $class($priority, $conf);
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return $object;
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}
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/* Support both the new-style and old-style file naming conventions. */
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$newstyle = true;
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$classfile = dirname(__FILE__) . '/observer_' . $type . '.php';
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if (!file_exists($classfile)) {
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$classfile = 'Log/' . $type . '.php';
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$newstyle = false;
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}
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/*
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* Attempt to include our version of the named class, but don't treat
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* a failure as fatal. The caller may have already included their own
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* version of the named class.
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*/
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@include_once $classfile;
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/* If the class exists, return a new instance of it. */
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if (class_exists($class)) {
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/* Support both new-style and old-style construction. */
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if ($newstyle) {
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$object = new $class($priority, $conf);
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} else {
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$object = &new $class($priority);
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}
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return $object;
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}
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$null = null;
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return $null;
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}
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/**
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* This is a stub method to make sure that Log_Observer classes do
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* something when they are notified of a message. The default behavior
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* is to just print the message, which is obviously not desireable in
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* practically any situation - which is why you need to override this
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* method. :)
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*
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* @param array $event A hash describing the log event.
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*/
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function notify($event)
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{
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print_r($event);
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}
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}
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