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<?php
/**
* @version $Id: profiler.php 14401 2010-01-26 14:10:00Z louis $
* @package Joomla.Framework
* @subpackage Error
* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();
/**
* Utility class to assist in the process of benchmarking the execution
* of sections of code to understand where time is being spent.
*
* @package Joomla.Framework
* @subpackage Error
* @since 1.0
*/
class JProfiler extends JObject
{
/**
*
* @var int
*/
var $_start = 0;
/**
*
* @var string
*/
var $_prefix = '';
/**
*
* @var array
*/
var $_buffer= null;
/**
* Constructor
*
* @access protected
* @param string Prefix for mark messages
*/
function __construct( $prefix = '' )
{
$this->_start = $this->getmicrotime();
$this->_prefix = $prefix;
$this->_buffer = array();
}
/**
* Returns a reference to the global Profiler object, only creating it
* if it doesn't already exist.
*
* This method must be invoked as:
* <pre> $browser = & JProfiler::getInstance( $prefix );</pre>
*
* @access public
* @param string Prefix used to distinguish profiler objects.
* @return JProfiler The Profiler object.
*/
function &getInstance($prefix = '')
{
static $instances;
if (!isset($instances)) {
$instances = array();
}
if (empty($instances[$prefix])) {
$instances[$prefix] = new JProfiler($prefix);
}
return $instances[$prefix];
}
/**
* Output a time mark
*
* The mark is returned as text enclosed in <div> tags
* with a CSS class of 'profiler'.
*
* @access public
* @param string A label for the time mark
* @return string Mark enclosed in <div> tags
*/
function mark( $label )
{
$mark = $this->_prefix." $label: ";
$mark .= sprintf('%.3f', $this->getmicrotime() - $this->_start) . ' seconds';
if ( function_exists('memory_get_usage') ) {
$mark .= ', '.sprintf('%0.2f', memory_get_usage() / 1048576 ).' MB';
}
$this->_buffer[] = $mark;
return $mark;
}
/**
* Get the current time.
*
* @access public
* @return float The current time
*/
function getmicrotime()
{
list( $usec, $sec ) = explode( ' ', microtime() );
return ((float)$usec + (float)$sec);
}
/**
* Get information about current memory usage.
*
* @access public
* @return int The memory usage
* @link PHP_MANUAL#memory_get_usage
*/
function getMemory()
{
static $isWin;
if (function_exists( 'memory_get_usage' )) {
return memory_get_usage();
} else {
// Determine if a windows server
if (is_null( $isWin )) {
$isWin = (substr(PHP_OS, 0, 3) == 'WIN');
}
// Initialize variables
$output = array();
$pid = getmypid();
if ($isWin) {
// Windows workaround
@exec( 'tasklist /FI "PID eq ' . $pid . '" /FO LIST', $output );
if (!isset($output[5])) {
$output[5] = null;
}
return substr( $output[5], strpos( $output[5], ':' ) + 1 );
} else {
@exec("ps -o rss -p $pid", $output);
return $output[1] *1024;
}
}
}
/**
* Get all profiler marks.
*
* Returns an array of all marks created since the Profiler object
* was instantiated. Marks are strings as per {@link JProfiler::mark()}.
*
* @access public
* @return array Array of profiler marks
*/
function getBuffer() {
return $this->_buffer;
}
}