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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Profiler; \defined('JPATH_PLATFORM') or die; /** * Utility class to assist in the process of benchmarking the execution * of sections of code to understand where time is being spent. * * @since 1.7.0 */ class Profiler { /** * @var integer The start time. * @since 3.0.0 */ protected $start = 0; /** * @var string The prefix to use in the output * @since 3.0.0 */ protected $prefix = ''; /** * @var array The buffer of profiling messages. * @since 3.0.0 */ protected $buffer = null; /** * @var array The profiling messages. * @since 3.0.0 */ protected $marks = null; /** * @var float The previous time marker * @since 3.0.0 */ protected $previousTime = 0.0; /** * @var float The previous memory marker * @since 3.0.0 */ protected $previousMem = 0.0; /** * @var array JProfiler instances container. * @since 1.7.3 */ protected static $instances = array(); /** * Constructor * * @param string $prefix Prefix for mark messages * * @since 1.7.0 */ public function __construct($prefix = '') { $this->start = microtime(1); $this->prefix = $prefix; $this->marks = array(); $this->buffer = array(); } /** * Returns the global Profiler object, only creating it * if it doesn't already exist. * * @param string $prefix Prefix used to distinguish profiler objects. * * @return Profiler The Profiler object. * * @since 1.7.0 */ public static function getInstance($prefix = '') { if (empty(self::$instances[$prefix])) { self::$instances[$prefix] = new static($prefix); } return self::$instances[$prefix]; } /** * Output a time mark * * @param string $label A label for the time mark * * @return string * * @since 1.7.0 */ public function mark($label) { $current = microtime(1) - $this->start; $currentMem = memory_get_usage() / 1048576; $m = (object) array( 'prefix' => $this->prefix, 'time' => ($current - $this->previousTime) * 1000, 'totalTime' => ($current * 1000), 'memory' => $currentMem - $this->previousMem, 'totalMemory' => $currentMem, 'label' => $label, ); $this->marks[] = $m; $mark = sprintf( '%s %.3f seconds (%.3f); %0.2f MB (%0.3f) - %s', $m->prefix, $m->totalTime / 1000, $m->time / 1000, $m->totalMemory, $m->memory, $m->label ); $this->buffer[] = $mark; $this->previousTime = $current; $this->previousMem = $currentMem; return $mark; } /** * Get all profiler marks. * * Returns an array of all marks created since the Profiler object * was instantiated. Marks are objects as per {@link JProfiler::mark()}. * * @return array Array of profiler marks * * @since 1.7.0 */ public function getMarks() { return $this->marks; } /** * Get all profiler mark buffers. * * Returns an array of all mark buffers created since the Profiler object * was instantiated. Marks are strings as per {@link Profiler::mark()}. * * @return array Array of profiler marks * * @since 1.7.0 */ public function getBuffer() { return $this->buffer; } /** * Sets the start time. * * @param double $startTime Unix timestamp in microseconds for setting the Profiler start time. * @param int $startMem Memory amount in bytes for setting the Profiler start memory. * * @return $this For chaining * * @since 3.0.0 */ public function setStart($startTime = 0.0, $startMem = 0) { $this->start = (double) $startTime; $this->previousMem = (int) $startMem / 1048576; return $this; } }