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<?php |
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namespace itertools; |
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use DateInterval; |
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use DateTime; |
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use InvalidArgumentException; |
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use IteratorIterator; |
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class StopwatchIterator extends IteratorIterator |
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{ |
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protected $startTime; |
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protected $stopTime; |
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protected $iterationCount; |
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protected $options; |
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protected $printToFileHandle; |
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protected $closePrintToFileHandleOnDestruct; |
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protected $previousPrintTime; |
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public function __construct($iterable, $options = array()) |
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{ |
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parent::__construct(IterUtil::asTraversable($iterable)); |
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$this->iterationCount = 0; |
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$defaultOptions = array( |
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'autoPrint' => false, |
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'printTo' => 'php://stdout', |
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'printInterval' => DateInterval::createFromDateString('5 seconds'), |
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); |
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$this->options = array_merge($defaultOptions, $options); |
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if(! $this->options['printInterval'] instanceof DateInterval) { |
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throw new InvalidArgumentException('printInterval must be an instance of DateInterval'); |
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} |
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$unknownOptions = array_diff(array_keys($options), array_keys($defaultOptions)); |
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if(count($unknownOptions) != 0) { |
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throw new InvalidArgumentException('Unknown options specified: ' . implode(', ', $unknownOptions)); |
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} |
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if($this->options['autoPrint']) { |
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$file = $this->options['printTo']; |
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if(is_resource($file)) { |
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$this->printToFileHandle = $file; |
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$this->closePrintToFileHandleOnDestruct = false; |
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} else if(is_string($file)) { |
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$this->printToFileHandle = @fopen($file, 'a'); |
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if($this->printToFileHandle === false) { |
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throw new InvalidArgumentException("Could not open file with path: '$file'"); |
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} |
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$this->closePrintToFileHandleOnDestruct = true; |
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} else { |
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throw new InvalidArgumentException('You must provide either a stream or filename as printTo argument, you provided a ' . gettype($file)); |
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} |
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} |
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} |
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public function __destruct() |
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{ |
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if(null !== $this->printToFileHandle && $this->closePrintToFileHandleOnDestruct) { |
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fclose($this->printToFileHandle); |
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$this->printToFileHandle = null; |
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} |
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} |
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protected function autoPrintSpeed() |
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{ |
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if(date_create('now')->sub($this->options['printInterval']) < $this->previousPrintTime) { |
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return; |
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} |
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fputs($this->printToFileHandle, "Speed (iterations/second): {$this->getFormattedSpeed()}, Elapsed time (second): {$this->getFormattedElapsedTime()}\n"); |
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$this->previousPrintTime = new DateTime('now'); |
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} |
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public function rewind() |
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{ |
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$this->startTime = microtime(true); |
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$this->stopTime = null; |
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$this->previousPrintTime = new DateTime('now'); |
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$this->iterationCount = 0; |
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parent::rewind(); |
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} |
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public function next() |
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{ |
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if($this->options['autoPrint']) { |
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$this->autoPrintSpeed(); |
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} |
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$this->iterationCount += 1; |
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parent::next(); |
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} |
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public function valid() |
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{ |
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$isValid = parent::valid(); |
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if(! $isValid) { |
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$this->stopTime = microtime(true); |
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} |
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return $isValid; |
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} |
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public function getFormattedSpeed() |
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{ |
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return number_format($this->getSpeed(), 4); |
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} |
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public function getSpeed() |
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{ |
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$elapsedTime = $this->getElapsedTime(); |
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if(0. == $elapsedTime) { |
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return NAN; |
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} |
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return $this->iterationCount / $elapsedTime; |
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} |
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public function getFormattedElapsedTime() |
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{ |
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return number_format($this->getElapsedTime(), 4); |
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} |
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public function getElapsedTime() |
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{ |
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if(null !== $this->stopTime) { |
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return $this->stopTime - $this->startTime; |
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} |
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if(null === $this->startTime) { |
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return 0.; |
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} |
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return microtime(true) - $this->startTime; |
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} |
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public function getIterationCount() |
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{ |
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return $this->iterationCount; |
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} |
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public function getStartTime() |
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{ |
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return $this->startTime; |
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} |
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public function getStopTime() |
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{ |
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return $this->stopTime; |
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} |
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} |
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SuRaMoN /
itertools
