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<?php
namespace Startwind\Inventorio\Metrics\Collector\Metric;
use Startwind\Inventorio\Exec\File;
use Startwind\Inventorio\Exec\Runner;
use Startwind\Inventorio\Metrics\Memory\Memory;
abstract class FileLinesMetric implements Metric
{
protected string $filename = '';
protected string $name = '';
public function getName(): string
return $this->name;
}
public function isApplicable(): bool
return File::getInstance()->fileExists($this->filename);
public function getValue(float $lastValue): float
$lastLineCount = Memory::getInstance()->getLastData($this->getName() . '_absolute', -1);
$lineCount = $this->getLineCount($this->filename);
Memory::getInstance()->addData($this->getName() . '_absolute', $lineCount);
// this is the first run we return 0 to skip this value
if ($lastLineCount < 0) {
return 0;
// we assume that there was a log rotation done here
if ($lineCount < $lastLineCount) {
return $lineCount;
return $lineCount - $lastLineCount;
protected function getLineCount($path): int
$count = Runner::getInstance()->run('wc -l ' . $path)->getOutput();
return (int)$count;
startwind /
inventorio-command-line
