/**
* Locks your script by ensuring that the script is not already running
* @throws ProcessLockerException
*/
public function lock()
{
if ($this->isProcessAlreadyRunning()) {
throw new ProcessLockerException("Process with pid: {$this->originalPid} is already running.");
}
$this->cleanup();
// Store current process's id in the specified pid file location
$currentPid = getmypid();
$this->shell->file_put_contents($this->pidFileLocation, $currentPid);
}
