/**
* @param string $fileName
* @param string $content
* @throws FileSystemException
* @return bool
*/
public function writeResultFile($fileName, $content)
{
/**
* Rename is atomic on *nix systems, while file_put_contents is not. Writing to a
* temporary file whose name is process-unique and renaming to the real location helps
* avoid race conditions. Race condition can occur if the compiler has not been run, when
* multiple processes are attempting to access the generated file simultaneously.
*/
$content = "<?php\n" . $content;
$tmpFile = $fileName . "." . getmypid();
$this->filesystemDriver->filePutContents($tmpFile, $content);
try {
$success = $this->filesystemDriver->rename($tmpFile, $fileName);
} catch (FileSystemException $e) {
if (!$this->fileExists($fileName)) {
throw $e;
} else {
/**
* Due to race conditions, file may have already been written, causing rename to fail. As long as
* the file exists, everything is okay.
*/
$success = true;
}
}
return $success;
}
