public PrintService(string backupFilePath)
{
backupFileLocation = backupFilePath;
LoadQueueFromFile();
executor = new PrintExecutor(queue);
executor.Start();
}
//for unittests/DI
public PrintService(IDynamicQueue <JobDetails> _queue, IJobExecutor <JobDetails> _executor)
{
queue = _queue;
executor = _executor;
executor.Start();
}