code: private void validateBeforeStart() {
          LibraryUtils.checkArgumentNotNull(config, "Configuration is null.");
          config.validate();
  
          LibraryUtils.checkArgumentNotNull(sourceFilter, "sourceFilter is null.");
          LibraryUtils.checkArgumentNotNull(eventFilter, "eventFilter is null.");
          LibraryUtils.checkArgumentNotNull(eventsProcessor, "eventsProcessor is null.");
          LibraryUtils.checkArgumentNotNull(progressReporter, "progressReporter is null.");
          LibraryUtils.checkArgumentNotNull(exceptionHandler, "exceptionHandler is null.");
  
          LibraryUtils.checkArgumentNotNull(scheduledThreadPool, "scheduledThreadPool is null.");
          LibraryUtils.checkArgumentNotNull(mainThreadPool, "mainThreadPool is null.");
          LibraryUtils.checkArgumentNotNull(readerFactory, "readerFactory is null.");
      }
docs: Validate the user's input before processing logs.