code: public static JournalStore create(Path path, boolean isMmap)
      throws IOException
    {
      // RampManager rampManager = Ramp.newManager();
      
      long segmentSize = 4 * 1024 * 1024;
      
      JournalStore.Builder builder = JournalStore.Builder.create(path);
      
      builder.segmentSize(segmentSize);
      // builder.rampManager(rampManager);
      builder.mmap(isMmap);
      
      JournalStore store = builder.build();
  
      return store;
    }
docs: Creates an independent store.