code: void initFileManager() throws IOException, FileManagerException
  
      {
          final String methodName = "initFileManager()";
          object_filemgr = new FileManagerImpl(filename + object_suffix + ".htod", // filename
          false, // automatic coalesce, not reccomended
          "rw", // "r" or "rw"
          physical_disk_manager, // physical file layer
          this);
  
          if (!this.disableDependencyId) {
              dependency_filemgr = new FileManagerImpl(filename + dependency_suffix + ".htod", // filename
              false, // automatic coalesce, not reccomended
              "rw", // "r" or "rw"
              physical_disk_manager, // physical file layer
              this);
          }
  
          if (!this.disableTemplatesSupport) {
              template_filemgr = new FileManagerImpl(filename + template_suffix + ".htod", // filename
              false, // automatic coalesce, not reccomended
              "rw", // "r" or "rw"
              physical_disk_manager, // physical file layer
              this);
          }
      }
docs: ***********************************************************************
  initfileManager()
  Initialize the file manager instance. Caching within the filemanager is
  experimental so it is disabled here.
  ***********************************************************************