static public void setPersistenceCache(DiskCache2 dc) {
    diskCache2 = dc;
    if (diskCache2 != null)
      diskCache2.setAlwaysUseCache(true); // the persistence cache file has same name as the ncml - must put it into the cache else clobber ncml  7/31/2014
  }
static public void setPersistenceCache(DiskCache2 dc) {
    diskCache2 = dc;
    if (diskCache2 != null)
      diskCache2.setAlwaysUseCache(true); 
  }
static public void setPersistenceCache ( DiskCache2 dc ) { diskCache2 = dc ; if ( diskCache2 != null ) diskCache2 . setAlwaysUseCache ( true ) ; // the persistence cache file has same name as the ncml - must put it into the cache else clobber ncml  7/31/2014
 }
this is where  persist() reads/writes files
this is where persist () reads / writes files