code: public synchronized void delete(final ICacheManager mgr) {
  		delete = true;
  		if (filename != null) {
  			mgr.deleteFileDelayed(filename);
  		}
  	}
docs: Delete the cached build after the specified delay in minues
  
  @param mgr
  The cache manager. May be null if persist hasn't yet been
  called, in which case, persist will have no effect when it
  is called.