code: @Override
      public void close(boolean deleteProgressFile) {
          final String methodName = "close()";
          traceDebug(methodName, "cacheName=" + this.cacheName + " deleteProgressFile=" + deleteProgressFile);
          if (deleteProgressFile) { // 316654
              // remove the InProgress (dummy) file when close
              deleteInProgressFile();
          }
          try {
              htod.close();
          } catch (Throwable t) {
              com.ibm.ws.ffdc.FFDCFilter.processException(t, "com.ibm.ws.cache.CacheOnDisk.close", "574", this);
              traceDebug(methodName, "cacheName=" + this.cacheName + "\nException: " + ExceptionUtility.getStackTrace(t));
          }
      }
docs: Call this method to close the disk file manager and operation.