docs: protected synchronized void invokeBackgroundInvalidation(boolean scan) {
          final String methodName = "invokeBackgroundInvalidation()";
          if (!stopping) {
              synchronized (cod.diskCleanupThread.dcMonitor) {
                  if (cod.diskCleanupThread.currentThread != null) {
                      this.cod.invokeDiskCleanup(scan);
                  } else {
                      if (scan == SCAN) {
                          traceDebug(methodName, "cacheName=" + this.cod.cacheName + " set cleanupDiskPending to true");
                          this.cleanupDiskPending = true;
                      }
                  }
  
              }
          }
      }