// NumFilter return the filter count
NumFilter return the filter count
// NumFilter return the filter count
func (fm *filterManager) NumFilter() int {
	fm.fmLocker.RLock()
	defer fm.fmLocker.RUnlock()
	return len(fm.filters)
}
func ( fm * filterManager ) NumFilter ( ) int { fm . fmLocker . RLock ( ) defer fm . fmLocker . RUnlock ( ) return len ( fm . filters ) }
NumFilter return the filter count
NumFilter return the filter count