Collection < K > function ( ) { return Collections . emptyList ( ) ; }
this method is meant to be overridden to implement collecting of all clusterwide available keys and return them from #getallkeys . concode_field_sep PlaceHolder placeHolder concode_field_sep boolean isAllKeysSupported concode_elem_sep KeyValueSource<K,V> fromMap concode_elem_sep KeyValueSource<K,V> fromMultiMap concode_elem_sep KeyValueSource<String,V> fromList concode_elem_sep Collection<K> getAllKeys concode_elem_sep boolean reset concode_elem_sep boolean hasNext concode_elem_sep KeyValueSource<String,V> fromSet concode_elem_sep boolean open concode_elem_sep K key concode_elem_sep Map.Entry<K,V> element