question: public Multimap < String , String > assembleAllWatchKeys ( String appId , String clusterName , Set < String > namespaces , String dataCenter ) { Multimap < String , String > watchedKeysMap = assembleWatchKeys ( appId , clusterName , namespaces , dataCenter ) ; if ( ! ( namespaces . size ( ) == 1 && namespaces . contains ( ConfigConsts . NAMESPACE_APPLICATION ) ) ) { Set < String > namespacesBelongToAppId = namespacesBelongToAppId ( appId , namespaces ) ; Set < String > publicNamespaces = Sets . difference ( namespaces , namespacesBelongToAppId ) ; if ( ! publicNamespaces . isEmpty ( ) ) { watchedKeysMap . putAll ( findPublicConfigWatchKeys ( appId , clusterName , publicNamespaces , dataCenter ) ) ; } } return watchedKeysMap ; }
target:  Assemble watch keys for the given appId, cluster, namespaces, dataCenter combination