Struct ViewStore 

pub struct ViewStore { /* private fields */ }

Implementations

impl ViewStore

pub fn new() -> ViewStore

pub fn views(&self) -> impl Iterator<Item = &ViewDef>

pub fn is_empty(&self) -> bool

pub fn has_view(&self, name: &str) -> bool

pub fn view_for_prop(&self, prop_name: &str) -> Option<&str>

If prop_name is managed by any view, return that view’s name.

pub fn create_view( &mut self, def: ViewDef, props: &mut ColumnStore, topo: &TopologyView<'_>, ids: &IdMap, syms: &Interner, labels: &[u32], ) -> Result<(), String>

Register a view and backfill values for all existing nodes.

Errors

• Duplicate view name.
• view_prop already claimed by another view.
• view_prop already present as a real node property in ColumnStore.

pub fn restore_view(&mut self, def: ViewDef) -> Result<(), String>

Restore a view definition from a snapshot without collision checking or backfilling. The snapshot’s ColumnStore already contains view values; this method simply registers the definition so the store is aware of it.

Called only from open_with during snapshot restore. Callers must then call rebuild_all to ensure values are correct after WAL replay.

pub fn delete_view( &mut self, name: &str, props: &mut ColumnStore, ids: &IdMap, labels: &[u32], syms: &Interner, ) -> Result<(), String>

Remove a view and delete its values from every node.

Errors

• View not found.

pub fn on_edge_changed( &self, etype: u32, src: u32, dst: u32, inserted: bool, props: &mut ColumnStore, topo: &TopologyView<'_>, ids: &IdMap, syms: &Interner, labels: &[u32], base_cols: Option<&ArchivedColumnsData>, )

Called when an edge of type etype (symbol) between src and dst is inserted (inserted=true) or deleted (inserted=false).

Covers both manual user edges and derived engine edges. The topo must already reflect the new state (edge added before this call on insert; edge removed before this call on delete) so that full-recompute paths (Avg, Min, Max) see correct neighbor sets.

pub fn on_prop_changed( &self, changed_node: u32, field: &str, props: &mut ColumnStore, topo: &TopologyView<'_>, ids: &IdMap, syms: &Interner, labels: &[u32], base_cols: Option<&ArchivedColumnsData>, )

Called after SetProp / RemoveProp — finds NeighborAgg views that read field from neighbors and recomputes values for all subject nodes.

pub fn init_node_views( &self, node: u32, props: &mut ColumnStore, syms: &Interner, labels: &[u32], )

Initialize view values for a newly inserted node.

Sets Degree, Count, and Sum views to their zero values (0 / 0.0). Avg / Min / Max are left absent — there is no sensible neutral value when no neighbors have been observed yet.

Call this BEFORE the rule engine’s on_node_changed for the new node so that subsequent on_edge_changed calls (from derived-edge deltas) can increment correctly from a known baseline.

pub fn rebuild_all( &self, props: &mut ColumnStore, topo: &TopologyView<'_>, ids: &IdMap, syms: &Interner, labels: &[u32], )

Recompute all view values from scratch. Called on open after WAL replay so values are consistent with persisted graph state.

Trait Implementations

impl Clone for ViewStore

fn clone(&self) -> ViewStore

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ViewStore

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for ViewStore

fn default() -> ViewStore

Returns the “default value” for a type.