Struct SystemLabelPersistence 

pub struct SystemLabelPersistence { /* private fields */ }

Persistence backend for the host’s declared-plugin records.

Today’s implementation: a JSON sidecar at <data_path>/_system/declared_plugins.json (atomic write-then-rename; the same mechanism as JsonFilePersistence).

Cutover target: Cypher MERGE (:_DeclaredPlugin {...}) through the write-enabled QueryProcedureHost::execute_inner_query shipped by A.1. The cutover preserves the DeclaredPlugin serde shape (per proposal §9.7), so swapping the backend is a no-op at the Persistence trait surface.

Implementations

impl SystemLabelPersistence

pub fn new(data_path: impl Into<PathBuf>) -> Self

Construct rooted at data_path/_system/declared_plugins.json.

data_path is the database’s filesystem root (the URI passed to Uni::open for local-disk instances). For in-memory / object-store instances where no local root exists, callers fall back to uni_plugin_custom::NullPersistence.

Examples

let p = SystemLabelPersistence::new(PathBuf::from("/tmp/mydb"));
assert!(p.sidecar_path().ends_with("declared_plugins.json"));

pub fn sidecar_path(&self) -> &Path

Borrow the underlying sidecar path (for diagnostics + tests).

pub fn cypher_sink(&self) -> &Arc<LazyCypherSink>

Borrow the lazy cypher sink so the host can wire it after Uni::build completes.

Trait Implementations

impl Debug for SystemLabelPersistence

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

Formats the value using the given formatter.

impl Persistence for SystemLabelPersistence

fn save(&self, plugin: &DeclaredPlugin) -> Result<(), PersistenceError>

Persist a freshly-declared plugin record.

fn delete(&self, qname: &str) -> Result<(), PersistenceError>

Remove a previously persisted record by qname.

fn load_all(&self) -> Result<Vec<DeclaredPlugin>, PersistenceError>

Replay every persisted declaration (in any order — callers must topologically sort if dependency ordering matters).