pub struct QueryRegistry { /* private fields */ }Expand description
Registry mapping query types to shard assignments.
No macro magic. Queries are registered at startup via
QueryDb::register::<MyQuery>(). The registry maps TypeId to a shard
index derived from the TypeId’s hash.
Implementations§
Source§impl QueryRegistry
impl QueryRegistry
Sourcepub fn register<Q: DerivedQuery>(&mut self)
pub fn register<Q: DerivedQuery>(&mut self)
Registers a query type for cache routing.
Idempotent: re-registering the same query type is a no-op. DB14
relies on this so the built-in queries pre-registered by
QueryDb::new do not conflict with legacy
call-sites (or tests) that also call QueryDb::register.
Sourcepub fn shard_for<Q: DerivedQuery>(&self, shard_count: usize) -> usize
pub fn shard_for<Q: DerivedQuery>(&self, shard_count: usize) -> usize
Returns the shard index for a query type.
The shard index is deterministic: u64::from(Q::QUERY_TYPE_ID) & (shard_count - 1). This ensures the same query type always maps to
the same shard across process boundaries — critical for PN3
cold-load, where ShardedCache::insert_validated places rehydrated
entries into the exact shard a later typed QueryDb::get::<Q> will
probe. shard_count is required to be a power of two.
Sourcepub fn shard_for_query_type_id(query_type_id: u32, shard_count: usize) -> usize
pub fn shard_for_query_type_id(query_type_id: u32, shard_count: usize) -> usize
Type-erased shard-routing helper. Given a query_type_id (equivalent to
Q::QUERY_TYPE_ID), returns the shard index. Used by PN3 cold-load
(ShardedCache::insert_validated) where the concrete Q is not known.
Sourcepub fn registered_count(&self) -> usize
pub fn registered_count(&self) -> usize
Returns the number of registered query types.
Trait Implementations§
Auto Trait Implementations§
impl Freeze for QueryRegistry
impl RefUnwindSafe for QueryRegistry
impl Send for QueryRegistry
impl Sync for QueryRegistry
impl Unpin for QueryRegistry
impl UnsafeUnpin for QueryRegistry
impl UnwindSafe for QueryRegistry
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