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//! Invalidation methods for `CachedDatabaseAdapter`.
//!
//! This module provides view-level and entity-level cache invalidation,
//! including cascade expansion via `CascadeInvalidator`.
use super::adapter::CachedDatabaseAdapter;
use crate::{db::DatabaseAdapter, error::Result};
impl<A: DatabaseAdapter> CachedDatabaseAdapter<A> {
/// Invalidate cache entries that read from specified views.
///
/// Call this after mutations to ensure cache consistency. All cache entries
/// that accessed any of the modified views will be removed.
///
/// # Arguments
///
/// * `views` - List of views/tables that were modified
///
/// # Returns
///
/// Number of cache entries invalidated
///
/// # Errors
///
/// Returns error if cache mutex is poisoned (very rare).
///
/// # Example
///
/// ```rust,no_run
/// # use fraiseql_core::cache::CachedDatabaseAdapter;
/// # use fraiseql_core::db::postgres::PostgresAdapter;
/// # async fn example(adapter: CachedDatabaseAdapter<PostgresAdapter>) -> Result<(), Box<dyn std::error::Error>> {
/// // After creating a user
/// let count = adapter.invalidate_views(&["v_user".to_string()])?;
/// println!("Invalidated {} cache entries", count);
/// # Ok(())
/// # }
/// ```
pub fn invalidate_views(&self, views: &[String]) -> Result<u64> {
// When caching is disabled, both the shard scan and the CascadeInvalidator
// mutex are unnecessary — skip them entirely to avoid serializing mutations.
if !self.cache.is_enabled() {
return Ok(0);
}
// Expand the view list with transitive dependents when a cascade
// invalidator is configured.
if let Some(cascader) = &self.cascade_invalidator {
let mut expanded: std::collections::HashSet<String> = views.iter().cloned().collect();
let mut guard = cascader.lock().map_err(|e| crate::error::FraiseQLError::Internal {
message: format!("Cascade invalidator lock poisoned: {e}"),
source: None,
})?;
for view in views {
let transitive = guard.cascade_invalidate(view)?;
expanded.extend(transitive);
}
let expanded_views: Vec<String> = expanded.into_iter().collect();
return self.cache.invalidate_views(&expanded_views);
}
self.cache.invalidate_views(views)
}
/// Invalidate cache entries based on GraphQL Cascade response entities.
///
/// This is the entity-aware invalidation method that provides more
/// precise invalidation. Instead of invalidating all caches reading from
/// a view, only caches that depend on the affected entities are invalidated.
///
/// # Arguments
///
/// * `cascade_response` - GraphQL mutation response with cascade field
/// * `parser` - `CascadeResponseParser` to extract entities
///
/// # Returns
///
/// Number of cache entries invalidated
///
/// # Example
///
/// ```rust,no_run
/// # use fraiseql_core::cache::{CachedDatabaseAdapter, CascadeResponseParser};
/// # use fraiseql_core::db::postgres::PostgresAdapter;
/// # use serde_json::json;
/// # async fn example(adapter: CachedDatabaseAdapter<PostgresAdapter>) -> Result<(), Box<dyn std::error::Error>> {
/// let cascade_response = json!({
/// "createPost": {
/// "cascade": {
/// "updated": [
/// { "__typename": "User", "id": "uuid-1" }
/// ]
/// }
/// }
/// });
///
/// let parser = CascadeResponseParser::new();
/// let count = adapter.invalidate_cascade_entities(&cascade_response, &parser)?;
/// println!("Invalidated {} cache entries", count);
/// # Ok(())
/// # }
/// ```
///
/// # Note on Performance
///
/// This method replaces view-level invalidation with entity-level invalidation.
/// Instead of clearing all caches that touch a view (e.g., `v_user`), only caches
/// that touch the specific entities are cleared (e.g., User:uuid-1).
///
/// Expected improvement:
/// - **View-level**: 60-70% hit rate (many false positives)
/// - **Entity-level**: 90-95% hit rate (only true positives)
///
/// # Errors
///
/// Returns `FraiseQLError` if the cascade response cannot be parsed.
pub fn invalidate_cascade_entities(
&self,
cascade_response: &serde_json::Value,
parser: &super::cascade_response_parser::CascadeResponseParser,
) -> Result<u64> {
// Parse cascade response to extract affected entities
let cascade_entities = parser.parse_cascade_response(cascade_response)?;
if !cascade_entities.has_changes() {
// No entities affected - no invalidation needed
return Ok(0);
}
// View-level invalidation: convert entity types to view names and evict all
// cache entries that read from those views. This is used for the cascade response
// path where multiple entity types can be affected by a single mutation.
// Unlike the executor's entity-aware path, cascade invalidation uses view-level
// because the cascade entities may not be indexed in the cache by entity ID.
let mut views_to_invalidate = std::collections::HashSet::new();
for entity in cascade_entities.all_affected() {
// Derive view name from entity type (e.g., "User" → "v_user")
let view_name = format!("v_{}", entity.entity_type.to_lowercase());
views_to_invalidate.insert(view_name);
}
let views: Vec<String> = views_to_invalidate.into_iter().collect();
self.cache.invalidate_views(&views)
}
/// Evict only list (multi-row) cache entries for the given views.
///
/// Unlike `invalidate_views()`, leaves single-entity point-lookup entries
/// intact. Used for CREATE mutations: creating a new entity does not affect
/// queries that fetch a *different* existing entity by UUID.
///
/// Expands the view list with transitive dependents when a
/// `CascadeInvalidator` is configured (same logic as `invalidate_views()`).
///
/// # Returns
///
/// Number of cache entries evicted.
///
/// # Errors
///
/// Returns error if the cascade invalidator lock is poisoned.
pub fn invalidate_list_queries(&self, views: &[String]) -> Result<u64> {
if !self.cache.is_enabled() {
return Ok(0);
}
if let Some(cascader) = &self.cascade_invalidator {
let mut expanded: std::collections::HashSet<String> = views.iter().cloned().collect();
let mut guard = cascader.lock().map_err(|e| crate::error::FraiseQLError::Internal {
message: format!("Cascade invalidator lock poisoned: {e}"),
source: None,
})?;
for view in views {
let transitive = guard.cascade_invalidate(view)?;
expanded.extend(transitive);
}
let expanded_views: Vec<String> = expanded.into_iter().collect();
return self.cache.invalidate_list_queries(&expanded_views);
}
self.cache.invalidate_list_queries(views)
}
/// Evict cache entries that contain the given entity UUID.
///
/// Delegates to `QueryResultCache::invalidate_by_entity`. Only entries
/// whose entity-ID index (built at `put()` time) contains the given UUID
/// are removed; all other entries remain warm.
///
/// # Returns
///
/// Number of cache entries evicted.
///
/// # Errors
///
/// Returns error if the cache mutex is poisoned.
pub fn invalidate_by_entity(&self, entity_type: &str, entity_id: &str) -> Result<u64> {
self.cache.invalidate_by_entity(entity_type, entity_id)
}
}