oxirs_arq/
cache_integration.rs

1//! Advanced Caching Integration for OxiRS ARQ Query Engine
2//!
3//! This module integrates the shared advanced caching system with the ARQ query processor
4//! to provide high-performance caching for query plans, results, and intermediate computations.
5
6use crate::{
7    algebra::{Algebra, Solution, Term, Variable},
8    query::Query,
9    Result,
10};
11use serde::{Deserialize, Serialize};
12use std::collections::HashMap;
13use std::hash::{Hash, Hasher};
14use std::sync::Arc;
15use std::time::Duration;
16
17// Import the shared cache from parent engine module
18// For now, we'll define basic cache traits locally until the module structure is fixed
19pub trait CacheKey: Clone + std::hash::Hash + Eq + Send + Sync {}
20pub trait CacheValue: Clone + Send + Sync {}
21
22// Implement CacheKey for String
23impl CacheKey for String {}
24
25// Implement CacheValue for StatisticsSnapshot
26impl CacheValue for StatisticsSnapshot {}
27
28// Placeholder for AdvancedCache until shared_cache is properly imported
29#[derive(Debug)]
30pub struct AdvancedCache<K, V> {
31    _phantom: std::marker::PhantomData<(K, V)>,
32}
33
34impl<K: CacheKey, V: CacheValue> AdvancedCache<K, V> {
35    pub fn new(_config: AdvancedCacheConfig) -> Self {
36        Self {
37            _phantom: std::marker::PhantomData,
38        }
39    }
40
41    pub fn get(&self, _key: &K) -> Option<V> {
42        None
43    }
44
45    pub fn put(&self, _key: K, _value: V) -> Result<()> {
46        Ok(())
47    }
48
49    pub fn warm_cache(&self) -> Result<()> {
50        Ok(())
51    }
52
53    pub fn clear(&self) {
54        // No-op for placeholder
55    }
56}
57
58// Placeholder for AdvancedCacheConfig
59#[derive(Debug, Clone)]
60pub struct AdvancedCacheConfig {
61    pub l1_cache_size: usize,
62    pub l2_cache_size: usize,
63    pub l3_cache_size: usize,
64    pub enable_compression: bool,
65}
66
67impl Default for AdvancedCacheConfig {
68    fn default() -> Self {
69        Self {
70            l1_cache_size: 1024,
71            l2_cache_size: 4096,
72            l3_cache_size: 16384,
73            enable_compression: false,
74        }
75    }
76}
77
78/// ARQ-specific cache configuration
79#[derive(Debug, Clone)]
80pub struct ArqCacheConfig {
81    /// Query plan cache configuration
82    pub query_plan_cache: AdvancedCacheConfig,
83    /// Query result cache configuration
84    pub query_result_cache: AdvancedCacheConfig,
85    /// BGP evaluation cache configuration
86    pub bgp_cache: AdvancedCacheConfig,
87    /// Statistics cache configuration
88    pub statistics_cache: AdvancedCacheConfig,
89    /// Enable cross-query optimization caching
90    pub enable_cross_query_caching: bool,
91    /// Maximum query result size to cache (bytes)
92    pub max_result_size: usize,
93    /// Query similarity threshold for result reuse
94    pub query_similarity_threshold: f64,
95}
96
97impl Default for ArqCacheConfig {
98    fn default() -> Self {
99        let base_config = AdvancedCacheConfig {
100            l1_cache_size: 5000, // Smaller for query plans
101            l2_cache_size: 20000,
102            l3_cache_size: 100000,
103            ..Default::default()
104        };
105
106        let result_config = AdvancedCacheConfig {
107            l1_cache_size: 1000, // Results can be large
108            l2_cache_size: 5000,
109            l3_cache_size: 20000,
110            enable_compression: true,
111        };
112
113        Self {
114            query_plan_cache: base_config.clone(),
115            query_result_cache: result_config,
116            bgp_cache: base_config.clone(),
117            statistics_cache: base_config,
118            enable_cross_query_caching: true,
119            max_result_size: 10 * 1024 * 1024, // 10MB
120            query_similarity_threshold: 0.8,
121        }
122    }
123}
124
125/// Cached query plan
126#[derive(Debug, Clone, Serialize, Deserialize)]
127pub struct CachedQueryPlan {
128    /// The optimized algebra
129    pub algebra: Algebra,
130    /// Estimated execution cost
131    pub estimated_cost: f64,
132    /// Optimization metadata
133    pub optimization_metadata: OptimizationMetadata,
134    /// Statistics used for optimization
135    pub statistics_snapshot: StatisticsSnapshot,
136}
137
138/// Optimization metadata
139#[derive(Debug, Clone, Serialize, Deserialize)]
140pub struct OptimizationMetadata {
141    /// Optimizations applied
142    pub optimizations_applied: Vec<String>,
143    /// Optimization time
144    pub optimization_time_ms: u64,
145    /// Selectivity estimates
146    pub selectivity_estimates: HashMap<String, f64>,
147    /// Join order decisions
148    pub join_order: Vec<String>,
149}
150
151/// Statistics snapshot for cache validation
152#[derive(Debug, Clone, Serialize, Deserialize)]
153pub struct StatisticsSnapshot {
154    /// Dataset size when cached
155    pub dataset_size: usize,
156    /// Predicate cardinalities
157    pub predicate_cardinalities: HashMap<String, usize>,
158    /// Snapshot timestamp
159    pub timestamp: u64,
160    /// Statistics version
161    pub version: String,
162}
163
164/// Cached query result
165#[derive(Debug, Clone)]
166pub struct CachedQueryResult {
167    /// Result solutions
168    pub solutions: Vec<Solution>,
169    /// Result metadata
170    pub metadata: QueryResultMetadata,
171    /// Result size in bytes
172    pub size_bytes: usize,
173}
174
175/// Query result metadata
176#[derive(Debug, Clone)]
177pub struct QueryResultMetadata {
178    /// Execution time when cached
179    pub execution_time: Duration,
180    /// Dataset version when executed
181    pub dataset_version: String,
182    /// Variables in result
183    pub variables: Vec<Variable>,
184    /// Total solution count
185    pub solution_count: usize,
186    /// Whether result is complete or partial
187    pub is_complete: bool,
188}
189
190/// Cache key for query plans
191#[derive(Debug, Clone, Hash, PartialEq, Eq)]
192pub struct QueryPlanCacheKey {
193    /// Normalized query hash
194    pub query_hash: u64,
195    /// Dataset schema hash
196    pub schema_hash: u64,
197    /// Optimization level
198    pub optimization_level: OptimizationLevel,
199    /// Configuration parameters
200    pub config_hash: u64,
201}
202
203/// Cache key for query results
204#[derive(Debug, Clone, PartialEq, Eq)]
205pub struct QueryResultCacheKey {
206    /// Query signature
207    pub query_signature: QuerySignature,
208    /// Dataset version
209    pub dataset_version: String,
210    /// Parameter bindings (for parameterized queries)
211    pub parameter_bindings: HashMap<String, String>,
212}
213
214impl std::hash::Hash for QueryResultCacheKey {
215    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
216        self.query_signature.hash(state);
217        self.dataset_version.hash(state);
218        // Hash the parameter bindings in a deterministic way
219        let mut sorted_params: Vec<_> = self.parameter_bindings.iter().collect();
220        sorted_params.sort_by_key(|(k, _)| *k);
221        for (k, v) in sorted_params {
222            k.hash(state);
223            v.hash(state);
224        }
225    }
226}
227
228/// Query signature for result caching
229#[derive(Debug, Clone, Hash, PartialEq, Eq)]
230pub struct QuerySignature {
231    /// Canonical query form
232    pub canonical_form: String,
233    /// Variable set
234    pub variables: Vec<String>,
235    /// Operation type
236    pub operation_type: QueryOperationType,
237    /// Complexity score
238    pub complexity_score: u32,
239}
240
241/// Query operation types
242#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
243pub enum QueryOperationType {
244    Select,
245    Construct,
246    Ask,
247    Describe,
248    Update,
249}
250
251/// Optimization levels
252#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
253pub enum OptimizationLevel {
254    Basic,
255    Standard,
256    Aggressive,
257    Custom(u32),
258}
259
260/// Cache key for BGP evaluations
261#[derive(Debug, Clone, Hash, PartialEq, Eq)]
262pub struct BgpCacheKey {
263    /// BGP pattern hash
264    pub pattern_hash: u64,
265    /// Variable bindings
266    pub bindings_hash: u64,
267    /// Graph context
268    pub graph_context: Option<String>,
269}
270
271/// Cached BGP result
272#[derive(Debug, Clone)]
273pub struct CachedBgpResult {
274    /// Solutions found
275    pub solutions: Vec<Solution>,
276    /// Evaluation metadata
277    pub metadata: BgpEvaluationMetadata,
278}
279
280/// BGP evaluation metadata
281#[derive(Debug, Clone)]
282pub struct BgpEvaluationMetadata {
283    /// Evaluation time
284    pub evaluation_time: Duration,
285    /// Solutions count
286    pub solution_count: usize,
287    /// Index hits
288    pub index_hits: usize,
289    /// Selectivity achieved
290    pub selectivity: f64,
291}
292
293/// Advanced cache manager for ARQ
294pub struct ArqCacheManager {
295    /// Query plan cache
296    query_plan_cache: Arc<AdvancedCache<QueryPlanCacheKey, CachedQueryPlan>>,
297    /// Query result cache
298    query_result_cache: Arc<AdvancedCache<QueryResultCacheKey, CachedQueryResult>>,
299    /// BGP evaluation cache
300    bgp_cache: Arc<AdvancedCache<BgpCacheKey, CachedBgpResult>>,
301    /// Statistics cache
302    statistics_cache: Arc<AdvancedCache<String, StatisticsSnapshot>>,
303    /// Configuration
304    config: ArqCacheConfig,
305    /// Cache statistics
306    cache_stats: Arc<std::sync::RwLock<ArqCacheStatistics>>,
307}
308
309/// ARQ cache statistics
310#[derive(Debug, Clone, Default)]
311pub struct ArqCacheStatistics {
312    /// Query plan cache hits
313    pub plan_cache_hits: usize,
314    /// Query plan cache misses
315    pub plan_cache_misses: usize,
316    /// Result cache hits
317    pub result_cache_hits: usize,
318    /// Result cache misses
319    pub result_cache_misses: usize,
320    /// BGP cache hits
321    pub bgp_cache_hits: usize,
322    /// BGP cache misses
323    pub bgp_cache_misses: usize,
324    /// Total time saved (milliseconds)
325    pub time_saved_ms: u64,
326    /// Average cache lookup time
327    pub avg_lookup_time_us: f64,
328    /// Cache efficiency score
329    pub efficiency_score: f64,
330}
331
332impl ArqCacheManager {
333    /// Create new ARQ cache manager
334    pub fn new(config: ArqCacheConfig) -> Self {
335        Self {
336            query_plan_cache: Arc::new(AdvancedCache::new(config.query_plan_cache.clone())),
337            query_result_cache: Arc::new(AdvancedCache::new(config.query_result_cache.clone())),
338            bgp_cache: Arc::new(AdvancedCache::new(config.bgp_cache.clone())),
339            statistics_cache: Arc::new(AdvancedCache::new(config.statistics_cache.clone())),
340            config,
341            cache_stats: Arc::new(std::sync::RwLock::new(ArqCacheStatistics::default())),
342        }
343    }
344
345    /// Get cached query plan
346    pub fn get_query_plan(&self, key: &QueryPlanCacheKey) -> Option<CachedQueryPlan> {
347        let start_time = std::time::Instant::now();
348        let result = self.query_plan_cache.get(key);
349
350        {
351            let mut stats = self.cache_stats.write().expect("lock poisoned");
352            if result.is_some() {
353                stats.plan_cache_hits += 1;
354            } else {
355                stats.plan_cache_misses += 1;
356            }
357            self.update_avg_lookup_time(&mut stats, start_time.elapsed());
358        }
359
360        result
361    }
362
363    /// Cache query plan
364    pub fn cache_query_plan(&self, key: QueryPlanCacheKey, plan: CachedQueryPlan) -> Result<()> {
365        self.query_plan_cache.put(key, plan)?;
366        Ok(())
367    }
368
369    /// Get cached query result
370    pub fn get_query_result(&self, key: &QueryResultCacheKey) -> Option<CachedQueryResult> {
371        let start_time = std::time::Instant::now();
372
373        // Validate cache key freshness
374        if !self.is_result_cache_valid(key) {
375            return None;
376        }
377
378        let result = self.query_result_cache.get(key);
379
380        {
381            let mut stats = self.cache_stats.write().expect("lock poisoned");
382            if let Some(ref cached_result) = result {
383                stats.result_cache_hits += 1;
384                stats.time_saved_ms += cached_result.metadata.execution_time.as_millis() as u64;
385            } else {
386                stats.result_cache_misses += 1;
387            }
388            self.update_avg_lookup_time(&mut stats, start_time.elapsed());
389        }
390
391        result
392    }
393
394    /// Cache query result
395    pub fn cache_query_result(
396        &self,
397        key: QueryResultCacheKey,
398        result: CachedQueryResult,
399    ) -> Result<()> {
400        // Check size limits
401        if result.size_bytes > self.config.max_result_size {
402            return Ok(()); // Don't cache oversized results
403        }
404
405        self.query_result_cache.put(key, result)?;
406        Ok(())
407    }
408
409    /// Get cached BGP result
410    pub fn get_bgp_result(&self, key: &BgpCacheKey) -> Option<CachedBgpResult> {
411        let start_time = std::time::Instant::now();
412        let result = self.bgp_cache.get(key);
413
414        {
415            let mut stats = self.cache_stats.write().expect("lock poisoned");
416            if result.is_some() {
417                stats.bgp_cache_hits += 1;
418            } else {
419                stats.bgp_cache_misses += 1;
420            }
421            self.update_avg_lookup_time(&mut stats, start_time.elapsed());
422        }
423
424        result
425    }
426
427    /// Cache BGP result
428    pub fn cache_bgp_result(&self, key: BgpCacheKey, result: CachedBgpResult) -> Result<()> {
429        self.bgp_cache.put(key, result)?;
430        Ok(())
431    }
432
433    /// Create query plan cache key
434    pub fn create_plan_cache_key(
435        &self,
436        query: &Query,
437        schema_hash: u64,
438        optimization_level: OptimizationLevel,
439    ) -> QueryPlanCacheKey {
440        let query_hash = self.hash_query(query);
441        let config_hash = self.hash_config();
442
443        QueryPlanCacheKey {
444            query_hash,
445            schema_hash,
446            optimization_level,
447            config_hash,
448        }
449    }
450
451    /// Create query result cache key
452    pub fn create_result_cache_key(
453        &self,
454        query: &Query,
455        dataset_version: String,
456        parameter_bindings: HashMap<String, String>,
457    ) -> QueryResultCacheKey {
458        let query_signature = self.create_query_signature(query);
459
460        QueryResultCacheKey {
461            query_signature,
462            dataset_version,
463            parameter_bindings,
464        }
465    }
466
467    /// Create BGP cache key
468    pub fn create_bgp_cache_key(
469        &self,
470        pattern_hash: u64,
471        bindings: &HashMap<Variable, Term>,
472        graph_context: Option<&str>,
473    ) -> BgpCacheKey {
474        let bindings_hash = self.hash_bindings(bindings);
475
476        BgpCacheKey {
477            pattern_hash,
478            bindings_hash,
479            graph_context: graph_context.map(|s| s.to_string()),
480        }
481    }
482
483    /// Get cache statistics
484    pub fn get_statistics(&self) -> ArqCacheStatistics {
485        let stats = self.cache_stats.read().expect("lock poisoned");
486        stats.clone()
487    }
488
489    /// Warm caches based on query patterns
490    pub fn warm_caches(&self) -> Result<()> {
491        // Warm query plan cache
492        self.query_plan_cache.warm_cache()?;
493
494        // Warm result cache
495        self.query_result_cache.warm_cache()?;
496
497        // Warm BGP cache
498        self.bgp_cache.warm_cache()?;
499
500        Ok(())
501    }
502
503    /// Clear all caches
504    pub fn clear_all_caches(&self) {
505        self.query_plan_cache.clear();
506        self.query_result_cache.clear();
507        self.bgp_cache.clear();
508        self.statistics_cache.clear();
509
510        // Reset statistics
511        {
512            let mut stats = self.cache_stats.write().expect("lock poisoned");
513            *stats = ArqCacheStatistics::default();
514        }
515    }
516
517    /// Invalidate caches based on dataset changes
518    pub fn invalidate_on_dataset_change(&self, _changed_predicates: &[String]) -> Result<()> {
519        // Implementation would invalidate relevant cache entries
520        // For now, clear all caches as a conservative approach
521        self.clear_all_caches();
522        Ok(())
523    }
524
525    // Private helper methods
526    fn hash_query(&self, query: &Query) -> u64 {
527        // Create a canonical hash of the query
528        let mut hasher = std::collections::hash_map::DefaultHasher::new();
529        // This would hash the normalized query structure
530        format!("{query:?}").hash(&mut hasher);
531        hasher.finish()
532    }
533
534    fn hash_config(&self) -> u64 {
535        // Hash relevant configuration parameters
536        let mut hasher = std::collections::hash_map::DefaultHasher::new();
537        self.config
538            .query_similarity_threshold
539            .to_bits()
540            .hash(&mut hasher);
541        self.config.enable_cross_query_caching.hash(&mut hasher);
542        hasher.finish()
543    }
544
545    fn hash_bindings(&self, bindings: &HashMap<Variable, Term>) -> u64 {
546        let mut hasher = std::collections::hash_map::DefaultHasher::new();
547        // Sort bindings for consistent hashing
548        let mut sorted_bindings: Vec<_> = bindings.iter().collect();
549        sorted_bindings.sort_by_key(|(var, _)| var.as_str());
550
551        for (var, term) in sorted_bindings {
552            var.hash(&mut hasher);
553            format!("{term:?}").hash(&mut hasher);
554        }
555
556        hasher.finish()
557    }
558
559    fn create_query_signature(&self, query: &Query) -> QuerySignature {
560        // Extract canonical form and metadata
561        QuerySignature {
562            canonical_form: format!("{query:?}"), // Simplified
563            variables: query
564                .select_variables
565                .iter()
566                .map(|v| v.as_str().to_string())
567                .collect(),
568            operation_type: self.determine_operation_type(query),
569            complexity_score: self.calculate_complexity_score(query),
570        }
571    }
572
573    fn determine_operation_type(&self, _query: &Query) -> QueryOperationType {
574        // Determine query type based on query structure
575        QueryOperationType::Select // Simplified
576    }
577
578    fn calculate_complexity_score(&self, _query: &Query) -> u32 {
579        // Calculate query complexity score
580        100 // Simplified
581    }
582
583    fn is_result_cache_valid(&self, _key: &QueryResultCacheKey) -> bool {
584        // Check if cached result is still valid
585        // This would check dataset version, timestamps, etc.
586        true // Simplified
587    }
588
589    fn update_avg_lookup_time(&self, stats: &mut ArqCacheStatistics, lookup_time: Duration) {
590        let total_lookups = stats.plan_cache_hits
591            + stats.plan_cache_misses
592            + stats.result_cache_hits
593            + stats.result_cache_misses
594            + stats.bgp_cache_hits
595            + stats.bgp_cache_misses;
596
597        let lookup_time_us = lookup_time.as_micros() as f64;
598
599        if total_lookups == 1 {
600            stats.avg_lookup_time_us = lookup_time_us;
601        } else {
602            stats.avg_lookup_time_us = (stats.avg_lookup_time_us * (total_lookups - 1) as f64
603                + lookup_time_us)
604                / total_lookups as f64;
605        }
606
607        // Update efficiency score
608        let hit_rate = (stats.plan_cache_hits + stats.result_cache_hits + stats.bgp_cache_hits)
609            as f64
610            / total_lookups.max(1) as f64;
611        stats.efficiency_score =
612            hit_rate * 0.7 + (1.0 - stats.avg_lookup_time_us / 1000.0).max(0.0) * 0.3;
613    }
614}
615
616// Implement cache traits
617impl CacheKey for QueryPlanCacheKey {}
618impl CacheValue for CachedQueryPlan {}
619impl CacheKey for QueryResultCacheKey {}
620impl CacheValue for CachedQueryResult {}
621impl CacheKey for BgpCacheKey {}
622impl CacheValue for CachedBgpResult {}
623
624#[cfg(test)]
625mod tests {
626    use super::*;
627
628    #[test]
629    fn test_arq_cache_manager_creation() {
630        let config = ArqCacheConfig::default();
631        let cache_manager = ArqCacheManager::new(config);
632
633        let stats = cache_manager.get_statistics();
634        assert_eq!(stats.plan_cache_hits, 0);
635        assert_eq!(stats.result_cache_hits, 0);
636    }
637
638    #[test]
639    fn test_cache_key_creation() {
640        let config = ArqCacheConfig::default();
641        let _cache_manager = ArqCacheManager::new(config);
642
643        // Test would create actual query and test key creation
644        // This is a placeholder test structure
645    }
646}
oxirs_arq/cache_integration.rs

oxirs_arq/
cache_integration.rs
