MCP Vibe Coding Knowledge Graph

/** * CONTEXT: Cache coherency and distributed caching system for MCP server optimization * REASON: Ensure data consistency across multiple cache layers and distributed instances * CHANGE: Advanced cache synchronization, invalidation, and consistency management * PREVENTION: Stale data, cache inconsistencies, data corruption, distributed system conflicts */ import { EventEmitter } from 'events'; import { logger } from '../utils/logger.js'; import crypto from 'crypto'; export class CacheCoherence extends EventEmitter { constructor(config = {}) { super(); this.config = { // Coherence strategies coherenceStrategy: config.coherenceStrategy || 'strong', // 'strong', 'eventual', 'weak' // Invalidation settings invalidation: { enabled: config.invalidation?.enabled !== false, strategy: config.invalidation?.strategy || 'push', // 'push', 'pull', 'hybrid' batchSize: config.invalidation?.batchSize || 100, maxDelay: config.invalidation?.maxDelay || 5000, // 5 seconds retryAttempts: config.invalidation?.retryAttempts || 3, retryDelay: config.invalidation?.retryDelay || 1000, ...config.invalidation }, // Version control versioning: { enabled: config.versioning?.enabled !== false, strategy: config.versioning?.strategy || 'timestamp', // 'timestamp', 'vector', 'hybrid' conflictResolution: config.versioning?.conflictResolution || 'latest', // 'latest', 'manual', 'merge' ...config.versioning }, // Distributed settings distributed: { enabled: config.distributed?.enabled || false, nodeId: config.distributed?.nodeId || this.generateNodeId(), heartbeatInterval: config.distributed?.heartbeatInterval || 30000, syncInterval: config.distributed?.syncInterval || 60000, gossipInterval: config.distributed?.gossipInterval || 10000, ...config.distributed }, // Consistency settings consistency: { readConsistency: config.consistency?.readConsistency || 'strong', // 'strong', 'eventual', 'weak' writeConsistency: config.consistency?.writeConsistency || 'strong', quorumSize: config.consistency?.quorumSize || 2, replicationFactor: config.consistency?.replicationFactor || 3, ...config.consistency }, // Monitoring monitoring: { enabled: config.monitoring?.enabled !== false, metricsInterval: config.monitoring?.metricsInterval || 30000, coherenceChecks: config.monitoring?.coherenceChecks !== false, performanceTracking: config.monitoring?.performanceTracking !== false, ...config.monitoring } }; // Cache layer registry this.cacheLayers = new Map(); this.distributedNodes = new Map(); // Version tracking this.versionManager = new VersionManager(this.config.versioning); this.conflictResolver = new ConflictResolver(this.config.versioning); // Invalidation management this.invalidationManager = new InvalidationManager(this.config.invalidation); this.invalidationQueue = []; this.pendingInvalidations = new Map(); // Distributed coordination this.distributedCoordinator = new DistributedCoordinator(this.config.distributed); this.gossipProtocol = new GossipProtocol(this.config.distributed); // Consistency management this.consistencyManager = new ConsistencyManager(this.config.consistency); this.readQuorum = new Map(); this.writeQuorum = new Map(); // Performance metrics this.metrics = { coherence: { violations: 0, resolutions: 0, conflicts: 0, syncOperations: 0, avgSyncTime: 0, totalSyncTime: 0 }, invalidation: { sent: 0, received: 0, failed: 0, batched: 0, avgLatency: 0, totalLatency: 0 }, versioning: { conflicts: 0, resolutions: 0, merges: 0, rollbacks: 0 }, distributed: { nodes: 0, heartbeats: 0, gossipMessages: 0, syncEvents: 0, networkPartitions: 0 }, consistency: { strongReads: 0, eventualReads: 0, strongWrites: 0, eventualWrites: 0, quorumFailures: 0 } }; // State tracking this.state = { coherent: true, lastCoherenceCheck: Date.now(), activeInvalidations: 0, distributedMode: false, leaderNode: null, clusterHealth: 'healthy' }; // Monitoring intervals this.monitoringIntervals = []; this.initialized = false; } /** * Initialize cache coherence system */ async initialize() { if (this.initialized) return; try { logger.info('Initializing cache coherence system', { strategy: this.config.coherenceStrategy, distributed: this.config.distributed.enabled, nodeId: this.config.distributed.nodeId }); // Initialize sub-systems await this.versionManager.initialize(); await this.conflictResolver.initialize(); await this.invalidationManager.initialize(); await this.consistencyManager.initialize(); // Initialize distributed components if enabled if (this.config.distributed.enabled) { await this.distributedCoordinator.initialize(); await this.gossipProtocol.initialize(); this.state.distributedMode = true; } // Start monitoring if (this.config.monitoring.enabled) { this.startMonitoring(); } this.initialized = true; this.emit('initialized'); logger.info('Cache coherence system initialized successfully'); } catch (error) { logger.error('Failed to initialize cache coherence system:', error); throw error; } } /** * Register cache layer for coherence management */ registerCacheLayer(name, cacheLayer, config = {}) { const layerConfig = { name: name, layer: cacheLayer, priority: config.priority || 1, coherenceEnabled: config.coherenceEnabled !== false, invalidationEnabled: config.invalidationEnabled !== false, versioningEnabled: config.versioningEnabled !== false, consistency: config.consistency || this.config.consistency.readConsistency, replicationEnabled: config.replicationEnabled || false, ...config }; this.cacheLayers.set(name, layerConfig); // Setup event listeners if (cacheLayer.on) { cacheLayer.on('set', (event) => this.handleCacheSet(name, event)); cacheLayer.on('delete', (event) => this.handleCacheDelete(name, event)); cacheLayer.on('clear', (event) => this.handleCacheClear(name, event)); cacheLayer.on('evict', (event) => this.handleCacheEvict(name, event)); } logger.debug(`Cache layer registered for coherence: ${name}`, layerConfig); this.emit('layerRegistered', { name, config: layerConfig }); } /** * Unregister cache layer */ unregisterCacheLayer(name) { if (this.cacheLayers.has(name)) { this.cacheLayers.delete(name); logger.debug(`Cache layer unregistered: ${name}`); this.emit('layerUnregistered', { name }); } } /** * Start monitoring and maintenance tasks */ startMonitoring() { // Coherence checks const coherenceCheckInterval = setInterval(() => { if (this.config.monitoring.coherenceChecks) { this.performCoherenceCheck().catch(error => { logger.error('Coherence check failed:', error); }); } }, this.config.monitoring.metricsInterval); // Invalidation processing const invalidationInterval = setInterval(() => { this.processInvalidationQueue().catch(error => { logger.error('Invalidation processing failed:', error); }); }, 1000); // Process every second // Distributed synchronization if (this.config.distributed.enabled) { const syncInterval = setInterval(() => { this.performDistributedSync().catch(error => { logger.error('Distributed sync failed:', error); }); }, this.config.distributed.syncInterval); this.monitoringIntervals.push(syncInterval); } // Metrics collection const metricsInterval = setInterval(() => { this.collectMetrics(); }, this.config.monitoring.metricsInterval); this.monitoringIntervals.push( coherenceCheckInterval, invalidationInterval, metricsInterval ); logger.debug('Cache coherence monitoring started'); } /** * Handle cache set operation */ async handleCacheSet(layerName, event) { try { const { key, value, metadata = {} } = event; // Generate version for the entry const version = await this.versionManager.generateVersion(key, layerName); // Create cache entry with coherence metadata const coherenceMetadata = { ...metadata, version: version, timestamp: Date.now(), sourceLayer: layerName, nodeId: this.config.distributed.nodeId, coherenceStrategy: this.config.coherenceStrategy }; // Propagate to other layers based on consistency strategy if (this.config.consistency.writeConsistency === 'strong') { await this.propagateStrongWrite(key, value, coherenceMetadata); } else if (this.config.consistency.writeConsistency === 'eventual') { await this.propagateEventualWrite(key, value, coherenceMetadata); } // Queue invalidation for distributed nodes if (this.config.distributed.enabled) { this.queueInvalidation({ type: 'set', key: key, version: version, sourceNode: this.config.distributed.nodeId, timestamp: Date.now() }); } this.emit('coherenceSet', { layer: layerName, key: key, version: version, strategy: this.config.coherenceStrategy }); } catch (error) { logger.error('Cache set coherence handling failed:', error); this.metrics.coherence.violations++; } } /** * Handle cache delete operation */ async handleCacheDelete(layerName, event) { try { const { key, metadata = {} } = event; // Generate version for deletion const version = await this.versionManager.generateVersion(key, layerName); // Propagate deletion to other layers await this.propagateDelete(key, version, layerName); // Queue invalidation for distributed nodes if (this.config.distributed.enabled) { this.queueInvalidation({ type: 'delete', key: key, version: version, sourceNode: this.config.distributed.nodeId, timestamp: Date.now() }); } this.emit('coherenceDelete', { layer: layerName, key: key, version: version }); } catch (error) { logger.error('Cache delete coherence handling failed:', error); this.metrics.coherence.violations++; } } /** * Handle cache clear operation */ async handleCacheClear(layerName, event) { try { const { pattern = null } = event; // Generate version for clear operation const version = await this.versionManager.generateVersion('__clear__', layerName); // Propagate clear to other layers await this.propagateClear(pattern, version, layerName); // Queue invalidation for distributed nodes if (this.config.distributed.enabled) { this.queueInvalidation({ type: 'clear', pattern: pattern, version: version, sourceNode: this.config.distributed.nodeId, timestamp: Date.now() }); } this.emit('coherenceClear', { layer: layerName, pattern: pattern, version: version }); } catch (error) { logger.error('Cache clear coherence handling failed:', error); this.metrics.coherence.violations++; } } /** * Handle cache eviction */ async handleCacheEvict(layerName, event) { // Evictions are typically not propagated for coherence // unless specifically configured this.emit('coherenceEvict', { layer: layerName, ...event }); } /** * Propagate strong consistency write */ async propagateStrongWrite(key, value, metadata) { const propagationPromises = []; for (const [layerName, layerConfig] of this.cacheLayers) { if (layerName === metadata.sourceLayer) continue; if (!layerConfig.coherenceEnabled) continue; propagationPromises.push( this.propagateToLayer(layerConfig, 'set', key, value, metadata) ); } // Wait for all propagations to complete (strong consistency) const results = await Promise.allSettled(propagationPromises); // Check for failures const failures = results.filter(result => result.status === 'rejected'); if (failures.length > 0) { logger.warn(`Strong write propagation had ${failures.length} failures`, { key: key, failures: failures.map(f => f.reason.message) }); this.metrics.coherence.violations++; } this.metrics.consistency.strongWrites++; } /** * Propagate eventual consistency write */ async propagateEventualWrite(key, value, metadata) { // Fire and forget for eventual consistency for (const [layerName, layerConfig] of this.cacheLayers) { if (layerName === metadata.sourceLayer) continue; if (!layerConfig.coherenceEnabled) continue; this.propagateToLayer(layerConfig, 'set', key, value, metadata) .catch(error => { logger.debug(`Eventual write propagation failed for layer ${layerName}:`, error.message); this.metrics.coherence.violations++; }); } this.metrics.consistency.eventualWrites++; } /** * Propagate delete operation */ async propagateDelete(key, version, sourceLayer) { const propagationPromises = []; for (const [layerName, layerConfig] of this.cacheLayers) { if (layerName === sourceLayer) continue; if (!layerConfig.coherenceEnabled) continue; propagationPromises.push( this.propagateToLayer(layerConfig, 'delete', key, null, { version }) ); } await Promise.allSettled(propagationPromises); } /** * Propagate clear operation */ async propagateClear(pattern, version, sourceLayer) { const propagationPromises = []; for (const [layerName, layerConfig] of this.cacheLayers) { if (layerName === sourceLayer) continue; if (!layerConfig.coherenceEnabled) continue; propagationPromises.push( this.propagateToLayer(layerConfig, 'clear', null, null, { pattern, version }) ); } await Promise.allSettled(propagationPromises); } /** * Propagate operation to specific layer */ async propagateToLayer(layerConfig, operation, key, value, metadata) { const startTime = Date.now(); try { const layer = layerConfig.layer; switch (operation) { case 'set': if (layer.set) { await layer.set(key, value, { ...metadata, coherence: true, sourceLayer: metadata.sourceLayer }); } break; case 'delete': if (layer.delete) { await layer.delete(key, { coherence: true, version: metadata.version }); } break; case 'clear': if (layer.clear) { await layer.clear(metadata.pattern, { coherence: true, version: metadata.version }); } break; } const duration = Date.now() - startTime; this.metrics.coherence.totalSyncTime += duration; this.metrics.coherence.syncOperations++; this.metrics.coherence.avgSyncTime = this.metrics.coherence.totalSyncTime / this.metrics.coherence.syncOperations; } catch (error) { logger.error(`Propagation to layer ${layerConfig.name} failed:`, error); throw error; } } /** * Queue invalidation for distributed nodes */ queueInvalidation(invalidation) { this.invalidationQueue.push({ ...invalidation, id: this.generateInvalidationId(), queuedAt: Date.now(), attempts: 0 }); this.state.activeInvalidations++; } /** * Process invalidation queue */ async processInvalidationQueue() { if (this.invalidationQueue.length === 0) return; const batchSize = this.config.invalidation.batchSize; const batch = this.invalidationQueue.splice(0, batchSize); for (const invalidation of batch) { try { await this.sendInvalidation(invalidation); this.metrics.invalidation.sent++; this.state.activeInvalidations--; } catch (error) { logger.error('Invalidation failed:', error); this.metrics.invalidation.failed++; // Retry logic if (invalidation.attempts < this.config.invalidation.retryAttempts) { invalidation.attempts++; setTimeout(() => { this.invalidationQueue.push(invalidation); }, this.config.invalidation.retryDelay * invalidation.attempts); } else { this.state.activeInvalidations--; } } } if (batch.length > 1) { this.metrics.invalidation.batched++; } } /** * Send invalidation to distributed nodes */ async sendInvalidation(invalidation) { if (!this.config.distributed.enabled) return; const startTime = Date.now(); try { await this.gossipProtocol.broadcast({ type: 'invalidation', data: invalidation }); const latency = Date.now() - startTime; this.metrics.invalidation.totalLatency += latency; this.metrics.invalidation.avgLatency = this.metrics.invalidation.totalLatency / this.metrics.invalidation.sent; } catch (error) { throw new Error(`Invalidation broadcast failed: ${error.message}`); } } /** * Receive invalidation from remote node */ async receiveInvalidation(invalidation) { try { // Check if we've already processed this invalidation if (this.pendingInvalidations.has(invalidation.id)) { return; } this.pendingInvalidations.set(invalidation.id, invalidation); // Apply invalidation based on type switch (invalidation.type) { case 'set': await this.handleRemoteSet(invalidation); break; case 'delete': await this.handleRemoteDelete(invalidation); break; case 'clear': await this.handleRemoteClear(invalidation); break; } this.metrics.invalidation.received++; // Clean up processed invalidation setTimeout(() => { this.pendingInvalidations.delete(invalidation.id); }, 60000); // Keep for 1 minute to prevent duplicates } catch (error) { logger.error('Remote invalidation processing failed:', error); } } /** * Handle remote set invalidation */ async handleRemoteSet(invalidation) { // Check version conflicts const conflict = await this.versionManager.checkConflict( invalidation.key, invalidation.version ); if (conflict) { const resolution = await this.conflictResolver.resolve(conflict); if (resolution.action === 'reject') { return; // Don't apply the change } } // Invalidate local caches for this key await this.invalidateLocalKey(invalidation.key); } /** * Handle remote delete invalidation */ async handleRemoteDelete(invalidation) { await this.invalidateLocalKey(invalidation.key); } /** * Handle remote clear invalidation */ async handleRemoteClear(invalidation) { const pattern = invalidation.pattern; for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.invalidationEnabled) continue; try { const layer = layerConfig.layer; if (layer.clear) { await layer.clear(pattern, { coherence: true, remote: true }); } } catch (error) { logger.error(`Remote clear failed for layer ${layerName}:`, error); } } } /** * Invalidate key in local cache layers */ async invalidateLocalKey(key) { const invalidationPromises = []; for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.invalidationEnabled) continue; invalidationPromises.push((async () => { try { const layer = layerConfig.layer; if (layer.delete) { await layer.delete(key, { coherence: true, remote: true }); } } catch (error) { logger.error(`Local invalidation failed for layer ${layerName}:`, error); } })()); } await Promise.allSettled(invalidationPromises); } /** * Perform coherence check across all layers */ async performCoherenceCheck() { const startTime = Date.now(); try { const violations = []; // Sample keys from each layer for comparison const sampleKeys = await this.getSampleKeys(); for (const key of sampleKeys) { const versions = await this.getKeyVersionsFromAllLayers(key); const coherenceResult = this.checkKeyCoherence(key, versions); if (!coherenceResult.coherent) { violations.push(coherenceResult); } } // Update coherence state this.state.coherent = violations.length === 0; this.state.lastCoherenceCheck = Date.now(); if (violations.length > 0) { this.metrics.coherence.violations += violations.length; logger.warn(`Coherence violations detected: ${violations.length}`); this.emit('coherenceViolation', { violations: violations, count: violations.length }); // Attempt to resolve violations await this.resolveCoherenceViolations(violations); } const duration = Date.now() - startTime; this.emit('coherenceCheck', { coherent: this.state.coherent, violations: violations.length, sampleSize: sampleKeys.length, duration: duration }); } catch (error) { logger.error('Coherence check failed:', error); } } /** * Get sample keys from all cache layers */ async getSampleKeys() { const allKeys = new Set(); for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.coherenceEnabled) continue; try { const layer = layerConfig.layer; if (layer.keys) { const keys = await layer.keys(); keys.slice(0, 10).forEach(key => allKeys.add(key)); // Sample 10 keys per layer } } catch (error) { logger.debug(`Failed to get keys from layer ${layerName}:`, error.message); } } return Array.from(allKeys); } /** * Get key versions from all layers */ async getKeyVersionsFromAllLayers(key) { const versions = new Map(); for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.coherenceEnabled) continue; try { const layer = layerConfig.layer; const version = await this.getKeyVersion(layer, key); if (version) { versions.set(layerName, version); } } catch (error) { logger.debug(`Failed to get version for key ${key} from layer ${layerName}:`, error.message); } } return versions; } /** * Get version for a specific key from a layer */ async getKeyVersion(layer, key) { if (layer.getMetadata) { const metadata = await layer.getMetadata(key); return metadata?.version; } // Fallback: try to get the value and extract version if (layer.get) { const value = await layer.get(key); return value?.metadata?.version || value?.version; } return null; } /** * Check coherence for a specific key */ checkKeyCoherence(key, versions) { if (versions.size === 0) { return { coherent: true, key: key }; } if (versions.size === 1) { return { coherent: true, key: key }; } // Check if all versions are the same const versionValues = Array.from(versions.values()); const firstVersion = versionValues[0]; const allSame = versionValues.every(version => this.versionManager.compareVersions(version, firstVersion) === 0 ); return { coherent: allSame, key: key, versions: Object.fromEntries(versions), conflicts: allSame ? [] : this.identifyVersionConflicts(versions) }; } /** * Identify version conflicts */ identifyVersionConflicts(versions) { const conflicts = []; const versionArray = Array.from(versions.entries()); for (let i = 0; i < versionArray.length; i++) { for (let j = i + 1; j < versionArray.length; j++) { const [layer1, version1] = versionArray[i]; const [layer2, version2] = versionArray[j]; const comparison = this.versionManager.compareVersions(version1, version2); if (comparison !== 0) { conflicts.push({ layer1: layer1, version1: version1, layer2: layer2, version2: version2, comparison: comparison }); } } } return conflicts; } /** * Resolve coherence violations */ async resolveCoherenceViolations(violations) { for (const violation of violations) { try { const resolution = await this.conflictResolver.resolveViolation(violation); await this.applyResolution(violation.key, resolution); this.metrics.coherence.resolutions++; } catch (error) { logger.error(`Failed to resolve coherence violation for key ${violation.key}:`, error); } } } /** * Apply coherence violation resolution */ async applyResolution(key, resolution) { switch (resolution.action) { case 'use_latest': await this.propagateLatestVersion(key, resolution.version, resolution.sourceLayer); break; case 'merge': await this.mergeVersions(key, resolution.mergedValue, resolution.mergedVersion); break; case 'remove': await this.removeInconsistentKey(key); break; default: logger.warn(`Unknown resolution action: ${resolution.action}`); } } /** * Propagate latest version to all layers */ async propagateLatestVersion(key, version, sourceLayer) { const sourceLayerConfig = this.cacheLayers.get(sourceLayer); if (!sourceLayerConfig) return; // Get the value from source layer const value = await sourceLayerConfig.layer.get(key); if (!value) return; // Propagate to other layers for (const [layerName, layerConfig] of this.cacheLayers) { if (layerName === sourceLayer) continue; if (!layerConfig.coherenceEnabled) continue; try { await layerConfig.layer.set(key, value, { version: version, coherenceResolution: true }); } catch (error) { logger.error(`Failed to propagate latest version to layer ${layerName}:`, error); } } } /** * Merge conflicting versions */ async mergeVersions(key, mergedValue, mergedVersion) { for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.coherenceEnabled) continue; try { await layerConfig.layer.set(key, mergedValue, { version: mergedVersion, coherenceMerge: true }); } catch (error) { logger.error(`Failed to apply merged version to layer ${layerName}:`, error); } } this.metrics.versioning.merges++; } /** * Remove inconsistent key from all layers */ async removeInconsistentKey(key) { for (const [layerName, layerConfig] of this.cacheLayers) { if (!layerConfig.coherenceEnabled) continue; try { await layerConfig.layer.delete(key, { coherenceRemoval: true }); } catch (error) { logger.error(`Failed to remove inconsistent key from layer ${layerName}:`, error); } } } /** * Perform distributed synchronization */ async performDistributedSync() { if (!this.state.distributedMode) return; try { await this.distributedCoordinator.synchronize(); this.metrics.distributed.syncEvents++; } catch (error) { logger.error('Distributed synchronization failed:', error); } } /** * Collect performance metrics */ collectMetrics() { // Update distributed metrics if (this.state.distributedMode) { this.metrics.distributed.nodes = this.distributedNodes.size; } // Emit metrics event this.emit('metricsCollected', this.metrics); } /** * Generate node ID */ generateNodeId() { return crypto.randomBytes(8).toString('hex'); } /** * Generate invalidation ID */ generateInvalidationId() { return crypto.randomBytes(16).toString('hex'); } /** * Get coherence status */ getCoherenceStatus() { return { timestamp: Date.now(), coherent: this.state.coherent, lastCheck: this.state.lastCoherenceCheck, distributedMode: this.state.distributedMode, activeInvalidations: this.state.activeInvalidations, clusterHealth: this.state.clusterHealth, metrics: this.metrics, layers: Array.from(this.cacheLayers.keys()), nodes: Array.from(this.distributedNodes.keys()) }; } /** * Force coherence check */ async forceCoherenceCheck() { logger.info('Forcing coherence check'); await this.performCoherenceCheck(); return this.getCoherenceStatus(); } /** * Shutdown cache coherence system */ async shutdown() { try { logger.info('Shutting down cache coherence system'); // Clear monitoring intervals for (const interval of this.monitoringIntervals) { clearInterval(interval); } // Shutdown sub-systems await this.versionManager.shutdown(); await this.conflictResolver.shutdown(); await this.invalidationManager.shutdown(); await this.consistencyManager.shutdown(); if (this.state.distributedMode) { await this.distributedCoordinator.shutdown(); await this.gossipProtocol.shutdown(); } // Clear data structures this.cacheLayers.clear(); this.distributedNodes.clear(); this.invalidationQueue.length = 0; this.pendingInvalidations.clear(); this.initialized = false; this.emit('shutdown'); logger.info('Cache coherence system shutdown completed'); } catch (error) { logger.error('Error during cache coherence shutdown:', error); throw error; } } } /** * Version Manager */ class VersionManager { constructor(config) { this.config = config; this.versions = new Map(); this.vectorClocks = new Map(); } async initialize() { logger.debug('Version manager initialized'); } async generateVersion(key, sourceLayer) { if (this.config.strategy === 'timestamp') { return Date.now(); } else if (this.config.strategy === 'vector') { return this.generateVectorClock(key, sourceLayer); } return Date.now(); // Fallback } generateVectorClock(key, sourceLayer) { if (!this.vectorClocks.has(key)) { this.vectorClocks.set(key, new Map()); } const clock = this.vectorClocks.get(key); const currentVersion = clock.get(sourceLayer) || 0; clock.set(sourceLayer, currentVersion + 1); return Object.fromEntries(clock); } compareVersions(version1, version2) { if (typeof version1 === 'number' && typeof version2 === 'number') { return version1 - version2; } // Vector clock comparison if (typeof version1 === 'object' && typeof version2 === 'object') { return this.compareVectorClocks(version1, version2); } return 0; } compareVectorClocks(clock1, clock2) { const keys1 = Object.keys(clock1); const keys2 = Object.keys(clock2); const allKeys = new Set([...keys1, ...keys2]); let relation = 0; // 0: equal, -1: clock1 < clock2, 1: clock1 > clock2, NaN: concurrent for (const key of allKeys) { const val1 = clock1[key] || 0; const val2 = clock2[key] || 0; if (val1 < val2) { if (relation === 1) return NaN; // Concurrent relation = -1; } else if (val1 > val2) { if (relation === -1) return NaN; // Concurrent relation = 1; } } return relation; } async checkConflict(key, version) { // Implement conflict detection logic return null; } async shutdown() { this.versions.clear(); this.vectorClocks.clear(); logger.debug('Version manager shutdown'); } } /** * Conflict Resolver */ class ConflictResolver { constructor(config) { this.config = config; } async initialize() { logger.debug('Conflict resolver initialized'); } async resolve(conflict) { switch (this.config.conflictResolution) { case 'latest': return this.resolveLatest(conflict); case 'manual': return this.resolveManual(conflict); case 'merge': return this.resolveMerge(conflict); default: return this.resolveLatest(conflict); } } async resolveViolation(violation) { // Find the latest version let latestVersion = null; let latestLayer = null; for (const [layer, version] of Object.entries(violation.versions)) { if (!latestVersion || version > latestVersion) { latestVersion = version; latestLayer = layer; } } return { action: 'use_latest', version: latestVersion, sourceLayer: latestLayer }; } resolveLatest(conflict) { return { action: 'use_latest' }; } resolveManual(conflict) { return { action: 'manual_review' }; } resolveMerge(conflict) { return { action: 'merge' }; } async shutdown() { logger.debug('Conflict resolver shutdown'); } } /** * Invalidation Manager */ class InvalidationManager { constructor(config) { this.config = config; } async initialize() { logger.debug('Invalidation manager initialized'); } async shutdown() { logger.debug('Invalidation manager shutdown'); } } /** * Distributed Coordinator */ class DistributedCoordinator { constructor(config) { this.config = config; } async initialize() { logger.debug('Distributed coordinator initialized'); } async synchronize() { // Implement distributed synchronization } async shutdown() { logger.debug('Distributed coordinator shutdown'); } } /** * Gossip Protocol */ class GossipProtocol { constructor(config) { this.config = config; } async initialize() { logger.debug('Gossip protocol initialized'); } async broadcast(message) { // Implement gossip broadcast } async shutdown() { logger.debug('Gossip protocol shutdown'); } } /** * Consistency Manager */ class ConsistencyManager { constructor(config) { this.config = config; } async initialize() { logger.debug('Consistency manager initialized'); } async shutdown() { logger.debug('Consistency manager shutdown'); } } export default CacheCoherence;