Local Search MCP Server

import { DatabaseSchema } from './DatabaseSchema.js'; import { VectorIndex } from './VectorIndex.js'; import { RecommendationRepository } from './RecommendationRepository.js'; import { log } from './Logger.js'; /** * Service locator pattern to manage shared instances and avoid inefficient recreation * Addresses code review comment about creating new instances for each operation */ export class ServiceLocator { private static instance: ServiceLocator; private databaseSchema: DatabaseSchema | null = null; private vectorIndex: VectorIndex | null = null; private recommendationRepository: RecommendationRepository | null = null; private constructor() { log.debug('ServiceLocator initialized'); } static getInstance(): ServiceLocator { if (!ServiceLocator.instance) { ServiceLocator.instance = new ServiceLocator(); } return ServiceLocator.instance; } /** * Get shared DatabaseSchema instance * Creates once and reuses for efficiency */ getDatabaseSchema(): DatabaseSchema { if (!this.databaseSchema) { this.databaseSchema = new DatabaseSchema(); log.debug('DatabaseSchema instance created and cached'); } return this.databaseSchema; } /** * Get shared VectorIndex instance * Creates once and reuses for efficiency */ getVectorIndex(): VectorIndex { if (!this.vectorIndex) { const schema = this.getDatabaseSchema(); const recommendationRepo = this.getRecommendationRepository(); this.vectorIndex = new VectorIndex(schema, recommendationRepo); log.debug('VectorIndex instance created and cached'); } return this.vectorIndex; } /** * Get shared RecommendationRepository instance * Creates once and reuses for efficiency */ getRecommendationRepository(): RecommendationRepository { if (!this.recommendationRepository) { const schema = this.getDatabaseSchema(); this.recommendationRepository = new RecommendationRepository(schema.getDatabase()); log.debug('RecommendationRepository instance created and cached'); } return this.recommendationRepository; } /** * Clean up all instances * Call this when shutting down the application */ dispose(): void { try { if (this.vectorIndex) { this.vectorIndex.close(); this.vectorIndex = null; } if (this.databaseSchema) { this.databaseSchema.close(); this.databaseSchema = null; } this.recommendationRepository = null; log.info('ServiceLocator disposed all instances'); } catch (error: any) { log.error('Error disposing ServiceLocator instances', error); } } /** * Reset all instances (useful for testing or configuration changes) */ reset(): void { this.dispose(); log.info('ServiceLocator reset - instances will be recreated on next access'); } /** * Get statistics about cached instances */ getInstanceStats(): { databaseSchemaCreated: boolean; vectorIndexCreated: boolean; recommendationRepositoryCreated: boolean; } { return { databaseSchemaCreated: this.databaseSchema !== null, vectorIndexCreated: this.vectorIndex !== null, recommendationRepositoryCreated: this.recommendationRepository !== null }; } }