Design Patterns MCP Server

{ "id": "connection-pool", "name": "Connection Pool", "category": "Data Access", "description": "Maintains cache of database connections to improve performance and resource utilization", "when_to_use": "High-traffic applications\nPerformance optimization\nResource management", "benefits": "Performance improvement\nResource efficiency\nConnection reuse", "drawbacks": "Configuration complexity\nMemory overhead\nConnection leaks", "use_cases": "Web applications\nEnterprise systems\nHigh-concurrency applications", "complexity": "Medium", "tags": [ "data-access", "performance", "pooling" ], "examples": { "typescript": { "language": "typescript", "code": "// Connection Pool: reuse database connections\nclass ConnectionPool {\n private available: Connection[] = [];\n private inUse: Set<Connection> = new Set();\n \n constructor(\n private maxSize: number,\n private createConnection: () => Connection\n ) {}\n \n async acquire(): Promise<Connection> {\n if (this.available.length > 0) {\n const conn = this.available.pop()!;\n this.inUse.add(conn);\n return conn;\n }\n \n if (this.inUse.size < this.maxSize) {\n const conn = this.createConnection();\n this.inUse.add(conn);\n return conn;\n }\n \n await this.waitForAvailableConnection();\n return this.acquire();\n }\n \n release(conn: Connection) {\n this.inUse.delete(conn);\n this.available.push(conn);\n }\n \n private async waitForAvailableConnection() {\n await new Promise(resolve => setTimeout(resolve, 100));\n }\n}\n\nconst pool = new ConnectionPool(10, () => createDbConnection());\nconst conn = await pool.acquire();\nawait conn.query('SELECT * FROM users');\npool.release(conn);" } } }