Design Patterns MCP Server

{ "id": "blue-green-deployment", "name": "Blue-Green Deployment", "category": "Microservices", "description": "Maintains two identical production environments for zero-downtime deployments", "when_to_use": "Zero-downtime deployment\nQuick rollbacks\nProduction safety", "benefits": "Zero downtime\nQuick rollback\nProduction testing", "drawbacks": "Resource duplication\nCost overhead\nDatabase complexity", "use_cases": "Critical services\nHigh availability systems\nSafe deployments", "complexity": "Medium", "tags": [ "microservices", "deployment", "availability" ], "examples": { "typescript": { "language": "typescript", "code": "// Blue-Green Deployment: zero-downtime deployments\nclass LoadBalancer {\n private activeEnv: 'blue' | 'green' = 'blue';\n private envs = {\n blue: 'http://blue-env:3000',\n green: 'http://green-env:3000'\n };\n \n async route(request: Request): Promise<Response> {\n const targetUrl = this.envs[this.activeEnv];\n return fetch(targetUrl + request.url, {\n method: request.method,\n headers: request.headers\n });\n }\n \n async switchEnvironment() {\n const newEnv = this.activeEnv === 'blue' ? 'green' : 'blue';\n const healthy = await this.healthCheck(this.envs[newEnv]);\n \n if (healthy) {\n console.log('Switching to ' + newEnv);\n this.activeEnv = newEnv;\n return true;\n } else {\n throw new Error('New environment is not healthy');\n }\n }\n \n async healthCheck(url: string): Promise<boolean> {\n const response = await fetch(url + '/health');\n return response.ok;\n }\n}" } } }