├── .gitignore ├── README.md ├── assets ├── .DS_Store └── img │ ├── di-container-diagram.svg │ ├── plugin-system-diagram.svg │ ├── rate-limiter-diagram.svg │ ├── retry-mechanism-diagram.svg │ └── stream-transformer-diagram.svg ├── examples ├── AdaptiveRateLimiter.js ├── DependencyInjectionContainer.js ├── PluginManager.js ├── RetryMechanism.js └── StreamTransformer.js ├── package-lock.json └── package.json /.gitignore: -------------------------------------------------------------------------------- 1 | ### Node template 2 | # Logs 3 | logs 4 | *.log 5 | npm-debug.log* 6 | yarn-debug.log* 7 | yarn-error.log* 8 | lerna-debug.log* 9 | .pnpm-debug.log* 10 | .idea 11 | 12 | # Diagnostic reports (https://nodejs.org/api/report.html) 13 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 14 | 15 | # Runtime data 16 | pids 17 | *.pid 18 | *.seed 19 | *.pid.lock 20 | 21 | # Directory for instrumented libs generated by jscoverage/JSCover 22 | lib-cov 23 | 24 | # Coverage directory used by tools like istanbul 25 | coverage 26 | *.lcov 27 | 28 | # nyc test coverage 29 | .nyc_output 30 | 31 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 32 | .grunt 33 | 34 | # Bower dependency directory (https://bower.io/) 35 | bower_components 36 | 37 | # node-waf configuration 38 | .lock-wscript 39 | 40 | # Compiled binary addons (https://nodejs.org/api/addons.html) 41 | build/Release 42 | 43 | # Dependency directories 44 | node_modules/ 45 | jspm_packages/ 46 | 47 | # Snowpack dependency directory (https://snowpack.dev/) 48 | web_modules/ 49 | 50 | # TypeScript cache 51 | *.tsbuildinfo 52 | 53 | # Optional npm cache directory 54 | .npm 55 | 56 | # Optional eslint cache 57 | .eslintcache 58 | 59 | # Optional stylelint cache 60 | .stylelintcache 61 | 62 | # Microbundle cache 63 | .rpt2_cache/ 64 | .rts2_cache_cjs/ 65 | .rts2_cache_es/ 66 | .rts2_cache_umd/ 67 | 68 | # Optional REPL history 69 | .node_repl_history 70 | 71 | # Output of 'npm pack' 72 | *.tgz 73 | 74 | # Yarn Integrity file 75 | .yarn-integrity 76 | 77 | # dotenv environment variable files 78 | .env 79 | .env.development.local 80 | .env.test.local 81 | .env.production.local 82 | .env.local 83 | 84 | # parcel-bundler cache (https://parceljs.org/) 85 | .cache 86 | .parcel-cache 87 | 88 | # Next.js build output 89 | .next 90 | out 91 | 92 | # Nuxt.js build / generate output 93 | .nuxt 94 | dist 95 | 96 | # Gatsby files 97 | .cache/ 98 | # Comment in the public line in if your project uses Gatsby and not Next.js 99 | # https://nextjs.org/blog/next-9-1#public-directory-support 100 | # public 101 | 102 | # vuepress build output 103 | .vuepress/dist 104 | 105 | # vuepress v2.x temp and cache directory 106 | .temp 107 | .cache 108 | 109 | # Docusaurus cache and generated files 110 | .docusaurus 111 | 112 | # Serverless directories 113 | .serverless/ 114 | 115 | # FuseBox cache 116 | .fusebox/ 117 | 118 | # DynamoDB Local files 119 | .dynamodb/ 120 | 121 | # TernJS port file 122 | .tern-port 123 | 124 | # Stores VSCode versions used for testing VSCode extensions 125 | .vscode-test 126 | 127 | # yarn v2 128 | .yarn/cache 129 | .yarn/unplugged 130 | .yarn/build-state.yml 131 | .yarn/install-state.gz 132 | .pnp.* 133 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | # Node.js Advanced Patterns 3 | 4 | ## Table of Contents 5 | 6 | - **[Dependency Injection Container](./examples/DependencyInjectionContainer.js)** 7 | ![Dependency Injection Container](./assets/img/di-container-diagram.svg) 8 | - Dynamic dependency management 9 | - Service registration and resolution 10 | - Supports complex dependency graphs 11 | - [Full Article (Medium)](https://v-checha.medium.com/node-js-advanced-patterns-dependency-injection-container-45938e88e873) 12 | 13 | ```bash 14 | npm run example:4 15 | ``` 16 | 17 | - Circuit Breaker Pattern 18 | - Prevents cascading failures 19 | - Automatic recovery mechanism 20 | - Configurable failure thresholds 21 | - Different circuit states (CLOSED, OPEN, HALF_OPEN) 22 | 23 | 24 | - **[Streaming Transformer](./examples/StreamTransformer.js)** 25 | ![Stream Transformer](./assets/img/stream-transformer-diagram.svg) 26 | - Advanced stream processing 27 | - Composable transformation streams 28 | - Supports async transformations 29 | - Easy stream composition 30 | - [Full Article (Medium)](https://v-checha.medium.com/node-js-advanced-patterns-stream-transformer-1b1f3b1b3b3d) 31 | 32 | ```bash 33 | npm run example:1 34 | ``` 35 | 36 | - **[Robust Retry Mechanism](./examples/RetryMechanism.js)** 37 | ![Retry Mechanism](./assets/img/retry-mechanism-diagram.svg) 38 | - Exponential backoff with jitter 39 | - Configurable retry strategies 40 | - Prevents thundering herd problem 41 | - Intelligent delay calculation 42 | - [Full Article (Medium)](https://v-checha.medium.com/node-js-advanced-patterns-robust-retry-mechanism-1b1f3b1b3b3d) 43 | 44 | ```bash 45 | npm run example:2 46 | ``` 47 | 48 | 49 | - **[Adaptive Rate Limiter](./examples/AdaptiveRateLimiter.js)** 50 | ![Adaptive Rate Limiter](./assets/img/rate-limiter-diagram.svg) 51 | - Dynamic request throttling 52 | - Adaptive threshold management 53 | - Prevents system overload 54 | - Flexible configuration 55 | - [Full Article (Medium)](https://medium.com/@v-checha/node-js-advanced-patterns-adaptive-rate-limiter-aa8221177162) 56 | 57 | ```bash 58 | npm run example:3 59 | ``` 60 | 61 | - **[Dynamic Plugin System](./examples/PluginManager.js)** 62 | ![Dynamic Plugin System](./assets/img/plugin-system-diagram.svg) 63 | - Runtime plugin loading 64 | - Hot-reload capabilities 65 | - Safe plugin execution 66 | - Error-tolerant plugin management 67 | - [Full Article (Medium)](https://v-checha.medium.com/node-js-advanced-patterns-plugin-manager-44adb72aa6bb) 68 | ```bash 69 | npm run example:5 70 | ``` 71 | -------------------------------------------------------------------------------- /assets/.DS_Store: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/v-checha/node-js-advanced-patterns/38341dbb0ef591ee6e5aabdb3cc83161c92abae5/assets/.DS_Store -------------------------------------------------------------------------------- /assets/img/di-container-diagram.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Dependency Injection Container Pattern 8 | 9 | 10 | 11 | 12 | DI Container 13 | 14 | 15 | 16 | Service Registry 17 | 18 | 19 | 20 | logger: LoggerService 21 | 22 | 23 | db: DatabaseService 24 | 25 | 26 | auth: AuthService 27 | 28 | 29 | cache: CacheService 30 | 31 | 32 | 33 | Service Factory 34 | 35 | 36 | 37 | createService(name, factory) 38 | Returns new instance 39 | 40 | 41 | resolveService(name) 42 | Returns existing instance 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | Service Registry 72 | 73 | 74 | Service Factory 75 | 76 | 77 | 78 | 79 | Active Service 80 | 81 | 82 | 83 | register() 84 | resolve() 85 | createService() 86 | 87 | -------------------------------------------------------------------------------- /assets/img/plugin-system-diagram.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Dynamic Plugin System Pattern 8 | 9 | 10 | 11 | 12 | Core Application 13 | 14 | 15 | 16 | Plugin Manager 17 | Load | Unload | Reload | Execute 18 | Hot Reload Support 19 | 20 | 21 | 22 | Plugin Registry 23 | 24 | 25 | 26 | 27 | Plugin A 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | Plugin B 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | Plugin C 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | Plugin Manager 57 | 58 | 59 | Registry 60 | 61 | 62 | Active Plugins 63 | 64 | -------------------------------------------------------------------------------- /assets/img/rate-limiter-diagram.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Adaptive Rate Limiter Pattern 8 | 9 | 10 | 11 | 12 | Incoming Requests 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | Adaptive Rate Limiter 24 | 25 | 26 | 27 | 28 | Adaptive Threshold (80%) 29 | 30 | 31 | 32 | Time Window 33 | 34 | 35 | 36 | Request Count: 8/10 37 | 38 | 39 | 40 | Service 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | Pending Requests 72 | 73 | 74 | Processed Requests 75 | 76 | 77 | Rate Limiter Window 78 | 79 | -------------------------------------------------------------------------------- /assets/img/retry-mechanism-diagram.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Robust Retry Mechanism Pattern 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 0ms 16 | 17 | 18 | Time 19 | 20 | 21 | 22 | 23 | Initial 24 | 25 | 26 | 27 | 28 | Retry 1 29 | 30 | 31 | 32 | 33 | Retry 2 34 | 35 | 36 | 37 | 38 | Retry 3 39 | 40 | 41 | 42 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 53 | 54 | 1s 55 | 2s 56 | 4s 57 | 58 | 59 | 60 | Initial Request 61 | 62 | 63 | Jitter Window 64 | 65 | 66 | Backoff Curve 67 | 68 | 69 | 70 | 74 | 79 | 80 | 81 | -------------------------------------------------------------------------------- /assets/img/stream-transformer-diagram.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Stream Transformer Pattern 8 | 9 | 10 | 11 | 12 | Input Stream 13 | 14 | Data 15 | 16 | 17 | 18 | Transform 19 | 20 | Process 21 | 22 | 23 | 24 | Output Stream 25 | 26 | Result 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | -------------------------------------------------------------------------------- /examples/AdaptiveRateLimiter.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const app = express(); 3 | 4 | class AdaptiveRateLimiter { 5 | constructor(options = {}) { 6 | this.baseLimit = options.baseLimit || 100; 7 | this.windowMs = options.windowMs || 60000; 8 | this.minLimit = options.minLimit || 10; 9 | this.maxLimit = options.maxLimit || 1000; 10 | 11 | this.currentLimit = this.baseLimit; 12 | this.requests = new Map(); 13 | this.metrics = { 14 | successCount: 0, 15 | errorCount: 0, 16 | avgResponseTime: 0 17 | }; 18 | } 19 | 20 | async isAllowed(clientId) { 21 | this.cleanup(); 22 | await this.updateMetrics(); 23 | 24 | const clientRequests = this.requests.get(clientId) || []; 25 | const windowStart = Date.now() - this.windowMs; 26 | const recentRequests = clientRequests.filter(time => time > windowStart); 27 | 28 | if (recentRequests.length >= this.currentLimit) { 29 | return false; 30 | } 31 | 32 | recentRequests.push(Date.now()); 33 | this.requests.set(clientId, recentRequests); 34 | return true; 35 | } 36 | 37 | cleanup() { 38 | const windowStart = Date.now() - this.windowMs; 39 | for (const [clientId, requests] of this.requests.entries()) { 40 | const validRequests = requests.filter(time => time > windowStart); 41 | if (validRequests.length === 0) { 42 | this.requests.delete(clientId); 43 | } else { 44 | this.requests.set(clientId, validRequests); 45 | } 46 | } 47 | } 48 | 49 | async updateMetrics() { 50 | const systemLoad = await this.getSystemMetrics(); 51 | const errorRate = this.metrics.errorCount / 52 | (this.metrics.successCount + this.metrics.errorCount || 1); 53 | 54 | this.adjustLimit(systemLoad, errorRate); 55 | } 56 | 57 | adjustLimit(systemLoad, errorRate) { 58 | let multiplier = 1; 59 | 60 | // Adjust based on system load 61 | if (systemLoad > 0.8) multiplier *= 0.8; 62 | else if (systemLoad < 0.3) multiplier *= 1.2; 63 | 64 | // Adjust based on error rate 65 | if (errorRate > 0.1) multiplier *= 0.7; 66 | else if (errorRate < 0.01) multiplier *= 1.1; 67 | 68 | this.currentLimit = Math.min( 69 | this.maxLimit, 70 | Math.max( 71 | this.minLimit, 72 | Math.floor(this.currentLimit * multiplier) 73 | ) 74 | ); 75 | } 76 | 77 | async getSystemMetrics() { 78 | const usage = process.cpuUsage(); 79 | return (usage.user + usage.system) / 1000000; // Convert to seconds 80 | } 81 | } 82 | 83 | class EnhancedAdaptiveRateLimiter extends AdaptiveRateLimiter { 84 | constructor(options = {}) { 85 | super(options); 86 | this.metricsWindow = new Array(10).fill({ 87 | timestamp: Date.now(), 88 | cpuLoad: 0, 89 | memoryUsage: 0, 90 | responseTime: 0, 91 | errorRate: 0 92 | }); 93 | } 94 | 95 | async collectMetrics() { 96 | const metrics = { 97 | timestamp: Date.now(), 98 | cpuLoad: await this.getCPULoad(), 99 | memoryUsage: await this.getMemoryUsage(), 100 | responseTime: this.metrics.avgResponseTime, 101 | errorRate: this.getErrorRate() 102 | }; 103 | 104 | this.metricsWindow.shift(); 105 | this.metricsWindow.push(metrics); 106 | 107 | return this.analyzeMetrics(); 108 | } 109 | 110 | analyzeMetrics() { 111 | const recent = this.metricsWindow.slice(-3); 112 | const trend = { 113 | cpuLoad: this.calculateTrend(recent, 'cpuLoad'), 114 | responseTime: this.calculateTrend(recent, 'responseTime'), 115 | errorRate: this.calculateTrend(recent, 'errorRate') 116 | }; 117 | 118 | return trend; 119 | } 120 | 121 | calculateTrend(metrics, key) { 122 | if (metrics.length < 2) return 0; 123 | const values = metrics.map(m => m[key]); 124 | const delta = values[values.length - 1] - values[0]; 125 | return delta / values[0]; 126 | } 127 | 128 | async getCPULoad() { 129 | const startUsage = process.cpuUsage(); 130 | await new Promise(resolve => setTimeout(resolve, 100)); 131 | const endUsage = process.cpuUsage(startUsage); 132 | return (endUsage.user + endUsage.system) / 1000000; 133 | } 134 | 135 | async getMemoryUsage() { 136 | const used = process.memoryUsage(); 137 | return used.heapUsed / used.heapTotal; 138 | } 139 | 140 | getErrorRate() { 141 | const total = this.metrics.successCount + this.metrics.errorCount; 142 | return total ? this.metrics.errorCount / total : 0; 143 | } 144 | } 145 | 146 | const limiter = new EnhancedAdaptiveRateLimiter({ 147 | baseLimit: 3, 148 | windowMs: 60000 149 | }); 150 | 151 | app.get('/', async (req, res, next) => { 152 | const clientId = req.ip; 153 | const startTime = Date.now(); 154 | 155 | try { 156 | const allowed = await limiter.isAllowed(clientId); 157 | if (!allowed) { 158 | return res.status(429).json({ 159 | error: 'Too Many Requests', 160 | currentLimit: limiter.currentLimit, 161 | retryAfter: Math.ceil(limiter.windowMs / 1000) 162 | }); 163 | } 164 | 165 | const duration = Date.now() - startTime; 166 | 167 | if (res.statusCode >= 500) { 168 | limiter.metrics.errorCount++; 169 | } else { 170 | limiter.metrics.successCount++; 171 | } 172 | limiter.metrics.avgResponseTime = 173 | (limiter.metrics.avgResponseTime + duration) / 2; 174 | 175 | res.json(limiter); 176 | } catch (error) { 177 | next(error); 178 | } 179 | }); 180 | 181 | app.listen(3000, () => { 182 | console.log('Server listening on port 3000'); 183 | }); 184 | -------------------------------------------------------------------------------- /examples/DependencyInjectionContainer.js: -------------------------------------------------------------------------------- 1 | class DIContainer { 2 | constructor() { 3 | this.services = new Map(); 4 | this.singletons = new Map(); 5 | } 6 | 7 | // Register a service with its implementation 8 | register(name, Implementation, dependencies = []) { 9 | this.services.set(name, { 10 | Implementation, 11 | dependencies, 12 | singleton: false 13 | }); 14 | return this; 15 | } 16 | 17 | // Register a singleton service 18 | registerSingleton(name, Implementation, dependencies = []) { 19 | this.services.set(name, { 20 | Implementation, 21 | dependencies, 22 | singleton: true 23 | }); 24 | return this; 25 | } 26 | 27 | // Resolve a service and its dependencies 28 | resolve(name) { 29 | const service = this.services.get(name); 30 | if (!service) { 31 | throw new Error(`Service ${name} not registered`); 32 | } 33 | 34 | if (service.singleton && this.singletons.has(name)) { 35 | return this.singletons.get(name); 36 | } 37 | 38 | const dependencies = service.dependencies.map(dep => this.resolve(dep)); 39 | const instance = new service.Implementation(...dependencies); 40 | 41 | if (service.singleton) { 42 | this.singletons.set(name, instance); 43 | } 44 | 45 | return instance; 46 | } 47 | } 48 | 49 | class EmailService { 50 | async sendOrderConfirmation(user, productId) { 51 | // Implementation 52 | console.log('Order confirmation sent', user, productId); 53 | } 54 | } 55 | 56 | class PaymentService { 57 | async processPayment(amount, userId) { 58 | // Implementation 59 | console.log('Payment processed', amount, userId); 60 | } 61 | } 62 | 63 | class OrderService { 64 | constructor(emailService, paymentService) { 65 | this.emailService = emailService; 66 | this.paymentService = paymentService; 67 | } 68 | 69 | async createOrder(userId, productId) { 70 | const email = await this.emailService.sendOrderConfirmation(userId, productId); 71 | const payment = await this.paymentService.processPayment(100, userId); 72 | // Implementation 73 | } 74 | } 75 | 76 | const container = new DIContainer(); 77 | 78 | // Register services 79 | container.registerSingleton('emailService', EmailService); 80 | container.registerSingleton('paymentService', PaymentService); 81 | 82 | // Register OrderService with its dependencies 83 | container.register('orderService', OrderService, [ 84 | 'emailService', 85 | 'paymentService' 86 | ]); 87 | 88 | // Resolve the OrderService when needed 89 | const orderService = container.resolve('orderService'); 90 | 91 | orderService.createOrder(1, 2); 92 | -------------------------------------------------------------------------------- /examples/PluginManager.js: -------------------------------------------------------------------------------- 1 | const fs = require('fs'); 2 | 3 | class PluginManager { 4 | #plugins = new Map(); 5 | #hooks = new Map(); 6 | 7 | async registerPlugin(plugin) { 8 | // Validate plugin structure 9 | if (!plugin.name || !plugin.version) { 10 | throw new Error('Plugin must have name and version properties'); 11 | } 12 | 13 | if (this.#plugins.has(plugin.name)) { 14 | throw new Error(`Plugin ${plugin.name} is already registered`); 15 | } 16 | 17 | // Initialize plugin if needed 18 | if (typeof plugin.initialize === 'function') { 19 | try { 20 | await plugin.initialize(); 21 | } catch (error) { 22 | throw new Error(`Failed to initialize plugin ${plugin.name}: ${error.message}`); 23 | } 24 | } 25 | 26 | // Register plugin hooks 27 | for (const [hookName, hookFn] of Object.entries(plugin.hooks || {})) { 28 | if (!this.#hooks.has(hookName)) { 29 | this.#hooks.set(hookName, new Set()); 30 | } 31 | this.#hooks.get(hookName).add(hookFn); 32 | } 33 | 34 | this.#plugins.set(plugin.name, plugin); 35 | console.log(`Plugin ${plugin.name} v${plugin.version} registered successfully`); 36 | } 37 | 38 | async executeHook(hookName, ...args) { 39 | const hooks = this.#hooks.get(hookName); 40 | if (!hooks) { 41 | return []; 42 | } 43 | 44 | const results = []; 45 | for (const hook of hooks) { 46 | try { 47 | const result = await hook(...args); 48 | results.push(result); 49 | } catch (error) { 50 | console.error(`Error executing hook ${hookName}: ${error.message}`); 51 | results.push(null); 52 | } 53 | } 54 | return results; 55 | } 56 | 57 | async unregisterPlugin(pluginName) { 58 | const plugin = this.#plugins.get(pluginName); 59 | if (!plugin) { 60 | throw new Error(`Plugin ${pluginName} is not registered`); 61 | } 62 | 63 | // Remove plugin hooks 64 | for (const [hookName, hooks] of this.#hooks.entries()) { 65 | for (const hookFn of Object.values(plugin.hooks || {})) { 66 | hooks.delete(hookFn); 67 | } 68 | if (hooks.size === 0) { 69 | this.#hooks.delete(hookName); 70 | } 71 | } 72 | 73 | // Shutdown plugin if needed 74 | if (typeof plugin.shutdown === 'function') { 75 | try { 76 | await plugin.shutdown(); 77 | } catch (error) { 78 | console.error(`Error shutting down plugin ${pluginName}: ${error.message}`); 79 | } 80 | } 81 | 82 | this.#plugins.delete(pluginName); 83 | console.log(`Plugin ${pluginName} unregistered successfully`); 84 | } 85 | 86 | getPlugin(pluginName) { 87 | return this.#plugins.get(pluginName); 88 | } 89 | 90 | listPlugins() { 91 | return Array.from(this.#plugins.entries()).map(([name, plugin]) => ({ 92 | name, 93 | version: plugin.version 94 | })); 95 | } 96 | } 97 | 98 | // Console Logger Plugin 99 | const consoleLoggerPlugin = { 100 | name: 'console-logger', 101 | version: '1.0.0', 102 | hooks: { 103 | 'onLog': async (level, message) => { 104 | const timestamp = new Date().toISOString(); 105 | console.log(`[${timestamp}] ${level}: ${message}`); 106 | } 107 | } 108 | }; 109 | 110 | // File Logger Plugin 111 | const fileLoggerPlugin = { 112 | name: 'file-logger', 113 | version: '1.0.0', 114 | initialize: async () => { 115 | // Setup file handles, create directories, etc. 116 | await fs.promises.mkdir('./logs', { recursive: true }); 117 | }, 118 | shutdown: async () => { 119 | // Close file handles, etc. 120 | }, 121 | hooks: { 122 | 'onLog': async (level, message) => { 123 | const timestamp = new Date().toISOString(); 124 | const logLine = `[${timestamp}] ${level}: ${message}\n`; 125 | await fs.promises.appendFile('./logs/app.log', logLine); 126 | } 127 | } 128 | }; 129 | 130 | // Slack Notification Plugin (for error logs only) 131 | const slackNotifierPlugin = { 132 | name: 'slack-notifier', 133 | version: '1.0.0', 134 | initialize: async () => { 135 | // Initialize Slack client 136 | }, 137 | hooks: { 138 | 'onLog': async (level, message) => { 139 | if (level === 'ERROR') { 140 | // Send it to Slack (implementation omitted for brevity) 141 | await sendToSlack(`🚨 Error: ${message}`); 142 | } 143 | } 144 | } 145 | }; 146 | 147 | async function main() { 148 | // Create plugin manager instance 149 | const pluginManager = new PluginManager(); 150 | 151 | // Register plugins 152 | await pluginManager.registerPlugin(consoleLoggerPlugin); 153 | await pluginManager.registerPlugin(fileLoggerPlugin); 154 | await pluginManager.registerPlugin(slackNotifierPlugin); 155 | 156 | // Create a logging function that uses the plugins 157 | async function log(level, message) { 158 | await pluginManager.executeHook('onLog', level, message); 159 | } 160 | 161 | // Example usage 162 | await log('INFO', 'Application started'); 163 | await log('ERROR', 'Failed to connect to database'); 164 | 165 | // List all registered plugins 166 | console.log('Registered plugins:', pluginManager.listPlugins()); 167 | 168 | // Cleanup 169 | await pluginManager.unregisterPlugin('slack-notifier'); 170 | } 171 | 172 | main().catch(console.error); 173 | -------------------------------------------------------------------------------- /examples/RetryMechanism.js: -------------------------------------------------------------------------------- 1 | class RetryError extends Error { 2 | constructor(originalError, attempts, duration) { 3 | super(originalError.message); 4 | this.name = 'RetryError'; 5 | this.originalError = originalError; 6 | this.attempts = attempts; 7 | this.duration = duration; 8 | } 9 | } 10 | 11 | class ExponentialBackoffRetry { 12 | constructor(options = {}) { 13 | this.baseDelay = options.baseDelay || 1000; 14 | this.maxDelay = options.maxDelay || 30000; 15 | this.maxRetries = options.maxRetries || 5; 16 | this.jitter = options.jitter || true; 17 | } 18 | 19 | async execute(fn) { 20 | let retries = 0; 21 | 22 | while (true) { 23 | try { 24 | return await fn(); 25 | } catch (error) { 26 | if (retries >= this.maxRetries) { 27 | throw new Error(`Failed after ${retries} retries: ${error.message}`); 28 | } 29 | 30 | const delay = this.calculateDelay(retries); 31 | await this.wait(delay); 32 | retries++; 33 | } 34 | } 35 | } 36 | 37 | calculateDelay(retryCount) { 38 | // Calculate exponential delay: 2^retryCount * baseDelay 39 | let delay = Math.min( 40 | this.maxDelay, 41 | Math.pow(2, retryCount) * this.baseDelay 42 | ); 43 | 44 | // Add jitter to prevent thundering herd problem 45 | if (this.jitter) { 46 | delay = delay * (0.5 + Math.random()); 47 | } 48 | 49 | return delay; 50 | } 51 | 52 | wait(ms) { 53 | return new Promise(resolve => setTimeout(resolve, ms)); 54 | } 55 | } 56 | 57 | class CircuitBreaker { 58 | constructor(options = {}) { 59 | this.failureThreshold = options.failureThreshold || 5; 60 | this.resetTimeout = options.resetTimeout || 60000; 61 | this.failures = 0; 62 | this.state = 'CLOSED'; 63 | this.lastFailureTime = null; 64 | } 65 | 66 | async execute(fn) { 67 | if (this.state === 'OPEN') { 68 | if (Date.now() - this.lastFailureTime >= this.resetTimeout) { 69 | this.state = 'HALF_OPEN'; 70 | } else { 71 | throw new Error('Circuit breaker is OPEN'); 72 | } 73 | } 74 | 75 | try { 76 | const result = await fn(); 77 | if (this.state === 'HALF_OPEN') { 78 | this.state = 'CLOSED'; 79 | this.failures = 0; 80 | } 81 | return result; 82 | } catch (error) { 83 | this.failures++; 84 | this.lastFailureTime = Date.now(); 85 | 86 | if (this.failures >= this.failureThreshold) { 87 | this.state = 'OPEN'; 88 | } 89 | throw error; 90 | } 91 | } 92 | } 93 | 94 | class RetryMechanism { 95 | constructor(options = {}) { 96 | this.retrier = new ExponentialBackoffRetry(options.retry); 97 | this.circuitBreaker = new CircuitBreaker(options.circuitBreaker); 98 | this.logger = options.logger || console; 99 | } 100 | 101 | async execute(fn, context = {}) { 102 | const startTime = Date.now(); 103 | let attempts = 0; 104 | 105 | try { 106 | return await this.circuitBreaker.execute(async () => { 107 | return await this.retrier.execute(async () => { 108 | attempts++; 109 | try { 110 | const result = await fn(); 111 | this.logSuccess(context, attempts, startTime); 112 | return result; 113 | } catch (error) { 114 | this.logFailure(context, attempts, error); 115 | throw error; 116 | } 117 | }); 118 | }); 119 | } catch (error) { 120 | throw new RetryError(error, attempts, Date.now() - startTime); 121 | } 122 | } 123 | 124 | logSuccess(context, attempts, startTime) { 125 | this.logger.info({ 126 | event: 'retry_success', 127 | context, 128 | attempts, 129 | duration: Date.now() - startTime 130 | }); 131 | } 132 | 133 | logFailure(context, attempts, error) { 134 | this.logger.error({ 135 | event: 'retry_failure', 136 | context, 137 | attempts, 138 | error: error.message 139 | }); 140 | } 141 | } 142 | 143 | const retrySystem = new RetryMechanism({ 144 | retry: { 145 | baseDelay: 1000, 146 | maxDelay: 30000, 147 | maxRetries: 5 148 | }, 149 | circuitBreaker: { 150 | failureThreshold: 5, 151 | resetTimeout: 60000 152 | } 153 | }); 154 | 155 | // Database operation with retry 156 | async function fetchUserData(userId) { 157 | return retrySystem.execute( 158 | async () => { 159 | const user = await db.users.findById(userId); 160 | if (!user) throw new Error('User not found'); 161 | return user; 162 | }, 163 | { operation: 'fetchUserData', userId } 164 | ); 165 | } 166 | 167 | fetchUserData('user123') 168 | .then(user => console.log('User:', user)) 169 | .catch(error => console.error('Error:', error)); 170 | 171 | 172 | // API call with retry 173 | async function updateUserProfile(userId, data) { 174 | return retrySystem.execute( 175 | async () => { 176 | const response = await fetch(`/api/users/${userId}`, { 177 | method: 'PUT', 178 | body: JSON.stringify(data) 179 | }); 180 | if (!response.ok) throw new Error('API request failed'); 181 | return response.json(); 182 | }, 183 | { operation: 'updateUserProfile', userId } 184 | ); 185 | } 186 | 187 | updateUserProfile('user123', { name: 'Alice' }) 188 | .then(response => console.log('Response:', response)) 189 | .catch(error => console.error('Error:', error)); 190 | -------------------------------------------------------------------------------- /examples/StreamTransformer.js: -------------------------------------------------------------------------------- 1 | const { Transform, Readable } = require('stream'); 2 | 3 | class StreamTransformer { 4 | /** 5 | * Creates a transform stream with custom transformation logic 6 | * @param {Object} options - Configuration options 7 | * @param {Function} options.transform - Transformation function 8 | * @param {Function} [options.flush] - Optional flush method 9 | * @param {boolean} [options.objectMode=true] - Enable object mode 10 | */ 11 | constructor(options = {}) { 12 | const { 13 | transform, 14 | flush = null, 15 | objectMode = true 16 | } = options; 17 | 18 | if (typeof transform !== 'function') { 19 | throw new Error('Transform function is required'); 20 | } 21 | 22 | return new Transform({ 23 | objectMode, 24 | 25 | // Transformation logic 26 | async transform(chunk, encoding, callback) { 27 | try { 28 | // Allow async transformations 29 | const result = await transform(chunk, this); 30 | 31 | // Push transformed data or multiple chunks 32 | if (Array.isArray(result)) { 33 | result.forEach(item => this.push(item)); 34 | } else if (result !== null && result !== undefined) { 35 | this.push(result); 36 | } 37 | 38 | callback(null); 39 | } catch (error) { 40 | callback(error); 41 | } 42 | }, 43 | 44 | // Optional flush method for end-of-stream processing 45 | async flush(callback) { 46 | try { 47 | if (flush) { 48 | const result = await flush(this); 49 | if (result) { 50 | this.push(result); 51 | } 52 | } 53 | callback(null); 54 | } catch (error) { 55 | callback(error); 56 | } 57 | } 58 | }); 59 | } 60 | 61 | /** 62 | * Create a pipeline of transformers 63 | * @param {...StreamTransformer} transformers - Transformer streams 64 | * @returns {Object} Pipeline interface 65 | */ 66 | static pipeline(...transformers) { 67 | return { 68 | /** 69 | * Pipe transformers to an input stream 70 | * @param {Readable} inputStream - Source stream 71 | * @returns {Readable} Transformed stream 72 | */ 73 | through: (inputStream) => { 74 | return transformers.reduce( 75 | (stream, transformer) => stream.pipe(transformer), 76 | inputStream 77 | ); 78 | } 79 | }; 80 | } 81 | } 82 | 83 | // Practical Example Demonstrating StreamTransformer 84 | async function demonstrateStreamTransformer() { 85 | // Example 1: Simple Data Transformation 86 | const numberTransformer = new StreamTransformer({ 87 | transform: (chunk) => chunk * 2 88 | }); 89 | 90 | const sourceStream = new Readable({ 91 | objectMode: true, 92 | read() { 93 | this.push(1); 94 | this.push(2); 95 | this.push(3); 96 | this.push(null); // End of stream 97 | } 98 | }); 99 | 100 | sourceStream 101 | .pipe(numberTransformer) 102 | .on('data', (chunk) => { 103 | console.log('Doubled number:', chunk); 104 | }) 105 | .on('end', () => console.log('Number transformation complete')); 106 | 107 | // Example 2: Complex Data Transformation 108 | const userDataTransformer = new StreamTransformer({ 109 | transform: async (user) => { 110 | // Simulate async operation (e.g., data enrichment) 111 | await new Promise(resolve => setTimeout(resolve, 100)); 112 | 113 | // Transform and filter users 114 | if (user.age >= 18) { 115 | return { 116 | ...user, 117 | category: user.age < 30 ? 'Young Adult' : 'Adult' 118 | }; 119 | } 120 | 121 | // Return null to filter out underage users 122 | return null; 123 | }, 124 | 125 | // Optional flush method for final processing 126 | flush: () => { 127 | console.log('Finished processing user stream'); 128 | } 129 | }); 130 | 131 | const usersStream = new Readable({ 132 | objectMode: true, 133 | read() { 134 | this.push({ name: 'Alice', age: 25 }); 135 | this.push({ name: 'Bob', age: 17 }); 136 | this.push({ name: 'Charlie', age: 40 }); 137 | this.push(null); 138 | } 139 | }); 140 | 141 | usersStream 142 | .pipe(userDataTransformer) 143 | .on('data', (user) => { 144 | console.log('Processed User:', user); 145 | }) 146 | .on('end', () => console.log('User transformation complete')); 147 | 148 | // Example 3: Pipeline Composition 149 | const uppercaseTransformer = new StreamTransformer({ 150 | transform: (chunk) => chunk.toUpperCase(), 151 | objectMode: true 152 | }); 153 | 154 | const filterTransformer = new StreamTransformer({ 155 | transform: (chunk) => chunk.length > 3 ? chunk : null, 156 | objectMode: true 157 | }); 158 | 159 | const wordsStream = new Readable({ 160 | objectMode: true, 161 | read() { 162 | this.push('hello'); 163 | this.push('hi'); 164 | this.push('world'); 165 | this.push('a'); 166 | this.push(null); 167 | } 168 | }); 169 | 170 | // Create a pipeline with multiple transformers 171 | const pipeline = StreamTransformer.pipeline( 172 | filterTransformer, 173 | uppercaseTransformer 174 | ); 175 | 176 | pipeline 177 | .through(wordsStream) 178 | .on('data', (word) => { 179 | console.log('Processed Word:', word); 180 | }) 181 | .on('end', () => console.log('Pipeline transformation complete')); 182 | } 183 | 184 | // Run the demonstration 185 | demonstrateStreamTransformer().catch(console.error); 186 | 187 | module.exports = StreamTransformer; 188 | -------------------------------------------------------------------------------- /package-lock.json: 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-------------------------------------------------------------------------------- 1 | { 2 | "name": "nodeteamdev.github.io", 3 | "version": "1.0.0", 4 | "description": "## Table of Contents", 5 | "main": "index.js", 6 | "directories": { 7 | "example": "examples" 8 | }, 9 | "scripts": { 10 | "test": "echo \"Error: no test specified\" && exit 1", 11 | "example:1": "node ./examples/StreamTransformer.js", 12 | "example:2": "node ./examples/RetryMechanism.js", 13 | "example:3": "node ./examples/AdaptiveRateLimiter.js", 14 | "example:4": "node ./examples/DependencyInjectionContainer.js", 15 | "example:5": "node ./examples/PluginManager.js" 16 | }, 17 | "repository": { 18 | "type": "git", 19 | "url": "git+https://github.com/nodeteamdev/nodeteamdev.github.io.git" 20 | }, 21 | "keywords": [], 22 | "author": "", 23 | "license": "ISC", 24 | "bugs": { 25 | "url": "https://github.com/nodeteamdev/nodeteamdev.github.io/issues" 26 | }, 27 | "homepage": "https://github.com/nodeteamdev/nodeteamdev.github.io#readme", 28 | "devDependencies": { 29 | "express": "^4.21.2" 30 | } 31 | } 32 | --------------------------------------------------------------------------------