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网页制作素材去哪找,成都网站seo公司,wordpress添加关键词描述,找别人做网站要注意什么软件Node.js架构设计指南 🏗️ 引言 Node.js作为一个高性能的JavaScript运行时环境，其架构设计对于构建可扩展的服务端应用至关重要。本文将深入探讨Node.js的架构设计原则、最佳实践和实现方案。架构概述 Node.js架构主要包括以下方面： 事…

Node.js架构设计指南 🏗️

引言

Node.js作为一个高性能的JavaScript运行时环境，其架构设计对于构建可扩展的服务端应用至关重要。本文将深入探讨Node.js的架构设计原则、最佳实践和实现方案。

架构概述

Node.js架构主要包括以下方面：

事件驱动：基于事件循环的异步非阻塞架构
模块系统：CommonJS和ES模块系统
进程模型：单线程主进程与工作线程
流处理：基于Stream的数据处理
错误处理：异步错误处理与进程异常管理

架构实现

应用架构管理器

// 应用架构管理器
class ApplicationArchitecture {private static instance: ApplicationArchitecture;private config: ArchitectureConfig;private modules: Map<string, ModuleWrapper>;private workers: Map<string, Worker>;private streams: Map<string, StreamHandler>;private constructor() {this.modules = new Map();this.workers = new Map();this.streams = new Map();this.config = {maxWorkers: os.cpus().length,modulePrefix: 'app',streamBufferSize: 1024 * 1024};}// 获取单例实例static getInstance(): ApplicationArchitecture {if (!ApplicationArchitecture.instance) {ApplicationArchitecture.instance = new ApplicationArchitecture();}return ApplicationArchitecture.instance;}// 初始化应用架构init(config: ArchitectureConfig): void {this.config = { ...this.config, ...config };// 初始化模块系统this.initializeModuleSystem();// 初始化工作线程this.initializeWorkers();// 初始化流处理this.initializeStreams();// 设置错误处理this.setupErrorHandling();}// 初始化模块系统private initializeModuleSystem(): void {// 设置模块加载器require.extensions['.ts'] = (module: any, filename: string) => {const content = fs.readFileSync(filename, 'utf8');module._compile(content, filename);};// 注册内置模块this.registerCoreModules();}// 注册核心模块private registerCoreModules(): void {const coreModules = ['logger','config','database','cache','queue'];coreModules.forEach(name => {const module = require(`./core/${name}`);this.registerModule(name, module);});}// 注册模块registerModule(name: string, moduleImpl: any): void {const wrapper = new ModuleWrapper(name, moduleImpl);this.modules.set(name, wrapper);}// 获取模块getModule(name: string): any {const wrapper = this.modules.get(name);if (!wrapper) {throw new Error(`Module ${name} not found`);}return wrapper.getInstance();}// 初始化工作线程private initializeWorkers(): void {for (let i = 0; i < this.config.maxWorkers; i++) {const worker = new Worker('./worker.js');this.workers.set(`worker-${i}`, worker);// 设置工作线程消息处理worker.on('message', this.handleWorkerMessage.bind(this));worker.on('error', this.handleWorkerError.bind(this));worker.on('exit', this.handleWorkerExit.bind(this));}}// 处理工作线程消息private handleWorkerMessage(message: any): void {console.log('Worker message:', message);}// 处理工作线程错误private handleWorkerError(error: Error): void {console.error('Worker error:', error);}// 处理工作线程退出private handleWorkerExit(code: number): void {console.log('Worker exit with code:', code);}// 初始化流处理private initializeStreams(): void {// 创建标准流处理器this.createStreamHandler('stdout', process.stdout);this.createStreamHandler('stderr', process.stderr);// 创建自定义流处理器this.createStreamHandler('file', fs.createWriteStream('app.log'));this.createStreamHandler('network', new net.Socket());}// 创建流处理器private createStreamHandler(name: string,stream: NodeJS.WritableStream): void {const handler = new StreamHandler(stream, {highWaterMark: this.config.streamBufferSize});this.streams.set(name, handler);}// 获取流处理器getStream(name: string): StreamHandler {const handler = this.streams.get(name);if (!handler) {throw new Error(`Stream ${name} not found`);}return handler;}// 设置错误处理private setupErrorHandling(): void {// 处理未捕获的异常process.on('uncaughtException', this.handleUncaughtException.bind(this));// 处理未处理的Promise拒绝process.on('unhandledRejection', this.handleUnhandledRejection.bind(this));// 处理进程信号process.on('SIGTERM', this.handleProcessTermination.bind(this));process.on('SIGINT', this.handleProcessTermination.bind(this));}// 处理未捕获的异常private handleUncaughtException(error: Error): void {console.error('Uncaught exception:', error);this.gracefulShutdown();}// 处理未处理的Promise拒绝private handleUnhandledRejection(reason: any,promise: Promise<any>): void {console.error('Unhandled rejection:', reason);}// 处理进程终止private handleProcessTermination(): void {console.log('Process termination requested');this.gracefulShutdown();}// 优雅关闭async gracefulShutdown(): Promise<void> {try {// 停止接受新的请求console.log('Stopping new requests...');// 等待现有请求完成console.log('Waiting for existing requests...');await this.waitForRequests();// 关闭工作线程console.log('Closing workers...');await this.closeWorkers();// 关闭流console.log('Closing streams...');await this.closeStreams();// 关闭模块console.log('Closing modules...');await this.closeModules();console.log('Graceful shutdown completed');process.exit(0);} catch (error) {console.error('Error during shutdown:', error);process.exit(1);}}// 等待请求完成private async waitForRequests(): Promise<void> {// 实现等待逻辑await new Promise(resolve => setTimeout(resolve, 5000));}// 关闭工作线程private async closeWorkers(): Promise<void> {const promises = Array.from(this.workers.values()).map(worker => {return new Promise<void>((resolve, reject) => {worker.terminate().then(() => resolve()).catch(reject);});});await Promise.all(promises);}// 关闭流private async closeStreams(): Promise<void> {const promises = Array.from(this.streams.values()).map(handler => {return handler.close();});await Promise.all(promises);}// 关闭模块private async closeModules(): Promise<void> {const promises = Array.from(this.modules.values()).map(wrapper => {return wrapper.destroy();});await Promise.all(promises);}
}// 模块包装器
class ModuleWrapper {private instance: any;constructor(private name: string,private moduleImpl: any) {this.instance = new moduleImpl();}getInstance(): any {return this.instance;}async destroy(): Promise<void> {if (typeof this.instance.destroy === 'function') {await this.instance.destroy();}}
}// 流处理器
class StreamHandler {private buffer: any[] = [];private isProcessing: boolean = false;constructor(private stream: NodeJS.WritableStream,private options: StreamOptions) {}// 写入数据write(data: any): void {this.buffer.push(data);if (this.buffer.length >= this.options.highWaterMark) {this.flush();}if (!this.isProcessing) {this.process();}}// 处理缓冲数据private async process(): Promise<void> {this.isProcessing = true;while (this.buffer.length > 0) {if (!this.stream.writableCorked) {await this.flush();}await new Promise(resolve => setTimeout(resolve, 100));}this.isProcessing = false;}// 刷新缓冲区private async flush(): Promise<void> {if (this.buffer.length === 0) {return;}const chunk = this.buffer.splice(0, this.options.highWaterMark);return new Promise((resolve, reject) => {this.stream.write(chunk.join(''), error => {if (error) {reject(error);} else {resolve();}});});}// 关闭流async close(): Promise<void> {// 刷新剩余数据await this.flush();// 关闭流if (this.stream.end) {await new Promise<void>((resolve, reject) => {this.stream.end(error => {if (error) {reject(error);} else {resolve();}});});}}
}// 接口定义
interface ArchitectureConfig {maxWorkers: number;modulePrefix: string;streamBufferSize: number;
}interface StreamOptions {highWaterMark: number;
}// 使用示例
const architecture = ApplicationArchitecture.getInstance();// 初始化应用架构
architecture.init({maxWorkers: 4,modulePrefix: 'myapp',streamBufferSize: 1024 * 1024
});// 注册自定义模块
class CustomModule {async init(): Promise<void> {console.log('Custom module initialized');}async destroy(): Promise<void> {console.log('Custom module destroyed');}
}architecture.registerModule('custom', CustomModule);// 获取模块
const customModule = architecture.getModule('custom');
await customModule.init();// 使用流处理器
const logStream = architecture.getStream('file');
logStream.write('Application started\n');// 优雅关闭
process.on('SIGTERM', () => {architecture.gracefulShutdown();
});

事件驱动实现

// 事件管理器
class EventManager {private handlers: Map<string, Set<EventHandler>>;private maxListeners: number;constructor(maxListeners: number = 10) {this.handlers = new Map();this.maxListeners = maxListeners;}// 添加事件监听器on(event: string, handler: EventHandler): void {if (!this.handlers.has(event)) {this.handlers.set(event, new Set());}const handlers = this.handlers.get(event)!;if (handlers.size >= this.maxListeners) {console.warn(`Warning: Event ${event} has exceeded maximum listeners`);}handlers.add(handler);}// 移除事件监听器off(event: string, handler: EventHandler): void {const handlers = this.handlers.get(event);if (handlers) {handlers.delete(handler);}}// 触发事件emit(event: string, ...args: any[]): void {const handlers = this.handlers.get(event);if (handlers) {handlers.forEach(handler => {try {handler(...args);} catch (error) {console.error(`Error in event handler for ${event}:`,error);}});}}// 一次性事件监听器once(event: string, handler: EventHandler): void {const wrapper = (...args: any[]) => {this.off(event, wrapper);handler(...args);};this.on(event, wrapper);}// 移除所有监听器removeAllListeners(event?: string): void {if (event) {this.handlers.delete(event);} else {this.handlers.clear();}}// 获取监听器数量listenerCount(event: string): number {const handlers = this.handlers.get(event);return handlers ? handlers.size : 0;}
}type EventHandler = (...args: any[]) => void;// 使用示例
const events = new EventManager();// 添加事件监听器
events.on('data', data => {console.log('Received data:', data);
});// 触发事件
events.emit('data', { id: 1, name: 'test' });// 一次性事件
events.once('init', () => {console.log('Initialization complete');
});events.emit('init'); // 输出消息
events.emit('init'); // 无输出