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@itharbors/event

v1.0.0

Published

[![NPM](https://img.shields.io/npm/v/@itharbors/event)](https://www.npmjs.com/package/@itharbors/event) [![CI Status](https://github.com/itharbors/event/actions/workflows/ci.yaml/badge.svg)](https://github.com/itharbors/event/actions/workflows/ci.yaml)

Downloads

1

Readme

Event

NPM CI Status

目标与范围

简单的事件发送功能,支持 TS 定义,在使用前定义好事件的类型以及监听函数的参数和返回值类型

需求分析

功能需求

  • 基础的事件功能
  • 支持定义事件名称和监听函数类型

非功能需求

  • 暂无

整体结构

图例

基本结构

classDiagram
    class EventEmitter {
        + addListener(action: string, handle: Function) void
        + addOnceListener(action: string, handle: Function) void
        + removeListener(action: string, handle: Function) void
        + clear(action?: string) void
        + emit(...args: any[]) HandleResult[]
    }

    class HandleResult {
        + result: any
        + error: any
    }

代码范例

基础用法

import { EventEmitter } from '@itharbors/event';

const emitter = new EventEmitter<{
    test: {
        params: [number, number];
        result: number;
    };
}>();

emitter.addListener('test', (a, b) => {
    console.log(a, b);
    return a + b;
});

emitter.emit('test-a', 1, 2);

关键决策

  • emit 只处理同步逻辑
    • 有可能需要处理异步,但是也有可能触发异步函数后,不需要处理,所以这里留给调用者处理

异常处理设计

  • 某个处理函数执行失败
    • 描述
      • 执行 handle 队列的时候,某个函数报错
    • 处理
      • 记录当前报错的 error
      • 继续后续函数执行

性能优化

  • 暂无

附件与参考文档

  • 暂无