이벤트루프를 활용한 입력 출력 예시

donggil/EventLoop.js

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+import { Queue } from './Queue.js';
+
+export class EventLoop {
+  #timer;
+  #queue;
+  #action;
+
+  constructor(action) {
+    this.#queue = new Queue();
+    this.#action = action;
+  }
+
+  init() {
+    this.#timer = setInterval(() => {
+      if (!this.#queue.isEmpty()) {
+        const value = this.#queue.dequeue();
+        this.#action(value);
+      }
+    }, 1000);
+  }
+
+  end() {
+    clearInterval(this.#timer);
+  }
+
+  add(value) {
+    this.#queue.enqueue(value);
+  }
+}

donggil/Printer.js

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+import { EventLoop } from './EventLoop.js';
+
+export class Printer {
+  #eventLoop;
+  constructor() {
+    const print = (value) => {
+      console.log(value);
+    };
+
+    this.#eventLoop = new EventLoop(print);
+    this.#eventLoop.init();
+  }
+  add(value) {
+    this.#eventLoop.add(value);
+  }
+}

donggil/Queue.js

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+export class Queue {
+  constructor() {
+    this.items = [];
+  }
+
+  enqueue(value) {
+    this.items.push(value);
+  }
+
+  dequeue() {
+    const cur = this.items.shift();
+    if (cur === undefined) throw new Error('큐가 비었습니다.');
+    return cur;
+  }
+
+  peek() {
+    return this.items[0];
+  }
+
+  getSize() {
+    return this.items.length;
+  }
+
+  isEmpty() {
+    return this.getSize() === 0;
+  }
+}

donggil/index.js

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+import { getInput } from './input.js';
+import { Printer } from './Printer.js';
+
+const pos = new Printer();
+
+['첫번째 메시지 출력!!', '두번째 메시지 출력!!', '세번째 메시지 출력'].forEach(
+  (each) => pos.add(each)
+);
+while (1) {
+  const result = await getInput();
+  pos.add(result);
+}

donggil/input.js

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+import readline from 'node:readline/promises';
+import { stdin as input, stdout as output } from 'node:process';
+const rl = readline.createInterface({ input, output });
+
+export const getInput = async () => {
+  const result = await rl.question('> ');
+  return result;
+};

donggil/package.json

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+{
+  "name": "donggil",
+  "version": "1.0.0",
+  "description": "",
+  "main": "EventLoop.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type":"module"
+}