auto_lottery_2.js

// timerにexecutorを渡す例
// timerは定期実行と定期実行の終了に責任を持つ
// 実行される処理と処理を終了すべきかどうかの判断はexecutorが持つ
class Timer {
    constructor(executor, interval) {
        this.executor = executor;
        this.interval = interval;
    }
    start() {
        const execute = () => {
            this.timeoutId = setTimeout(execute, this.interval);
            this.executor.do();
            if (this.executor.shouldTerminate()) {
                this.stop();
            }
        }
        this.timeoutId = setTimeout(execute, this.interval);
        console.log("timer started!");
    }
    stop() {
        if (!this.timeoutId) return;
        console.log("timer stop!");
        clearTimeout(this.timeoutId);
        this.timeoutId = null;
    }
}

class Lottery {
    constructor(numbers) {
        this.numbers = numbers;
        this.index = 0;
    }
    do() {
        if (this.index >= this.numbers.length) return;
        console.log(`lottery #${this.index} returns ${this.numbers[this.index++]}`);
    }
    shouldTerminate() {
        return (this.index >= this.numbers.length);
    }
}

class Button {
    constructor(onClick) {
        this.onClick = onClick;
    }
    click() {
        console.log("clicked!");
        this.onClick();
    }
}

const executor = new Lottery([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9]);
const timer = new Timer(executor, 1000);
const button = new Button(() => { timer.stop() });

timer.start();
setTimeout(() => { button.click() }, 10000); // simulate click after 10sec

// 実行結果
// timer started!
// lottery #0 returns 3
// lottery #1 returns 1
// lottery #2 returns 4
// lottery #3 returns 1
// lottery #4 returns 5
// lottery #5 returns 9
// lottery #6 returns 2
// lottery #7 returns 6
// lottery #8 returns 5
// clicked!
// timer stop!