promise实现一个动态删减并持续执行的队列

 

promiseQueue.js：

/*
 * @Author: Simoon.jia
 * @Date: 2024-09-04 16:00:24
 * @LastEditors: Simoon.jia
 * @LastEditTime: 2024-09-04 16:55:48
 * @Description: 描述
 */
export class PromiseQueue {
  constructor() {
    this.queue = [];
    this.isProcessing = false; // 标志当前是否有任务在执行
  }

  // 添加任务到队列
  add(task) {
    return new Promise((resolve, reject) => {
      this.queue.push({ task, resolve, reject });
      // console.log(this.queue, '执行队列');
      this.runNext(); // 尝试运行下一个任务
    });
  }

  // 运行下一个任务
  runNext() {
    if (this.isProcessing || this.queue.length === 0) {
      return;
    }
    this.isProcessing = true;
    const { task, resolve, reject } = this.queue.shift(); // 取出队首任务

    task()
      .then((result) => {
        this.isProcessing = false;
        resolve(result);
        this.runNext(); // 任务完成后运行下一个任务
      })
      .catch((error) => {
        this.isProcessing = false;
        reject(error);
        this.runNext(); // 处理失败后仍然运行下一个任务
      });
  }
}

调用：

 useEffect(() => {
    promiseQueue.current = new PromiseQueue();
  }, []);

//动态添加任务
 promiseQueue.current.add(() => new Promise((resolve, reject) => {
        switch (voiceBroadcast) {
          case '1':
            audio.play();
            audio.onended = () => {
              resolve();
            };

            break;
          case '2':
            window.speechSynthesis.speak(sound);
            sound.onend = () => {
              resolve();
            };
            break;

          default:
            audio.play();
            audio.onended = () => {
              window.speechSynthesis.speak(sound);
              sound.onend = () => {
                resolve();
              };
            };
            break;
          // 添加播放结束后的回调函数
          // audio.addEventListener('ended', onAudioEnded);
        }
      });
    );

 

样例：

class PromiseQueue {
    constructor() {
        this.queue = [];
        this.isProcessing = false; // 标志当前是否有任务在执行
    }

    // 添加任务到队列
    add(task) {
        return new Promise((resolve, reject) => {
            this.queue.push({ task, resolve, reject });
            this.runNext(); // 尝试运行下一个任务
        });
    }

    // 运行下一个任务
    runNext() {
        if (this.isProcessing || this.queue.length === 0) {
            return;
        }

        this.isProcessing = true;

        const { task, resolve, reject } = this.queue.shift(); // 取出队首任务

        task()
            .then((result) => {
                this.isProcessing = false;
                resolve(result);
                this.runNext(); // 任务完成后运行下一个任务
            })
            .catch((error) => {
                this.isProcessing = false;
                reject(error);
                this.runNext(); // 处理失败后仍然运行下一个任务
            });
    }
}

// 示例任务函数，返回一个Promise
const createTask = (taskName, duration) => () => {
    return new Promise((resolve) => {
        setTimeout(() => {
            console.log(`${taskName} completed`);
            resolve(taskName);
        }, duration);
    });
};

// 使用PromiseQueue
const queue = new PromiseQueue();

queue.add(createTask('Task 1', 1000));
queue.add(createTask('Task 2', 500));
queue.add(createTask('Task 3', 1500));

// 动态添加任务
setTimeout(() => {
    queue.add(createTask('Task 4', 1000));
}, 2000);