simple2k13/dist/functions/PromiseQueue/index.js

some simple functions

class PromiseQueue {
    taskId;
    arr;
    func;
    limit;
    count;
    pendingTask;
    finishSResolve;
    constructor() {
        this.taskId = 0;
        this.count = 0;
        this.arr = [];
        this.limit = 0;
        this.pendingTask = [];
        this.func = () => ({});
        this.finishSResolve = () => ({});
    }
    init(props) {
        const { arr = [], func, limit = 6 } = props || {};
        if (!arr.length || !func)
            return Promise.reject("arr and func is required");
        if (this.arr.length) {
            this.pendingTask.push({
                arr: [...this.arr],
                func: this.func,
                limit: this.limit,
            });
        }
        this.count = 0;
        this.arr = [...arr];
        this.limit = Math.min(limit, arr.length);
        this.func = func;
        this.loop(this.taskId);
        return new Promise((resolve) => {
            this.finishSResolve = resolve;
        });
    }
    async loop(taskId) {
        if (taskId !== this.taskId)
            return;
        if (this.arr.length === 0) {
            if (this.count <= 0) {
                this.finishSResolve("finish");
                const { arr, func, limit } = this.pendingTask.shift() || {};
                if (arr?.length && func) {
                    this.taskId += 1;
                    this.init({ arr, func, limit });
                }
            }
            else {
                setTimeout(() => this.loop(this.taskId), 100);
            }
            return;
        }
        this.count += 1;
        if (this.count < this.limit) {
            this.loop(this.taskId);
        }
        await this.func(this.arr.shift());
        if (taskId !== this.taskId)
            return;
        if (this.count >= this.limit) {
            this.loop(this.taskId);
        }
        this.count -= 1;
    }
    cancel() {
        this.taskId += 1;
        this.arr.length = 0;
        this.pendingTask.length = 0;
        return Promise.resolve("cancel");
    }
}
export default PromiseQueue;
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