@visactor/vtable/es/tools/LimitPromiseQueue.js

canvas table width high performance

export class LimitPromiseQueue {
    constructor(max) {
        this.max = max, this._count = 0, this._pendingTaskQueue = [];
    }
    call(caller, ...arg) {
        return new Promise(((resolve, reject) => {
            const task = this._createTask(caller, arg, resolve, reject);
            this._count >= this.max ? this._pendingTaskQueue.push(task) : task();
        }));
    }
    _createTask(caller, arg, resolve, reject) {
        return () => {
            this._count++, caller(...arg).then(resolve).catch(reject).finally((() => {
                if (this._count--, this._pendingTaskQueue.length) {
                    this._pendingTaskQueue.shift()();
                }
            }));
        };
    }
}
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