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import { intervalUtils } from '@0xproject/utils';
import * as _ from 'lodash';
const MAX_QUEUE_SIZE = 500;
const DEFAULT_QUEUE_INTERVAL_MS = 1000;
export class DispatchQueue {
private _queueIntervalMs: number;
private _queue: Array<() => Promise<void>>;
private _queueIntervalIdIfExists?: NodeJS.Timer;
constructor() {
this._queueIntervalMs = DEFAULT_QUEUE_INTERVAL_MS;
this._queue = [];
this._start();
}
public add(task: () => Promise<void>): boolean {
if (this.isFull()) {
return false;
}
this._queue.push(task);
return true;
}
public size(): number {
return this._queue.length;
}
public isFull(): boolean {
return this.size() >= MAX_QUEUE_SIZE;
}
public stop() {
if (!_.isUndefined(this._queueIntervalIdIfExists)) {
intervalUtils.clearAsyncExcludingInterval(this._queueIntervalIdIfExists);
}
}
private _start() {
this._queueIntervalIdIfExists = intervalUtils.setAsyncExcludingInterval(
async () => {
const task = this._queue.shift();
if (_.isUndefined(task)) {
return Promise.resolve();
}
await task();
},
this._queueIntervalMs,
_.noop,
);
}
}
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