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async-queue.ts demo
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type TCallback = (arg0?: any) => Promise<any>; | |
class AsyncQueue { | |
private queue: (() => void)[] = []; | |
private inProgress: boolean = false; | |
private intervalId: Timeout; | |
private interval: number = 1000; | |
private start() { | |
this.intervalId = setInterval(() => this.next(), this.interval); | |
}; | |
private stop() { | |
clearInterval(this.intervalId); | |
}; | |
private next() { | |
// if some request is still pending | |
if (this.inProgress) return; | |
// if the queue is empty | |
if (!this.queue.length) { | |
this.stop(); | |
return; | |
} | |
const [first, ...rest]: TCallback[] = this.queue; | |
this.queue = rest || []; | |
// disable any new request until the current is completed | |
this.inProgress = true; | |
first(); | |
}; | |
wrap(wrapped: TCallback) { | |
return (...rest: any[]) => new Promise((resolve, reject) => { | |
this.queue.push(() => { | |
wrapped(...rest) | |
.then(resolve, reject) | |
.finally(() => { | |
// unlock ability to run the next callback in the queue | |
this.inProgress = false; | |
}); | |
}); | |
if (!this.intervalId) { | |
// activate polling if not active | |
this.start(); | |
} | |
}); | |
}; | |
} | |
const asyncQueue = new AsyncQueue(); | |
export const asyncFoo1 = asyncQueue.wrap(ASYNC_CALLBACK_1); | |
export const asyncFoo2 = asyncQueue.wrap(ASYNC_CALLBACK_2); | |
export const asyncFoo3 = asyncQueue.wrap(ASYNC_CALLBACK_3); |
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