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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758import { abortError, throwIfAborted } from '../../lib/abort'
type WaitingRequest = { signal?: AbortSignal start: () => void reject: (error: unknown) => void}
export class RequestScheduler { private active = 0 private readonly waiting: WaitingRequest[] = []
constructor(private readonly limit: number) {}
run<T>(operation: () => Promise<T>, signal?: AbortSignal): Promise<T> { throwIfAborted(signal) return new Promise<T>((resolve, reject) => { const cancelQueuedRequest = () => { const index = this.waiting.indexOf(request) if (index < 0) return this.waiting.splice(index, 1) reject(abortError(signal)) } const request: WaitingRequest = { signal, reject, start: () => { signal?.removeEventListener('abort', cancelQueuedRequest) this.active += 1 Promise.resolve() .then(operation) .then(resolve, reject) .finally(() => { this.active -= 1 this.startNext() }) }, } if (this.active < this.limit) request.start() else { this.waiting.push(request) signal?.addEventListener('abort', cancelQueuedRequest, { once: true }) } }) }
private startNext(): void { while (this.active < this.limit && this.waiting.length > 0) { const request = this.waiting.shift()! if (request.signal?.aborted) request.reject(abortError(request.signal)) else request.start() } }}
export const hydrationRequests = new RequestScheduler(6)export const paginationRequests = new RequestScheduler(2)