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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | 1x 1x 1x 1x 1x 1x 1x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 5x 1x 1x 4x 5x 5x 4x 4x 4x 5x 4x 4x 5x 1x 1x 4x 4x 4x 4x 4x 2x 2x 4x 4x 4x 4x 4x 7x 4x 4x 4x 7x 4x 4x 4x 4x 4x 1x 1x 1x 2x 2x 2x 1x | export enum ChannelState { EMPTY = 0, RECEIVER, DATA, CLOSED, } export class Channel<T> implements AsyncIterable<T> { private state: ChannelState = ChannelState.EMPTY; private dataQueue: T[] = []; private receiverQueue: ((value: T) => void)[] = []; get State(): ChannelState { return this.state; } send(data: T): void { if (this.state === ChannelState.CLOSED) { throw new ChannelError("Channel is closed"); } if (this.state === ChannelState.RECEIVER) { const receiver = this.receiverQueue.shift(); if (receiver) { receiver(data); if (this.receiverQueue.length === 0) { this.state = ChannelState.EMPTY; } } else { this.dataQueue.push(data); this.state = ChannelState.DATA; } } else { this.dataQueue.push(data); this.state = ChannelState.DATA; } } async receive(): Promise<T> { if (this.state === ChannelState.CLOSED) { throw new ChannelError("Channel is closed"); } if (this.state === ChannelState.DATA) { const data = this.dataQueue.shift(); if (data !== undefined) { if (this.dataQueue.length === 0) { this.state = ChannelState.EMPTY; } return data; } } return new Promise<T>((resolve, reject) => { this.receiverQueue.push(resolve); this.state = ChannelState.RECEIVER; }); } close(): void { if (this.state !== ChannelState.CLOSED) { this.state = ChannelState.CLOSED; while (this.receiverQueue.length > 0) { this.receiverQueue.shift(); } } } [Symbol.asyncIterator](): AsyncIterator<T> { return this; } async next(): Promise<IteratorResult<T, any>> { try { const value = await this.receive(); return { value, done: false }; } catch { this.close(); return { value: undefined, done: true }; } } } class ChannelError extends Error { constructor(message: string) { super(message); this.name = "ChannelError"; } } |