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adds support for flowable to async iterable conversion
Signed-off-by: Oleh Dokuka <[email protected]>
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@@ -28,4 +28,4 @@ suppress_type=$FlowFixMe | |
| suppress_type=$FixMe | ||
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| [version] | ||
| ^0.134.0 | ||
| ^0.136.0 | ||
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| @@ -0,0 +1,153 @@ | ||
| /** Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * @flow | ||
| */ | ||
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| 'use strict'; | ||
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| import type {ISubscriber, ISubscription} from 'rsocket-types'; | ||
| import Flowable from './Flowable'; | ||
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| // $FlowFixMe | ||
| export default class FlowableAsyncIterable<T> implements AsyncIterable<T> { | ||
| _source: Flowable<T>; | ||
| _prefetch: number; | ||
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| constructor(source: Flowable<T>, prefetch: number = 256) { | ||
| this._source = source; | ||
| this._prefetch = prefetch; | ||
| } | ||
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| asyncIterator(): AsyncIterator<T> { | ||
| const asyncIteratorSubscriber = new AsyncIteratorSubscriber(this._prefetch); | ||
| this._source.subscribe(asyncIteratorSubscriber); | ||
| return asyncIteratorSubscriber; | ||
| } | ||
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| // $FlowFixMe | ||
| [Symbol.asyncIterator](): AsyncIterator<T> { | ||
| return this.asyncIterator(); | ||
| } | ||
| } | ||
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| // $FlowFixMe | ||
| class AsyncIteratorSubscriber<T> implements ISubscriber<T>, AsyncIterator<T> { | ||
| _values: T[]; | ||
| _prefetch: number; | ||
| _limit: number; | ||
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| _subscription: ISubscription; | ||
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| _produced: number; | ||
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| _done: boolean; | ||
| _error: Error; | ||
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| _resolve: ?( | ||
| result: Promise<IteratorResult<T, void>> | IteratorResult<T, void>, | ||
| ) => void; | ||
| _reject: ?(reason?: any) => void; | ||
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| constructor(prefetch: number = 256) { | ||
| this._prefetch = prefetch; | ||
| this._values = []; | ||
| this._limit = | ||
| prefetch === Number.MAX_SAFE_INTEGER | ||
| ? Number.MAX_SAFE_INTEGER | ||
| : prefetch - (prefetch >> 2); | ||
| this._produced = 0; | ||
| } | ||
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| onSubscribe(subscription: ISubscription): void { | ||
| this._subscription = subscription; | ||
| subscription.request(this._prefetch); | ||
| } | ||
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| onNext(value: T): void { | ||
| const resolve = this._resolve; | ||
| if (resolve) { | ||
| this._resolve = undefined; | ||
| this._reject = undefined; | ||
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| if (++this._produced === this._limit) { | ||
| this._produced = 0; | ||
| this._subscription.request(this._limit); | ||
| } | ||
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| resolve({done: false, value}); | ||
| return; | ||
| } | ||
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| this._values.push(value); | ||
| } | ||
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| onComplete(): void { | ||
| this._done = true; | ||
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| const resolve = this._resolve; | ||
| if (resolve) { | ||
| this._resolve = undefined; | ||
| this._reject = undefined; | ||
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| resolve({done: true}); | ||
| } | ||
| } | ||
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| onError(error: Error): void { | ||
| this._done = true; | ||
| this._error = error; | ||
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| const reject = this._reject; | ||
| if (reject) { | ||
| this._resolve = undefined; | ||
| this._reject = undefined; | ||
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| reject(error); | ||
| } | ||
| } | ||
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| next(): Promise<IteratorResult<T, void>> { | ||
| const value = this._values.shift(); | ||
| if (value) { | ||
| if (++this._produced === this._limit) { | ||
| this._produced = 0; | ||
| this._subscription.request(this._limit); | ||
| } | ||
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| return Promise.resolve({done: false, value}); | ||
| } else if (this._done) { | ||
| if (this._error) { | ||
| return Promise.reject(this._error); | ||
| } else { | ||
| return Promise.resolve({done: true}); | ||
| } | ||
| } else { | ||
| return new Promise((resolve, reject) => { | ||
| this._resolve = resolve; | ||
| this._reject = reject; | ||
| }); | ||
| } | ||
| } | ||
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| return(): Promise<IteratorResult<T, void>> { | ||
| this._subscription.cancel(); | ||
| return Promise.resolve({done: true}); | ||
| } | ||
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| // $FlowFixMe | ||
| [Symbol.asyncIterator](): AsyncIterator<T> { | ||
| return this; | ||
| } | ||
| } |
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