| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| export const defaultThrottleConfig = { |
| leading: true, |
| trailing: false |
| }; |
| export function throttle(durationSelector, config = defaultThrottleConfig) { |
| return (source) => source.lift(new ThrottleOperator(durationSelector, config.leading, config.trailing)); |
| } |
| class ThrottleOperator { |
| constructor(durationSelector, leading, trailing) { |
| this.durationSelector = durationSelector; |
| this.leading = leading; |
| this.trailing = trailing; |
| } |
| call(subscriber, source) { |
| return source.subscribe(new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing)); |
| } |
| } |
| class ThrottleSubscriber extends OuterSubscriber { |
| constructor(destination, durationSelector, _leading, _trailing) { |
| super(destination); |
| this.destination = destination; |
| this.durationSelector = durationSelector; |
| this._leading = _leading; |
| this._trailing = _trailing; |
| this._hasValue = false; |
| } |
| _next(value) { |
| this._hasValue = true; |
| this._sendValue = value; |
| if (!this._throttled) { |
| if (this._leading) { |
| this.send(); |
| } |
| else { |
| this.throttle(value); |
| } |
| } |
| } |
| send() { |
| const { _hasValue, _sendValue } = this; |
| if (_hasValue) { |
| this.destination.next(_sendValue); |
| this.throttle(_sendValue); |
| } |
| this._hasValue = false; |
| this._sendValue = null; |
| } |
| throttle(value) { |
| const duration = this.tryDurationSelector(value); |
| if (!!duration) { |
| this.add(this._throttled = subscribeToResult(this, duration)); |
| } |
| } |
| tryDurationSelector(value) { |
| try { |
| return this.durationSelector(value); |
| } |
| catch (err) { |
| this.destination.error(err); |
| return null; |
| } |
| } |
| throttlingDone() { |
| const { _throttled, _trailing } = this; |
| if (_throttled) { |
| _throttled.unsubscribe(); |
| } |
| this._throttled = null; |
| if (_trailing) { |
| this.send(); |
| } |
| } |
| notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| this.throttlingDone(); |
| } |
| notifyComplete() { |
| this.throttlingDone(); |
| } |
| } |
| //# sourceMappingURL=throttle.js.map |