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node_modules/rxjs/_esm2015/internal/operators/throttle.js

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+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