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support onfirstsubscribe callback in ROV
will use it to start polling for turnServer updates
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@ -17,15 +17,17 @@ limitations under the License.
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import {ObservableValue} from "./ObservableValue";
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export class RetainedObservableValue<T> extends ObservableValue<T> {
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private _freeCallback: () => void;
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constructor(initialValue: T, freeCallback: () => void) {
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constructor(initialValue: T, private freeCallback: () => void, private startCallback: () => void = () => {}) {
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super(initialValue);
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this._freeCallback = freeCallback;
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}
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onSubscribeFirst() {
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this.startCallback();
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}
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onUnsubscribeLast() {
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super.onUnsubscribeLast();
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this._freeCallback();
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this.freeCallback();
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}
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}
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