From f4e633beb4faebe1eaced7ea64f3903ecc57f08b Mon Sep 17 00:00:00 2001
From: Bruno Windels <274386+bwindels@users.noreply.github.com>
Date: Mon, 26 Sep 2022 15:24:14 +0200
Subject: [PATCH] support onfirstsubscribe callback in ROV

will use it to start polling for turnServer updates
---
 src/observable/value/RetainedObservableValue.ts | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/observable/value/RetainedObservableValue.ts b/src/observable/value/RetainedObservableValue.ts
index edfb6c15..16058f8e 100644
--- a/src/observable/value/RetainedObservableValue.ts
+++ b/src/observable/value/RetainedObservableValue.ts
@@ -17,15 +17,17 @@ limitations under the License.
 import {ObservableValue} from "./ObservableValue";
 
 export class RetainedObservableValue<T> extends ObservableValue<T> {
-    private _freeCallback: () => void;
 
-    constructor(initialValue: T, freeCallback: () => void) {
+    constructor(initialValue: T, private freeCallback: () => void, private startCallback: () => void = () => {}) {
         super(initialValue);
-        this._freeCallback = freeCallback;
+    }
+
+    onSubscribeFirst() {
+        this.startCallback();
     }
 
     onUnsubscribeLast() {
         super.onUnsubscribeLast();
-        this._freeCallback();
+        this.freeCallback();
     }
 }