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Original file line number Diff line number Diff line change
Expand Up @@ -61,9 +61,15 @@ private HeadlessJsTaskContext(ReactContext reactContext) {
mReactContext = new WeakReference<ReactContext>(reactContext);
}

/** Register a task lifecycle event listener. */
public void addTaskEventListener(HeadlessJsTaskEventListener listener) {
/**
* Register a task lifecycle event listener. Synchronized in order to prevent race conditions
* with finishTask, as the listener will be invoked for already running tasks.
*/
public synchronized void addTaskEventListener(HeadlessJsTaskEventListener listener) {
mHeadlessJsTaskEventListeners.add(listener);
for (Integer activeTaskId: mActiveTasks) {
listener.onHeadlessJsTaskStart(activeTaskId);
}
}

/** Unregister a task lifecycle event listener. */
Expand Down