public EventHandle Subscribe(string eventName, Action <Frame> handler)
{
var eventHandlers = _handlers.AddOrUpdate(eventName, new ConcurrentDictionary <EventHandle, Action <Frame> >(), (k, v) => v);
var handle = new EventHandle(eventName);
eventHandlers.TryAdd(handle, handler);
return(handle);
}
public Task <Frame> GetFrame(string name)
{
var promise = new TaskCompletionSource <Frame>();
EventHandle handle = null;
handle = Subscribe(name, frame =>
{
Unsubscribe(handle);
promise.TrySetResult(frame);
});
if (this._frames.ContainsKey(name))
{
Unsubscribe(handle);
promise.TrySetResult(this._frames[name]);
}
return(promise.Task);
}
public void Unsubscribe(EventHandle handle)
{
var eventHandlers = _handlers.AddOrUpdate(handle.EventName, new ConcurrentDictionary <EventHandle, Action <Frame> >(), (k, v) => v);
eventHandlers.TryRemove(handle, out Action <Frame> action);
}