// create / update an event
// the system doesn't really distinguish between the two, just to keep the logic simple
// scenarios include changing the start or end date, changing the list of topics for that event, etc
public async Task Update(string title, string type, string start, string end, TopicApiData[] topics)
{
string id = this.GetPrimaryKeyString(); // rmember - the grain key is the event id
Console.WriteLine($"** EventGrain Update()for event id = {id}, with title {title}");
// update interal grain state
State.title = title;
State.type = type;
State.start = start;
State.end = end;
State.topics = topics;
State.feedback = new List <FeedbackGrainState>(); // lets clear all feedback, just to keep things simple
Console.WriteLine($"** EventGrain Update() about to write WriteStateAsync");
await base.WriteStateAsync();
// update aggregator about this new event
SummaryEventInfo eventInfo = new SummaryEventInfo();
eventInfo.id = id;
eventInfo.title = title;
eventInfo.start = start;
eventInfo.end = end;
IAggregatorGrain aggregator = GrainFactory.GetGrain <IAggregatorGrain>(Guid.Empty); // the aggregator grain is a singleton - Guid.Empty is convention to indicate this
//await aggregator.DeleteAnEvent(id);
await aggregator.AddAnEvent(eventInfo);
return;
}
