public ResourceEventPublisher(Storage <T> storage, EventClient messageClient, ILogger <ResourceEventPublisher <T> > logger)
{
EventHandler <T> publish(ResourceEventType type) => (sender, eventArgs) => messageClient.Publish(type, eventArgs);
var eventsToEmit = typeof(T).GetAttributeValue((EmitEventsAttribute attr) => attr.EventTypes);
if (eventsToEmit.Contains(ResourceEventType.Created))
{
storage.OnCreate += publish(ResourceEventType.Created);
}
if (eventsToEmit.Contains(ResourceEventType.Updated))
{
storage.OnUpdate += publish(ResourceEventType.Updated);
}
if (eventsToEmit.Contains(ResourceEventType.Deleted))
{
storage.OnDelete += publish(ResourceEventType.Deleted);
}
logger.LogDebug("Event publisher for resource {ResourceType} initialized. Emitting {EventTypes} events", typeof(T).Name, eventsToEmit);
}
public ResourceEventListener(ILogger <ResourceEventListener <T> > logger, EventClient messageClient)
{
// If type T is defined in the same service that's running
if (typeof(T).Assembly.GetName().Name.StartsWith(BlockInfo.Name))
{
logger.LogCritical("The resource {ResourceType} is defined in the same service as it's event listener. Please use the other constructor and supply a {StorageName} object", typeof(T), nameof(Storage <T>));
throw new ArgumentException($"Provide a {nameof(Storage<T>)} not a {nameof(EventClient)} for types defined in the same service");
}
messageClient.MessageReceived += (sender, args) =>
{
if (args.Resource?.GetType() == typeof(T))
{
logger.LogInformation("{EventType} event received for {Resource}", args.EventType, (T)args.Resource);
switch (args.EventType)
{
case ResourceEventType.Created when CreateIsOverride:
OnCreate(args.Resource);
break;
case ResourceEventType.Updated when UpdateIsOverride:
OnUpdate(args.Resource);
break;
case ResourceEventType.Deleted when DeleteIsOverride:
OnDelete(args.Resource);
break;
}
;
}
};
logger.LogDebug("External listener {ListenerName} initialized. Listening to {EventTypes} events", GetType().Name, ListeningTo());
}