Subscribing to Service Fabric cluster level events - azure

Question

I am trying to create a service that will update an external list of Service Endpoints for applications running in my service fabric cluster. (Basically I need to replicate the Azure Load Balancer in my on premises F5 Load Balancer.)
During last month's Service Fabric Q&A, the team pointed me at RegisterServiceNotificationFilterAsync.
I made a stateless service using this method, and deployed it to my development cluster. I then made a new service by running the ASP.NET Core Stateless service template.
I expected that when I deployed the second service, the break point would hit in my first service, indicating that a service had been added. But no breakpoint was hit.
I have found very little in the way of examples for this kind of thing on the internet, so I am asking here hopping that someone else has done this and can tell me where I went wrong.
Here is the code for my service that is trying to catch the application changes:
protected override async Task RunAsync(CancellationToken cancellationToken)
{
var fabricClient = new FabricClient();
long? filterId = null;
try
{
var filterDescription = new ServiceNotificationFilterDescription
{
Name = new Uri("fabric:")
};
fabricClient.ServiceManager.ServiceNotificationFilterMatched += ServiceManager_ServiceNotificationFilterMatched;
filterId = await fabricClient.ServiceManager.RegisterServiceNotificationFilterAsync(filterDescription);
long iterations = 0;
while (true)
{
cancellationToken.ThrowIfCancellationRequested();
ServiceEventSource.Current.ServiceMessage(this.Context, "Working-{0}", ++iterations);
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken);
}
}
finally
{
if (filterId != null)
await fabricClient.ServiceManager.UnregisterServiceNotificationFilterAsync(filterId.Value);
}
}
private void ServiceManager_ServiceNotificationFilterMatched(object sender, EventArgs e)
{
Debug.WriteLine("Change Occured");
}
If you have any tips on how to get this going, I would love to see them.

Answer 1

You need to set the MatchNamePrefix to true, like this:
var filterDescription = new ServiceNotificationFilterDescription
{
Name = new Uri("fabric:"),
MatchNamePrefix = true
};
otherwise it will only match specific services. In my application I can catch cluster wide events when this parameter is set to true.