Question

Do Windows Workflow Services allow multiple clients to one service? Basically what I am trying to do is this: construct a WF service that allows clients to “subscribe to the service” and then when certain events trigger a handler, it broadcasts data to each client. So basically something is going to process in the background and then when the services receives, lets say a small string, it broadcasts that string to each client via callbacks.

So what I need to figure out first is if I have a service with a Subscription() method exposed to the world and if I have let’s say 3 clients call that method, store information about their callback endpoint and implementation to retain for future data “broadcasts”; can all of this happen in one WF service? If so, how do I reference my clients during broadcast callbacks?

Answer 1

I resolved this by saving implementing callback services in the client. On the actual service I have subscribe() and unsubscribe() service methods that take in the clients endpoint URI as one of the parameters. After some authentication on other parameters, the URI is saved to a client pool collection. To do multicasts back to all clients, I iterate through URI collection and perform callbacks for each URI.