[FEATURE REQ] Cancellation support for client.ReceiveAsync()

Is your feature request related to a problem? Please describe.

Azure Service Bus is using long-polling to retrieve messages. That means user code has to wait for command execution before an endpoint can shut down. With asynchronous libraries, it’s a common theme and a recommended practice to pass a CancellationToken to invoke earlier termination of work.

Describe the solution you’d like

1. Add support for CancellationToken to ReceiveAsync()
2. Consider a review of the client to support cancellation pattern throughout various APIs (ReceiveAsync(), SendAsync(), AcceptMessageSessionAsync(), etc).

Describe alternatives you’ve considered

For the context, here’s the original issue from the client’s previous repository: https://github.com/Azure/azure-service-bus-dotnet/issues/439#issuecomment-423770087

[SeanFeldman]

@axisc closing public issues in favour of an internal backlog is not a good idea. Please keep public issues open and close when the internal issues are completed.

[jfggdl]

Thanks for your feedback. We will keep this issue open and will update it once we have any news about the candidate feature to implement token cancellation support.