Polly usage example - Separate Circuit Breakers per domain

This sample project was put together based on the following SO question.

Problem (in short)

• How to define separate circuit breaker policies for different domains?
• NOTE: For a single domain use the Circuit Breaker as a shared policy.

Design

Option A

Use IDictionary or IConcurrentPolicyRegistry collections to store policies per domain

Pro

The implementation is simple, you have to populate a collection and look up the appropriate policy whenever needed

Con

You have to explicitly call the retrieved policy's ExecuteAsync

Option B

Use named typed clients and decorate them with Circuit Breakers

Pro

The policy usage is done implicitly on your behalf

Con

The setup part is a bit more complex compared to Option A

Solution

This sample project shows how to implement Option B

• Clients folder contains the definition of the typed client (interface + dummy implementation)
• Program.cs contains the policy definitions and the registration of the named and typed clients
• SampleController.cs shows the usage of the named and typed clients