Provides sample implementations using the Polly library. The intent of this project is to help newcomers kick-start their use of Polly within their own projects.
- The demos run against an example 'faulting server' (also within the solution). To simulate failure, this dummy server rejects more than 3 calls from the same IP in any five-second period.
- Be sure to read the
<summary/>at the top of each demo: this explains the intent of that demo, and what it achieves (in relation to the dummy 'faulting server'). - Sometimes the
<summary/>also highlights what this demo doesn't achieve - often picked up in the following demo. Explore the demos in sequence, for best understanding.
- Demo 00 shows behaviour calling the faulting server every half-second, with no Polly policies protecting the call.
- Demos 01-04 show various flavors of Polly retry.
- Demos 05-06 show retry combined with Circuit-Breaker.
- Demo 07 shows the Polly v5.0
PolicyWrapfor combining Retry and CircuitBreaker. - Demo 08 adds Polly v5.0
Fallback, making the call protected (in a PolicyWrap) by a Fallback, Retry, Circuitbreaker. - Demo 09 shows the Polly v5.0
Timeoutpolicy for an overall call timeout, in combination withFallbackandWaitAndRetry.
- To start the dummy server, start
PollyTestApp. - Be sure the port number for the dummy server in
PollyTestClient\Configuration.csmatches the port on whichPollyTestApphas started on your machine (in the previous step). - To run a demo, uncomment the demo you wish to run in
PollyTestClient\program.cs. Then startPollyTestClient.
- Any questions about the operation of the demos, ask on this repo; any questions about Polly, ask at Polly.
- For full Polly syntax, see Polly.
- For deeper discussions of transient fault-handling and further Polly patterns, see the Polly wiki
View the slides presented at the April 2016 DevIntersections Polly demo by Carl Franklin.