3rd Party Libraries and Contributions

xUnit.net - Free, open source, community-focused unit testing tool for the .NET Framework | Apache License 2.0 (Apache)
Ian Griffith's TimedLock
Steven van Deursen's ReadOnlyDictionary (until Polly v5.0.6)
Stephen Cleary's AsyncEx library for AsyncSemaphore (supports BulkheadAsync policy for .NET 4.0 only) (until Polly v5.9.0) | MIT license
@theraot's ExceptionDispatchInfo implementation for .NET 4.0 (supports Timeout policy for .NET4.0 only) (until Polly v5.9.0) including also a contribution by @migueldeicaza | Licensed under and distributed under Creative Commons Attribution Share Alike license per StackExchange Terms of Service
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Acknowledgements

lokad-shared-libraries - Helper assemblies originally for .NET 3.5 and Silverlight 2.0 which were developed as part of the Open Source effort by Lokad.com (discontinued) | New BSD License
@michael-wolfenden - The creator and mastermind of Polly!
@ghuntley - Portable Class Library implementation.
@mauricedb - Initial async implementation.
@robgibbens - Added existing async files to PCL project
Hacko - Added extra NotOnCapturedContext call to prevent potential deadlocks when blocking on asynchronous calls
@ThomasMentzel - Added ability to capture the results of executing a policy via ExecuteAndCapture
@yevhen - Added full control of whether to continue on captured synchronization context or not
@reisenberger - Added full async cancellation support
@reisenberger - Added async support for ContextualPolicy
@reisenberger - Added ContextualPolicy support for circuit-breaker
@reisenberger - Extended circuit-breaker for public monitoring and control
@reisenberger - Added ExecuteAndCapture support with arbitrary context data
@kristianhald and @reisenberger - Added AdvancedCircuitBreaker
@reisenberger - Allowed async onRetry delegates to async retry policies
@Lumirris - Add new Polly.Net40Async project/package supporting async for .NET 4.0 via Microsoft.Bcl.Async
@SteveCote - Added overloads to WaitAndRetry{Async} methods that accept an onRetry delegate which includes the attempt count.
@reisenberger - Allowed policies to handle returned results; added strongly-typed policies Policy<TResult>.
@christopherbahr - Added optimisation for circuit-breaker hot path.
@Finity - Fixed circuit-breaker threshold bug.
@reisenberger - Add some missing ExecuteAndCapture{Async} overloads.
@brunolauze - Add CancellationToken support to synchronous executions (to support TimeoutPolicy).
@reisenberger - Add PolicyWrap.
@reisenberger - Add Fallback policy.
@reisenberger - Add PolicyKeys and context to all policy executions, as bedrock for policy events and metrics tracking executions.
@reisenberger, and contributions from @brunolauze - Add Bulkhead Isolation policy.
@reisenberger - Add Timeout policy.
@reisenberger - Fix .NET Standard 1.0 targeting. Remove PCL259 target. PCL259 support is provided via .NET Standard 1.0 target, going forward.
@reisenberger - Fix CircuitBreaker HalfOpen state and cases when breakDuration is shorter than typical call timeout. Thanks to @vgouw and @kharos for the reports and insightful thinking.
@lakario - Tidy CircuitBreaker LastException property.
@lakario - Add NoOpPolicy.
@Julien-Mialon - Fixes, support and examples for .NET Standard compatibility with Xamarin PCL projects
@reisenberger - Add mutable Context and extra overloads taking Context. Allows different parts of a policy execution to exchange data via the mutable Context travelling with each execution.
@ankitbko - Add PolicyRegistry for storing and retrieving policies.
@reisenberger - Add interfaces by policy type and execution type.
@seanfarrow - Add IReadOnlyPolicyRegistry interface.
@kesmy - Migrate solution to msbuild15, banish project.json and packages.config
@hambudi - Ensure sync TimeoutPolicy with TimeoutStrategy.Pessimistic rethrows delegate exceptions without additional AggregateException.
@jiimaho and @Extremo75 - Provide public factory methods for PolicyResult, to support testing.
@Extremo75 - Allow fallback delegates to take handled fault as input parameter.
@reisenberger and @seanfarrow - Add CachePolicy, with interfaces for pluggable cache providers and serializers.
Thanks to the awesome devs at @tretton37 who delivered the following as part of a one-day in-company hackathon led by @reisenberger, sponsored by @tretton37 and convened by @thecodejunkie
- @matst80 - Allow WaitAndRetry to take handled fault as an input to the sleepDurationProvider, allowing WaitAndRetry to take account of systems which specify a duration to wait as part of a fault response; e.g. Azure CosmosDB may specify this in x-ms-retry-after-ms headers or in a property to an exception thrown by the Azure CosmosDB SDK.
- @MartinSStewart - Add GetPolicies() extension methods to IPolicyWrap.
- @jbergens37 - Parallelize test running where possible, to improve overall build speed.
@reisenberger - Add new .HandleInner<TException>(...) syntax for handling inner exceptions natively.
@rjongeneelen and @reisenberger - Allow PolicyWrap configuration to configure policies via interfaces.
@reisenberger - Performance improvements.
@awarrenlove - Add ability to calculate cache TTL based on item to cache.
@erickhouse - Add a new onBreak overload that provides the prior state on a transition to an open state.
@benagain - Bug fix: RelativeTtl in CachePolicy now always returns a ttl relative to time item is cached.
@urig - Allow TimeoutPolicy to be configured with Timeout.InfiniteTimeSpan.
@reisenberger - Integration with IHttpClientFactory for ASP.NET Core 2.1.
@freakazoid182 - WaitAndRetry{Forever} overloads where onRetry takes the retry number as a parameter.
@dustyhoppe - Overloads where onTimeout takes thrown exception as a parameter.
@flin-zap - Catch missing async continuation control.
@reisenberger - Clarify separation of sync and async policies.
@reisenberger - Enable extensibility by custom policies hosted external to Polly.
@seanfarrow - Enable collection initialization syntax for PolicyRegistry.
@moerwald - Code clean-ups, usage of more concise C# members.
@cmeeren - Enable cache policies to cache values of default(TResult).
@aprooks - Build script tweaks for Mac and Mono.
@kesmy - Add SourceLink support, clean up cake build.
@simluk - Fix continueOnCaptureContext not being honored in async retry implementation (bug in v7.1.0 only).
@jnyrup - Upgrade tests to Fluent Assertions v5.9.0
@SimonCropp - Add netcoreapp3.0 target; code clean-ups.
@aerotog and @reisenberger - IConcurrentPolicyRegistry methods on PolicyRegistry
@reisenberger and @martincostello - Add RateLimit policy.