Fault Tolerant Web Service Requests with Polly

By Bryan Hogan
Polly is a resilience framework for .Net. With Polly, your applications will easily handle transient failures and longer outages in remote web services. This course will teach you how to use all the major features of Polly.
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Course info
Rating
(95)
Level
Intermediate
Updated
Jan 4, 2018
Duration
2h 13m
Table of contents
Course Overview
Course Overview 2m
Learning the Basics of the Polly Framework
Introduction 1m Calling Remote Services 1m Course Overview 1m Why Web Service Requests Fail 1m Resilience Strategies - The Big Picture 0m Reactive Strategies - Responding to Problems 1m Proactive Strategies - Preventing Problems 1m Simple Demo of Polly Retries 3m Course Prerequisites 1m What is a Resilience Framework? 1m Using the Retry Policy 7m Polly Interfaces 1m Using the Wait and Retry Policy 3m Using Delegates to Do More with Policies 1m How to Perform Reauthorization with a Retry When Needed 4m Returning a Default When the Request Fails with the Fallback Policy 4m Handling the HttpClient Timeout 3m Setting Your Own Timeout with Polly Timeouts 1m Combining Timeouts, Retries, and Fallbacks 6m Summary 1m
Reusing Policies for Faster Development and More Robust Applications
Reusing with Dependency Injection and the Polly Registry 1m Code Demos 8m Comparison of Approaches and Summary 2m
Unit Testing Policies
Introduction to Unit Testing in Polly 2m Testing a Simple Policy 4m Testing the Polly Registry 2m Testing the Policy Holder 3m Summary 1m
Combining Policies to Protect Against Many Types of Failure
Introduction 1m Wrapping, What It Is, and Why You Would Do It 1m Building a Policy Wrap 6m Summary 0m
Improving Policy Execution with Information from the Caller
Introduction 0m The Context and Its Use 1m Writing the Policy and Populating the Context 3m Summary 1m
Caching for Faster Responses and Better Performance
Introduction to the Polly Cache 3m Working with the Polly Cache 8m Summary 1m
Failing and Recovering Quickly with the Circuit Breaker
How the Circuit Breaker Works 5m Using the Original Circuit Breaker 6m Using the Advanced Circuit Breaker 4m Summary 1m
Using the Bulkhead Policy to Keep Your Application Up
The Bulkhead Isolation Policy 5m The Bulkhead Isolation Policy in Action 4m Summary 1m
Polly in .NET Core 2.1 and the HttpClientFactory
Polly in .NET Core 2.1 and the HttpClientFactory 4m Using Polly with the HttpClientFactory 12m Summary 1m
Where Do We Go from Here?
The Future of Polly 3m
Description
Course info
Rating
(95)
Level
Intermediate
Updated
Jan 4, 2018
Duration
2h 13m
Description

Failures happen when calling remote services and handling these failures has never been easy. That was the case until the Polly project came along. Polly is a resilience framework for .Net. In this course, Fault Tolerant Web Service Requests with Polly, you will learn how to make your applications resilient to a wide range of failures and outages in remote services. First, you will learn to use the simple and very powerful retry policies. Next, you will see how to use some of the other policies offered by Polly like caching and fallback. You will also learn how to reuse policies across multiple applications and how to unit test everything. Finally, you will explore how to use the more advanced features of Polly - the circuit breaker and bulkhead isolation. By the end of the course, you will be able to use all the features of Polly to build robust applications that can tolerate short and long term outages in remote services.

About the author
Bryan Hogan
About the author

Bryan Hogan has been working in the tech industry for the past 17 years, 12 of which are the C# .NET world. He hosts a podcast, interviewing people from around the world and writes a blog.

Section Introduction Transcripts
Section Introduction Transcripts

Course Overview
Hello everyone, my name is Bryan Hogan. Welcome to my course, Fault Tolerant Web Service Requests with Polly. I am a software architect, podcaster, and blogger. I love learning new things, and I love talking about and writing about them. Polly is a resilience framework for .NET. When I started using Polly, I was blown away by what it could do and how easy it was to use. The Polly library has been downloaded over 2 million times and has an active developer community. Using Polly will make your web requests far more reliable and your applications much more stable. It does all of this with a minimal amount of code and is thread safe. You can use it with your .NET Core and Framework applications. In this course, I'm focusing on Polly and .NET Core 2 Web API applications, but almost everything I cover is applicable in Core 1 and Framework. I'm going to show you why web requests fail and why you need Polly. Then I'll get you coding with the simple, but super powerful Retry policy. I'll show you how to reuse your policies across multiple projects and applications and how to unit test your code before moving on to complex topics like caching, circuit breakers, and bulkhead isolation. By the end of this course, you will be able to use all the features of Polly to write rock-solid code, which not only keeps your application up, but also improves the performance and reliability of the services you call. Before beginning, you should be familiar with Web API and web services in general. I'll go through everything else you need to know. I hope you'll join me on this journey to learn Polly with the course Fault Tolerant Web Service Requests with Polly, at Pluralsight.

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