Book Image

Distributed .NET with Microsoft Orleans

By : Bhupesh Guptha Muthiyalu, Suneel Kumar Kunani
Book Image

Distributed .NET with Microsoft Orleans

By: Bhupesh Guptha Muthiyalu, Suneel Kumar Kunani

Overview of this book

Building distributed applications in this modern era can be a tedious task as customers expect high availability, high performance, and improved resilience. With the help of this book, you'll discover how you can harness the power of Microsoft Orleans to build impressive distributed applications. Distributed .NET with Microsoft Orleans will demonstrate how to leverage Orleans to build highly scalable distributed applications step by step in the least possible time and with minimum effort. You'll explore some of the key concepts of Microsoft Orleans, including the Orleans programming model, runtime, virtual actors, hosting, and deployment. As you advance, you'll become well-versed with important Orleans assets such as grains, silos, timers, and persistence. Throughout the book, you'll create a distributed application by adding key components to the application as you progress through each chapter and explore them in detail. By the end of this book, you'll have developed the confidence and skills required to build distributed applications using Microsoft Orleans and deploy them in Microsoft Azure.
Table of Contents (17 chapters)
1
Section 1 - Distributed Applications Architecture
4
Section 2 - Working with Microsoft Orleans
10
Section 3 - Building Patterns in Orleans
13
Section 4 - Hosting and Deploying Orleans Applications to Azure

Understanding and implementing notifications

There are several scenarios in the real world where clients need to receive asynchronous notifications. For example, when a check-in happens, the available room count reduces, and we need to notify all clients who might have enabled booking for our hotel on their sites to show current availability. Orleans provides a feature called client observers that helps to notify clients asynchronously. Let's configure and implement notifications in the next sub-section.

Implementing notifications in a grain

The mechanisms that allow a grain to notify clients asynchronously are called observers. An observer is an interface that inherits from IGrainObserver and the client implementing IObserver is called client observers. The grain will provide an API to subscribe or unsubscribe observers and send notifications to subscribed observers. Let's implement observer notifications step by step.

Step 1: Configuring the client to receive notifications...