Book Image

Learning Azure Cosmos DB

By : Shahid Shaikh
Book Image

Learning Azure Cosmos DB

By: Shahid Shaikh

Overview of this book

<p>Microsoft has introduced a new globally distributed database, called Azure Cosmos DB. It is a superset of Microsoft's existing NoSQL Document DB service. Azure Cosmos DB enables you to scale throughput and storage elastically and independently across any number of Azure's geographic regions.</p> <p>This book is a must-have for anyone who wants to get introduced to the world of Cosmos DB. This book will focus on building globally-distributed applications without the hassle of complex, multiple datacenter configurations. This book will shed light on how Cosmos DB offers multimodal NoSQL database capabilities in the cloud at a scale that is one product with different database engines, such as key-value, document, graph, and wide column store. We will cover detailed practical examples on how to create a CRUD application using Cosmos DB with a frontend framework of your choice. This book will empower developers to choose their favorite database engines to perform integration, along with other systems that utilize the most popular languages, such as Node.js. This book will take you through the tips and trick, of Cosmos DB deployment, management, and the security offered by Azure Cosmos DB in order to detect, prevent, and respond to database breaches.</p> <p>By the end of this book, you will not only be aware of the best capabilities of relational and non-relational databases, but you will also be able to build scalable, globally distributed,<br />and highly responsive applications.</p>
Table of Contents (14 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Encoding URL algorithms


This is the interesting part where the actual URL encoding and decoding happens.

Before we jump into the code development, let's explore the basic theory behind URL shortening. Our requirement is as follows:

Given a long URL such as http://stackoverflow.com/questions/tagged/node.js, generate a unique URL that is shorter, such as localhost:3000/3Ys.

First, let's look at actually generating a unique key from our original URL, in this case 3 years, which is at the end of our localhost URL.

To satisfy the uniqueness requirement, we can use a special class of functions called bijective (https://en.wikipedia.org/wiki/Bijection) functions, which guarantee a 1-to-1 mapping. For explanation purposes, a bijective function basically says:

"A decoded URL is mapped to exactly one key, and a key is mapped to exactly one decoded URL"

We are going to use a base58 algorithm to fulfil our URL shortening and decoding task.

We are going to convert a unique integer ID (which is in base10) to...