Hands-On Serverless Applications with Kotlin

封面

Title Page

Copyright and Credits

Hands-On Serverless Applications with Kotlin

Packt Upsell

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Contributors

About the authors

About the reviewer

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Preface

Introduction

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Conventions used

Get in touch

Reviews

Basics of Serverless

What is serverless computing?

The evolution of serverless computing

On-premise

Colocation providers

Virtualization and IaaS

PaaS

BaaS

SaaS

FaaS

Serverless computing

Serverless – the time is now

Diving into serverless computing with a use case

A review of serverless computing

Comparing and contrasting traditional and serverless paradigms

The case study of an application

The architecture of the system using traditional methods

The architecture of the system using the serverless paradigm

Traditional versus serverless in a nutshell

Pros and cons of serverless

Advantages of serverless systems

Reduced operational costs

Optimized resource utilization

Faster time to market

High-development velocity and laser-sharp focus on authoring code

Promoting a microservices architecture

The drawbacks of serverless systems

Nascent ecosystem

Yielding of control

Opinionated offerings

Provider limits

Standardized and provider-agnostic offerings

Tooling

Competition from containers

Rethinking serverless

An absence of local states

Applying modern software development practices

Time-boxed execution

Startup latency

Testability

Debugging

The serverless computing ecosystem

Serverless computers and infrastructure providers

AWS Lambda

IBM OpenWhisk

Microsoft Azure Cloud Functions

Google Cloud Functions

Auth0 Webtasks

Others

Serverless toolkits

Summary

AWS Serverless Offerings

AWS Lambda overview

Execution environment

Service limits

Invocation types

Custom invocation via AWS CLI or embedded AWS SDK in an application

Event sources from other AWS Services

Execution environments/runtimes

Handler

Context

Logging

Exceptions and error handling

Storing the state

JVM execution environment

Handlers in Java

Context object

Logging

Error handling

A case study of a simple Java Lambda function

Creating the Lambda function

Lambda dashboard

Basics of creation

Configuring the Lambda function

Writing a Lambda function

Deploying the Lambda function

Testing a Lambda function

Case study of a simple Kotlin Lambda function

Tooling

Anatomy of a Kotlin Lambda function