Building applications with Scala 无水印pdf.pdf

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Table of Contents

About the Author

Preface

1. Introduction to FP, Reactive, and Scala

Functional programming

Principles of functional programming

Immutability

Disciplined state

Pure functions and no side effects

First-class functions and higher-order functions

Type systems

Referential transparency

Installing Java 8 and Scala 2.11

Read Eval Print and Loop - REPL

Scala Hello World using the REPL

Scala REPL Hello World program

Scala object-oriented HelloWorld program

Scala HelloWorld App in the Scala REPL

Java HelloWorld application

Scala language - the basics

Scala variables - var and val

Scala REPL var usage

Scala val usage at the Scala REPL

Creating immutable variables

Scala variable type in the Scala REPL

Scala variables with explicit typing at the Scala REPL

Scala conditional and loops statements

If statements in Scala REPL

If statements in return statements in Scala REPL

Basic for loop in Scala REPL

For with List in Scala REPL

For with if statements for filtering - Scala REPL

Java code for filtering even numbers

For comprehensions

For comprehension in Scala REPL

Java code for performing filtering with collections

Scala collections

Creating, removing, and getting an item from a mutable list in Scala REPL

Scala tuples

Scala immutable Map in Scala REPL

Scala mutable Maps at Scala REPL

Monads

Scala Map function in Scala REPL

Option Monad in Scala

A list of all methods using the Scala REPL

Scala class, traits, and OO programming

A simple Scala class in Scala REPL

Scala plain old Java object in Scala REPL

Person class in Java

Traits and inheritance

Scala inheritance code in Scala REPL

Scala traits sample code in Scala REPL

Scala traits using variable mixing technique at Scala REPL

Scala type alias sample in Scala REPL

Case classes

Scala case classes feature in Scala REPL

Pattern Matcher

Simple Pattern Matcher in Scala

Advanced pattern matcher in Scala REPL

Advanced complex pattern matcher in Scala REPL

Partial functions

Simple Partial function in Scala REPL

Scala PartialFunction without OO using case statements in Scala REPL

PartialFunction composition in Scala REPL

Package objects

package.scala

MainApp.scala

Functions

Partial application

Partial function in Scala REPL

Curried functions

Curried functions - Scala REPL

Curried transformation in Scala REPL

Operator overloading

Scala operator overloading in Scala REPL

Implicits

Scala Implicits in SCALA REPL

Implicit Parameter at Scala REPL

Futures

Simple Future code in Scala REPL

A complete Future sample at Scala REPL

Reactive Programing and RxScala

Simple Observables Scala with RxScala

Simple Observables Scala with RxScala - Execution in the console

Complex Scala with RxScala Observables

Summary

2. Creating Your App Architecture and Bootstrapping with SBT

Introducing SBT

Installing SBT on Ubuntu Linux

Getting started with SBT

Adding dependencies

Generating Eclipse project files from SBT

Application distribution

Hello world SBT / Scala App

Bootstrapping our Play framework app with Activator

Activator shell

Activator - compiling, testing, and running

Summary

3. Developing the UI with Play Framework

Getting started

Creating our models

Creating routes

Creating our controllers

Working with services

Configuring the Guice module

Working with views(UI)

Summary

4. Developing Reactive Backing Services

Getting started with reactive programming

IPriceService - Scala trait

PriceService - RxScala PriceService implementation

Guice Injection - Module.scala

NGServiceEndpoint

Play framework and high CPU usage

RndDoubleGeneratorController

IRndService.scala - Scala trait

RndService.scala - RndService implementation

Module.scala - Guice Injections

main.scala.html

product_details.scala.html

Summary

5. Testing Your Application

Unit testing principles

Making code testable

Isolation and self-contained tests

Effective naming

Levels of testing

Testing with Junit

Behavior-Driven Development - BDD

MyFirstPlaySpec.scala - First BDD with ScalaTest and the Play framework

Testing with Play framework support

ProductService.scala - FIX the code issue

ImageServiceTestSpec.scala - ImageService Test

ReviewServiceTestSpec.scala - ReviewService test

Testing routes

RoutesTestingSpec.scala - Play framework route testing

Controller testing

RndDoubleGeneratorControllerTestSpec.scala - RndDoubleGeneratorController tests

IntegrationSpec.scala

ProductControllerTestSpec.scala

product_index.scala.html

ImageControllerTestSpec.scala

image_index.scala.html

ReviewControllerTestSpec.scala

review_index.scala.html

ApplicationSpec.scala

NGServiceImplTestSpec.scala

NGServiceEndpointControllerTest.scala

Summary

6. Persistence with Slick

Introducing the Slick framework

MySQL setup

Configuring Slick in our Play framework app

Configure the database connection

FPM Mapping

ProductDao

ReviewDAO

ImageDao

Slick evolutions

Refactoring services

Refactoring controllers

Configuring DAO packages in Guice

Refactoring tests

Generic mocks

Service tests

Controller tests

Running the application

Summary

7. Creating Reports

Introducing JasperReports

JasperReports workflow

Jasper sessions

Installing Jaspersoft Studio 6

Configuring MySQL Data Adapter in Jaspersoft Studio

Creating a product report

Creating a review report

Creating an image report

Integrating JasperReports with Play framework

build.sbt

Generic report builder

Adding the report to the product controller

Adding the report to the review controller

Adding the report to the image controller

Routes - adding new report routes

New centralized reports UI

Adding the report button for each view

Summary

8. Developing a Chat with Akka

Adding the new UI introduction to Akka

Introduction to the Actor model

What is an Actor?

Message exchange and mailboxes

Coding actors with Akka

Actor routing

Persistence

Creating our chat application

The chat protocol

The chat controller

Implementing the chat controller

Configuring the routes

Working on the UI

Adding Akka tests

Scala test for Akka Actor

Chat room Actor test

Chat Bot Admin Actor test

Summary

9. Design Your REST API

Introduction to REST

REST API design

HTTP verbs design

Uniform API

Response with HTTP status codes

REST API patterns

API versioning

Some anti-patterns to be avoided

Creating our API with REST and JSON

RestApiContoller

REST API Front Controller implementation

JSON mapping

Configuring new routes

Testing the API using the browser

Creating a Scala client

Configuring plugins.sbt

Configuring build.sbt

Scala client code

Creating our REST client proxies

Creating ScalaTest tests for the proxies

Adding back pressure

The leaky bucket algorithm

Scala leaky bucket implementation

Testing back pressure

Adding Swagger support

Swagger UI

Build and install Swagger Standalone

Summary

10. Scaling up

Standalone deploy

Reports folder

Changing report builder

Defining the secret

Running the standalone deploy

Architecture principles

Service orientation (SOA/microservices)

Performance

Scalability/Resiliency

Scalability principles

Vertical and horizontal scaling (up and out)

Caching

Load balancer

Throttling

Database cluster

Cloud computing/containers

Auto Scaling

A note about automation

Don't forget about telemetry

Reactive Drivers and discoverability

Mid-Tier load balancer, timeouts, Back pressure, and caching

Scaling up microservices with an Akka cluster

Scaling up the infrastructure with Docker and AWS cloud

Summary

Building Applications with Scala

Table of Contents Building Applications with Scala Credits About the Author Acknowledgments About the Reviewer www.PacktPub.com Why subscribe? Preface What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support Downloading the example code Downloading the color images of this book Errata Piracy Questions 1. Introduction to FP, Reactive, and Scala Functional programming Principles of functional programming Immutability Disciplined state Pure functions and no side effects First-class functions and higher-order functions Type systems Referential transparency Installing Java 8 and Scala 2.11 Read Eval Print and Loop - REPL Scala Hello World using the REPL Scala REPL Hello World program Scala object-oriented HelloWorld program Scala HelloWorld App in the Scala REPL Java HelloWorld application Scala language - the basics Scala variables - var and val Scala REPL var usage Scala val usage at the Scala REPL Creating immutable variables Scala variable type in the Scala REPL

Scala variables with explicit typing at the Scala REPL Scala conditional and loops statements If statements in Scala REPL If statements in return statements in Scala REPL Basic for loop in Scala REPL For with List in Scala REPL For with if statements for filtering - Scala REPL Java code for filtering even numbers For comprehensions For comprehension in Scala REPL Java code for performing filtering with collections Scala collections Creating, removing, and getting an item from a mutable list in Scala REPL Scala tuples Scala immutable Map in Scala REPL Scala mutable Maps at Scala REPL Monads Scala Map function in Scala REPL Option Monad in Scala A list of all methods using the Scala REPL Scala class, traits, and OO programming A simple Scala class in Scala REPL Scala plain old Java object in Scala REPL Person class in Java Traits and inheritance Scala inheritance code in Scala REPL Scala traits sample code in Scala REPL Scala traits using variable mixing technique at Scala REPL Scala type alias sample in Scala REPL Case classes Pattern Matcher Scala case classes feature in Scala REPL Simple Pattern Matcher in Scala Advanced pattern matcher in Scala REPL Advanced complex pattern matcher in Scala REPL Partial functions Simple Partial function in Scala REPL Scala PartialFunction without OO using case statements in Scala REPL PartialFunction composition in Scala REPL Package objects package.scala MainApp.scala Functions Partial application

Partial function in Scala REPL Curried functions Curried functions - Scala REPL Curried transformation in Scala REPL Operator overloading Scala operator overloading in Scala REPL Implicits Futures Scala Implicits in SCALA REPL Implicit Parameter at Scala REPL Simple Future code in Scala REPL A complete Future sample at Scala REPL Reactive Programing and RxScala Simple Observables Scala with RxScala Simple Observables Scala with RxScala - Execution in the console Complex Scala with RxScala Observables Summary 2. Creating Your App Architecture and Bootstrapping with SBT Introducing SBT Installing SBT on Ubuntu Linux Getting started with SBT Adding dependencies Generating Eclipse project files from SBT Application distribution Hello world SBT / Scala App Bootstrapping our Play framework app with Activator Activator shell Activator - compiling, testing, and running Summary 3. Developing the UI with Play Framework Getting started Creating our models Creating routes Creating our controllers Working with services Configuring the Guice module Working with views(UI) Summary 4. Developing Reactive Backing Services Getting started with reactive programming IPriceService - Scala trait PriceService - RxScala PriceService implementation Guice Injection - Module.scala NGServiceEndpoint

Play framework and high CPU usage RndDoubleGeneratorController IRndService.scala - Scala trait RndService.scala - RndService implementation Module.scala - Guice Injections main.scala.html product_details.scala.html Summary 5. Testing Your Application Unit testing principles Making code testable Isolation and self-contained tests Effective naming Levels of testing Summary 6. Persistence with Slick Introducing the Slick framework MySQL setup Configuring Slick in our Play framework app Configure the database connection FPM Mapping ProductDao ReviewDAO Testing with Junit Behavior-Driven Development - BDD MyFirstPlaySpec.scala - First BDD with ScalaTest and the Play framework Testing with Play framework support ProductService.scala - FIX the code issue ImageServiceTestSpec.scala - ImageService Test ReviewServiceTestSpec.scala - ReviewService test Testing routes Controller testing RoutesTestingSpec.scala - Play framework route testing RndDoubleGeneratorControllerTestSpec.scala - RndDoubleGeneratorController tests IntegrationSpec.scala ProductControllerTestSpec.scala product_index.scala.html ImageControllerTestSpec.scala image_index.scala.html ReviewControllerTestSpec.scala review_index.scala.html ApplicationSpec.scala NGServiceImplTestSpec.scala NGServiceEndpointControllerTest.scala

ImageDao Slick evolutions Refactoring services Refactoring controllers Configuring DAO packages in Guice Refactoring tests Generic mocks Service tests Controller tests Running the application Summary 7. Creating Reports Introducing JasperReports JasperReports workflow Jasper sessions Installing Jaspersoft Studio 6 Configuring MySQL Data Adapter in Jaspersoft Studio Creating a product report Creating a review report Creating an image report Integrating JasperReports with Play framework build.sbt Generic report builder Adding the report to the product controller Adding the report to the review controller Adding the report to the image controller Routes - adding new report routes New centralized reports UI Adding the report button for each view Summary 8. Developing a Chat with Akka Adding the new UI introduction to Akka Introduction to the Actor model What is an Actor? Message exchange and mailboxes Coding actors with Akka Actor routing Persistence Creating our chat application The chat protocol The chat controller Implementing the chat controller Configuring the routes Working on the UI

Adding Akka tests Scala test for Akka Actor Chat room Actor test Chat Bot Admin Actor test Summary 9. Design Your REST API Introduction to REST REST API design HTTP verbs design Uniform API Response with HTTP status codes REST API patterns API versioning Some anti-patterns to be avoided Creating our API with REST and JSON RestApiContoller REST API Front Controller implementation JSON mapping Configuring new routes Testing the API using the browser Creating a Scala client Configuring plugins.sbt Configuring build.sbt Scala client code Creating our REST client proxies Creating ScalaTest tests for the proxies Adding back pressure The leaky bucket algorithm Scala leaky bucket implementation Testing back pressure Adding Swagger support Swagger UI Build and install Swagger Standalone Summary 10. Scaling up Standalone deploy Reports folder Changing report builder Defining the secret Running the standalone deploy Architecture principles Service orientation (SOA/microservices) Performance Scalability/Resiliency

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