Learning Groovy

Table of Contents

Welcome

Groovy and Other Non-Java Languages On The JVM

Installing Groovy

Running a “Hello, World” Script

Running Groovy from Java

Asserts, Imports, and Def

Integer and Floating Point Types

Operator Overloading

Strings and Groovy Strings

Multiline Strings and the “Slashy” String Syntax for Regular Expressions

A Lot of Power From Little Code

Groovy Ranges and Lists

Maps and Sets

Iterating Using Closures

Transforming Collections with the Collect Method

Demo: Accessing the Google Geocoder Web Service

Demo: Accessing the ICNDB Web Service

Safe Navigation, Spaceship Operator, and Elvis

Demo: Sorting Strings

Demo: Summing Numbers

Demo: Closures As A Filter

Demo: Processing Web Pages

Demo: Printing Padded Binary Strings

A Quick Groovy Review

Using Groovy POGOs in a Java Banking Example

Using XmlSlurper and JsonSlurper

Builders

Demo: Using Flickr’s API to Display Pictures

Demo: Open Weather

The Metaclass/Adding Properties and Methods

Categories

Demo: Enhancing Existing Java Classes

Demo: Extra Logging Levels

Introduction to AST Transforms

@Delegate

@Immutable

@Singleton

@Sortable

@Builder, @TypeChecked, @Compile AST Transformations Wrap Up

Methods on Collections

Methods on Strings and Numbers

Combinations and Permutations

File I/O

How Operators Map to Methods and Examples from the Groovy Libraries

Adding Operator Methods

Accessing Databases

CRUD Methods

Calling Stored Procedures

A Quick Groovy Review

Introduction to Spock

Blocks: expect

Blocks: when/then

Blocks: setup, cleanup, the old Method, and Exception Handling

Data-Driven Specs

Database-Driven Specs and Processed Inputs

Mocking Collaborators

POGOs as Spring Beans

Refreshable Beans

Groovy Aspects and Inline Scripted Beans

Grails and Spring

Groovy and Spring Boot

JPA and Groovy

NoSQL and Groovy

Closures, Lambdas, and Currying

Map-filter-reduce and Inject

Immutable Objects

Composition, Method References, and Memoize

Trait Basics

Multiple Traits, Traits with Properties, Conflicts, Runtime Traits, and Other Features

Demo: Creating a Range

Demo: Basic Authentication

Demo: Closure Coercion

Demo: Returning from Closures

Demo: Dates and Times

REST Principles

Groovy Clients for REST

Implementing RESTful Services Using JAX-RS

Customizing Messages with JsonBuilder and JsonSlurper

REST with Ratpack and Grails

Course Wrap Up