Gradlebuild automation tool

BJUG #27, november 2014Ioan Eugen Stan

About me

● independent IT Consultant (Java, Architecture)● Open Source Hacker● Web: http://ieugen.ro/● http://github.com/ieugen● @ieugen222Code: https://github.com/ieugen/bjug27-gradle-intro

Software development = creativity + lots of

repetive tasks

We hate repetitive tasks !!

We invented build tools ;)

A bit of build tool history

● shell scripts● simple tools: make, ant, etc ● tools with lifecycle: maven, gradle, etc.

Apache Ant

● like make, java oriented, multi-platform● has limited assumptions of build

environment● very flexible● imperative (no conventions)● lots of repetition● complex builds are hard to maintain● xml based configuration file

Apache Maven

● opinionated about the build lifecycle● introduced Convention over Configuration● strict lifecycle● java centric● limited flexibility in configuration● xml based configuration

Gradle● gradle uses build scripts: build.gradle● every build is a Groovy script● embraces Convention over Configuration and Don’t

Repeat Yourself● (almost) everything is convention and can be changed● creates a dynamic model of the workflow as a Directed

Acyclic Graph ~ DAG

Gradle features● declarative builds and build-by-convention● DSL for dependency based programming● structures your build● multi-project builds● gradle wrapper● build daemon - speeds build● many ways to manage dependencies● free and open-source

Maven build lifecycle - very strict

http://opensourceforgeeks.blogspot.ro/2014/01/building-java-projects-with-maven.html

Gradle build lifecycle

● Initialization○ identifies project to build○ creates Project instance

● Configuration○ executes buildscript{} for all its scope○ configures the project objects

● Execution○ creates the Task DAG○ runs the build

Task graphs (DAGs) java-plugin

Gradle Task

● single atomic piece of work for a build● belongs to a project● has properties● has a list of Actions

Invocation: gradle taskName

Dependencies code + demo

Build Daemoncode + demo

Usefull gradle pluginsCheck http://plugins.gradle.org/

and http://www.gradle.org/docs/current/userguide/standard_plugins

.html

References● Code: https://github.com/ieugen/bjug27-gradle-intro● UserGuide http://www.gradle.org/docs/current/userguide/userguide.html● DSL Reference http://www.gradle.org/docs/current/dsl/● Rocking the Gradle https://www.youtube.com/watch?v=5a91dBLX8Qc● Gradle intro https://www.youtube.com/watch?v=hvMKpQqo2ts