what's new in grails 3

Unless otherwise indicated, these sl ides are © 2013-2015 Pivotal Software, Inc. and l icensed under a Creat ive Commons Attr ibut ion-NonCommercial l icense: ht tp: / /creat ivecommons.org/ l icenses/by-nc/3.0/

SPRINGONE2GXWASHINGTON, DC

What’s new in Grails 3?By Graeme Rocher

@graemerocher


Who we are?

Jeff Scott Brown Object Computing Inc. @jeffscottbrown [email protected]

2

Graeme Rocher Object Computing Inc. @graemerocher [email protected]

mailto:[email protected]

mailto:[email protected]


Grails + OCI• OCI focused on Grails• Full service support

– Consulting– Training– Support

• Commitment to engineering • Grails team at OCI growing

– Come speak to us!

3

Unless otherwise indicated, these sl ides are © 2013-2015 Pivotal Software, Inc. and l icensed under a Creat ive Commons Attr ibut ion-NonCommercial l icense: ht tp: / /creat ivecommons.org/ l icenses/by-nc/3.0/ 4

More at ociweb.com/grails

Visit the OCI’s Table #2 to meet our Grails Team!

Graeme Rocher Jeff Brown

Dave Klein Colin Harrington



The OCI Grails Team is growing — will You join us?


State of Nation• Grails 3.0.7 the latest version• Grails 3.1 Milestone 1 available• Grails 2.x maintenance mode• Grails 2.x plugins being migrated

• The ones worth migrating

6


Join the Slack Community!

7

http://slack-signup.grails.org



What’s new in Grails 3?• Gradle Build System• Built on Spring Boot• Application Profiles• Plugins via Traits• New Code Generation API• Application Event Model• More - Interceptors, Application class, Geb tests etc.

8

3.03


Gradle• Grails 2.x build system removed• Replaced with Gradle build• Complete access to Gradle plugin

ecosystem• Powerful and flexible builds• Build related plugins replaced

by Gradle equivalents • (code coverage, findbugs etc.)

9


Plugin Delineation

10

Grails.sh

Static void m

ain

Gradle B

uild

Forked Grails Runtime

test-app

shellrun-app

console

Codegen Plugins

Build Time Plugins

Runtime Plugins


Gradle• Allow Micro or Monolith Applications• Multi-Project Plugin Architectures• Run individual sub projects • Or run as a whole

11


Demo

12

Gradle


Spring Boot• Grails 3 built on Spring Boot• Boot handles

• Embedded servers• Runnable JARs• WAR packaging• Configuration• Spring Cloud

13


Why Spring Boot?• Handles Fat JAR and embedding• Already supports different runtimes• Includes monitoring and health

checks• Grails 3 apps can take advantage of

Boot auto configuration• Spring Cloud

14


Demo

15

Spring Boot


The Application Class• Found in grails-app/init • Has a static void main, so can be run / debugged from the IDE• Implements grails.core.GrailsApplicationLifeCycle

• Same hooks available to plugins• Can define beans with doWithSpring or @Bean • Can define packaging scanning with packageNames()

16


The Application Class

17

import grails.boot.GrailsApp import grails.boot.config.*

class Application extends GrailsAutoConfiguration { static void main(String[] args) { GrailsApp.run(Application) } }


New Configuration API• The grailsApplication.config object now implements grails.config.Config

• Configuration read from Spring PropertySources:• System properties, environment, application.yml etc.

• Built on type conversion and default values• Integration with @Value configuration injection

18


Configuration API

19

boolean isFooEnabled = config .getProperty('foo.bar', Boolean, true)

// or

@Value('foo.bar') boolean isFooEnabled


Application Profiles• Extensible project profiles with an API exposing structure• Profile specific commands (run, package, test)• Profile specific plugins• Profile specific project templates and file templates (code generators) backed by

Git• Community maintained profiles and core profiles

20


Application Profiles• Each profile can have distinct plugins, runtimes and packaging (JAR, WAR etc.)

21

$ grails create-‐app myapp —profile=web-‐api $ cd myapp $ grails war $ java -‐jar target/myapp.war


Profile Repository• https://github.com/grails-profiles/grails-profile-repository • Profiles checked out locally and periodically updated• Profiles wrap code generation infrastructure

22

$ grails create-‐controller foo

Profile .getCurrentProfile() .getCommand('create-‐controller') .execute( 'foo' )

https://github.com/grails-profiles/grails-profile-repository


Application Profiles• Find out the available profiles with grails list-profiles:

23


Grails 3 - The REST profile• Introduced in Grails 3.0.5• Refined in Grails 3.1 M1• Targeted at building REST applications• REST Specific plugins and commands• No GSP, asset pipeline, UI plugins

24

3.03


Demo

25

REST Profile


Grails 3 - REST profile• Profile specific commands:

• create-domain-resource - creates an @Resource domain

• create-restful-controller - Creates a RestfulController

• Default commands provided focused templates

26


Grails 3 - JSON and Markup Views• Statically compiled, extensible JSON views:

27

json.person { name "bob" }

{"person":{"name":"bob"}}


Demo

28

JSON Views


Grails 3 - Interceptors• Replace previous Filters mechanism• Compatible with static compilation (@CompileStatic)• Implements the Interceptor trait• Match by convention

• BookInterceptor matches all actions of BookController• Configurable matching with match / matchAll methods

29


Grails 3 - Interceptors

30

class MyInterceptor { MyInterceptor() { matchAll() .except(controller: "user") } boolean before() { true } boolean after() { true } void afterView() {} }


Demo

31

Interceptors


Evolution of Metaprogramming

32

Runtime Metaprogramming

(ExpandoMetaClass)

Compile time Metaprogramming(AST Transforms)

Traits & Transforms

Grails 1.x Grails 2.x Grails 3.x


Core Grails Traits• Controller - implemented by all controllers• DomainClass - implemented by all domain classes

• GormEntity - implemented by all GORM entities• Service - implemented by all services• TagLibrary - implemented by all tag libraries• Interceptor - all Grails interceptors

33


Adding Behaviour with Traits• Use Enhances to add behaviour

34

import grails.artefact.*

@Enhances('Controller') trait MyTrait { void myNewMethod() { … } }


More on Plugins & Traits

• Session Plug: • “Grails 3.x Inside and Out”

• 12:45 PM• Wednesday (Tomorrow)• See you there!

35

3.03


Deprecations / Removals• Servlet 2.5 support (no web.xml)• Gant & Current Build System• Integration Tests - Now Geb tests• Metaprogramming - Replaced by Traits & Groovy

extensions• Filters - Replaced by Interceptors

36


Servlet 3.0 only and no web.xml• Adding new servlets and filters can be done via Spring beans (Ordering with

@Ordered)

37

Closure doWithSpring() {{-‐> characterEncodingFilter( CharacterEncodingFilter) { encoding ='utf-‐8' } }}


What’s coming in Grails 3.1?• Lots to look forward to:

• Refined REST profile• MongoDB 3.0 (Codecs)• Hibernate 5• AngularJS / SPA support• More flexible profile support

o repositories, local profiles etc.

38



Grails keeps getting better!

Grails 3.1 is scheduled to ship in Q4, 2015. With this new release, you can expect to see even greater

efficiency with Single Page Applications (SPA), REST profiles and more!


And next year in Grails 3.x?• Netty profile

• Low memory footprint• Asynchronous• REST• Cloud native

• GORM Async• MongoDB 3.0 async driver support• Lightweight SQL implementation using non-blocking Postgres /

MySQL

40


Q & A

41



Don’t forget to stop by OCI’s Table #2 for several chances to win a Grails t-shirt and an

Apple Watch Sport!


Stay Connected.

Web: grails.orgStackOverflow: http://stackoverflow.com/tags/grails Slack: http://slack-signup.grails.org Twitter: twitter.com/grailsframeworkLinkedIn: http://linkedin.com/groups/Grails-User-Group-39757

43


http://grails.org

http://stackoverflow.com/tags/grails


http://inkedin.com/groups/Grails-User-Group-39757

what's new in grails 3

Technology