Grails & the World of Tomorrow

Peter Ledbrook, Developer Advocatepledbrook@vmware.com / @pledbrook

© 2012 SpringOne 2GX. All rights reserved. Do not distribute without permission.

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Cloud

NoSQL

CloudCloud

HTML5.js

Social

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HTML5.js

Web sites Applications

Server-side HTMLLow interactivityNo offline

Client-side HTMLHigh interactivityOffline

Wikipedia

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HTML5.js

Web sites Applications

Server-side HTMLLow interactivityNo offline

Client-side HTMLHigh interactivityOffline

Twitter

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HTML5.js

Web sites Applications

Server-side HTMLLow interactivityNo offline

Client-side HTMLHigh interactivityOffline

GMail

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HTML5.js

Web sites Applications

Server-side HTMLLow interactivityNo offline

Client-side HTMLHigh interactivityOffline

We’re going this way!

Example:

REST + JSON

Backbone.js + Moustache

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Google I/O 2012

Android activations to date

400 million

Apple WWDC 2012

iOS devices sold to date

365 million

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Is this the end for server-side templates?

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NoSQL / Big Data

Data the way you want it!

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NoSQL / Big Data

Everyone has interesting data

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Cloud

Scaling Reduced capital costs

Easier administration

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Cloud

Ephemeral filesystems

Session management

No Multicast

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A typical Grails app

Controller View

HTTP

Service

GORM/Hibernate

Database

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What do these cars have in common?

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Same platform, different components

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Core Grails == Chassis

Plugins == Components

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How can Grails help - Rich UIs?

URL mappings for REST

JSON & XML converters

Resources (for JS & CSS)

zipping, caching, compression

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Static resource handling

App

Kickstart Bootstrap Plugin Shiro UI Plugin

Twitter Bootstrap Plugin

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Scaffolding libraries

> grails install-plugin jquery-mobile-scaffolding> grails install-mobile-templates> grails create-domain-class org.example.Todo

<edit Book.groovy>

> grails generate-all org.example.Todo> grails run-app

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How can Grails help - Social?

oauth { providers { twitter { api = TwitterApi key = 'my-key' secret = 'my-secret' successUri = '/' failureUri = '/' } }}

Simplified OAuth via OAuth plugin:

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How can Grails help - Social?

<oauth:connect provider="twitter"> Connect to Twitter</oauth:connect>

class MyService { def oauthService

def myMethod() { def twitterUsers = oauthService.getTwitterResource( twitterAccessToken, "http://api.yourprovider.com/users/list") ... }}

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How can Grails help - NoSQL?

Accessible NoSQL via GORM

Domain Model

GORM

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How can Grails help - Cloud?

Cache plugin

RedisEhcache

For HTTP sessions, Database Session plugin

Solve the caching problem with the Cache plugin

Database Session plugin

CookieMongoDB

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PaaS deployment

AppRedis Plugin Rabbitmq Plugin

> grails cf-push

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What about horizontal scalability?

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Introducing CQRS

Updates

Views

Concurrency via event bus

Store changes

Separate data stores for queries

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Event bus (Platform Core plugin)

Event Bus

Plugins ApplicationPluginsPlugins

Save entity IndexUpdate

read DBsCall REST

service

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Event bus (Events SI plugin)

Event Bus (SI)

Plugins ApplicationPluginsPlugins

Save entity IndexUpdate

read DBsCall REST

service

AMQP

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Event bus (Events Push plugin)

Event Bus (SI)

Plugins ApplicationPluginsPlugins

Event Bridge

Browser

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grailsTodos sample

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grailsTodos sample

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grailsTodos sample

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grailsTodos sample

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grailsTodos sample

http://grailstodos.cloudfoundry.com/todos/

Try it:

See the code:

http://github.com/smaldini/grailsTodos

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Enabling plugin authors

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More Platform Core

Security API

Who is the current user?

Does the user have a particular role?

Is user permitted to do something?

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More Platform Core

Navigation API

Menu

Application Plugin

Action

Action

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More Platform Core

Config API

Declare config options

Automatic namespacing

Default values & automatic merging

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More Platform Core

Convention API

static searchable = { ... } @Taggable

Convention overrides!

e.g.

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Platform UI

Themes

+

UI tags

e.g. App Info plugin + Bootstrap Kickstart

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Project archetypes?

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SQL database

CRUD

jQuery

Multi page

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SQL for write

REST endpoints

AngularJS

Redis for read

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Events

Web Sockets (with emulation)

Spring Integration

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Summary

• The way applications are architected will change– Websites will still be built (GSP not gone yet)– Not everyone will need the same architecture– Project archetypes and scaffolding!

• No single framework has everything you need• Pick and choose the appropriate components for your

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More info

• w: http://grails.org/• f: http://grails.org/Mailing+Lists

• e: pledbrook@vmware.com• t: pledbrook• b: http://blog.springsource.com/author/peter-ledbrook/

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Q & A

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