Developing Java Web Applications using Google

Apps Engine

Introduced in April 2009, Google Apps Engine for Java has come a long way, and seems ready for primetime.

Google Apps Engine is a Platform as a Service cloud platform. Anyone can create and launch a GAE application at no charge, though resource utilization fees kick in when a site near the one million hits a month mark.

Vosao (www.vosao.org) is an open source content management system developed from the ground up on Google Apps Engine for Java over the last 18 months. Vosao CMS uses many familiar Java libraries, like Velocity templates, popular web libraries, like JQuery, and popular mashup partners, like Picasa and Disqus.

Platform as a Service

Cloud Computing Savings - Real or Imaginery?

Multi-Tenancy (Not!)

Pretty Much Free

Java

!= AWS

BigTable

Throttled

IDEs, Toolkits, and Frameworks

The usual mashups

http://www.thetechtrendz.com/2010/07/top-10-best-google-app-engine-apps.html

The application environment

dynamic web serving with full support for common web technologies

persistent storage with queries, sorting and transactions

automatic scaling and load balancingGoogle Account APIs

for authenticating users and sending emaila local development environment

that simulates Google App Engine on your computertask queues

for performing work outside of the scope of a web request

scheduled tasks for triggering events

The sandbox

Outgoing access via URL fetch or email servicesIncoming access via HTTP (or HTTPS)Store state via App Engine datastore, memcache.Respond to web request, queued task, scheduled task Return response data within 30 seconds

Quotas and Limits

Free 500MB of storage and 5 million page views a month. 10 applications per developer account.

Google Apps for Business

Central Development ManagementMaster account for Google Apps domain

Service Level Agreement (99.9%)Pricing: $8 per user per month (up to $1000)Expanded Enterprise Features

Hosted SQLSSL on your domain

The Java Runtime Environment

Java SE Runtime Environment (JRE) 6 platform Java Servlets JavaServer Pages (JSPs) Java Data Objects (JDO)Java Persistence API (JPA) interfacesJavaMail API Google APIs

datastorememcache URL fetch mail images Google Accounts

Development Workflow

App Engine software development kitAPIs and LibrariesSimulatorUpload tool

Google Plugin for Eclipse

create, test, and upload The Administration Console

create, configure, version, logs, browse.

Vosao CMS for GAE

Maven JUnit Velocity TemplatesJQuery / Superfish CKEditor reCaptchaDisqus Bliki Native application

Direct calls to Google Data Services API

Open source (LGPL) on code.google.com

Vosao CMS

Challenges

ThrottlingBackup Hi volume = Hi performance

Windfalls

Direct SupportMultisite Facebook

Roche and Douglas