Transcript REpresentational State Transfer (REST) Web Service

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An End-to-End Overview of a
RESTful Web Service
Behzad Samin
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Agenda
 Overview
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jQuery, Jersey, JDO (Behzad)
Google App Engine (David and Cory)
 Demo
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(45 minutes)
(45 minutes)
Showing a sample application (Behzad).
Highlighting some of the Google App Engine
features to make development and support easier
(David and Cory).
 Q&A
(30 minutes)
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Objectives
This is a presentation to explore a RESTful web
service end to end leveraging the following
technologies:
 jQuery (internationalization, list grid, context menu )
 Jersey
 JDO
 Google App Engine (cloud to virtualize application
server & data store)
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jQuery a JavaScript Library
Simplifies HTML document traversing, event handling,
animating, and Ajax
interactions for rapid web development.
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Cross-browser
CSS Compliant
Lightweight Footprint
And more…
To explore the features check out:
http://visualjquery.com/
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internationalization
jQuery.i18n.properties is a lightweight jQuery plugin for
providing internationalization to javascript from ‘.properties’
files, just like in Java Resource Bundles.
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Include plugin in your main page.
Load resource bundles based on browser or user
choice.
Get values per keys e.g. $.i18n.prop(’title')
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list grid
dataTable is a plug-in for the jQuery Javascript library. It
is a flexible tool which will add advanced interaction
controls to any HTML table.
 Include plugin in your main page.
 Create an html table.
 Initialize the dataTable for the table.
 Enable and disable features per your
requirements.
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context menu
contextMenu is a lightweight jQuery plugin that lets you
selectively override the browser's right-click menu with
a custom one of your own.
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Include plugin in your main page.
Create an html list
Initialize the contextMenu for the list.
Bind a function for each contextMenu item select event.
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REST vs. SOAP
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Simple Object Access Protocol (SOAP) Web Service
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REpresentational State Transfer (REST) Web Service
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Building RESTful Web Services in
Jersey
Jersey is an open source, JAX-RS (JSR 311) Reference
Implementation for building RESTful Web services.
Jersey is more than a Reference Implementation because it
provides an API so that developers may extend Jersey to
suit their needs.
Getting Started:
http://jersey.java.net/nonav/documentation/latest/index.html
 A Good Example
http://www.vogella.de/articles/REST/article.html#rest
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Java Data Objects (JDO)
To handle Data Access and Persistence, you can use
JDO, a standardised persistence API.
With JDO you can develop plain old java objects
(POJOs) and persist them as they are transparently.
 This requires very little work from the developer. It
allows persistence to any type of datastore in principle,
being designed with flexibility and datastore agnosticity
in mind.
 A good example of Defining Data Classes with JDO
http://code.google.com/appengine/docs/java/datastore/jdo
/dataclasses.html
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Demo: Suggestion Entry System
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Google App Engine
Run your web apps on Google's infrastructure:
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Easy to build
Easy to maintain
Easy to scale
Focus on your app, leave the rest to Google
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Zero to sixty: App Engine enables your application to scale automatically
without worrying about managing machines.
You're in control: The simple, web-based dashboard makes it easy to
manage your application without having to babysit it.
Google offers a Eclipse plugin that provides both Google App Engine
and GWT development capabilities. Install the plugins from
http://dl.google.com/eclipse/plugin/3.7 via the Eclipse update
manager.
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Run Applications Locally
The Eclipse Plugin allows to run applications for the
Google App Engine
locally in an environment which simulates the
environment on the App Engine.
You also have a local admin console
(http://localhost:8888/_ah/admin/ ) which
allows you to see:
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your local datastore
the task queue,
inbound email and XMPP traffic.
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Run Applications in Google Cloud
To create an application on the Google App Engine, create an
application on
the Google App Engine website (https://appengine.google.com/ ).
Afterwards you can locally create an web application and upload
this
application to the created application on the Google App Engine.
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To create an application on the App Engine press the button
"Create an application" and select an application name. You have to
choose one which is still available.