google web app v1.1

8/2/2019 Google Web App v1.1

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- Dhara Thakker


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Introduction App Engine Parts

Runtime Environment

Java Environment

DataStore Services

Uploading to App server

Usage Quotas

Restrictions Competitors

Benefits

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Google Web App is a cloud computing platform for

developing & web application hosting service. Google App Engine is Platform as a Service (PaaS)

technology.

Google App Engine lets you run your web applicationson Google's infrastructure.

App Engine applications are easy to build, easy tomaintain, and easy to scale as your traffic and datastorage needs grow.

With App Engine, there are no servers to maintain: You

just upload your application, and it's ready to serve yourusers.

Google App Engine supports apps written in severalprogramming languages.

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One can build your app using standard Javatechnologies, including the JVM, Java servlets, and

Java programming languageor any otherlanguage using a JVM-based interpreter orcompiler, such as JavaScript or Ruby. App Enginealso features a dedicated Python runtimeenvironment.

It is used to host Web Applications or TraditionalWeb contents.

Google Web

App

Web

Applications

Traditional Web

Contents

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Shopping Carts

Social

Networking

Sites

Multi-player

Games

Survey

Applications

Project

ManagementCollaboration

Publishing

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Traditional

Website content

Documents

Images

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It is designed to host applications with manysimultaneous users.

WebApplication

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When no. of users increases, application cankeep on working without degrading

performance. In other words, application can scale.

As users increases, App Engine allocatesmore resources to the application.

One pays per usage of resources. Resourcesare measured in GigaBytes.

There is NO monthly fees or upfront fees ,

you only pay for what you use.

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Resources

WebApplication

Google App Engine

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Bandwidth

Storage

CPU

App specificresources

Resources

Web

Application

Google App Engine

Incoming

Outgoing

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Both incoming & outgoing bandwidth isbilled.

Free resources are enough for smallapplication with low traffic.

Free service level can accommodate 5 millionviews a month, according to Google.

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Google App Engine

Runtime

EnvironmentData Store

Scalable

Services

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dynamic web serving, with full support for commonweb technologies.

persistent storage with queries, sorting andtransactions.

automatic scaling and load balancing.

APIs for authenticating users and sending email usingGoogle Accounts.

a fully featured local development environment thatsimulates Google App Engine on your computer.

task queues for performing work outside of the scopeof a web request.

scheduled tasks for triggering events at specifiedtimes and regular intervals.

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Applications run in a secure SANDBOXenvironment that provides limited access tothe underlying operating system.

Application can run in one of three runtimeenvironments : Go Environment

Java Environment

Python Environment

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App Engine runs your Java web applicationusing a Java 6 JVM in a safe "sandboxed"environment.

App Engine invokes your app's servlet classes

to handle requests and prepare responses inthis environment.

Installation & setup in Eclipse.

http://www.youtube.com/watch?v=SyRqiA5z

H_Y&feature=related http://www.youtube.com/watch?v=wcsAP13

Q47Q&feature=related

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App Engine provides a distributed datastorage service that features a query engineand transactions.

It is not like a traditional relational database.Data objects, or entities, have a kind and aset of properties.

Datastore entities are schemaless.

It is strongly consistent and uses optimisticconcurrency control.

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URL Fetch Applications can access resources on the Internet,

such as web services or other data, using AppEngine's URL fetch service.

Memcache This service provides your application with a high

performance in-memory key-value cache that isaccessible by multiple instances of your application.It is useful for data that does not need the

persistence and transactional features of thedatastore, such as temporary data or data copiedfrom the datastore to the cache for high speedaccess.

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Mail

Applications can send email messages using AppEngine's mail service.

Image Manipulation The Image service lets your application manipulate

images. With this API, you can resize, crop, rotateand flip images in JPEG and PNG formats.

Task Queues Applications can perform work outside of a user

request, initiated by a user request. If an app needs

to execute some background work, it can use theTask Queue API to organize that work into small,discrete units, called tasks.

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http://www.youtube.com/watch?v=P3GT4-m_6RQ&feature=related

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Google App Engine requires a google account to get started,

and an account may allow the developer to register up to 10applications.

Hard Limits :

Quota LimitTime per request 30 sec, indefinite for

backends

Blobstore size (total file size per app) 2 GB

HTTP response size 32 MB

Datastore item size 1 MB

Application code size 150 MB

Memory cap 128MB, up to 1GB perinstance for backends

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Free Quotas :

Quota LimitEmails per day 2000

Bandwidth in per day 1 GB

Bandwidth out per day 1 GB

CPU time per day (to be removed) 6.5 hours per day

Instance-hours (IH) 24 hours per day*

Data stored 1 GB

URLFetch API calls per day 657,084*

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Amazon Web Services Microsoft's Azure Services Platform

Salesforce.com's Force.com Platform

Sina.com's Sina App Engine Heroku

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http://en.wikipedia.org/wiki/Amazon_Web_Serviceshttp://en.wikipedia.org/wiki/Azure_Services_Platformhttp://en.wikipedia.org/wiki/Force.comhttp://en.wikipedia.org/w/index.php?title=Sina_App_Engine&action=edit&redlink=1http://en.wikipedia.org/wiki/Herokuhttp://en.wikipedia.org/wiki/Herokuhttp://en.wikipedia.org/w/index.php?title=Sina_App_Engine&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Sina_App_Engine&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Sina_App_Engine&action=edit&redlink=1http://en.wikipedia.org/wiki/Force.comhttp://en.wikipedia.org/wiki/Azure_Services_Platformhttp://en.wikipedia.org/wiki/Amazon_Web_Services


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Easy to get Started Free and Risk-free Development

Automatic Scalability

The reliability, performance and security ofGoogle's infrastructure

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