Amplify iResult (97 -2003 Format)

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Name :Dhirendrasinh B. Rathod

Class :MSc(IT) Sem-3

Exam No:90490004

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What is Cloud Computing?

About Google Cloud

DataNucleus Access Platform &JDO & JPA

PersistenceManagerFactory JDOQL

How to use Appengine

Amplify iResult

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More than just Software-as-a-Service, CloudComputing allows you to truly leverage open source,open systems and open standards, as well as theInternet to access massively scalable technologyenabled services, without the escalating costs andtraditional IT infrastructure management headachesthat can slow you down and interfere with yourorganizations overall progress.

The Fifth Generation of Computing (after Mainframe,Personal Computer, Client-Server Computing, and theweb)

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Tap into supercomputing power from large groups ofnetworked servers via the Web.

Pay for space and storage on an as-needed basis.

Build and host applications in a secure environment. Stop relying on desktop PCs for networking and

complex data processing and analysis.

Increase network availability and security while

reducing total cost of ownership.

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Agilityimproves with users able to rapidly and inexpensively re-provision technological infrastructure resources.

Cost is claimed to be greatly reduced and capital expenditure isconverted to operational expenditure. This ostensibly lowersbarriers to entry, as infrastructure is typically provided by a

third-party and does not need to be purchased for one-time orinfrequent intensive computing tasks. Pricing on a utilitycomputing basis is fine-grained with usage-based options andfewer IT skills are required for implementation (in-house).

Device and location independence enable users to accesssystems using a web browser regardless of their location or what

device they are using (e.g., PC, mobile). As infrastructure is off-site (typically provided by a third-party) and accessed via theInternet, users can connect from anywhere.

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Multi-tenancy enables sharing of resources and costs across a largepool of users thus allowing for: Centralization of infrastructure in locations with lower costs (such as real

estate, electricity, etc.) Peak-load capacity increases (users need not engineer for highest possible

load-levels) Utilization and efficiency improvements for systems that are often only 10

20% utilized.

Reliability improves through the use of multiple redundant sites,which makes cloud computing suitable for business continuity anddisaster recovery. Nonetheless, many major cloud computing serviceshave suffered outages, and IT and business managers can at times dolittle when they are affected.

Scalabilityvia dynamic ("on-demand") provisioning of resources on afine-grained, self-service basis near real-time, without users having toengineer for peak loads. Performance is monitored, and consistent andloosely-coupled architectures are constructed usingweb services as thesystem interface.

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Any Browser

Google Apps-Web GUI

App Engine-Java/Python

Google Server

GoogleInfrastructure

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Free Service Limit - 500MB Storage, 5 Million Page Views

Supports Java & Python

Java Tool-Eclipse(Pre Configured extra Plug-ins)

Data store JDO

JSP, Servlet

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DataNucleus Access Platform It is an open source implementation of several Java

persistence standards, with an adapter for the AppEngine datastore.

For java App Engine includes support for two differentAPI for the datastore

JDO(Java Data Objects) JPA(Java Persistence API)

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JDO Also called POJO(Plain Old Java Object)

File needed jdo2-api-2.3-eb.jar

It Covers Method to use JDO

Some covered annotation are : -

annotations.IdGeneratorStrategyjdo.annotations.IdentityTypejdo.annotations.PersistenceCapable

jdo.annotations.Persistentjdo.annotations.PrimaryKey

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Each request that uses the datastore creates a newinstance of the PersistenceManager class. It does sousing an instance of the PersistenceManagerFactoryclass.

To use PersistenceManagerFactory we can importPMF.java file from SDK demos to our project.

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The JDO standard defines a mechanism for queryingpersistent objects called JDOQL.

You can use JDOQL to perform queries of entities inthe App Engine datastore, and retrieve results as JDO-enhanced objects.

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Documents

Amplify iResult (97 -2003 Format)