background preloader


Facebook Twitter

Martinelli-Waddel-5-07.pdf (application/pdf Object) A Conversation with Werner Vogels. Related Content High Performance Web Sites Google Maps, Yahoo!

A Conversation with Werner Vogels

Mail, Facebook, MySpace, YouTube, and Amazon are examples of Web sites built to scale. They access petabytes of data sending terabits per second to millions of users worldwide. The magnitude is awe-inspiring. Improving Performance on the Internet. Jeff Bezos incorporated the company (as Cadabra) in July 1994 and the site went online as in 1995.[12] The company was renamed after the Amazon River, one of the largest rivers in the world,[12] which in turn was named after the Amazons, the legendary nation of female warriors in Greek mythology.

Amazon has separate retail websites for United States, United Kingdom, France, Canada, Germany, Italy, Spain, Australia, Brazil, Japan, China, India and Mexico, with international shipping to certain other countries for some of its products.[13] In 2011, it had professed an intention to launch its websites in Poland,[14] Netherlands, and Sweden, as well.[15] An Austrian website operates as part of the German website. History[edit] After reading a report about the future of the Internet which projected annual Web commerce growth at 2,300%, Bezos created a list of 20 products which could be marketed online.

Acquisitions and investments[edit] Source:[28] Investment[edit] Subsidiaries[edit] SOAP. Characteristics[edit]


Systems Development Life Cycle - Wikipedia, the free encyclopedi. Model of the systems development life cycle, highlighting the maintenance phase.

Systems Development Life Cycle - Wikipedia, the free encyclopedi

The systems development life cycle (SDLC), also referred to as the application development life-cycle, is a term used in systems engineering, information systems and software engineering to describe a process for planning, creating, testing, and deploying an information system.[1] The systems development life-cycle concept applies to a range of hardware and software configurations, as a system can be composed of hardware only, software only, or a combination of both.[2] Overview[edit] A systems development life cycle is composed of a number of clearly defined and distinct work phases which are used by systems engineers and systems developers to plan for, design, build, test, and deliver information systems.

In project management a project can be defined both with a project life cycle (PLC) and an SDLC, during which slightly different activities occur. History[edit] Phases[edit] Scalable Internet Architectures Presentation 2.pdf (application/ Software Architecture & Design Patterns. Software Architecture & Design Patterns This article reviews some of the architecture Design patterns for Enterprise Applications built using the .NET Platform.

Software Architecture & Design Patterns

Application Architecture: Software Applications come in all shapes and sizes. Based on their design and architecture enterprise applications can be classified into various categories such as: * Distributed Applications * Web Applications * Web Services * Smart Client Applications Simply put Application architecture is: Java Tutorial 4 - Encapsulation and Classes. This tutorial discusses the second and third fundamental object oriented programming principles of inheritance and polymorphism.

Java Tutorial 4 - Encapsulation and Classes

The first fundamental principle, encapsulation, was discussed in the previous tutorial. Inheritance Inheritance is the capability of a class to use the properties and methods of another class while adding its own functionality. An example of where this could be useful is with an employee records system. You could create a generic employee class with states and actions that are common to all employees. The Object class is the highest superclass (ie. root class) of Java. Java uses the extends keyword to set the relationship between a parent class and a child class. Public class GraphicsBox extends Box The GraphicsBox class assumes or inherits all the properties of the Box class and can now add its own properties and methods as well as override existing methods.

Abstract Classes Abstract methods are methods with no body specification. Interfaces Polymorphism. JAVA DESIGN PATTERNS, Creational Patterns - Factory Pattern. Creational Patterns - Factory Pattern Factory of what? Of classes. In simple words, if we have a super class and n sub-classes, and based on data provided, we have to return the object of one of the sub-classes, we use a factory pattern. Let’s take an example to understand this pattern. Example: Let’s suppose an application asks for entering the name and sex of a person. The skeleton of the code can be given here. This is a simple class Person having methods for name and gender.

Also, the class Female Now, we have to create a client, or a SalutationFactory which will return the welcome message depending on the data provided. Web Services Architecture. B An Overview of Web Services Security Technologies (Non-Normative) This section attempts to provide a non-exhaustive description of current available work around Web services security relevant to the requirements and solutions presented in 3.6 Web Services Security.

Note that although these technologies build on existing security technologies, they are relatively new and need to be fully tested in actual deployment scenarios. B.1 XML-Signature and XML-Encryption XML signatures are designed for use in XML transactions. It is a standard that was jointly developed by W3C and the IETF (RFC 2807, RFC 3275). XML Signature has the ability to sign only specific portions of the XML tree rather than the complete document. XML Encryption specifies a process for encrypting data and representing the result in XML. B.2 Web Services Security The work provides a general mechanism for associating security tokens with messages. B.3 XML Key Management Specification (XKMS) 2.0 B.6 Identity Federation.