Related Content High Performance Web Sites Google Maps, Yahoo! 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.
Amazon.com, Inc. is an American multinational electronic commerce company with headquarters in Seattle, Washington , United States. It is the world's largest online retailer . [ 7 ] Amazon.com started as an online bookstore , but soon diversified, selling DVDs , CDs , MP3 downloads, software , video games , electronics , apparel, furniture, food, toys, and jewelry. The company also produces consumer electronics —notably the Amazon Kindle e-book reader and the Kindle Fire tablet computer —and is a major provider of cloud computing services. Jeff Bezos incorporated the company (as Cadabra) in July 1994, and the site went online as Amazon.com in 1995. [ 8 ] The company was renamed after the Amazon River , one of the largest rivers in the world, [ 8 ] which in turn was named after the Amazons , the legendary nation of female warriors in Greek mythology .
This is a cross-post from my personal blog . Few weeks ago I asked a question on quora about log aggregation . I was surprised to find that no opensource solution came close to what I wanted, but I got a lot of suggessions to try out splunk. So I did. What I wanted was an aggregation tool which collects, displays and alerts based on events logged by the various webservers across the network which could be in different datacenters.
SOAP , originally defined as Simple Object Access Protocol , is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks . It relies on Extensible Markup Language (XML) for its message format, and usually relies on other Application Layer protocols, most notably Hypertext Transfer Protocol (HTTP) or Simple Mail Transfer Protocol (SMTP), for message negotiation and transmission. [ edit ] Characteristics SOAP can form the foundation layer of a web services protocol stack , providing a basic messaging framework upon which web services can be built.
Model of the Systems Development Life Cycle The systems development life cycle (SDLC) , or software development process in systems engineering , information systems and software engineering , is a process of creating or altering information systems, and the models and methodologies that people use to develop these systems. In software engineering, the SDLC concept underpins many kinds of software development methodologies . These methodologies form the framework for planning and controlling the creation of an information system: [ 1 ] the software development process . [ edit ] Overview The Systems development life cycle (SDLC) is a process used by a systems analyst to develop an information system , training, and user (stakeholder) ownership.
Author : Exforsys Inc. Published on: 26th Nov 2005 | Last Updated on: 28th Nov 2010 Software Architecture & Design Patterns This article reviews some of the architecture Design patterns for Enterprise Applications built using the .NET Platform. Application Architecture:
This tutorial outlines the first fundamental principle of object oriented programming which is the encapsulation of information and functionality within a class. Inheritance and polymorphism will be examined in the next tutorial . Encapsulation Encapsulation is the ability of an object to be a container (or capsule) for related properties (ie. data variables) and methods (ie. functions). Older languages did not enforce any property/method relationships.
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.
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).