Martinelli-Waddel-5-07.pdf (application/pdf Object) A Conversation with Werner Vogels. 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. The magnitude is awe-inspiring.
Users view these large-scale Web sites from a narrower perspective. Improving Performance on the Internet When it comes to achieving performance, reliability, and scalability for commercial-grade Web applications, where is the biggest bottleneck? Browse this Topic: Favorite Tweets by @ACMQueue Queue on Reddit A Conversation with Werner Vogels Learning from the Amazon technology platform Many think of Amazon as “that hugely successful online bookstore.” Vogels came to Amazon from Cornell University, where he was working on high-availability systems and the management of scalable enterprise systems. Interviewing Vogels is ACM Turing Award winner and Microsoft Technical Fellow Jim Gray. WV Possibly. JG What about tools? Amazon.com. Amazon has separate retail websites for the United States, the United Kingdom and Ireland, France, Canada, Germany, Italy, Spain, Netherlands, Australia, Brazil, Japan, China, India and Mexico.
Amazon also offers international shipping to certain other countries for some of its products.[16] In 2016, Dutch and Polish language versions of the German Amazon website were launched.[17][18] In 2015, Amazon surpassed Walmart as the most valuable retailer in the United States by market capitalization,[19] and is, as of 2016 Q3, the fourth most valuable public company.[20] History[edit] The company was founded in 1994, spurred by what Amazon founder Jeff Bezos called his "regret minimization framework," which described his efforts to fend off any regrets for not participating sooner in the Internet business boom during that time.[21] In 1994, Bezos left his employment as vice-president of D.
Mergers and acquisitions[edit] Investment[edit] Subsidiaries[edit] Board of directors[edit] Subsidiaries[edit] SOAP. Characteristics[edit] SOAP can form the foundation layer of a web services protocol stack, providing a basic messaging framework upon which web services can be built. This XML-based protocol consists of three parts: an envelope, which defines what is in the message and how to process it, a set of encoding rules for expressing instances of application-defined datatypes, and a convention for representing procedure calls and responses. SOAP has three major characteristics: extensibility (security and WS-routing are among the extensions under development), neutrality (SOAP can be used over any transport protocol such as HTTP, SMTP, TCP, UDP, or JMS), and independence (SOAP allows for any programming model).
As an example of how SOAP procedures can be used, a SOAP message could be sent to a web site that has web services enabled, such as a real-estate price database, with the parameters needed for a search. History[edit] Specification[edit] SOAP structure Processing model[edit] SOAP sender. Systems Development Life Cycle - Wikipedia, the free encyclopedi. Model of the systems development life cycle, highlighting the maintenance phase. 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] Describe the costs and benefits. 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. 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: - Set of significant decisions about how a software system is organized - Selection of the elements that the system comprises of - Interfaces of the elements - Behavior of these elements - Interaction of these elements within the system and with other systems What are Design Patterns?
A Software design pattern provides us a general solution to a common problem in software design. It is a description or template for how to solve a problem. There are various types of Software Design Patterns: A) Creational patterns: Java Tutorial 4 - Encapsulation and Classes. This tutorial discusses the second and third fundamental object oriented programming principles of inheritance and polymorphism. 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. Then more specific classes could be defined for salaried, commissioned and hourly 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. Interfaces. 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. If the sex is Male (M), it displays welcome message saying Hello Mr. <Name> and if the sex is Female (F), it displays message saying Hello Ms <Name>. 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. This class accepts two arguments from the system at runtime and prints the names.
Running the program: After compiling and running the code on my computer with the arguments Prashant and M: java Prashant M. 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). The standard defines a schema for capturing the result of a digital signature operation applied to arbitrary data and its processing. XML signatures add authentication, data integrity, and support for non-repudiation to the signed data.
XML Signature has the ability to sign only specific portions of the XML tree rather than the complete document. B.2 Web Services Security.