New Atlanta Communications, LLC

Transcript New Atlanta Communications, LLC

Introduction to Object oriented Programming for CFML Developers

Josh Adams

About Me

Phone: (678) 256-5395 Developer Evangelist for BlueDragon at New Atlanta CFML Developer Past President of the Atlanta ColdFusion User Group, Inc.

Q&A Protocol

Please ask questions!

Feel free to ask questions at any time during the presentation Time permitting, we'll do Q&A at the end of the presentation I will address as many questions as possible Due to time constraints some questions may go unanswered today If I do not answer your question today, I will get back to you with an answer if you give me contact information New Atlanta Confidential. | 2 © Copyright 1997-2007

OO Background

OO (and OOP) = Object-oriented programming Motivation (a.k.a. why it exists, why it is used): provide flexibility and maintainability to code Ease of code reuse Ease and reliability of application modification through decreased code modification and instead increased code addition Guiding principle: code modularity Great…but my code isn't OO and it's pretty flexible, maintainable, and modular… New Atlanta Confidential. | 3 © Copyright 1997-2007

Functional/Procedural Programming

Let's start with what we know… Functional/procedural programming paradigm: collection of functions/procedures We don't have procedures per se in CFML but a function that returns no result is effectively a procedure Functions can be thought of as actors; they act on variables Functions do the work of the program Let's take a look at a simple example… New Atlanta Confidential. | 4 © Copyright 1997-2007

OO Programming

An object is a thing More precisely, an object is a representation of a thing Has characteristics We call these "attributes" or "properties" Properties are just variables rebranded!

Those things which the thing has Has behaviors We call these "methods" Methods are just functions rebranded!

Objects

Functions still do the work in OO!

But now they… …just know what they need to know!

…generally contain less code!

Methods

Objects in CFML

CFC Background

CFC = ColdFusion Component A text file with the extension cfc, the contents of which are CFML surrounded by opening and closing tags The opening and closing tags are not required by CFMX but they are required by BlueDragon New Atlanta Confidential. | 9 © Copyright 1997-2007

CFCs

The "building block" of OO CFML Blueprint for objects In the same way that a blueprint for a physical object defines what the object will look like and what it can do, a CFC defines what a virtual object "looks" like and what it can do Just as one blueprint can be used to create multiple physical objects, a CFC can be used to create multiple virtual objects CFCs are essentially the CFML equivalent of the classes found in many other OO languages New Atlanta Confidential. | 10 © Copyright 1997-2007

CFC Contents

Specification of the properties of objects that are created from the CFC Think of a CFC's properties as what objects created from the CFC have Definition of the methods of objects that are created from the CFC Think of a CFC's methods as what objects created from the CFC do Let's take a look at a simple example… New Atlanta Confidential. | 11 © Copyright 1997-2007

OO Concepts (Part 1)

Abstraction Grouping together in a CFC those properties and methods that define an object Encapsulation Information hiding Putting properties and methods in a CFC and exposing only those that need to be accessible outside the CFC and otherwise hiding all implementation details For simplicity, our CFC examples use the "this" scope, making all properties accessible externally to the CFC; in practice, properties are generally in the Variables scope and getter and setter methods are used to access them New Atlanta Confidential. | 12 © Copyright 1997-2007

The Power of OO

Code flexibility, maintainability, and modularity But how is that different from functional/procedural code?

Functional/Procedural Code Maintenance

OO Code Maintenance (Part 1)

OO Code Maintenance (Part 2)

There has to be a better way!

OO Concepts (Part 2)

Inheritance Derivation of CFCs from other CFCs; the derived CFCs inherit the properties and methods of the base CFCs These can be overridden, which means that they can be redefined in the derived CFCs Aids code reuse Keyword for inheritance in CFML: "extends" A CFC can only extend one other CFC Polymorphism Different objects having the same methods (which may do different things) which can be substituted for one another New Atlanta Confidential. | 17 © Copyright 1997-2007

Abstract CFCs

Can the base CFC merely define that a derived CFC should have particular methods and leave the details of the implementation of those methods up to those derived CFCs?

Yes—use an abstract CFC!

Cannot be instantiated directly Defined using Contains one or more abstract methods Defined used Can also contain fully implemented methods New feature of BlueDragon 7.0!

Interfaces

But can I use multiple inheritance?

Yes—use an interface!

Cannot be instantiated directly Defined using Contains one or more abstract methods Defined used Contains ONLY abstract methods New feature of BlueDragon 7.0!

OO Code Maintenance (Part 3)

Let's look back at our simple OO example Let's use an abstract CFC and then see how easy it is to add another light source… Then let's use an interface… New Atlanta Confidential. | 20 © Copyright 1997-2007

Introduction to New Atlanta:

We are Web Application Server Technology Experts

BlueDragon is our 3rd generation web-scripting technology

FileMaker Web Companion (Lasso) 2.

Web Publisher for FileMaker Pro databases Built in 1995, sold to Apple in 1997 Over 10 Million licenses since initial release ServletExec - Servlet/JSP Container First servlet engine on the market for Microsoft IIS and Netscape Enterprise Server with Servlet 1.0 Specification support Charter members of Servlet and JSP Expert Groups (Sun's JCP) Ten of thousands of licenses since 1997 BlueDragon CFML Runtime with native deployment and integration on J2EE and .NET platforms

New Atlanta has over 12,000 customers in 100+ countries

New Atlanta Customers

Land's End

Over $1 billion in e-sales

MySpace.com

Over 110 million users ESRI – ArcIMS: web-based GIS ServletExec ships on ArcIMS CD

American Airlines

Worldwide reporting of safety incidents

Yahoo! Resumix

hotjobs.yahoo.com

BlueDragon Editions

Standalone (including "Free version") BlueDragon Server & Server JX Native .NET

No need to write ASP.NET.

Direct .NET platform advantages within your CFML applications BlueDragon .NET

BlueDragon Background

Oldest Java-based CFML application server 1998: created by a consultancy in Scotland 2002: purchased and productized by New Atlanta 2006: established a partnership with BEA through which BEA licenses BlueDragon from New Atlanta for sale as their own product Native .NET version: released in 2005 New Atlanta is a Microsoft Gold Certified Partner BlueDragon.NET is a Microsoft Certified Product (Windows 2003 Server) BlueDragon.NET is a .NET Connected product BlueDragon is a SQL Server 2005 Frontrunner New Atlanta Confidential. | 24 © Copyright 1997-2007

What BlueDragon Is & Does

CFML ≠ ColdFusion CFML is ColdFusion Markup Language CFML is code ColdFusion is Adobe's CFML application server ColdFusion is a software application Interprets CFML and generates output (HTML, PDF, etc.) You can deploy your CFML applications using ColdFusion BlueDragon is New Atlanta's CFML application server BlueDragon is a software application Interprets CFML and generates output (HTML, PDF, etc.) You can deploy your CFML applications using BlueDragon New Atlanta Confidential. | 25 © Copyright 1997-2007

BlueDragon 7.0

beta2 currently available Link on

New Atlanta home page

Feature complete: only bug fixes & performance tweaks anticipated prior to final release Release Candidate expected within at most a few weeks Final release expected several weeks thereafter

See the "What's New in BlueDragon 7.0" document on the New Atlanta website for full feature details

BlueDragon Future

Expect another major release in second half 2007 Windows Vista and IIS 7 integration Microsoft ASP.NET AJAX integration Ajax-based Rich Internet Applications Image processing (CFIMAGE enhancements) Administration and configuration enhancements Other features from Scorpio (CFMX8) (?) Visual Studio plug-in (?) New Atlanta Confidential. | 27 © Copyright 1997-2007

Got questions? Ask away!

Q&A

Let's give away some swag!

Swag Giveaway

Josh Adams Email: [email protected]

Phone: (678) 256-5395