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So far you ve been creating classes and objects with various changeable attributes. Attributes are data related to individual objects. A snake can have a length, a dog can have a name, and a cat can be of a certain color. What about the instructions I spoke of earlier How do you give your objects instructions to perform You define methods for each class. Methods are important in Ruby. They make objects do things. For example, you might want to add a bark method to your Dog class, which, if called on a Dog object, prints Woof! to the screen. You could write it like so:

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A common way to make program functionality available to remote programs is with Remote Procedure Calls (RPCs). In contrast to allowing control via a Web browser, RPC is designed for situations where one program gets to use the methods and procedures made available by another. When used correctly, using the methods and procedures made available by remotely located programs can feel almost as easy as using local methods and procedures. Ruby has built-in support for two of the most popular RPC protocols, XML-RPC and SOAP, as well as a special system of its own called DRb.

What Does the Road Ahead Look Like Sewing Up Understanding with BBP The Heart and Brain of BBP: The Story Template The Built-In Story Structure Theory Becomes Practical Step 1: Choose a Story Thread and a Pattern to Follow Step 2: Pull Through What s Most Important First Step 3: Guide the Visual and Verbal Strands with Your Storyboard Sketching the First Five Slides Sketching the Rest of the Slides Applying Custom Layouts Adding Graphics to the First Five Slides Adding Graphics to the Rest of the Slides Stepping into the Screen Presenting in Multiple Views Presenting with a Tablet PC Presenting Online Documenting the Experience Getting Started with the BBP Story Template Writing Headlines Using Three Ground Rules Rule 1: Write Concise, Complete Sentences with a Subject and a Verb in Active Voice Rule 2: Be Clear, Direct, Speci c, and Conversational Rule 3: Link Your Ideas Across Cells

Note Python for Microsoft Windows is distributed as a Windows Installer file, and requires that your Windows version supports Windows Installer 2.0 (or later). If you don t have Windows Installer, it can be downloaded freely for Windows 95, 98, ME, NT 4.0, and 2000. Windows XP already has Windows Installer, and many older machines will, too. There are download instructions for the Installer on the Python download page. Alternatively, you could go to the Microsoft download site, http://www.microsoft.com/downloads, and search for Windows Installer (or simply select it from the download menu). Choose the most recent version for your platform and follow the download and installation instructions. If you re uncertain about whether you have Windows Installer or not, simply try executing step 6 of the previous installation instructions, double-clicking the MSI file. If you get the install wizard, everything is okay. See http://www.python. org/2.4/msi.html for advanced features of the Windows Installer related to Python installation.

XML-RPC is a well-known RPC protocol that uses XML for its messaging and HTTP for its transport. One of the benefits of RPC is that you can create multiple programs in different languages, but still talk between them in a way that every language understands. It makes it possible to write a system in, say, PHP or Python, but call the methods made available by that program with Ruby.

by Ruby, although you re only likely to use it if the systems you want to use support nothing else. Other systems, particularly those that are a lot simpler such as REST are becoming more popular. However, if you want to use SOAP, Ruby comes with a SOAP library as standard.

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Calling an XML-RPC Enabled Method Calling a method made available over XML-RPC is incredibly simple:

require 'xmlrpc/client' server = XMLRPC::Client.new2("http://xmlrpc-c.sourceforge.net/api/sample.php") puts server.call("sample.sumAndDifference", 5, 3).inspect