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XML-RPC is a simple set of specifications and software that lets distributed applications talk to each other. It is based on exchanging XML messages over HTTP. You ll find plenty of documentation and information about the vibrant XML-RPC community at http://www.xmlrpc.com/, the official web site for XML-RPC. XML-RPC is a protocol that makes remote procedure calling possible. It uses the HTTP POST method for this purpose. The XML payload is sent as the body of an HTTP POST request, and responses also come back as XML. XML-RPC supports basic types like strings, numbers, and dates, as well as complex types like lists and records. You can get details about the request-and-response format by reading the specification, available online at http://www.xmlrpc.com/spec. There are two entities involved in an XML-RPC communication. They play the roles of the client and the server. When you integrate Flex and Java using XML-RPC, you can usually expect Flex to be the client and Java to be the server. Therefore, we present an example application here to illustrate that XML-RPC use assumes the same roles. Let s start with the server. To get it up and running, do the following: 1. Create a class with a few methods. In this case, create a very simple Java class that joins two strings and reverses a given string, using code that looks like this:

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package org.shanky.flex.examples.xmlrpc; public class StringManipulator { public String joinString (String firstString, String secondString) { return firstString + secondString; } public String reverseString (String sourceString) { int i, len = sourceString.length(); StringBuffer dest = new StringBuffer(len); for (i = (len - 1); i >= 0; i--) dest.append(sourceString.charAt(i)); return dest.toString(); } }

his chapter lays the groundwork for an occasional, open-ended series of writings on the general subject of logical difference. It also explores the companion notion of logical sameness. Note: I ve discussed the concept of logical difference in several previous writings, but the treatment that follows is at least partly new. Overall, it s meant to serve as a central point of reference for future writings by myself and others on this same general topic.

Figure 5-15. When gdebi has done its work, your bug workaround is complete and Synfig Studio is ready for use.

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If you re familiar with my contributions to the website http://www.dbdebunk.com or various other writings by myself especially the book I wrote with Hugh Darwen, Databases, Types, and the Relational Model: The Third Manifesto, 3rd edition (Addison-Wesley, 2006), referred to hereinafter as simply the Manifesto you ll be aware that I often appeal in my writings to the notion of logical difference. That notion is one I find extraordinarily useful in my own work; it s a great aid to clear and precise thinking (not that my thinking is always as clear and precise as it might be, I m sorry to say). I also find it helpful when I m trying to understand, learn, and inwardly digest the contributions of others in the database field. And, last but certainly not least, I find it an extremely useful mind tool when I m trying to pinpoint and analyze some of the confusions that are, unfortunately, all too common in that same field. It s a rock to cling to in what can sometimes seem to be an ocean of muddle. The intent of what follows, then, is to offer a brief general introduction to the concept of logical difference and thereby to set the scene for an occasional and open-ended series of writings on specific important examples of that concept.

Configure and set up an XML-RPC server. We won t create one here because there are many good ones available already, and it s easy to include them in a Java web application. Expose the methods of your class so that they could be invoked remotely over XML-RPC.

If it hadn t been for the fact that it doesn t exactly trip off the tongue, the title for this chapter might well have been Some Logical Differences or Fundamental Distinctions that Lie at the Heart of the Database Field. It s my claim perhaps better, my thesis that many of the confusions we encounter in the literature (in object database writings in particular) derive from confusion over one or other of the fundamental logical differences I ll be discussing in this series. And I plan to produce a considerable body of evidence to buttress this thesis, both in the present chapter and in subsequent ones.

It s best to start your experimentation with Synfig Studio by creating a simple background and an object to be the actor this can be as basic as a bouncing ball, for the purposes of learning the ropes. You achieve animation with this program by creating key frames along a timeline, which are similar to the cartoon frames in your storyboard. The application fills in all the intervening positions automatically, using the process of tweening that you read about earlier in this chapter.

Choose the XML-RPC implementation from Apache, called Apache XML-RPC, for the example application in this chapter. Information and downloads related to the Apache XML-RPC implementation are accessible at http://ws.apache.org/xmlrpc/index.html. The Apache XML-RPC server can be effortlessly included in a Java web application (a servlet container or a Java EE application server). You should use Tomcat. The first thing you do is to download the latest stable release of the software. Get the binary version of the distribution (the file ending with extension .bin.tar.gz), unless you intend to modify the source code. Copy the following files from the lib directory of the distribution to your WEB-INF/lib folder: