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GServer is a Ruby library that comes in the standard library and implements a generic server system. It features thread pool management, logging, and tools to manage multiple servers at the same time. GServer is offered as a class, and you produce server classes that inherit from it. Other than simple management, GServer also allows you to run multiple servers at once on different ports, allowing you to put together an entire suite of services in just a few lines of code. Threading is entirely handled by GServer, although you can get involved with the process if you like. GServer also implements logging features, although again, you can provide your own code for these functions if you wish. Let s look at the simplest TCP server possible with GServer: require 'gserver' class HelloServer < GServer def serve(io) io.puts("Hello!") end end server = HelloServer.new(1234) server.start server.join This code implements a basic server that simply outputs the word Hello! to any client connecting to port 1234. If you telnet to connect to port 1234 (or even a web browser, using http://127.0.0.1:1234/), you ll see the string Hello! returned to you before the connection is closed. In this example, you create a server class called HelloServer that descends from GServer. GServer implements all the thread and connection management, leaving you with only a handful of technicalities to worry about. In this simple example, you only create a single server process, tell it to use port 1234, and start it immediately. However, even this simple example will work with multiple clients, and if you telnet to it multiple times in parallel, you ll find that all requests are processed successfully. However,

(see Figure 5-6). Let s take a few moments and play around with this DataGrid to explore some of its features. First of all, if you click any of the column headers, you will notice that sorting is automatically available, as shown in Figure 5-7. Next, if you place your cursor at the edge of one of the columns, you can use the mouse to click and drag the column s edge to resize the column, as shown in Figure 5-8. Again, this functionality is provided for free with the DataGrid s rich client-side functionality. And finally, if you click and hold the mouse on one of the column headers, then drag it left or right to another column header s edge, you will see a little red triangle appear above the columns. For instance, click and drag the Name column so the little red triangle appears to the far right, as shown in Figure 5-9. When the red triangle is where you want it, release the mouse, and you will see that the Name column now appears as the last column in the DataGrid.

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nPEtER COOPER is an experienced Ruby developer and trainer, and editor of Ruby Inside (http://www.rubyinside.com/), the most popular Ruby news site. In 2005 he founded Feed Digest, a Railspowered RSS feed processing and redistribution service, for which he was profiled in Business 2.0 magazine and that he went on to sell in 2007. Since 2004, Peter has developed many commercial web sites using Ruby on Rails, the Ruby-based web framework. In addition, he created Code Snippets (http://snippets.dzone.com/), one of the Web s largest public code repositories, which he sold to DZone in 2007. In addition to development work, Peter has written professionally about various development techniques and tools since 1998. He lives in Lincolnshire, England, with his wife, Laura.

naLaN BRaDBURNE has been working with Rails full time since 2005 and is the author of Practical Rails Social Networking Sites (Apress, 2007). He currently develops Rails applications for a number of startups and is CTO of furnish.co.uk. Alan has more than 12 years of experience in the web and mobile industries, and has worked for Motorola, Nextel, and Sun Microsystems, along with a number of Internet startups. In 2002, he created Phlog.net, one of the world s first mobile photo blogging communities. He lives in Reading, England, with his wife, Mayumi. You can find him online at http://alanbradburne.com.

Figure 3-47. The Condiments table Finally, Figure 3-48 shows the values in the Stuffs table, which includes a single many-to-one relationship: Order 4 has two Stuff values (Grilled Tofu and Portabella). Again, this is confirmed by the expression of the fourth order in the list: Grilled Tofu & Portabella in Pita with Lettuce. So the database instances appear to be entirely consistent with the model.

Now that you have implemented a simple DataGrid example, let s explore some of the additional options available.

t is often said that writing is a lonely task, but it s not until you write a book that you realize the process has to be anything but lonely Without the help and reassurance of the large team of people backing this book, and backing me personally, this book could not have been written My first thanks go to Keir Thomas, who approached me with the idea of writing a Ruby book back in 2005 He gave me great freedom over the scope and specification of the book, and was the most essential piece of the puzzle in getting the book approved and everything sorted out in the early stages Beth Christmas of Apress deserves a special thanks for her superb project management and constant reassurance during the writing of this book in both its editions so far.