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Ch apt er 10 Dep L OYING r U B Y a p p L IC a tIONS a N D LI B r a r I e S
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Note You need to change the druby:// URL in the client example to match the URL given in output by
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the server example.
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With DRb, data structures work almost seamlessly across the connection. If your remote classes want to return complex hashes, they can, and they ll be represented perfectly on the client. To an extent, using an object over a DRb connection is transparent, and the object will act as if it were local. This is only a simple overview of the basics of DRb. However, in terms of DRb s basic RPC features, this simple server-and-client example demonstrates the core of DRb s feature set, and you can extend it to almost any complexity. If your code is already written using classes, you might be able to drop DRb in within minutes and immediately get your functionality working from afar.
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For more DRb tutorials, refer to the links provided in the most recent documentation at http:// Tip
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In this chapter, we ve looked at how to deploy Ruby programs and libraries, as well as how to make their functions available to web browsers and other applications over a network. We ve also interrogated the environment so we can pursue different techniques on a per operating system basis if we choose. Let s reflect on the main concepts covered in this chapter: Shebang line: A special line at the start of a source code file that determines which interpreter is used to process the file. Used primarily on Unix-based operating systems, shebang lines can also work on Windows when used with the Apache web server. RUBY_PLATFORM: A special variable preset by Ruby that contains the name of the current platform (environment). Environment variables: Special variables set by the operating system or other processes that contain information relevant to the current execution environment and information about the operating system. RubyForge: A centralized repository and web site dedicated to hosting and distributing Ruby projects and libraries. You can find it at http://rubyforge.org/. GitHub: A popular hub and community site for users of the Git source code management system now popular in the Ruby world. You can find it at http://www.github.com/. CGI: Common Gateway Interface. A standard that enables web servers to execute scripts and provide an interface between web users and scripts located on that server.
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WEBrick: A simple and easy HTTP server library for Ruby that comes with Ruby as standard. Mongrel: A more powerful HTTP server library for Ruby by Zed Shaw that improves significantly upon WEBrick s speed, stability, and overall performance. RPC (Remote Procedure Call): A way to call methods in a different program using a network (either local or the Internet), a transport protocol (such as HTTP), and a messaging protocol (such as XML). XML-RPC: An RPC protocol that uses HTTP and XML for its transport and messaging. SOAP (Simple Object Access Protocol): Another RPC protocol that uses HTTP and XML for its transport and messaging. DRb (Distributed Ruby): A Ruby-only mechanism for implementing RPCs and object handling between separate Ruby scripts.
In 15, we re going to return to looking at network servers, albeit in a different fashion; but first, in 11, we re going to take a look at some more advanced Ruby topics to flesh out the ideas we ve covered so far.
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Chap ter
advanced ruby Features
n this chapter, we re going to look at some advanced Ruby techniques that have not been covered in prior chapters. This chapter is the last instructional chapter in the second part of the book, and although we ll be covering useful libraries, frameworks, and Ruby-related technologies in Part 3, this chapter rounds off the mandatory knowledge that any proficient Ruby programmer should have. This means that although this chapter will jump between several different topics, each is essential to becoming a professional Ruby developer. The myriad topics covered in this chapter include how to create Ruby code dynamically on the fly, methods to make your Ruby code safe, how to issue commands to the operating system, how to integrate with Microsoft Windows, and how to create libraries for Ruby using other programming languages. Essentially, this chapter is designed to cover a range of discrete, important topics that you might find you need to use, but that fall outside the immediate scope of other chapters.
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