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Some algorithms are best expressed recursively. Although all recursive algorithms can be solved by using imperative programming, it is not always the best way to express these algorithms. For example, the greatest common divisor function shown previously is three lines when expressed recursively. If you expressed it imperatively, it would take eight lines and would not be nearly as clear: let imperative_gcd x y = let a = ref x in let b = ref y in while (a.contents > 0) do let m = a.contents in ( a := b.contents mod a.contents; b := m ) done;b.contents;; They both yield the same answers, though, and both perform the same task: # # greatest_c_div 5436 7212;; : int = 12 imperative_gcd 5436 7212;; : int = 12

Summary

Figure 17-9. Fiddler as a proxy With Fiddler set as the intercepting proxy, all traffic to the browser will flow through it first, as shown in Figure 17-10. With Fiddler intercepting HTTP traffic, we re now able to monitor the incoming and outgoing request/response packages. We ve already taken a pretty good look at traffic monitoring earlier, so I really want to concentrate on a debugging capability that I ve overlooked until now. Fiddler has the ability to step through HTTP transactions by first enabling breakpoints and then moving through each traffic process. Let s take a look at a sample Fiddler debugging session by stepping through a working site. First start Fiddler and open a browser window. Visit Microsoft.com inside of your browser. You ll see a pretty good request/response flow run through Fiddler, as shown in Figure 17-11.

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4 covers recursion extensively in the function discussion. If you are having some trouble with recursion, don t be discouraged; almost everyone has some difficulty with the concept.

In this chapter, you learned how you can create beautiful graphs in just a few lines of code with graphing libraries like Gruff and Scuffy. You saw how to use Active Record and Gruff to extract data from a database, and then create a graph from it with relatively simple code. The Transmegtech Studios examples demonstrated how to take business data, use Active Record to summarize the data into a useful form, and then use Gruff to present it. You created detailed reports on an entire staff of people in just 77 lines of code! So far, you ve learned how to perform calculations using Active Record and how to use Gruff to create attractive charts. However, these tasks are only part of a large project. Presenting the data to the users in a way they can use it is also important. The next chapter explains how you can let users view and manipulate data on their desktop.

When a client makes a request to a Shoutcast server, it sends a specially formatted request to the server that looks like this: GET path/to/the/file HTTP/1.0 <CRLF> Icy-MetaData:1 <CRLF> <CRLF> This is pretty much a normal HTTP GET request, except for the inclusion of Icy-MetaData:1, which tells the server that it should send metadata with the stream. The server defined in this chapter always sends the metadata and ignores the specifics of the request. You can ignore the specifics of the request because the server has only one stream. Many full-featured Shoutcast servers enable you to create multiple streams from the same server. If you want multiple streams from the server, you have to run them on different ports.

If we want to see each of the steps on an individual basis, as they load, we ll need to first turn on the breakpoint system within Fiddler. We find that option under Rules Automatic Breakpoints, as shown in Figure 17-12.

n the previous chapters, you ve learned about creating reports using Active Record. However, it s not enough to simply create a report; you need to place the report in a context where it will be useful. Often, this means making the report accessible on the users desktop in a format that s familiar to them. You can accomplish this in a number of ways, as you ll learn in this chapter.

After getting a request, the server sends the header information followed by the stream data. The headers will look something like this: ICY 200 OK <CRLF> icy-name:Ocaml Rocks! <CRLF> icy-metaint:1024 <CRLF> Content-Type:audio/mpeg <CRLF> icy-pub:1 <CRLF> These headers tell the client some very important things. They tell the client that the request was successful; they also tell the client what the name of the stream is (icy-name), how many bytes will pass between metadata updates (icy-metaint), what content type is being streamed (in this case, mpeg audio data), and whether the server is public or private (icy-pub). The metadata updates in the stream are very important. One major shortcoming of the MP3 standard is that it does not include any way of encoding information about the data (for example, the name of the song being played, the artist, and so on).

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