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Development of TRGnomoradio

Development of TRGnomoradio. By Dan Stevens. Alternatives to the GarageBand rating system. iRate, Gnomoradio, Indy All based on finding music that you like, rather than what everyone else likes. Gnomoradio was the only one available at the time that allowed me to submit my music.

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Development of TRGnomoradio

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  1. Development of TRGnomoradio By Dan Stevens

  2. Alternatives to the GarageBand rating system • iRate, Gnomoradio, Indy • All based on finding music that you like, rather than what everyone else likes. • Gnomoradio was the only one available at the time that allowed me to submit my music.

  3. TCGnomoradio • Official Gnomoradio client is Linux only! • So I’ll write my own client. • I can make it play stuff through Winamp! • It’ll be an excuse to better learn C# • Windows users will love me.

  4. Winamp • Playback is central – do this first. • Ripped off some dude’s IPC code. • IP API Missing functionality! • No reasonable way to find filename of currently playing song • Use a plugin that can get that information • HttpQ – a simple HTTP interface to Winamp • Now I can talk to Winamp. Yay!

  5. Gnomoradio Consists of • Client • Protocols • Song info • Servers • I only need to worry about interfacing with existing protocols, and designing my own client.

  6. Bu7 what iz t3h pr0tocal? • Anything but documented. • Use the source, Luke. • And then if you’re still confused, use the mailing list. • Then write it up and stick it on http://www.uwplatt.edu/~stevenda/projects/TCGnomoradio/protocols.html

  7. Network architecture A.k.a. TOGoS learns about PowerPoint diagrams. http / xml

  8. Implementaion Time! • First, write a front end that allows me to test things. • Write protocol mod-ules and test usingthe GUI. • … • Profit!

  9. C# is a pain #region RainbowHubSearch private string[] RainbowHubSearch( string resourcename ) { string[] results; try { this.RainbowHubClient.Lock(); results = this.RainbowHubClient.FindResource( resourcename ); } finally { this.RainbowHubClient.Unlock(); } return results; } private delegate string[] RainbowHubSearchDelegate( string resourcename ); private void RainbowHubSearchButton_Click(object sender, System.EventArgs e) { RainbowHubSearchDelegate del = new RainbowHubSearchDelegate( this.RainbowHubSearch ); del.BeginInvoke( this.RainbowHubSearchBox.Text, new AsyncCallback( this.RainbowHubSearchDone ), null ); } private void RainbowHubSearchDone( IAsyncResult result ) { AsyncResult aresult = (AsyncResult)result; RainbowHubSearchDelegate del = (RainbowHubSearchDelegate)(aresult.AsyncDelegate); string[] results = (string[])del.EndInvoke( result ); if( (results != null) && (results.Length > 0) ) { this.RainbowHubSearchResultsBox.Items.AddRange( results ); } } #endregion

  10. Insight from a Ruby Fan • People need design documents because their languages are not HL enough. • C# kinda sucks: • Why do I have to declare delegate types? • Or event types? • Why do I have to do any static typing? • Why do I have to declare new methods instead of using inline code blocks? • I will rewrite in Ruby!

  11. Why Ruby is Grate # String processing (as in Perl) line.strip =~ /^thing #(\d+)$/ # Objects (like Smalltalk, Java, or C#) class FooBar def initialize( num ) @num = num end end FooBar.new( someobject.someproperty )

  12. Why Ruby is Grate (part 2) # Easy to write # * No static typing # * No semicolons # Easily pass code blocks around MyObject.method do |arg1,arg2| # Inline callback! arg1.to_i + arg2 / 5 End # Good for loops Dir.each(‘/home/tog’) do |fn| puts “found file: #{fn}” end

  13. Why Ruby is Grate (part 3) class MyClass def initialize( &proc ) @proc = proc end def result @result ||= @proc.call() end end o = MyClass.new { # expensive operation } p o.result p o.result

  14. Why Ruby is Grate (part 4) require 'TOGoS/Event‘ class MyClass event :sandwich_eaten def eat_sandwich() @sandwich_eaten.trigger( self,1,2,3 ) end End myobj = MyClass.new() myobj.sandwich_eaten.subscribe() do |sender,*args| puts “Teh sandwich was eaten. Here are some args: #{args}” end myobj.eat_sandwich() Teh sandwich was eaten. Here are some args: 123

  15. Why Ruby ain’t perfect • No kernel-level threads • Causes problems when making calls into C code that may take a long time • Developer community not as large as for other languages (Perl, Python) • This is not really a big problem • Slow • Lack of static typing and stack-allocated structures • But it’s still great for a lot of things. • Web servers, page generators, WAD compilers.

  16. TRGnomoradio • Written in Ruby • Because I am more experienced • And because Ruby is grate • Uses a web-based UI • Because I am more experienced • More flexibly generate tables and display data structures in HTML than with GUI widgets • No expectation of fields updating in real time • Let the browser worry about multiple tabs • I need a web server, anyway! • Ruby + Web interface => Cross platform

  17. SS4 and TRServ2 • Libraries that grew out of a file-sharing project I started in 11th grade called “SpookShare” • My big ‘learn Perl but totally misunderstand references, then re-write in PHP and MySQL’ project. • SS2 was written in Ruby and included it’s own web server, TRServ • SS3: SS2 but using different peer-discovery protocols • Became a hacky framework for selecting modules and setting options (TRVousor LiveJournal, advertise or not, etc) • Re-wrote TRServ into TRServ2 to better support HTTP/1.1 • SS4: a well-designed framework for selecting modules and setting options • Easy to write plugin modules for anything ruby • Basically a big hashtable and a configuration language

  18. TRGnomoradio (part 2) • Embedded TRServ2 as an SS4 module • Wrote libraries, made forms and links to test various functions • Wrote some back-end logic to download information on recommended songs • Wrote some front-end logic to display that information • Tried to run on my Windows box to try with Winamp…

  19. TRGnomoradio (part 3) • resolv-replace doesn’t seem to work on Win. • Might have something to do with me being behind a firewall? • I’m busy doing homework. • This project got boring. • The Gnomoradio project seems to be a bit deadish. • Gnomoradio.org has annoying bugs that I can’t work around

  20. Comparing to a standard development model • TOGoS-style development • Emphasizes getting something to work • Good for short-term projects • Good for single developer, or a small team if work can be split up easily • Rowe-style development • Emphasizes design and documentation • Good for long-term projects • Good for large teams, especially when components will have complex interfaces

  21. Comparing to a standard development model (part 2) • TOGoS-style development • Very little overhead. • Requires programmers to know what they’re doing. • Involves a lot of re-factoring. • Generalize functionality for later use so that the next project is easier • Rowe-style development • Loads of overhead. • Programmers can be total idiots, because they are not necessarily doing design. • Involves following the friggin’ design.

  22. Comparing to a standard development model • TOGoS-style development • We love Ruby • Grunt work is frustrating and is a distraction from high-level architecture • Rowe-style development • Clunkier languages like Java or C# are not such a problem • Make the code monkeys do the grunt work of typing “public static void” a million times. • Static typing is more useful for ensuring sanity

  23. Fin Unless I forgot to say something

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