[Ironruby-core] Code Review: RubyLibsAndYaml

Charles Oliver Nutter charles.nutter at sun.com
Sun May 18 19:26:40 EDT 2008

John Lam (IRONRUBY) wrote:
> Wayne Kelly:
>>> The mapping from Ruby library name to the assembly and namespace is
>> established via .rb files:
>>> thread.rb:
>>> load_assembly 'IronRuby.Libraries', 'Ruby.StandardLibrary.Threading'
>>> openssl.rb:
>>> load_assembly 'IronRuby.Libraries', 'Ruby.StandardLibrary.OpenSsl'
>>> The files are included in the solution and their build action is set
>>> to "copy if new", which means they are copied to the output directory
>>> during the build. ir.exe includes the directory it is located in into
>> the load paths list ($:), so the .rb files copied there are found by
>> the standard Ruby require/load mechanism.
>> So what if some legacy code requires 'thread.so' or 'opensll.so'? Can
>> we set it up so that it automatically loads the corresponding library?
> I'm not sure what the best solution to this problem is here - we should probably throw an exception if *.so/.dll does not refer to a .NET assembly. It's unlikely that existing code will require thread.so rather than thread.rb. Charlie - what does JRuby do in this case?

In Ruby, load path searching is partially determined by the extension. 
If you try to require a file with no extension, it looks first for that 
file with a .rb extension, then for that filename as a .so library (or 
.dll, or whatever the library extension is). If you try to load a file 
with no extension, it will only ever search for exactly that file with 
no extension.

In JRuby, we just use the .so/.dll as a marker for searching for 
extensions, skipping the search for .rb. And in the cases of 
thread.rb/thread.so, we just have a very small thread.rb file that loads 
our actual extension, thread.so. In fact, most of the code extensions we 
have defined to be .so, .rb, or sometimes both so that any load will 
find them.

- Charlie

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