Carl Jenkins wrote:
I was hoping I could expand on the thread a little bit...
I sort of understand modules, according to what I have read in my fancy
ruby book and this forum modules are like superclasses. But, what about
this < ?
Doesn't this allow a class to "become" a subclass of another by way of
inheritance. Not sure I am catching the difference between the two.
Modules should really not be used like superclasses--although
you are correct, an #included module does become an ancestor
of the #including class and method lookup follows this. The
commonly used name for the module behaviour is 'mixin'.
I personally prefer modules for mainly two cases:
1) 'Intersecting' behaviour, something that is added to multiple
classes as an enhancement but does not really make the classes
'related' enough for an inheritance relationship.
2) Variable composition--a class can be customised/enabled/disabled
for certain tasks by adding/withholding/changing its module
composition. This can, of course, also be achieved by either
actual composition by variables or then by subclassing.
Also, I am not quite sure I understand how namespaces works in ruby.
In java you create a package ( i know you all know this already I am
just saying it for my benefit) to place related classes in. Say for
example com.jenkins.util.MyFancyClass. If I want to use this class in
another package com.jenkins.library any classs in library would just
import it. How does this work in ruby?
Most of the code I have seen is in the same class or at least the same
direcctory. Is it typical for ruby applications to create a package
structure similar to a java app?
The namespace, unlike in Java, is in no way enforced and it
cannot be used to resolve a file's location in the filesystem.
It is strictly a convenience to give the code some structure
and to insulate it from namespace clashes.
It is certainly possible to put your code in a similar namespace
to what you would use in Java:
Typically, though, only the ProjectName/LibraryName downwards
I think the most common file layout is the one required by
install.rb/setup.rb (see http://raa.ruby-lang.org) or, more
Thanks for your time!
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