Is there require method implementaion, which loads library in the
specified module context.
I want to store the classes with same name but different functionality
in one ruby process. So modules are the right thing I think.
–
Eugene Scripnik
IT Group
Software Architect
Tel./Fax +380 (372) 58-43-10
email: Eugene.Scripnik@itgrp.net
http://www.itgrp.net/
maybe
YourModule.module_eval %q{ require ‘Foo’ }
or
YourModule.module_eval %q{ load ‘Foo.rb’ }
does the trick
robert
“Eugene Scripnik” Eugene.Scripnik@itgrp.net schrieb im Newsbeitrag
news:3E6753BE.7040109@itgrp.net…
Is there require method implementaion, which loads library in the
specified module context.
I want to store the classes with same name but different functionality
in one ruby process. So modules are the right thing I think.
Something like this one?
It has additional features like ability to load plugins from other plugins
by saying ‘require “”’ in the plugin’s code. Note <> in
require’s argument. Another feature is correct reporting of errors in
loaded plugin (not ‘Error in eval…’ but ‘Error in foo.rb:12345’).
On Thu, Mar 06, 2003 at 11:04:42PM +0900, Eugene Scripnik wrote:
Is there require method implementaion, which loads library in the
specified module context.
I want to store the classes with same name but different functionality
in one ruby process. So modules are the right thing I think.
module Plugin
# Instantiates a new module mod_name under Plugin hierarchy which incapsulates requested plugin
# code from file_name source file.
def self.instantiate(mod_name, file_name)
# Create new module and set a proper binding information for it
# If you change the code below, adjust number of skipped lines appropriately.
# Line with #{File.open(“#{file_name}”, “r”){|f| f.read}} is treated as ‘line #1’
# The third argument to module_eval must contain a negative offset of ‘module #{mod_name}’
# from ‘line #1’. If you keep this as is, you’ll see meaningful error messages which will
# point to proper positions in your plugins if something wrong will happen
begin
mod = module_eval(<<EOF, file_name, -13 )
module #{mod_name}
class <<self
def require (amodule)
if amodule =~ /^<([^>]+)>/
fmod = ::PluginLoader.registry[$1]
if not (fmod.class === Module)
fmod = ::PluginLoader.registry.require(amodule)
end
else
Kernel.require amodule
end
end
end
#{File.open("#{file_name}", "r"){|f| f.read}}
self
end
EOF
rescue Exception => err
log 1, “Syntax Error in plugin #{mod_name}, #{file_name}, not loading”
STDERR.puts “Syntax Error in plugin #{mod_name}, #{file_name}, not loading:”
STDERR.puts “#{err.message}”
mod = false
end
return mod
end
end
module PluginLoader
class Registry < Hash
def initialize(plugin_path)
@plugin_path = plugin_path
end
def require(plugin)
if plugin =~ /^<([^>]+)>/
amodule = $1
return self[amodule] if self[amodule].class === Module
mod_name = amodule.to_s.gsub(/\//,"_").gsub(/\.(rb|so)/,"").capitalize
@plugin_path.each do |path|
[".rb", ".so", ""].each do |ext|
file_name = "#{path}/#{amodule}#{ext}"
if FileTest.file?(file_name)
mod = ::Plugin.instantiate(mod_name, file_name)
self[amodule] = mod if mod
return mod
end
end
end
else
Kernel.require plugin
end
end
end
class <<self
attr_reader :registry
def init_plugins(*path)
@registry = Registry.new(path)
end
def load_plugins(*plugins)
result = false
plugins.each do |plugin|
if @registry[plugin] || (@registry.require("<#{plugin}>").class === Module)
result = true
else
result = false
end
end
result
end
# Form list of loaded plugins
def list_plugins
PluginLoader.registry.values
end
end
end
One does not thank logic.
– Sarek, “Journey to Babel”, stardate 3842.4
Hi,
In message “Module#require” on 03/03/06, Eugene Scripnik Eugene.Scripnik@itgrp.net writes:
Is there require method implementaion, which loads library in the
specified module context.
Usually, general purpose libraries are not designed to be loaded in
the specific module. If you want to load some amount of code in the
module context, how about
SomeModule.module_eval(open(path).read)
?
matz.
Robert Klemme wrote:
maybe
YourModule.module_eval %q{ require ‘Foo’ }
or
YourModule.module_eval %q{ load ‘Foo.rb’ }
does the trick
Unfortunately it doesn’t. require and load without second parameter load
library globally. Your code above is equivalent to
module YourModule
require ‘Foo’
end
–
Eugene Scripnik
IT Group
Software Architect
Tel./Fax +380 (372) 58-43-10
email: Eugene.Scripnik@itgrp.net
http://www.itgrp.net/
Alexander Bokovoy wrote:
Something like this one?
It has additional features like ability to load plugins from other plugins
by saying ‘require “”’ in the plugin’s code. Note <> in
require’s argument. Another feature is correct reporting of errors in
loaded plugin (not ‘Error in eval…’ but ‘Error in foo.rb:12345’).------------------------------------------------------------------------------------------
Plugin loader interface
The content of this file is available under GNU LGPL
Thank you for fast report, I need to explore your code to understand it
fully.
(C) 2003 Alexander Bokovoy, a.bokovoy@sam-solutions.net
(C) 2003 Yuri Leikind, y.leikind@sam-solutions.net
–
Eugene Scripnik
IT Group
Software Architect
Tel./Fax +380 (372) 58-43-10
email: Eugene.Scripnik@itgrp.net
http://www.itgrp.net/
Yukihiro Matsumoto wrote:
Hi,
Is there require method implementaion, which loads library in the
specified module context.Usually, general purpose libraries are not designed to be loaded in
the specific module. If you want to load some amount of code in the
module context, how aboutSomeModule.module_eval(open(path).read)
First I need to search all standard paths for library and then read all
data from file like in your code above and at last do something with all
those (eval): to point to exact file. This is what
Kernel.require (or Kernel.load) actually do, but slightly modified.
Hmm, looking at Alexander Bokovoy’s sources I realize that second
parameter to module_eval will change the default (eval) to passed file name.
Just thought there is easier way to achieve what I need.
In message “Module#require” > on 03/03/06, Eugene Scripnik Eugene.Scripnik@itgrp.net writes:
–
Eugene Scripnik
IT Group
Software Architect
Tel./Fax +380 (372) 58-43-10
email: Eugene.Scripnik@itgrp.net
http://www.itgrp.net/