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#43721

I?aki Baz Castillo (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?

Hi, I use Logger class in a programm and since I need to log in lot of different places (into classes, into methods...) I use a global variable in this way: $log = Logger.new $log.debug ... so I can use $log anywhere in the code. Is it ellegant and the Ruby way ? The other possibility I see is creating a class that stores the logger instance into a @@class_variable (@@logger) and call class method anywhere in the code: class MyLogger @@logger = Logger.new def self.debug(x) @@logger.debug(x) end ... end MyLogger.debug ... Which is a more ellegant way? is there other option? Thanks for any advice I could receive from you.

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#43722

Suraj Kurapati (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?
$log = Logger.new $log.debug ... The other possibility I see is class MyLogger @@logger = Logger.new def self.debug(x) @@logger.debug(x) end end MyLogger.debug ... is there other option? You could add a debug() method to the Kernel module: module Kernel @@logger = Logger.new def debug message @@logger.debug message end end Then you could call it from anywhere in your code.

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#43723

I?aki Baz Castillo (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?

$log = Logger.new $log.debug ... The other possibility I see is class MyLogger @@logger = Logger.new def self.debug(x) @@logger.debug(x) end end MyLogger.debug ... is there other option? You could add a debug() method to the Kernel module: module Kernel @@logger = Logger.new def debug message @@logger.debug message end end Then you could call it from anywhere in your code. Oh, interesting. Anyway let me a question: How ellegant is using Kernel module? Imagine you are programming a _frame_work that others can use in their programms. Isn't dangerous to extend/modify Kernel module since it will be shared by *all* the code? Thanks a lot.

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#43724

Suraj Kurapati (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?

Imagine you are programming a _frame_work that others can use in their programms. Isn't dangerous to extend/modify Kernel module since it will be shared by *all* the code? True. In that case, I would put the debug() method or the LOG _object_ in the top-level module of my library/_frame_work: # Using a debug() method module FooBar module Logging @@logger = Logger.new def debug msg @@logger.debug msg end end class FooBar::Baz include Logging # <== NOTE this! def oh_no debug oh no! end end end # Using a LOG _object_ module FooBar LOG = Logger.new class FooBar::Baz def oh_no LOG.debug oh no! end end end

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#43725

I?aki Baz Castillo (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?
# Using a LOG _object_ module FooBar LOG = Logger.new class FooBar::Baz def oh_no LOG.debug oh no! end end end Ok, in this case you use a constant (LOG). This is the same I do now but I use a global variable ($log). Is more ellegant using a constant? Thanks a lot.

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#43726

Suraj Kurapati (Visitor)

ruby use system variable Is it ellegant to use a global variable to store a Logger object?

# Using a LOG _object_ module FooBar LOG = Logger.new class FooBar::Baz def oh_no LOG.debug oh no! end end end Ok, in this case you use a constant (LOG). This is the same I do now but I use a global variable ($log). Is more ellegant using a constant? Yes, in my opinion. A constant is constrained to the walls of your library's top-level module, whereas a global variable is not. Therefore, unless someone was modifying your library, they would not be able to access your constant.

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