Module: OSGi::BundleResolvingStrategies

Defined in:
lib/osgi/resolving_strategies.rb

Overview

Functions declared on this module are used to select bundles amongst a list of them, when requiring bundles through the Require-Bundle header. Functions must have the signature (bundles)

where 
  bundles: an array of bundles

Class Method Summary collapse

Class Method Details

.latest(bundles) ⇒ Object

Default strategy: the bundle with the highest version number is returned.



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# File 'lib/osgi/resolving_strategies.rb', line 72

def latest(bundles)
  bundles.sort {|a, b| a.version <=> b.version}.last
end

.oldest(bundles) ⇒ Object

The bundle with the lowest version number is returned.



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# File 'lib/osgi/resolving_strategies.rb', line 79

def oldest(bundles)
  bundles.sort {|a, b| a.version <=> b.version}.first
end

.prompt(bundles) ⇒ Object

Default module function that prompts the user to select the bundle he’d like to select as dependencies.



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# File 'lib/osgi/resolving_strategies.rb', line 86

def prompt(bundles)
  bundle = nil
  while (bundle.nil?)
    puts "Choose a bundle amongst those presented:\n" + bundles.sort! {|a, b| a.version <=> b.version }.
    collect {|b| "\t#{bundles.index(b) +1}. #{b.name} #{b.version}"}.join("\n")
    number = $stdin.gets.chomp
    begin
      number = number.to_i
      number -= 1
      bundle = bundles[number] if number >= 0 # no negative indexing here.
      puts "Invalid index" if number < 0
    rescue Exception => e
      puts "Invalid index"
      #do nothing
    end
  end
  bundle
end