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Contents
# encoding: utf-8
# This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
require 'dependency_detection/version'
module DependencyDetection
module_function
@@items = []
def defer(&block)
item = Dependent.new
item.instance_eval(&block)
@@items << item
end
def detect!
@@items.each do |item|
if item.dependencies_satisfied?
item.execute
end
end
end
def dependency_by_name(name)
@@items.find {|i| i.name == name }
end
def installed?(name)
item = dependency_by_name(name)
item && item.executed
end
class Dependent
attr_reader :executed
attr_reader :name
def executed!
@executed = true
end
attr_reader :dependencies
def initialize
@dependencies = []
@executes = []
end
def dependencies_satisfied?
!executed and check_dependencies
end
def execute
@executes.each do |x|
x.call
end
ensure
executed!
end
def check_dependencies
dependencies && dependencies.all? { |d| d.call }
end
def depends_on
@dependencies << Proc.new
end
def executes
@executes << Proc.new
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems