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Versions: 10
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Stored size: 1.7 KB
Contents
require "map"
require "active_support/concern"
require "active_support/dependencies"
require "mvcli/loader"
module MVCLI
module Provisioning
extend ActiveSupport::Concern
UnsatisfiedRequirement = Class.new StandardError
MissingScope = Class.new StandardError
module ClassMethods
def requires(*deps)
deps.each do |dep|
self.send(:define_method, dep) {Scope[dep]}
end
end
end
class Scope
def initialize(command, provisioner)
@command = command
@provisioner = provisioner
end
def [](name)
name.to_s == "command" ? @command : @provisioner[name]
end
def evaluate
old = self.class.current
self.class.current = self
yield
ensure
self.class.current = old
end
def self.current
Thread.current[self.class.name]
end
def self.current!
current or fail MissingScope, "attempting to access scope, but none is active!"
end
def self.current=(scope)
Thread.current[self.class.name] = scope
end
def self.[](name)
current![name] or fail UnsatisfiedRequirement, "'#{name}' is required, but can't find it"
end
end
class Provisioner
def initialize
@loader = Loader.new
@providers = Map.new
end
def [](name)
unless provider = @providers[name]
provider = @providers[name] = @loader.load :provider, name
end
provider.value
end
end
class Middleware
def call(command)
Scope.new(command, Provisioner.new).evaluate do
yield command
end
end
end
::Object.send :include, self
end
end
Version data entries
10 entries across 10 versions & 1 rubygems