Sha256: 599a094dfb27bea3c5f64bb8586086253194d090c68f9612f78b8d1540a3e11f
Contents?: true
Size: 1.34 KB
Versions: 10
Compression:
Stored size: 1.34 KB
Contents
# Puppet::Context is a system for tracking services and contextual information
# that puppet needs to be able to run. Values are "bound" in a context when it is created
# and cannot be changed; however a child context can be created, using
# {#override}, that provides a different value.
#
# @api private
class Puppet::Context
require 'puppet/context/trusted_information'
class UndefinedBindingError < Puppet::Error; end
class StackUnderflow < Puppet::Error; end
# @api private
def initialize(initial_bindings)
@stack = []
@table = initial_bindings
@description = "root"
end
# @api private
def push(overrides, description = "")
@stack.push([@table, @description])
@table = @table.merge(overrides || {})
@description = description
end
# @api private
def pop
if @stack.empty?
raise(StackUnderflow, "Attempted to pop, but already at root of the context stack.")
else
(@table, @description) = @stack.pop
end
end
# @api private
def lookup(name, &block)
if @table.include?(name)
@table[name]
elsif block
block.call
else
raise UndefinedBindingError, "no '#{name}' in #{@table.inspect} at top of #{@stack.inspect}"
end
end
# @api private
def override(bindings, description = "", &block)
push(bindings, description)
yield
ensure
pop
end
end
Version data entries
10 entries across 10 versions & 1 rubygems