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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Christopher Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2008, 2009 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'chef/resource_collection/resource_set'
require 'chef/resource_collection/resource_list'
require 'chef/resource_collection/resource_collection_serialization'
##
# ResourceCollection currently handles two tasks:
# 1) Keeps an ordered list of resources to use when converging the node
# 2) Keeps a unique list of resources (keyed as `type[name]`) used for notifications
class Chef
class ResourceCollection
include ResourceCollectionSerialization
def initialize
@resource_set = ResourceSet.new
@resource_list = ResourceList.new
end
# @param resource [Chef::Resource] The resource to insert
# @param resource_type [String,Symbol] If known, the resource type used in the recipe, Eg `package`, `execute`
# @param instance_name [String] If known, the recource name as used in the recipe, IE `vim` in `package 'vim'`
# @param at_location [Integer] If know, a location in the @resource_list to insert resource
# If you know the at_location but not the resource_type or instance_name, pass them in as nil
# This method is meant to be the 1 insert method necessary in the future. It should support all known use cases
# for writing into the ResourceCollection.
def insert(resource, resource_type=nil, instance_name=nil, at_location=nil)
if at_location
@resource_list.insert_at(at_location, resource)
else
@resource_list.insert(resource)
end
unless resource_type.nil? || instance_name.nil?
@resource_set.insert_as(resource, resource_type, instance_name)
else
@resource_set.insert_as(resource)
end
end
# @param insert_at_index [Integer] Location to insert resources
# @param resources [Chef::Resource] Resources to insert
# @depreciated Callers should use the insert method above and loop through their resources as necessary
def insert_at(insert_at_index, *resources)
@resource_list.insert_at(insert_at_index, *resources)
resources.each do |resource|
@resource_set.insert_as(resource)
end
end
# @depreciated
def []=(index, resource)
@resource_list[index] = resource
@resource_set.insert_as(resource)
end
# @depreciated
def <<(*resources)
resources.flatten.each do |res|
insert(res)
end
self
end
# @depreciated
alias_method :push, :<<
# TODO when there were 2 resources with the same key in resource_set, how do we handle notifications since they get copied?
# Did the old class only keep the last seen reference?
# TODO do we need to implement a dup method? Run_context was shallowly copying resource_collection before
# Read-only methods are simple to proxy - doing that below
RESOURCE_LIST_METHODS = Enumerable.instance_methods +
[:iterator, :all_resources, :[], :each, :execute_each_resource, :each_index, :empty?] -
[:find] # find needs to run on the set
RESOURCE_SET_METHODS = [:lookup, :find, :resources, :keys, :validate_lookup_spec!]
def method_missing(name, *args, &block)
if RESOURCE_LIST_METHODS.include?(name)
proxy = @resource_list
elsif RESOURCE_SET_METHODS.include?(name)
proxy = @resource_set
else
raise NoMethodError.new("ResourceCollection does not proxy `#{name}`", name, args)
end
if block
proxy.send(name, *args, &block)
else
proxy.send(name, *args)
end
end
end
end
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