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#--
# Copyright:: Copyright 2016, Chef Software, 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.
#
class Chef
class Node
module Mixin
module DeepMergeCache
# Cache of deep merged values by top-level key. This is a simple hash which has keys that are the
# top-level keys of the node object, and we save the computed deep-merge for that key here. There is
# no cache of subtrees.
attr_accessor :deep_merge_cache
def initialize
@merged_attributes = nil
@combined_override = nil
@combined_default = nil
@deep_merge_cache = {}
end
# Invalidate a key in the deep_merge_cache. If called with nil, or no arg, this will invalidate
# the entire deep_merge cache. In the case of the user doing node.default['foo']['bar']['baz']=
# that eventually results in a call to reset_cache('foo') here. A node.default=hash_thing call
# must invalidate the entire cache and re-deep-merge the entire node object.
def reset_cache(path = nil)
if path.nil?
deep_merge_cache.clear
else
deep_merge_cache.delete(path.to_s)
end
end
alias :reset :reset_cache
def [](key)
if deep_merge_cache.key?(key.to_s)
# return the cache of the deep merged values by top-level key
deep_merge_cache[key.to_s]
else
# save all the work of computing node[key]
deep_merge_cache[key.to_s] = merged_attributes(key)
end
end
end
end
end
end
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