module Chef::Node::Mixin::DeepMergeCache

Attributes

deep_merge_cache[RW]

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.

Public Class Methods

new() click to toggle source
# File lib/chef/node/mixin/deep_merge_cache.rb, line 29
def initialize
  @merged_attributes = nil
  @combined_override = nil
  @combined_default = nil
  @deep_merge_cache = {}
end

Public Instance Methods

[](key) click to toggle source
# File lib/chef/node/mixin/deep_merge_cache.rb, line 50
def [](key)
  ret = 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
  ret = ret.call while ret.is_a?(::Chef::DelayedEvaluator)
  ret
end
reset(path = nil)
Alias for: reset_cache
reset_cache(path = nil) click to toggle source

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['bar’]= 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.

# File lib/chef/node/mixin/deep_merge_cache.rb, line 40
def reset_cache(path = nil)
  if path.nil?
    deep_merge_cache.clear
  else
    deep_merge_cache.delete(path.to_s)
  end
end
Also aliased as: reset