RGen::Fragment::DumpFileCache

Caches model fragments in Ruby dump files.

Dump files are created per each fragment file.

The main goal is to support fast loading and joining of fragments. Therefore the cache stores additional information which makes the joining process faster (adding to environment, resolving references)

Public Class Methods

new(cache_map) click to toggle source

cache_map must be an object responding to load_data and store_data for loading or storing data associated with a file; this can be an instance of Util::FileCacheMap

# File lib/rgen/fragment/dump_file_cache.rb, line 18
def initialize(cache_map)
  @cache_map = cache_map 
end

Public Instance Methods

load(fragment) click to toggle source

# File lib/rgen/fragment/dump_file_cache.rb, line 40
def load(fragment)
  dump = @cache_map.load_data(fragment.location)
  return :invalid if dump == :invalid
  header = Marshal.load(dump)
  fragment.set_root_elements(header[:root_elements],
    :elements => header[:elements],
    :index => header[:index],
    :unresolved_refs => header[:unresolved_refs])
  fragment.data = header[:data]
  if header[:fragment_ref]
    fragment.fragment_ref = header[:fragment_ref]
    fragment.fragment_ref.fragment = fragment
  else
    raise "no fragment_ref in fragment loaded from cache"
  end
end

store(fragment) click to toggle source

Note that the fragment must not be connected to other fragments by resolved references unresolve the fragment if necessary

# File lib/rgen/fragment/dump_file_cache.rb, line 24
def store(fragment)
  fref = fragment.fragment_ref
  # temporarily remove the reference to the fragment to avoid dumping the fragment
  fref.fragment = nil
  @cache_map.store_data(fragment.location,
    Marshal.dump({
      :root_elements => fragment.root_elements,
      :elements => fragment.elements,
      :index => fragment.index,
      :unresolved_refs => fragment.unresolved_refs,
      :fragment_ref => fref,
      :data => fragment.data
    }))
  fref.fragment = fragment
end

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RGen::Fragment::DumpFileCache

Public Class Methods

Public Instance Methods