debian-mirror-gitlab/lib/gitlab/discussions_diff/file_collection.rb
2019-02-15 15:39:39 +05:30

76 lines
2.1 KiB
Ruby

# frozen_string_literal: true
module Gitlab
module DiscussionsDiff
class FileCollection
include Gitlab::Utils::StrongMemoize
def initialize(collection)
@collection = collection
end
# Returns a Gitlab::Diff::File with the given ID (`unique_identifier` in
# Gitlab::Diff::File).
def find_by_id(id)
diff_files_indexed_by_id[id]
end
# Writes cache and preloads highlighted diff lines for
# object IDs, in @collection.
#
# highlightable_ids - Diff file `Array` responding to ID. The ID will be used
# to generate the cache key.
#
# - Highlight cache is written just for uncached diff files
# - The cache content is not updated (there's no need to do so)
def load_highlight(highlightable_ids)
preload_highlighted_lines(highlightable_ids)
end
private
def preload_highlighted_lines(ids)
cached_content = read_cache(ids)
uncached_ids = ids.select.each_with_index { |_, i| cached_content[i].nil? }
mapping = highlighted_lines_by_ids(uncached_ids)
HighlightCache.write_multiple(mapping)
diffs = diff_files_indexed_by_id.values_at(*ids)
diffs.zip(cached_content).each do |diff, cached_lines|
next unless diff && cached_lines
diff.highlighted_diff_lines = cached_lines
end
end
def read_cache(ids)
HighlightCache.read_multiple(ids)
end
def diff_files_indexed_by_id
strong_memoize(:diff_files_indexed_by_id) do
diff_files.index_by(&:unique_identifier)
end
end
def diff_files
strong_memoize(:diff_files) do
@collection.map(&:raw_diff_file)
end
end
# Processes the diff lines highlighting for diff files matching the given
# IDs.
#
# Returns a Hash with { id => [Array of Gitlab::Diff::line], ...]
def highlighted_lines_by_ids(ids)
diff_files_indexed_by_id.slice(*ids).each_with_object({}) do |(id, file), hash|
hash[id] = file.highlighted_diff_lines.map(&:to_hash)
end
end
end
end
end