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module Scrivito
# This module provides advances auto-invalidating caching mechanism for storing obj data.
#
# To keep it up-to-date its caches and changes should be updated periodically
# Its changes should be updated every time a new workspace data has been fetched.
# Its caches should be updated every time a new obj data has been fetched.
module ContentStateCaching
class << self
# How deep should a content state chain be inspected. Default depth is 20.
attr_accessor :cache_lookup_depth
# At which lookup depth to copy a hit found in an ancestor content state
# to the current content state's cache. Default depth is 5.
attr_accessor :cache_replication_depth
# Updates caches with data from given workspace.
# Should be called every time a new OBJ data has been fetched.
def store_obj_data(content_state, index, key, data)
content_state.save_obj_data(index, key, data) if content_state
end
# Fetches up-to-date obj data for given workspace, index and key.
# Returns nil if no up-to-date data found.
def find_obj_data(current_content_state , index, key)
if index == 'permalink'
current_content_state.find_obj_data(index, key)
else
visitor = ContentStateVisitor.new(current_content_state)
cache_lookup_depth.times do |depth|
return unless content_state = visitor.visit_next
if hit = content_state.find_obj_data(index, key)
visitor.visited_except_current.each { |cs| return if cs.has_changes_for?(index, key, hit) }
current_content_state.save_obj_data(index, key, hit) if depth >= cache_replication_depth
return hit
end
end
nil
end
end
end
self.cache_replication_depth = 5
self.cache_lookup_depth = 20
end
end
Version data entries
27 entries across 27 versions & 1 rubygems