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require "infopark_component_cache/guards/cms_state_guard"
module InfoparkComponentCache
module Guards
# @author Tomasz Przedmojski <tomasz.przedmojski@infopark.de>
#
# This Guard class ensures that the total count of Objs in the database
# does not change inbetween. (It caches the number of Objs and compares
# it to the current count)
class ObjCount < CmsStateGuard
def consistent?
count_known? && no_changes_since?
end
def guard!
cache.write(cache_key, current_count)
end
# @return true if obj count can be read from cache with {#cache_key}
def count_known?
cache.exist?(cache_key) && cache.read(cache_key).kind_of?(Integer)
end
# @return true if no obj has been deleted or added since last {#guard!}
def no_changes_since?
current_count == cache.read(cache_key)
end
# @return [String] the cache key for storing {#current_count}
def cache_key
component.cache_key("obj_count")
end
# @return [Integer] the number of Objs in the database
def current_count
scoped_relation.count
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems