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# frozen_string_literal: true
require 'gh'
module GH
# Public: This class caches responses.
class Cache < Wrapper
# Public: Get/set cache to use. Compatible with Rails/ActiveSupport cache.
attr_accessor :cache
# Internal: Simple in-memory cache basically implementing a copying GC.
class SimpleCache
# Internal: Initializes a new SimpleCache.
#
# size - Number of objects to hold in cache.
def initialize(size = 2048)
@old = {}
@new = {}
@size = size / 2
@mutex = Mutex.new
end
# Internal: Tries to fetch a value from the cache and if it doesn't exist, generates it from the
# block given.
def fetch(key)
if @new.size > @size
@mutex.synchronize do
if @new.size > @size
@old = @new
@new = {}
end
end
end
@new[key] ||= @old[key] || yield
end
# Internal: ...
def clear
@mutex.synchronize do
@old = {}
@new = {}
end
end
end
# Internal: Initializes a new Cache instance.
def setup(*)
# self.cache ||= Rails.cache if defined? Rails.cache and defined? RAILS_CACHE
# self.cache ||= ActiveSupport::Cache.lookup_store if defined? ActiveSupport::Cache.lookup_store
self.cache ||= SimpleCache.new
super
end
# Public: ...
def reset
super
clear_partial or clear_all
end
private
def fetch_resource(key)
cache.fetch(prefixed(key)) { super }
end
def clear_partial
return false unless cache.respond_to? :delete_matched
pattern = '^' << Regexp.escape(prefixed(''))
cache.delete_matched Regexp.new(pattern)
true
rescue NotImplementedError
false
end
def clear_all
cache.clear
end
end
end
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