Use LruRedux::Cache instead of RDF::Utils::Cache.

Author: gkellogg

json-ld.gemspec

@@ -28,6 +28,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency     'rdf',             '~> 3.1'
   gem.add_runtime_dependency     'multi_json',      '~> 1.14'
   gem.add_runtime_dependency     'link_header',     '~> 0.0', '>= 0.0.8'
+  gem.add_runtime_dependency     'lru_redux',       '~> 1.1'
   gem.add_runtime_dependency     'json-canonicalization', '~> 0.2'
   gem.add_runtime_dependency     'htmlentities',     '~> 4.3'
   gem.add_runtime_dependency     'rack',            '~> 2.0'

lib/json/ld/context.rb

@@ -3,7 +3,7 @@
 require 'json'
 require 'bigdecimal'
 require 'set'
-require 'rdf/util/cache'
+require 'lru_redux'
 begin
   # Attempt to load this to avoid unnecessary context fetches
   require 'json-ld-preloaded'
@@ -121,7 +121,7 @@ def self.parse(local_context, override_protected: false, propagate: true, **opti
     # @return [RDF::Util::Cache]
     # @private
     def self.cache
-      @cache ||= RDF::Util::Cache.new(CACHE_SIZE)
+      @cache ||= LruRedux::Cache.new(CACHE_SIZE)
     end
 
     ##
@@ -130,7 +130,7 @@ def self.cache
     # @return [RDF::Util::Cache]
     # @private
     def self.inverse_cache
-      @inverse_cache ||= RDF::Util::Cache.new(CACHE_SIZE)
+      @inverse_cache ||= LruRedux::Cache.new(CACHE_SIZE)
     end
 
     ##