• dalli
• connection_pool
• delegate
• active_support/core_ext/enumerable
• active_support/core_ext/array/extract_options
• active_support/core_ext/numeric/time

• 模块 ActiveSupport
• 模块 ActiveSupport::Cache
• 模块 ActiveSupport::Cache::Strategy
• 类 ActiveSupport::Cache::MemCacheStore