Caches that implement LocalCache will be backed by an in memory cache for the duration of a block. Repeated calls to the cache for the same key will hit the in memory cache for faster access.

Namespace
Methods
M
W
Instance Public methods
middleware()

Middleware class can be inserted as a Rack handler to be local cache for the duration of request.

Source: show 

# File activesupport/lib/active_support/cache/strategy/local_cache.rb, line 80
def middleware
  @middleware ||= Middleware.new(
    "ActiveSupport::Cache::Strategy::LocalCache",
    thread_local_key)
end
with_local_cache()

Use a local cache for the duration of block.

Source: show 

# File activesupport/lib/active_support/cache/strategy/local_cache.rb, line 43
def with_local_cache
  save_val = Thread.current[thread_local_key]
  begin
    Thread.current[thread_local_key] = LocalStore.new
    yield
  ensure
    Thread.current[thread_local_key] = save_val
  end
end