class Sprockets::CachedEnvironment

‘Environment#cached`.
`CachedEnvironment` should not be initialized directly. Instead use
is immutable.
behavior is ideal in production environments where the file system
for the instances lifetime. This makes `CachedEnvironment` much faster. This
The expection is that all of its file system methods are cached
`CachedEnvironment` is a special cached version of `Environment`.

def cached

No-op return self as cached environment. 
def cached
  self
end

def config=(config)

should bomb.
Cache is immutable, any methods that try to change the runtime config 
def config=(config)
  raise RuntimeError, "can't modify immutable cached environment"
end

def entries(path)

Internal: Cache Environment#entries 
def entries(path)
  @entries[path] ||= super(path)
end

def initialize(environment) 

def initialize(environment)
  initialize_configuration(environment)
  @cache   = environment.cache
  @stats   = {}
  @entries = {}
  @uris    = {}
  @processor_cache_keys = {}
  @resolved_dependencies = {}
end

def load(uri)

Internal: Cache Environment#load 
def load(uri)
  @uris[uri] ||= super(uri)
end

def processor_cache_key(str)

Internal: Cache Environment#processor_cache_key 
def processor_cache_key(str)
  @processor_cache_keys[str] ||= super(str)
end

def resolve_dependency(str)

Internal: Cache Environment#resolve_dependency 
def resolve_dependency(str)
  @resolved_dependencies[str] ||= super(str)
end

def stat(path)

Internal: Cache Environment#stat 
def stat(path)
  @stats[path] ||= super(path)
end