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# frozen_string_literal: true
require 'sprockets/base'
module Sprockets
# `CachedEnvironment` is a special cached version of `Environment`.
#
# The exception is that all of its file system methods are cached
# for the instances lifetime. This makes `CachedEnvironment` much faster. This
# behavior is ideal in production environments where the file system
# is immutable.
#
# `CachedEnvironment` should not be initialized directly. Instead use
# `Environment#cached`.
class CachedEnvironment < Base
def initialize(environment)
initialize_configuration(environment)
@cache = environment.cache
@stats = Concurrent::Map.new
@entries = Concurrent::Map.new
@uris = Concurrent::Map.new
@processor_cache_keys = Concurrent::Map.new
@resolved_dependencies = Concurrent::Map.new
end
# No-op return self as cached environment.
def cached
self
end
alias_method :index, :cached
# Internal: Cache Environment#entries
def entries(path)
@entries.fetch_or_store(path) { super(path) }
end
# Internal: Cache Environment#stat
def stat(path)
@stats.fetch_or_store(path) { super(path) }
end
# Internal: Cache Environment#load
def load(uri)
@uris.fetch_or_store(uri) { super(uri) }
end
# Internal: Cache Environment#processor_cache_key
def processor_cache_key(str)
@processor_cache_keys.fetch_or_store(str) { super(str) }
end
# Internal: Cache Environment#resolve_dependency
def resolve_dependency(str)
@resolved_dependencies.fetch_or_store(str) { super(str) }
end
private
# Cache is immutable, any methods that try to change the runtime config
# should bomb.
def config=(config)
raise RuntimeError, "can't modify immutable cached environment"
end
end
end
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