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Contents
module RunLoop
# @!visibility private
# A class for managing an on-disk cache.
class Cache
require 'fileutils'
def initialize(path)
@path = path
end
def clear
raise NotImplementedError, 'Subclasses must implement #clear'
end
def refresh
raise NotImplementedError, 'Subclasses must implement #refresh'
end
# Reads the current cache.
# @return [Hash] A hash representation of the cache on disk.
def read
if File.exist? path
File.open(path) do |file|
Marshal.load(file)
end
else
write({})
end
end
private
attr_reader :path
# @!visibility private
#
# Writes `hash` as a serial object. The existing data is overwritten.
#
# @param [Hash] hash The hash to write.
# @raise [ArgumentError] The `hash` parameter must not be nil and it must
# be a Hash.
# @raise [TypeError] If the hash contains objects that cannot be written
# by Marshal.dump.
#
# @return [Hash] Returns the `hash` argument.
def write(hash)
if hash.nil?
raise ArgumentError, 'Expected the hash parameter to be non-nil'
end
unless hash.is_a?(Hash)
raise ArgumentError, "Expected #{hash} to a Hash, but it is a #{hash.class}"
end
directory = File.dirname(path)
unless File.exist?(directory)
FileUtils.mkdir_p(directory)
end
File.open(path, 'w') do |file|
Marshal.dump(hash, file)
end
hash
end
end
end
Version data entries
35 entries across 35 versions & 2 rubygems