Class: Kennel::FileCache

Inherits:
Object
  • Object
show all
Defined in:
lib/kennel/file_cache.rb

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ FileCache

Returns a new instance of FileCache.



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# File 'lib/kennel/file_cache.rb', line 8

def initialize(file)
  @file = file
  @data =
    begin
      Marshal.load(File.read(@file)) # rubocop:disable Security/MarshalLoad
    rescue StandardError
      {}
    end
  @now = Time.now.to_i
  @expires = @now + (30 * 24 * 60 * 60) # 1 month
  @data.reject! { |_, (_, _, ex)| ex < @now } # expire old data
end

Instance Method Details

#fetch(key, version) ⇒ Object 



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# File 'lib/kennel/file_cache.rb', line 21

def fetch(key, version)
  old_value, old_version = @data[key]
  return old_value if old_version == version

  new_value = yield
  @data[key] = [new_value, version, @expires]
  new_value
end

#persist ⇒ Object 



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# File 'lib/kennel/file_cache.rb', line 30

def persist
  FileUtils.mkdir_p(File.dirname(@file))
  File.write(@file, Marshal.dump(@data))
end