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module Ftpd
# This module tranlates exceptions to FileSystemError exceptions.
#
# A disk file system (such as Ftpd::DiskFileSystem) is expected to
# raise only FileSystemError exceptions, but many common operations
# result in other exceptions such as SystemCallError. This module
# aids a disk driver in translating exceptions to FileSystemError
# exceptions.
#
# In your file system, driver, include this module:
#
# module MyDiskDriver
# include Ftpd::TranslateExceptions
#
# in your constructor, register the exceptions that should be translated:
#
# def initialize
# translate_exception SystemCallError
# end
#
# And register methods for translation:
#
# def read(ftp_path)
# ...
# end
# translate_exceptions :read
module TranslateExceptions
include Memoizer
def self.included(includer)
includer.extend ClassMethods
end
module ClassMethods
# Cause the named method to translate exceptions.
def translate_exceptions(method_name)
original_method = instance_method(method_name)
define_method method_name do |*args|
exception_translator.translate_exceptions do
original_method.bind(self).call *args
end
end
end
end
# Add exception class e to the list of exceptions to be
# translated.
def translate_exception(e)
exception_translator.register_exception e
end
private
def exception_translator
ExceptionTranslator.new
end
memoize :exception_translator
end
end
Version data entries
20 entries across 20 versions & 1 rubygems