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module Picky
module Backends
class File
# Base class for all file-based index files.
#
# Provides necessary helper methods for its
# subclasses.
# Not directly useable, as it does not provide
# dump/load methods.
#
class Basic
include Helpers::File
attr_reader :cache_path, # This index file's location.
:mapping_file # The index file's mapping file (loaded into memory for quick access).
# An index cache takes a path, without file extension,
# which will be provided by the subclasses.
#
def initialize cache_path, options = {}
@cache_path = "#{cache_path}.file.#{extension}"
# This is the mapping file with the in-memory hash for the
# file position/offset mappings.
#
@mapping_file = Memory::JSON.new "#{cache_path}.file_mapping.#{extension}"
@empty = options[:empty]
@initial = options[:initial]
end
# The default extension for index files is "index".
#
def extension
:index
end
# The empty index that is used for putting the index
# together before it is saved into the files.
#
def empty
@empty && @empty.clone || {}
end
# The initial content before loading.
#
# Note: We could also load the mapping file
# as in #load.
#
def initial
@initial && @initial.clone || {}
end
# Deletes the file.
#
def delete
mapping_file.delete
`rm -Rf #{cache_path}`
end
#
#
def to_s
"#{self.class}(#{cache_path},#{mapping_file.cache_path})"
end
end
end
end
end
Version data entries
66 entries across 66 versions & 1 rubygems