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Contents
module Internals
module Index
class Redis
# Redis Backend Accessor.
#
# Provides necessary helper methods for its
# subclasses.
# Not directly useable, as it does not provide
# dump/load methods.
#
class Basic
attr_reader :namespace, :backend
# An index cache takes a path, without file extension,
# which will be provided by the subclasses.
#
def initialize namespace
@namespace = namespace
# TODO Turn this inside out such that people can pass in
# their own Redis instance.
#
# TODO Make the :db a real option.
#
@backend = ::Redis.new :db => 15
end
# Does nothing.
#
def load
# Nothing.
end
# We do not use Redis to retrieve data.
#
def retrieve
# Nothing.
end
# Redis does not backup.
#
def backup
# Nothing.
end
# Deletes the Redis index namespace.
#
def delete
# Not implemented here.
# Note: backend.flushdb might be the way to go,
# but since we cannot delete by key pattern,
# we don't do anything.
end
# Checks.
#
# Is this cache suspiciously small?
#
def cache_small?
size < 1
end
# Is the cache ok?
#
# A small cache is still ok.
#
def cache_ok?
size > 0
end
# Extracts the size of the file in Bytes.
#
# Note: This is a very forgiving implementation.
# But as long as Redis does not implement
# DBSIZE KEYPATTERN, we are stuck with this.
#
def size
backend.dbsize
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems