Sha256: 6eaeaf3a17bfde1dec3838329117eaf61832a06470bac46d5210a4ea43573340
Contents?: true
Size: 816 Bytes
Versions: 9
Compression:
Stored size: 816 Bytes
Contents
require "yaml"
module Nutrella
#
# Provides a cache of the most recently used items.
#
class Cache
attr_reader :capacity, :path
def initialize(path, capacity)
@path = path
@capacity = capacity
end
def fetch(key)
value = lookup(key) || yield
write(key, value)
value
end
private
def lookup(key)
cache_contents.find { |k, _v| k == key }.last
rescue
nil
end
def write(key, value)
File.write(path, cached_entries(key, value).to_yaml)
end
def cached_entries(key, value)
entries = cache_contents.reject { |k, _v| k == key }
[[key, value]].concat(entries).take(capacity)
rescue
[[key, value]]
end
def cache_contents
@cache_contents ||= YAML.load_file(path)
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems