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module Moneta
# Combines two stores. One is used as cache, the other as backend adapter.
#
# @example Add `Moneta::Cache` to proxy stack
# Moneta.build do
# use(:Cache) do
# adapter { adapter :File, dir: 'data' }
# cache { adapter :Memory }
# end
# end
#
# @api public
class Cache
include Defaults
# @api private
class DSL
def initialize(store, &block)
@store = store
instance_eval(&block)
end
# @api public
def adapter(store = nil, &block)
raise 'Adapter already set' if @store.adapter
raise ArgumentError, 'Only argument or block allowed' if store && block
@store.adapter = store || Moneta.build(&block)
end
# @api public
def cache(store = nil, &block)
raise 'Cache already set' if @store.cache
raise ArgumentError, 'Only argument or block allowed' if store && block
@store.cache = store || Moneta.build(&block)
end
end
attr_accessor :cache, :adapter
# @param [Hash] options Options hash
# @option options [Moneta store] :cache Moneta store used as cache
# @option options [Moneta store] :adapter Moneta store used as adapter
# @yieldparam Builder block
def initialize(options = {}, &block)
@cache, @adapter = options[:cache], options[:adapter]
DSL.new(self, &block) if block_given?
end
# (see Proxy#key?)
def key?(key, options = {})
@cache.key?(key, options) || @adapter.key?(key, options)
end
# (see Proxy#load)
def load(key, options = {})
if options[:sync] || (value = @cache.load(key, options)) == nil
value = @adapter.load(key, options)
@cache.store(key, value, options) if value != nil
end
value
end
# (see Proxy#store)
def store(key, value, options = {})
@cache.store(key, value, options)
@adapter.store(key, value, options)
end
# (see Proxy#increment)
def increment(key, amount = 1, options = {})
@cache.delete(key, options)
@adapter.increment(key, amount, options)
end
# (see Proxy#create)
def create(key, value, options = {})
if @adapter.create(key, value, options)
@cache.store(key, value, options)
true
else
false
end
end
# (see Proxy#delete)
def delete(key, options = {})
@cache.delete(key, options)
@adapter.delete(key, options)
end
# (see Proxy#clear)
def clear(options = {})
@cache.clear(options)
@adapter.clear(options)
self
end
# (see Proxy#close)
def close
@cache.close
@adapter.close
end
# (see Proxy#each_key)
def each_key(&block)
raise NotImplementedError, 'adapter doesn\'t support #each_key' \
unless supports? :each_key
return enum_for(:each_key) unless block_given?
@adapter.each_key(&block)
self
end
# (see Proxy#features)
def features
@features ||= ((@cache.features + [:create, :increment, :each_key]) & @adapter.features).freeze
end
end
end
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