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module Moneta
# Combines multiple stores. Reads return the result from the first store,
# writes go to all stores.
#
# @example Add `Moneta::Stack` to proxy stack
# Moneta.build do
# use(:Stack) do
# add { adapter :Redis }
# add { adapter :File, dir: 'data' }
# add { adapter :File, dir: 'replicate' }
# end
# end
#
# @api public
class Stack
include Defaults
# @api private
class DSL
def initialize(stack, &block)
@stack = stack
instance_eval(&block)
end
# @api public
def add(store = nil, &block)
raise ArgumentError, 'Only argument or block allowed' if store && block
@stack << (store || Moneta.build(&block))
nil
end
end
attr_reader :stack
# @param [Hash] options Options hash
# @option options [Array] :stack Array of Moneta stores
# @yieldparam Builder block
def initialize(options = {}, &block)
@stack = options[:stack].to_a
DSL.new(@stack, &block) if block_given?
end
# (see Proxy#key?)
def key?(key, options = {})
@stack.any? { |s| s.key?(key, options) }
end
# (see Proxy#load)
def load(key, options = {})
@stack.each do |s|
value = s.load(key, options)
return value if value != nil
end
nil
end
# (see Proxy#store)
def store(key, value, options = {})
@stack.each { |s| s.store(key, value, options) }
value
end
# (see Proxy#increment)
def increment(key, amount = 1, options = {})
last = nil
@stack.each { |s| last = s.increment(key, amount, options) }
last
end
# (see Proxy#create)
def create(key, value, options = {})
last = false
@stack.each { |s| last = s.create(key, value, options) }
last
end
# (see Proxy#delete)
def delete(key, options = {})
@stack.inject(nil) do |value, s|
v = s.delete(key, options)
value || v
end
end
# (see Proxy#clear)
def clear(options = {})
@stack.each { |s| s.clear(options) }
self
end
# (see Proxy#close)
def close
@stack.each { |s| s.close }
nil
end
# (see Proxy#features)
def features
@features ||=
begin
features = @stack.map(&:features)
(features.inject(features.first, &:&) - [:each_key]).freeze
end
end
end
end
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