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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
module Core
# @api private
module Cacheable
# @api private
class NoData < StandardError; end
def self.included base
base.extend Naming unless base.respond_to?(:service_ruby_name)
end
# @api private
protected
def local_cache_key
raise NotImplementedError
end
# @api private
protected
def cache_key
@cache_key ||= begin
config.credential_provider.access_key_id + ":" +
config.region + ":" +
self.class.name + ":" +
local_cache_key
end
end
# @api private
public
def retrieve_attribute attr, &block
if cache = AWS.response_cache
if cache.resource_cache.cached?(cache_key, attr.name)
return cache.resource_cache.get(cache_key, attr.name)
end
cache.select(*attr.request_types).each do |response|
if attributes = attributes_from_response(response)
cache.resource_cache.store(cache_key, attributes)
return attributes[attr.name] if attributes.key?(attr.name)
end
end
end
response = yield
if attributes = attributes_from_response(response)
if cache = AWS.response_cache
cache.resource_cache.store(cache_key, attributes)
end
attributes[attr.name] if attributes.key?(attr.name)
else
raise NoData.new("no data in #{response.request_type} response")
end
end
end
end
end
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