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add exceptions and storage base abstraction
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module Anemone | ||
class Error < ::StandardError | ||
attr_accessor :wrapped_exception | ||
end | ||
end |
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require 'anemone/storage/exceptions' | ||
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module Anemone | ||
module Storage | ||
class Base | ||
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def initialize(adapter) | ||
@adap = adapter | ||
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# verify adapter conforms to this class's methods | ||
methods.each do |method| | ||
if !@adap.respond_to?(method.to_sym) | ||
raise "Storage adapter must support method #{method}" | ||
end | ||
end | ||
end | ||
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def [](key) | ||
@adap[key] | ||
rescue | ||
raise RetrievalError | ||
end | ||
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def []=(key, value) | ||
@adap[key] = value | ||
rescue | ||
raise InsertionError | ||
end | ||
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def delete(key) | ||
@adap.delete(key) | ||
rescue | ||
raise DeletionError | ||
end | ||
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def each | ||
@adap.each { |k, v| yield k, v } | ||
rescue | ||
raise GenericError | ||
end | ||
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def merge!(hash) | ||
@adap.merge!(hash) | ||
rescue | ||
raise GenericError | ||
end | ||
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def close | ||
@adap.close | ||
rescue | ||
raise CloseError | ||
end | ||
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def size | ||
@adap.size | ||
rescue | ||
raise GenericError | ||
end | ||
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def keys | ||
@adap.keys | ||
rescue | ||
raise GenericError | ||
end | ||
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def has_key?(key) | ||
@adap.has_key?(key) | ||
rescue | ||
raise GenericError | ||
end | ||
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end | ||
end | ||
end |
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module Anemone | ||
module Storage | ||
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class GenericError < Error; end; | ||
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class ConnectionError < Error; end | ||
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class RetrievalError < Error; end | ||
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class InsertionError < Error; end | ||
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class CloseError < Error; end | ||
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end | ||
end |
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@@ -43,6 +43,8 @@ def merge!(hash) | |
self | ||
end | ||
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def close; end | ||
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end | ||
end | ||
end |