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require 'digest'
require 'digest/sha2'
module DataObjects
class Transaction
# The host name. Note, this relies on the host name being configured and resolvable using DNS
HOST = "#{Socket::gethostbyname(Socket::gethostname)[0]}" rescue "localhost"
@@counter = 0
# The connection object allocated for this transaction
attr_reader :connection
# A unique ID for this transaction
attr_reader :id
# Instantiate the Transaction subclass that's appropriate for this uri scheme
def self.create_for_uri(uri)
uri = uri.is_a?(String) ? URI::parse(uri) : uri
DataObjects.const_get(uri.scheme.capitalize)::Transaction.new(uri)
end
#
# Creates a Transaction bound to a connection for the given DataObjects::URI
#
def initialize(uri)
@connection = DataObjects::Connection.new(uri)
@id = Digest::SHA256.hexdigest("#{HOST}:#{$$}:#{Time.now.to_f}:#{@@counter += 1}")
end
# Close the connection for this Transaction
def close
@connection.close
end
def begin
cmd = "BEGIN"
connection.create_command(cmd).execute_non_query
end
def commit
cmd = "COMMIT"
connection.create_command(cmd).execute_non_query
end
def rollback
cmd = "ROLLBACK"
connection.create_command(cmd).execute_non_query
end
def prepare; not_implemented; end;
def begin_prepared; not_implemented; end;
def commit_prepared; not_implemented; end;
def rollback_prepared; not_implemented; end;
def prepare; not_implemented; end;
private
def not_implemented
raise NotImplementedError
end
end
end
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