Optimal Decomposition of Service Level Objectives into Policy Assertions

Table 1

Performance and cost policies.

	Performance (it is measured by response-time)	Cost (it is measured by dollar)
Clearing service	<Policy Id="clearing-Performance">	<Policy Id="clearing-Cost">
	<PerformanceToken usage="mandatory">	<CostToken usage="mandatory">
	<TokenType>responseTime</TokenType>	<TokenType>dollar</TokenType>
	<TokenValue>20</TokenValue>	<TokenValue>5</TokenValue>
	</PerformanceToken>	</CostToken>
	</Policy>	</Policy>
Settlement service	<Policy Id="settlement-Performance">	<Policy Id="settlement-Cost">
	<PerformanceToken usage="mandatory">	<CostToken usage="mandatory">
	<TokenType>responseTime</TokenType>	<TokenType>dollar</TokenType>
	<TokenValue>10</TokenValue>	<TokenValue>15</TokenValue>
	</PerformanceToken>	</CostToken>
	</Policy>	</Policy>