Design Problem Solving

5.8 Failure Handler Example

(FAILURE-HANDLER

(NAME SystemStepBodyFailureFH )

(TYPE System)

(USED-BY-TYPE Step)

(BODY

(TABLE

(DEPENDING-ON MESSAGE)

(MATCH

(IF ( "Programming problem" )

THEN (FAIL) )

(IF ( "Pre-decision constraint failure" )

THEN (USE-FH SystemPreDecisionConstraintFH

WITH CONTRIBUTING-MSG) )

(IF ( "Failure while getting known values" )

THEN (USE-FH SystemGettingKnownsFH

WITH CONTRIBUTING-MSG) )

(IF ( "Decision failure" )

THEN (USE-FH SystemDecisionFH

WITH CONTRIBUTING-MSG) )

)

(OTHERWISE

(DO (COMPLAIN "Message not recognized" )

(FAIL)

))

) ))

Figure 26: Failure Handler "SystemStepBodyFailureFH"

A Failure Handler (FH) can be o ...