| 摘要 |
A process for modeling at least a portion of a workflow includes accessing a computer data structure to represent an acyclic directed graph ( 10 ) including multiple nodes ( 12 ) and one or more edges ( 14 ), each edge ( 14 ) linking two adjacent nodes ( 12 ). The value of a function at a selected node ( 12 ) is requested, the value of the function at the selected node ( 12 ) depending on values of the function at one or more adjacent nodes ( 12 ) lying in a first direction from the selected node ( 12 ). If a cached value of the function at the selected node ( 12 ) is not assured to be valid, then the value of the function at the selected node ( 12 ) is recomputed based on the values of the function at the one or more adjacent nodes ( 12 ) and then returned. If the cached value is assured to be valid, then the cached value is returned without recomputing the value of the function at the selected node ( 12 ).
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