| 1 | package de.uka.ipd.sdq.simucomframework.variables; |
| 2 | |
| 3 | import java.io.Serializable; |
| 4 | |
| 5 | import de.uka.ipd.sdq.simucomframework.variables.stackframe.SimulatedStackframe; |
| 6 | |
| 7 | /** |
| 8 | * Evaluation Proxies are used to store the defining equation instead of the |
| 9 | * actual value in a stackframe entry. This is usefull in cases where the |
| 10 | * equation is stochastic, e.g., contains a random variable like a |
| 11 | * probability function literal. For example, the evaluation proxy |
| 12 | * 10*IntPMF[(1;0.2)(2;0.8) evaluates to 10 in 20% of all cases and to 20 in |
| 13 | * 80% of all cases. |
| 14 | * Evaluation proxies are used to store INNER characterisations which are |
| 15 | * evaluated on every access instead of a single time during their initialisation |
| 16 | * @author Steffen Becker |
| 17 | * |
| 18 | */ |
| 19 | /** |
| 20 | * @author Steffen Becker |
| 21 | * |
| 22 | */ |
| 23 | public class EvaluationProxy implements Serializable { |
| 24 | |
| 25 | /** |
| 26 | * The stoex proxied by this object |
| 27 | */ |
| 28 | private String stoex; |
| 29 | |
| 30 | /** |
| 31 | * The Stackframe under which the stoex is evaluated |
| 32 | */ |
| 33 | private SimulatedStackframe<Object> contextFrame; |
| 34 | |
| 35 | public EvaluationProxy (String stoex, SimulatedStackframe<Object> contextFrame) |
| 36 | { |
| 37 | this.stoex = stoex; |
| 38 | this.contextFrame = contextFrame; |
| 39 | } |
| 40 | |
| 41 | public SimulatedStackframe<Object> getStackFrame() { |
| 42 | return contextFrame; |
| 43 | } |
| 44 | |
| 45 | public String getStoEx() { |
| 46 | return stoex; |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | public String toString() { |
| 51 | return "EvaluationProxy<"+this.getStoEx()+">"; |
| 52 | } |
| 53 | |
| 54 | |
| 55 | } |