| 1 | package de.uka.ipd.sdq.pcmsolver.transformations; |
| 2 | |
| 3 | import java.util.HashMap; |
| 4 | |
| 5 | import de.uka.ipd.sdq.pcm.seff.seff_performance.ParametricResourceDemand; |
| 6 | import de.uka.ipd.sdq.probfunction.ProbabilityDensityFunction; |
| 7 | import de.uka.ipd.sdq.probfunction.math.ManagedPDF; |
| 8 | |
| 9 | /** |
| 10 | * Cache for the solved resource demands. Stores both pdfs and constant demands. |
| 11 | * Offers methods to retrieve the actual demand for a ParametricResourceDemand |
| 12 | * as aa double (i.e. mean value or constant) or PDF. |
| 13 | * |
| 14 | * @author martens |
| 15 | * |
| 16 | */ |
| 17 | class ResourceDemandCache { |
| 18 | private HashMap<ParametricResourceDemand, ExpressionToPDFWrapper> resDemandDistributions = new HashMap<ParametricResourceDemand, ExpressionToPDFWrapper>(); |
| 19 | |
| 20 | /** |
| 21 | * Returns the resource demand for the passed |
| 22 | * {@link ParametricResourceDemand} as a {@link Double}. May return null if |
| 23 | * there was no matching resource demand found internally. If the resource |
| 24 | * demand was only given as a pdf before, it also puts the Double in the |
| 25 | * cache for future use. |
| 26 | * |
| 27 | * @param prd |
| 28 | * @return |
| 29 | */ |
| 30 | public Double getDouble(ParametricResourceDemand prd) { |
| 31 | if (this.resDemandDistributions.containsKey(prd)) { |
| 32 | return this.resDemandDistributions.get(prd).getMeanValue(); |
| 33 | } |
| 34 | return null; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Returns the resource demand for the passed |
| 39 | * {@link ParametricResourceDemand} as a {@link ManagedPDF}. May return null |
| 40 | * if there was no matching resource demand found internally. If the |
| 41 | * resource demand was only given as a double before, it also puts the new |
| 42 | * pdf in the cache for future use. |
| 43 | * |
| 44 | * @param prd |
| 45 | * @return |
| 46 | */ |
| 47 | public ManagedPDF getPDF(ParametricResourceDemand prd) { |
| 48 | if (this.resDemandDistributions.containsKey(prd)) { |
| 49 | return new ManagedPDF(resDemandDistributions.get(prd).getPDF()); |
| 50 | } |
| 51 | return null; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns whether this resource demand is a derived pdf (i.e. it has been |
| 56 | * created using a mean value) or whether it is an original pdf (i.e. the |
| 57 | * mean value is derived). |
| 58 | * |
| 59 | * @return true if it has been created using |
| 60 | * {@link #put(ParametricResourceDemand, ProbabilityDensityFunction)} |
| 61 | * , false if this has been created using |
| 62 | * {@link #put(ParametricResourceDemand, Double)}. |
| 63 | */ |
| 64 | public boolean isOriginalPDF(ParametricResourceDemand prd) { |
| 65 | if (this.resDemandDistributions.containsKey(prd)) { |
| 66 | return this.resDemandDistributions.get(prd).isOriginalPDF(); |
| 67 | } else { |
| 68 | return false; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * |
| 74 | * @param parametricResourceDemand |
| 75 | * @param rdWrapper |
| 76 | */ |
| 77 | public void put(ParametricResourceDemand parametricResourceDemand, |
| 78 | ExpressionToPDFWrapper rdWrapper) { |
| 79 | this.resDemandDistributions.put(parametricResourceDemand, rdWrapper); |
| 80 | |
| 81 | } |
| 82 | } |