| 1 | package de.uka.ipd.sdq.simucomframework.variables.cache; |
| 2 | |
| 3 | import java.util.HashMap; |
| 4 | |
| 5 | import de.uka.ipd.sdq.probfunction.math.IProbabilityFunctionFactory; |
| 6 | import de.uka.ipd.sdq.probfunction.math.IRandomGenerator; |
| 7 | |
| 8 | /** |
| 9 | * A cache for Stoex. This saves the time to parse the stoex again. |
| 10 | * Caches also the {@link IRandomGenerator} which may contain a fixed seed. |
| 11 | * |
| 12 | * @author Steffen Becker |
| 13 | * |
| 14 | */ |
| 15 | public class StoExCache { |
| 16 | |
| 17 | /** |
| 18 | * Hashmap mapping stoex strings on StoEx AST incl. Type Inferer and ProbfunctionCache |
| 19 | */ |
| 20 | private final HashMap<String,StoExCacheEntry> cache = new HashMap<String,StoExCacheEntry>(); |
| 21 | |
| 22 | // TODO: This is no real singleton anymore, as each simulation can have its own seed. |
| 23 | // Franz' version of adding the random number generator to the cache does not work in |
| 24 | // concurrent runs as well as in Protocom |
| 25 | private static StoExCache stoexSingleton = null; |
| 26 | private IProbabilityFunctionFactory probFunctionFactory = null; |
| 27 | |
| 28 | |
| 29 | |
| 30 | /** |
| 31 | * Only protected because the cost model should have its own instance of the StoExCache |
| 32 | * so that it can be resetted independently of the main singleton instance. |
| 33 | * @param randomGenerator |
| 34 | */ |
| 35 | protected StoExCache(IProbabilityFunctionFactory probFunctionFactory) { |
| 36 | this.probFunctionFactory = probFunctionFactory; |
| 37 | } |
| 38 | |
| 39 | public static void initialiseStoExCache(IProbabilityFunctionFactory probFunctionFactory){ |
| 40 | assert probFunctionFactory != null; |
| 41 | stoexSingleton = new StoExCache(probFunctionFactory); |
| 42 | } |
| 43 | |
| 44 | public static StoExCache singleton() { |
| 45 | assert stoexSingleton != null; |
| 46 | return stoexSingleton; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Get a cached stoex parse tree and visitors. If entry is not in the cache it |
| 51 | * is created and added automatically. |
| 52 | * @param spec The stoex to search for in the cache |
| 53 | * @return The StoExCacheEntry containing the static information on the stoex |
| 54 | */ |
| 55 | public synchronized StoExCacheEntry getEntry(String spec) { |
| 56 | assert probFunctionFactory.getRandomGenerator() != null; |
| 57 | if (!cache.containsKey(spec)){ |
| 58 | cache.put(spec, new StoExCacheEntry(spec)); |
| 59 | } |
| 60 | return cache.get(spec); |
| 61 | } |
| 62 | |
| 63 | public IRandomGenerator getRandomGenerator(){ |
| 64 | return this.probFunctionFactory.getRandomGenerator(); |
| 65 | } |
| 66 | |
| 67 | public IProbabilityFunctionFactory getProbabilityFunctionFactory(){ |
| 68 | return this.probFunctionFactory; |
| 69 | } |
| 70 | } |