bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/DependenciesListenerStore.java

   1 package org.simantics.db.layer0.genericrelation;\r
   2 \r
   3 import gnu.trove.set.hash.THashSet;\r
   4 \r
   5 import java.util.HashMap;\r
   6 import java.util.Map;\r
   7 import java.util.Set;\r
   8 \r
   9 import org.simantics.db.Resource;\r
  10 \r
  11 class DependenciesListenerStore {\r
  12         \r
  13         private final Map<Resource,Set<Runnable>> listeners = new HashMap<Resource,Set<Runnable>>();\r
  14 \r
  15         public synchronized void addListener(Resource model, Runnable listener) {\r
  16                 Set<Runnable> list = listeners.get(model);\r
  17                 if(list == null) {\r
  18                         list = new THashSet<Runnable>();\r
  19                         listeners.put(model, list);\r
  20                 }\r
  21                 list.add(listener);\r
  22                 if (DependenciesRelation.DEBUG_LISTENERS) {\r
  23                         System.out.println("DependenciesRelation.addListener(" + listener + "), " + listeners.size() + " total listeners");\r
  24                         new Exception("DependenciesRelation.addListener(" + listener + ")").printStackTrace(System.out);\r
  25                 }\r
  26         }\r
  27 \r
  28         public synchronized void removeListener(Resource model, Runnable listener) {\r
  29                 Set<Runnable> list = listeners.get(model);\r
  30                 if(list == null) return;\r
  31                 list.remove(listener);\r
  32                 if (DependenciesRelation.DEBUG_LISTENERS) {\r
  33                         System.out.println("DependenciesRelation.removeListener(" + listener + "), " + listeners.size() + " total listeners");\r
  34                         new Exception("DependenciesRelation.removeListener(" + listener + ")").printStackTrace(System.out);\r
  35                 }\r
  36         }\r
  37 \r
  38         public synchronized void fireListeners(Resource model) {\r
  39                 Set<Runnable> list = listeners.get(model);\r
  40                 if(list == null) return;\r
  41                 for (Runnable r : list) {\r
  42                         r.run();\r
  43                 }\r
  44         }\r
  45 \r
  46 }