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

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