bundles/org.simantics.document.server/src/org/simantics/document/server/DocumentHistoryListener.java

   1 package org.simantics.document.server;
   2
   3 import java.util.List;
   4
   5 import org.simantics.db.procedure.Listener;
   6 import org.slf4j.Logger;
   7 import org.slf4j.LoggerFactory;
   8
   9 public class DocumentHistoryListener implements Listener<List<JSONObject>> {
  10     private static final Logger LOGGER = LoggerFactory.getLogger(DocumentHistoryListener.class);
  11
  12         final private DocumentHistory history;
  13
  14     private boolean disposed = false;
  15
  16     DocumentHistoryListener(DocumentHistory history) {
  17         this.history = history;
  18     }
  19
  20     @Override
  21     public void execute(List<JSONObject> result) {
  22
  23         synchronized(history) {
  24
  25                         history.refresh(result);
  26                 if(!history.hasListeners()) {
  27                         history.removeUpdater();
  28                         disposed = true;
  29                 }
  30
  31         }
  32
  33     }
  34
  35     @Override
  36     public void exception(Throwable t) {
  37         LOGGER.warn("DocumentHistoryListener received an exception.", t);
  38     }
  39
  40     @Override
  41     public boolean isDisposed() {
  42         if(!disposed) {
  43                 synchronized(history) {
  44                         if(!history.hasListeners()) {
  45                                 history.removeUpdater();
  46                                 disposed = true;
  47                         }
  48                 }
  49         }
  50         return disposed;
  51     }
  52
  53 }