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

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