bundles/org.simantics.event/src/org/simantics/event/util/EventUtils.java

   1 package org.simantics.event.util;\r
   2 \r
   3 import java.util.List;\r
   4 import java.util.UUID;\r
   5 \r
   6 import org.simantics.databoard.Bindings;\r
   7 import org.simantics.db.Resource;\r
   8 import org.simantics.db.WriteGraph;\r
   9 import org.simantics.db.common.request.PossibleTypedParent;\r
  10 import org.simantics.db.exception.DatabaseException;\r
  11 import org.simantics.event.ontology.EventResource;\r
  12 import org.simantics.layer0.Layer0;\r
  13 \r
  14 public class EventUtils {\r
  15 \r
  16         public static final int MAX_EVENTS = 1000;\r
  17         public static final int SLICE_SIZE = 64;\r
  18         public static final int KEEPS_SLICES = (MAX_EVENTS / SLICE_SIZE) + 2;\r
  19         public static final String MAX_SLICE_NAME = "" + (SLICE_SIZE-1);\r
  20 \r
  21         public static Resource createLog(WriteGraph graph) throws DatabaseException {\r
  22                 Layer0 L0 = Layer0.getInstance(graph);\r
  23                 EventResource EVENT = EventResource.getInstance(graph);\r
  24         Resource log = graph.newResource();\r
  25         graph.claim(log, L0.InstanceOf, null, EVENT.EventLog);\r
  26         graph.claimLiteral(log, L0.HasName, UUID.randomUUID().toString(), Bindings.STRING);\r
  27         graph.claimLiteral(log, EVENT.HasModificationCounter, 0, Bindings.INTEGER);\r
  28         return log;\r
  29         }\r
  30 \r
  31     /**\r
  32      * Bumps the modification counter value of the event log of the specified\r
  33      * events using {@link #bumpModificationCounter(WriteGraph, Resource)}.\r
  34      * <p>\r
  35      * The code assumes that all events are from the same log.\r
  36      * \r
  37      * @param graph\r
  38      * @param forLogOfEvents\r
  39      * @throws DatabaseException\r
  40      */\r
  41     public static void bumpModificationCounter(WriteGraph graph, List<Resource> forLogOfEvents) throws DatabaseException {\r
  42         EventResource EVENT = EventResource.getInstance(graph);\r
  43         for (Resource event : forLogOfEvents) {\r
  44             Resource log = graph.syncRequest(new PossibleTypedParent(event, EVENT.EventLog));\r
  45             if (log != null) {\r
  46                 bumpModificationCounter(graph, log);\r
  47                 return;\r
  48             }\r
  49         }\r
  50     }\r
  51 \r
  52     /**\r
  53      * Bumps the modification counter of the specified event log by 1.\r
  54      * \r
  55      * @param graph\r
  56      * @param eventLog\r
  57      * @return new modification counter value\r
  58      * @throws DatabaseException\r
  59      */\r
  60     public static int bumpModificationCounter(WriteGraph graph, Resource eventLog) throws DatabaseException {\r
  61         EventResource EVENT = EventResource.getInstance(graph);\r
  62         Resource counter = graph.getPossibleObject(eventLog, EVENT.HasModificationCounter);\r
  63         if (counter != null) {\r
  64             Integer c = graph.getValue(counter, Bindings.INTEGER);\r
  65             c = c == null ? 1 : c+1;\r
  66             graph.claimValue(counter, c, Bindings.INTEGER);\r
  67             return c;\r
  68         }\r
  69         return 0;\r
  70     }\r
  71 \r
  72 }\r