bundles/org.simantics.event/src/org/simantics/event/EventSupport.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     Semantum Oy - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.event;
  13
  14 import java.util.UUID;
  15
  16 import org.simantics.databoard.Bindings;
  17 import org.simantics.db.Resource;
  18 import org.simantics.db.WriteGraph;
  19 import org.simantics.db.common.request.WriteRequest;
  20 import org.simantics.db.exception.DatabaseException;
  21 import org.simantics.db.service.VirtualGraphSupport;
  22 import org.simantics.event.ontology.EventResource;
  23 import org.simantics.event.writer.EventSourceResolver;
  24 import org.simantics.event.writer.EventWriteTask;
  25 import org.simantics.event.writer.EventWriterJob;
  26 import org.simantics.layer0.Layer0;
  27
  28 /**
  29  * @author Tuukka Lehtonen
  30  */
  31 public class EventSupport {
  32
  33     private Resource model;
  34     private Resource run;
  35     private EventSourceResolver.Filter filter;
  36
  37     @SuppressWarnings("unused")
  38     private Resource eventLog;
  39
  40     private EventWriterJob writer;
  41     private EventSourceResolver resolver;
  42
  43     public EventSupport(Resource model, Resource run, EventSourceResolver.Filter filter) {
  44         this.model = model;
  45         this.run = run;
  46         this.filter = filter;
  47     }
  48
  49     public Resource initialize(WriteGraph graph) throws DatabaseException {
  50         Layer0 L0 = Layer0.getInstance(graph);
  51         final EventResource EVENT = EventResource.getInstance(graph);
  52
  53         Resource log = graph.newResource();
  54         this.eventLog = log;
  55         graph.claim(log, L0.InstanceOf, null, EVENT.EventLog);
  56         graph.claimLiteral(log, L0.HasName, UUID.randomUUID().toString(), Bindings.STRING);
  57         graph.claim(model, EVENT.HasEventLog, log);
  58         graph.claim(model, L0.ConsistsOf, log);
  59
  60         // Switch write to graph of run resource
  61         final Resource _log = log;
  62         VirtualGraphSupport support = graph.getService(VirtualGraphSupport.class);
  63         graph.syncRequest(new WriteRequest( support.getGraph(graph, run) ) {
  64             @Override
  65             public void perform(WriteGraph graph) throws DatabaseException {
  66                 graph.claim(_log, EVENT.HasEventProducer, run);
  67             }
  68         });
  69
  70         // Start event writer & resolver services
  71         this.resolver = new EventSourceResolver(graph.getProvider(), log, filter);
  72         this.writer = new EventWriterJob(graph.getProvider(), log, this.resolver);
  73         this.resolver.schedule();
  74
  75         return log;
  76     }
  77
  78     public void queue(EventWriteTask task) {
  79         EventWriterJob w = writer;
  80         if (w != null)
  81             w.queue(task);
  82     }
  83
  84     public void dispose() {
  85         if (writer != null) {
  86             writer.dispose();
  87             writer = null;
  88         }
  89         if (resolver != null) {
  90             resolver.dispose();
  91             resolver = null;
  92         }
  93     }
  94
  95 }