tests/org.simantics.db.tests/src/org/simantics/db/tests/api/support/virtualGraphSupport/VirtualGraphExample.java

   1 package org.simantics.db.tests.api.support.virtualGraphSupport;
   2
   3 import org.simantics.db.ReadGraph;
   4 import org.simantics.db.RequestProcessor;
   5 import org.simantics.db.Resource;
   6 import org.simantics.db.Session;
   7 import org.simantics.db.Statement;
   8 import org.simantics.db.VirtualGraph;
   9 import org.simantics.db.WriteGraph;
  10 import org.simantics.db.common.request.ReadRequest;
  11 import org.simantics.db.common.request.WriteRequest;
  12 import org.simantics.db.common.request.WriteResultRequest;
  13 import org.simantics.db.common.utils.NameUtils;
  14 import org.simantics.db.exception.DatabaseException;
  15 import org.simantics.db.service.VirtualGraphSupport;
  16 import org.simantics.layer0.Layer0;
  17
  18 /**
  19  * Not really created into a proper test, more a demonstration that is available
  20  * in <a href="http://dev.simantics.org/index.php/Virtual_Graphs">the Simantics
  21  * developer wiki</a>.
  22  *
  23  * @author Tuukka Lehtonen
  24  */
  25 public class VirtualGraphExample {
  26
  27     public Resource createLibrary(RequestProcessor processor, VirtualGraph vg, final String libraryName) throws DatabaseException {
  28         return processor.syncRequest(new WriteResultRequest<Resource>(vg) {
  29             @Override
  30             public Resource perform(WriteGraph graph) throws DatabaseException {
  31                 Layer0 L0 = Layer0.getInstance(graph);
  32                 Resource r = graph.newResource();
  33                 graph.claim(r, L0.InstanceOf, null, L0.Library);
  34                 graph.claimLiteral(r, L0.HasName, libraryName);
  35                 return r;
  36             }
  37         });
  38     }
  39
  40     public void testVirtualGraphs(Session session) throws DatabaseException {
  41         VirtualGraphSupport vgSupport = session.getService(VirtualGraphSupport.class);
  42         VirtualGraph memory = vgSupport.getMemoryPersistent("memory");
  43         VirtualGraph workspace = vgSupport.getWorkspacePersistent("workspace");
  44         // NOTICE: resource are created in difference virtual graphs in separate
  45         // transactions through Session.syncRequest.
  46         Resource memResource = createLibrary(session, memory, "memory");
  47         Resource workspaceResource = createLibrary(session, workspace, "workspace");
  48         printVirtualGraphs(session);
  49     }
  50
  51     public void testMultipleVirtualGraphsInSameTransaction(Session session) throws DatabaseException {
  52         final VirtualGraphSupport vgSupport = session.getService(VirtualGraphSupport.class);
  53         session.syncRequest(new WriteRequest() {
  54             @Override
  55             public void perform(WriteGraph graph) throws DatabaseException {
  56                 VirtualGraph memory = vgSupport.getMemoryPersistent("memory");
  57                 VirtualGraph workspace = vgSupport.getWorkspacePersistent("workspace");
  58                 // NOTICE: resource are created in different virtual graphs in
  59                 // the same transaction through WriteGraph.syncRequest
  60                 Resource memResource = createLibrary(graph, memory, "memory");
  61                 Resource workspaceResource = createLibrary(graph, workspace, "workspace");
  62             }
  63         });
  64         printVirtualGraphs(session);
  65     }
  66
  67     public void printVirtualGraphs(Session session) throws DatabaseException {
  68         session.syncRequest(new ReadRequest() {
  69             @Override
  70             public void run(ReadGraph graph) throws DatabaseException {
  71                 VirtualGraphSupport vgSupport = graph.getService(VirtualGraphSupport.class);
  72                 for (VirtualGraph vg : vgSupport.listGraphs()) {
  73                     for (Statement stm : vgSupport.listStatements(vg)) {
  74                         System.out.println("Statement: " + NameUtils.toString(graph, stm));
  75                     }
  76                     for (Resource r : vgSupport.listValues(vg)) {
  77                         System.out.println("Literal value: " + graph.getValue(r));
  78                     }
  79                 }
  80             }
  81         });
  82     }
  83
  84 }