tests/org.simantics.db.tests/src/org/simantics/db/tests/api/request/exception/RecoveryFromExceptedState.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 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  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.tests.api.request.exception;
  13
  14 import org.junit.Test;
  15 import org.simantics.db.ReadGraph;
  16 import org.simantics.db.Resource;
  17 import org.simantics.db.Session;
  18 import org.simantics.db.WriteGraph;
  19 import org.simantics.db.common.procedure.adapter.ListenerAdapter;
  20 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
  21 import org.simantics.db.common.request.WriteRequest;
  22 import org.simantics.db.common.request.WriteResultRequest;
  23 import org.simantics.db.exception.DatabaseException;
  24 import org.simantics.db.exception.ResourceNotFoundException;
  25 import org.simantics.db.request.Read;
  26 import org.simantics.db.testing.base.ExistingDatabaseTest;
  27 import org.simantics.layer0.Layer0;
  28
  29 public class RecoveryFromExceptedState extends ExistingDatabaseTest {
  30
  31         @Test
  32         public void test() throws Exception {
  33
  34                 Session session = getSession();
  35
  36                 final Layer0 L0 = Layer0.getInstance(session);
  37
  38                 final Resource A = session.syncRequest(new WriteResultRequest<Resource>() {
  39
  40                         @Override
  41                         public Resource perform(WriteGraph graph) throws DatabaseException {
  42
  43                                 Resource root = graph.getRootLibrary();
  44                                 Resource part = graph.newResource();
  45                                 graph.claim(part, L0.InstanceOf, null, L0.Entity);
  46                                 graph.claim(part, L0.PartOf, root);
  47                                 graph.claimLiteral(part, L0.HasName, "A");
  48                                 return part;
  49
  50                         }
  51
  52                 });
  53
  54                 try {
  55
  56                         /*
  57                          * Create the request. Listening is needed to enforce update of the query in subsequent write
  58                          */
  59                         session.syncRequest(new Read<Resource>() {
  60
  61                                 @Override
  62                                 public Resource perform(ReadGraph graph) throws DatabaseException {
  63                                         return graph.getResource("http://A");
  64                                 }
  65
  66                         }, new ListenerAdapter<Resource>() {
  67                                 @Override
  68                                 public boolean isDisposed() {
  69                                         return false;
  70                                 }
  71                         });
  72
  73                         /*
  74                          * Invalidates the request. Request is updated (is has a listener) and enters 'Excepted' state.
  75                          */
  76                         session.syncRequest(new WriteRequest() {
  77
  78                                 @Override
  79                                 public void perform(WriteGraph graph) throws DatabaseException {
  80
  81                                         graph.deny(A);
  82                                         graph.deny(graph.getRootLibrary(), L0.ConsistsOf, A);
  83
  84                                 }
  85
  86                         });
  87
  88                         /*
  89                          * After this write the result is again valid. The request should be updated to 'Ready' state.
  90                          */
  91                         session.syncRequest(new WriteRequest() {
  92
  93                                 @Override
  94                                 public void perform(WriteGraph graph) throws DatabaseException {
  95
  96                                         Resource root = graph.getRootLibrary();
  97                                         Resource part = graph.newResource();
  98                                         graph.claim(part, L0.InstanceOf, null, L0.Entity);
  99                                         graph.claim(part, L0.PartOf, root);
 100                                         graph.claimLiteral(part, L0.HasName, "A");
 101
 102                                 }
 103
 104                         });
 105
 106                         /*
 107                          * Validate the situation.
 108                          */
 109                         session.syncRequest(new Read<Resource>() {
 110
 111                                 @Override
 112                                 public Resource perform(ReadGraph graph) throws DatabaseException {
 113                                         return graph.getResource("http://A");
 114                                 }
 115
 116                         }, TransientCacheListener.<Resource>instance());
 117
 118                 } catch(ResourceNotFoundException e) {
 119
 120                 fail("getResource threw ResourceNotFoundException");
 121
 122                 }
 123
 124         }
 125
 126 }