tests/org.simantics.db.tests/src/org/simantics/db/tests/api/write/request/WriteCallbackFailureTest.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.write.request;
  13
  14 import java.util.concurrent.Semaphore;
  15
  16 import org.junit.Test;
  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.testing.base.ExistingDatabaseTest;
  22 import org.simantics.layer0.Layer0;
  23 import org.simantics.utils.datastructures.Callback;
  24
  25 /**
  26  * Checks that unexpected write callback failures do not crash the session and
  27  * that the write request results were correctly committed.
  28  *
  29  * @author Tuukka Lehtonen
  30  */
  31 public class WriteCallbackFailureTest extends ExistingDatabaseTest {
  32
  33     private static final String AN_ENTITY = "An entity";
  34     Resource written;
  35
  36         @Test
  37     public void testFailingWriteCallback() throws DatabaseException{
  38         final Semaphore sem = new Semaphore(0);
  39
  40         getSession().asyncRequest(new WriteRequest() {
  41             @Override
  42             public void perform(WriteGraph graph) throws DatabaseException {
  43                 Layer0 b = Layer0.getInstance(graph);
  44                 Resource test = graph.newResource();
  45                 graph.claim(test, b.InstanceOf, null, b.Entity);
  46                 Resource name = graph.newResource();
  47                 graph.claim(name, b.InstanceOf, null, b.String);
  48                 graph.claimValue(name, AN_ENTITY);
  49                 graph.claim(test, b.HasName, name);
  50
  51                 written = test;
  52             }
  53         }, new Callback<DatabaseException>() {
  54             @Override
  55             public void run(DatabaseException parameter) {
  56                 try {
  57                     throw new NullPointerException("intentional failure");
  58                 } finally {
  59                     sem.release();
  60                 }
  61             }
  62         });
  63
  64         try {
  65             sem.acquire();
  66         } catch (InterruptedException e) {
  67             throw new DatabaseException(e);
  68         }
  69
  70         // This will block until the previous request has finished.
  71         getSession().syncRequest(new WriteRequest() {
  72             @Override
  73             public void perform(WriteGraph graph) throws DatabaseException {
  74                 Layer0 b = Layer0.getInstance(graph);
  75                 // Ensure that the previously written data exists.
  76                 assertTrue(graph.hasStatement(written, b.InstanceOf, b.Entity));
  77                 Resource name = graph.getSingleObject(written, b.HasName);
  78                 assertTrue(graph.hasStatement(name, b.InstanceOf, b.String));
  79                 assertTrue(graph.hasStatement(written, b.HasName, name));
  80                 Object value = graph.getValue(name);
  81                 assertTrue(value.equals(AN_ENTITY));
  82             }
  83         });
  84     }
  85
  86 }