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