ChangeTrackingStorageConnectorTest.java

package cz.cvut.kbss.ontodriver.jena.connector;

import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import cz.cvut.kbss.ontodriver.util.Vocabulary;
import org.apache.jena.rdf.model.ResourceFactory;
import org.apache.jena.rdf.model.Statement;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Collections;

import static cz.cvut.kbss.ontodriver.jena.connector.StorageTestUtil.*;
import static org.apache.jena.rdf.model.ResourceFactory.*;
import static org.junit.Assert.*;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.spy;

public class ChangeTrackingStorageConnectorTest {

    private SharedStorageConnector centralConnector;
    private ChangeTrackingStorageConnector connector;

    @Before
    public void setUp() {
        final Configuration configuration = StorageTestUtil.createConfiguration("test:uri");
        this.centralConnector = new SharedStorageConnector(configuration);
        this.connector = new ChangeTrackingStorageConnector(centralConnector);
    }

    @After
    public void tearDown() {
        centralConnector.close();
    }

    @Test
    public void beginCreatesNewLocalModel() throws Exception {
        assertNull(getLocalModel());
        connector.begin();
        assertNotNull(getLocalModel());
        assertTrue(connector.transaction.isActive());
    }

    private LocalModel getLocalModel() throws Exception {
        final Field field = ChangeTrackingStorageConnector.class.getDeclaredField("localModel");
        field.setAccessible(true);
        return (LocalModel) field.get(connector);
    }

    @Test
    public void findEnhancesResultFromCentralConnectorWithTransactionalChangesFromLocalModel() throws Exception {
        centralConnector.begin();
        final Statement existing = ResourceFactory
                .createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                        createResource(TYPE_ONE));
        centralConnector.add(Collections.singletonList(existing));
        centralConnector.commit();
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added));
        final Collection<Statement> result = connector.find(createResource(RESOURCE), null, null);
        assertEquals(2, result.size());
        assertTrue(result.contains(existing));
        assertTrue(result.contains(added));
    }

    @Test
    public void findEnhancesResultFromCentralConnectorWithTransactionalChangesFromLocalModel_Context()
            throws Exception {
        centralConnector.begin();
        final Statement existing = ResourceFactory
                .createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                        createResource(TYPE_ONE));
        centralConnector.add(Collections.singletonList(existing));
        centralConnector.commit();
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added), NAMED_GRAPH);
        final Collection<Statement> result = connector.find(createResource(RESOURCE), null, null, NAMED_GRAPH);
        assertEquals(1, result.size());
        assertTrue(result.contains(added));
    }

    @Test
    public void containsReturnsTrueForStatementsPresentInLocalChanges() throws Exception {
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added));
        assertTrue(connector.contains(null, null, added.getObject()));
    }

    @Test
    public void containsChecksCentralConnectorWhenLocalChangesDoNotContainValue() throws Exception {
        centralConnector.begin();
        final Statement existing = ResourceFactory
                .createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                        createResource(TYPE_ONE));
        centralConnector.add(Collections.singletonList(existing));
        centralConnector.commit();
        connector.begin();
        assertTrue(connector.contains(null, null, createResource(TYPE_ONE)));
    }

    @Test
    public void containsReturnsFalseForStatementLocallyRemoved() throws Exception {
        centralConnector.begin();
        final Statement existing = ResourceFactory
                .createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                        createResource(TYPE_ONE));
        centralConnector.add(Collections.singletonList(existing));
        centralConnector.commit();
        connector.begin();
        final Statement removed = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_ONE));
        getLocalModel().removeStatements(Collections.singletonList(removed));
        assertFalse(connector.contains(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE), null));
    }

    @Test
    public void containsWorksInContextAsWell() throws Exception {
        centralConnector.begin();
        final Statement existing = ResourceFactory
                .createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                        createResource(TYPE_ONE));
        centralConnector.add(Collections.singletonList(existing), NAMED_GRAPH);
        centralConnector.commit();
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added));
        assertFalse(connector.contains(null, null, added.getObject(), NAMED_GRAPH));
    }

    @Test
    public void addAddsStatementsToLocalModel() throws Exception {
        final Statement statement = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        connector.begin();
        assertTrue(getLocalModel().getAdded().isEmpty());
        connector.add(Collections.singletonList(statement));
        assertTrue(getLocalModel().getAdded().getDefaultModel().contains(statement));
    }

    @Test
    public void addAddsStatementsToCorrectContextInLocalModel() throws Exception {
        final Statement statement = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        connector.begin();
        assertTrue(getLocalModel().getAdded().isEmpty());
        connector.add(Collections.singletonList(statement), NAMED_GRAPH);
        assertTrue(getLocalModel().getAdded().getNamedModel(NAMED_GRAPH).contains(statement));
    }

    @Test
    public void removeAddsStatementsToLocalModelForRemoval() throws Exception {
        final Statement statement = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_ONE));
        connector.begin();
        assertTrue(getLocalModel().getRemoved().isEmpty());
        connector.remove(Collections.singletonList(statement));
        assertTrue(getLocalModel().getRemoved().getDefaultModel().contains(statement));
    }

    @Test
    public void removeAddsStatementsForRemovalToCorrectContextInLocalModel() throws Exception {
        final Statement statement = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_ONE));
        connector.begin();
        assertTrue(getLocalModel().getRemoved().isEmpty());
        connector.remove(Collections.singletonList(statement), NAMED_GRAPH);
        assertTrue(getLocalModel().getRemoved().getNamedModel(NAMED_GRAPH).contains(statement));
    }

    @Test
    public void rollbackDiscardsLocalModel() throws Exception {
        final Statement statement = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        connector.begin();
        connector.add(Collections.singletonList(statement));
        connector.rollback();
        assertNull(getLocalModel());
        assertFalse(connector.transaction.isActive());
    }

    @Test
    public void commitAppliesChangesFromLocalModelToCentralConnector() throws Exception {
        final Statement removed = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_ONE));
        centralConnector.begin();
        centralConnector.add(Collections.singletonList(removed));
        centralConnector.commit();
        connector.begin();
        getLocalModel().removeStatements(Collections.singletonList(removed));
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added));
        connector.commit();
        assertTrue(centralConnector.contains(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO)));
        assertFalse(centralConnector.contains(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_ONE)));
    }

    @Test
    public void commitAppliesChangesInContexts() throws Exception {
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added), NAMED_GRAPH);
        connector.commit();
        assertTrue(centralConnector.contains(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO), NAMED_GRAPH));
    }

    @Test
    public void commitDiscardsLocalModelOnSuccessfulFinish() throws Exception {
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added), NAMED_GRAPH);
        connector.commit();
        assertNull(getLocalModel());
        assertFalse(connector.transaction.isActive());
    }

    @Test(expected = JenaDriverException.class)
    public void commitRollsBackChangesOnException() throws Exception {
        connector.begin();
        final Statement added = createStatement(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                createResource(TYPE_TWO));
        getLocalModel().addStatements(Collections.singletonList(added), NAMED_GRAPH);
        centralConnector.storage = spy(centralConnector.storage);
        doThrow(new JenaDriverException("Write failed.")).when(centralConnector.storage).writeChanges();
        try {
            connector.commit();
        } finally {
            assertFalse(centralConnector.contains(createResource(RESOURCE), createProperty(Vocabulary.RDF_TYPE),
                    createResource(TYPE_TWO), NAMED_GRAPH));
        }
    }
}