org.neo4j.graphdb.LuceneLabelScanStoreIT.java Source code

Introduction

Here is the source code for org.neo4j.graphdb.LuceneLabelScanStoreIT.java

Source

/*
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.graphdb;

import org.apache.commons.lang3.ArrayUtils;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.io.fs.FileUtils;
import org.neo4j.kernel.NeoStoreDataSource;
import org.neo4j.kernel.api.labelscan.LabelScanStore;
import org.neo4j.kernel.api.labelscan.LabelScanWriter;
import org.neo4j.kernel.api.labelscan.NodeLabelUpdate;
import org.neo4j.kernel.impl.api.scan.LabelScanStoreProvider;
import org.neo4j.kernel.impl.transaction.state.DataSourceManager;
import org.neo4j.storageengine.api.schema.LabelScanReader;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;

public class LuceneLabelScanStoreIT extends LabelScanStoreIT {

    @Test
    public void scanStoreStartWithoutExistentIndex() throws IOException {
        NeoStoreDataSource dataSource = getDataSource();
        LabelScanStore labelScanStore = getLabelScanStore();
        labelScanStore.shutdown();

        File labelScanStoreDirectory = getLabelScanStoreDirectory(dataSource);
        FileUtils.deleteRecursively(labelScanStoreDirectory);

        labelScanStore.init();
        labelScanStore.start();

        checkLabelScanStoreAccessible(labelScanStore);
    }

    @Test
    public void scanStoreRecreateCorruptedIndexOnStartup() throws IOException {
        NeoStoreDataSource dataSource = getDataSource();
        LabelScanStore labelScanStore = getLabelScanStore();

        Node node = createTestNode();
        long[] labels = readNodeLabels(labelScanStore, node);
        assertEquals("Label scan store see 1 label for node", 1, labels.length);
        labelScanStore.force();
        labelScanStore.shutdown();

        corruptIndex(dataSource);

        labelScanStore.init();
        labelScanStore.start();

        long[] rebuildLabels = readNodeLabels(labelScanStore, node);
        assertArrayEquals("Store should rebuild corrupted index", labels, rebuildLabels);
    }

    private long[] readNodeLabels(LabelScanStore labelScanStore, Node node) {
        try (LabelScanReader reader = labelScanStore.newReader()) {
            return PrimitiveLongCollections.asArray(reader.labelsForNode(node.getId()));
        }
    }

    private Node createTestNode() {
        Node node = null;
        try (Transaction transaction = dbRule.beginTx()) {
            node = dbRule.createNode(Label.label("testLabel"));
            transaction.success();
        }
        return node;
    }

    private void corruptIndex(NeoStoreDataSource dataSource) throws IOException {
        File labelScanStoreDirectory = getLabelScanStoreDirectory(dataSource);
        Files.walkFileTree(labelScanStoreDirectory.toPath(), new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                Files.write(file, ArrayUtils.add(Files.readAllBytes(file), (byte) 7));
                return FileVisitResult.CONTINUE;
            }
        });
    }

    private File getLabelScanStoreDirectory(NeoStoreDataSource dataSource) {
        return LabelScanStoreProvider.getStoreDirectory(dataSource.getStoreDir());
    }

    private NeoStoreDataSource getDataSource() {
        DependencyResolver dependencyResolver = dbRule.getDependencyResolver();
        DataSourceManager dataSourceManager = dependencyResolver.resolveDependency(DataSourceManager.class);
        return dataSourceManager.getDataSource();
    }

    private LabelScanStore getLabelScanStore() {
        DependencyResolver dependencyResolver = dbRule.getDependencyResolver();
        return dependencyResolver.resolveDependency(LabelScanStore.class);
    }

    private void checkLabelScanStoreAccessible(LabelScanStore labelScanStore) throws IOException {
        try (LabelScanWriter labelScanWriter = labelScanStore.newWriter()) {
            labelScanWriter.write(NodeLabelUpdate.labelChanges(1, new long[] {}, new long[] { 1 }));
        }
        try (LabelScanReader labelScanReader = labelScanStore.newReader()) {
            assertEquals(1, labelScanReader.labelsForNode(1).next());
        }
    }

}