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ReadOnlyIndexSnapshotFileIteratorTest.java
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ReadOnlyIndexSnapshotFileIteratorTest.java
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/*
* 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.kernel.api.impl.index.backup;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.Directory;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.util.Set;
import java.util.stream.Stream;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.impl.index.IndexWriterConfigs;
import org.neo4j.kernel.api.impl.index.storage.DirectoryFactory;
import org.neo4j.test.TargetDirectory;
import static java.util.stream.Collectors.toSet;
import static junit.framework.TestCase.assertFalse;
import static org.junit.Assert.assertEquals;
public class ReadOnlyIndexSnapshotFileIteratorTest
{
@Rule
public final TargetDirectory.TestDirectory testDir = TargetDirectory.testDirForTest( getClass() );
protected File indexDir;
protected Directory dir;
@Before
public void setUp() throws IOException
{
indexDir = testDir.directory();
dir = DirectoryFactory.PERSISTENT.open( indexDir );
}
@After
public void tearDown() throws IOException
{
IOUtils.closeAll( dir );
}
@Test
public void shouldReturnRealSnapshotIfIndexAllowsIt() throws IOException
{
prepareIndex();
Set<String> files = listDir( dir );
assertFalse( files.isEmpty() );
try ( ResourceIterator<File> snapshot = makeSnapshot() )
{
Set<String> snapshotFiles = snapshot.stream().map( File::getName ).collect( toSet() );
assertEquals( files, snapshotFiles );
}
}
@Test
public void shouldReturnEmptyIteratorWhenNoCommitsHaveBeenMade() throws IOException
{
try ( ResourceIterator<File> snapshot = makeSnapshot() )
{
assertFalse( snapshot.hasNext() );
}
}
private void prepareIndex() throws IOException
{
try ( IndexWriter writer = new IndexWriter( dir, IndexWriterConfigs.standard() ) )
{
insertRandomDocuments( writer );
}
}
protected ResourceIterator<File> makeSnapshot() throws IOException
{
return LuceneIndexSnapshots.forIndex( indexDir, dir );
}
private static void insertRandomDocuments( IndexWriter writer ) throws IOException
{
Document doc = new Document();
doc.add( new StringField( "a", "b", Field.Store.YES ) );
doc.add( new StringField( "c", "d", Field.Store.NO ) );
writer.addDocument( doc );
writer.commit();
}
private static Set<String> listDir( Directory dir ) throws IOException
{
String[] files = dir.listAll();
return Stream.of( files )
.filter( file -> !IndexWriter.WRITE_LOCK_NAME.equals( file ) )
.collect( toSet() );
}
}