package org.neo4j.onlinebackup;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource;
/**
* Try to backup Neo4j to another running Neo4j instance.
*/
public class SimpleRunningTest
{
private static enum MyRels implements RelationshipType
{
TEST
}
private static final String FILE_SEP = System
.getProperty( "file.separator" );
private static final String TARGET_DIR = "target";
private static final String VAR = TARGET_DIR + FILE_SEP + "var";
private static final String STORE_LOCATION_DIR = VAR + FILE_SEP + "neo-db";
private static final String BACKUP_LOCATION_DIR = VAR + FILE_SEP
+ "neo-backup";
@Before
public void clean()
{
Util.deleteDir( new File( VAR ) );
System.out.println( "setting up simple database and backup-copy" );
EmbeddedGraphDatabase graphDb = Util.startGraphDbInstance( STORE_LOCATION_DIR );
((NeoStoreXaDataSource) graphDb.getConfig().getPersistenceModule()
.getPersistenceManager().getPersistenceSource()
.getXaDataSource()).keepLogicalLogs( true );
Transaction tx = graphDb.beginTx();
try
{
addNode( graphDb );
tx.success();
}
finally
{
tx.finish();
}
Util.stopGraphDb( graphDb );
Util.copyDir( STORE_LOCATION_DIR, BACKUP_LOCATION_DIR );
}
@Test
public void backup() throws IOException
{
EmbeddedGraphDatabase graphDb = Util.startGraphDbInstance( STORE_LOCATION_DIR );
((NeoStoreXaDataSource) graphDb.getConfig().getPersistenceModule()
.getPersistenceManager().getPersistenceSource().getXaDataSource())
.keepLogicalLogs( true );
System.out.println( "backing up original db without any changes" );
tryBackup( graphDb, BACKUP_LOCATION_DIR, 1 );
Transaction tx = graphDb.beginTx();
try
{
addNode( graphDb );
tx.success();
}
finally
{
tx.finish();
}
System.out.println( "one node added" );
tryBackup( graphDb, BACKUP_LOCATION_DIR, 2 );
tx = graphDb.beginTx();
try
{
addNode( graphDb );
tx.success();
}
finally
{
tx.finish();
}
System.out.println( "one node added" );
tx = graphDb.beginTx();
try
{
addNode( graphDb );
System.out.println( "one node added, not commited" );
tryBackup( graphDb, BACKUP_LOCATION_DIR, 3 );
tx.success();
}
finally
{
tx.finish();
}
System.out.println( "previous add commited" );
tryBackup( graphDb, BACKUP_LOCATION_DIR, 4 );
Util.stopGraphDb( graphDb );
}
protected void tryBackup( EmbeddedGraphDatabase graphDb, String location, int relCount )
throws IOException
{
System.out.println( "backing up to running EmbeddedGraphDatabase instance" );
EmbeddedGraphDatabase bDb = Util.startGraphDbInstance( location );
Backup backupComp = new Neo4jBackup( graphDb, bDb );
backupComp.enableFileLogger();
backupComp.doBackup();
Util.stopGraphDb( bDb );
bDb = Util.startGraphDbInstance( location );
Transaction bTx = bDb.beginTx();
try
{
List<Relationship> rels = new ArrayList<Relationship>();
for ( Relationship rel : bDb.getReferenceNode().getRelationships() )
{
rels.add( rel );
}
assertEquals( relCount, rels.size() );
bTx.success();
}
finally
{
bTx.finish();
}
Util.stopGraphDb( bDb );
}
private void addNode( EmbeddedGraphDatabase graphDb )
{
Node referenceNode = graphDb.getReferenceNode();
Node node = graphDb.createNode();
referenceNode.createRelationshipTo( node, MyRels.TEST );
}
}