/**
* Copyright (c) 2002-2011 "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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.transaction;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.junit.Test;
import org.neo4j.kernel.impl.AbstractNeo4jTestCase;
import org.neo4j.kernel.impl.transaction.TxLog;
import org.neo4j.kernel.impl.transaction.TxLog.Record;
public class TestTxLog
{
private void assertEqualByteArray( byte a[], byte b[] )
{
assertTrue( a.length == b.length );
for ( int i = 0; i < a.length; i++ )
{
assertEquals( a[i], b[i] );
}
}
private String path()
{
String path = AbstractNeo4jTestCase.getStorePath( "txlog" );
new File( path ).mkdirs();
return path;
}
private String file( String name )
{
return path() + File.separator + name;
}
private String txFile()
{
return file( "tx_test_log.tx" );
}
@Test
public void testTxLog() throws IOException
{
File file = new File( txFile() );
if ( file.exists() )
{
file.delete();
}
try
{
TxLog txLog = new TxLog( txFile() );
assertTrue( !txLog.getDanglingRecords().hasNext() );
byte globalId[] = new byte[64];
byte branchId[] = new byte[45];
txLog.txStart( globalId );
txLog.addBranch( globalId, branchId );
assertEquals( 2, txLog.getRecordCount() );
// List lists[] = txLog.getDanglingRecords();
List<?> lists[] = getRecordLists( txLog.getDanglingRecords() );
assertEquals( 1, lists.length );
List<?> records = lists[0];
assertEquals( 2, records.size() );
TxLog.Record record = (TxLog.Record) records.get( 0 );
assertEquals( TxLog.TX_START, record.getType() );
assertEqualByteArray( globalId, record.getGlobalId() );
assertTrue( null == record.getBranchId() );
record = (TxLog.Record) records.get( 1 );
assertEquals( TxLog.BRANCH_ADD, record.getType() );
assertEqualByteArray( globalId, record.getGlobalId() );
assertEqualByteArray( branchId, record.getBranchId() );
txLog.markAsCommitting( globalId );
assertEquals( 3, txLog.getRecordCount() );
txLog.close();
txLog = new TxLog( txFile() );
assertEquals( 0, txLog.getRecordCount() );
lists = getRecordLists( txLog.getDanglingRecords() );
assertEquals( 1, lists.length );
records = lists[0];
assertEquals( 3, records.size() );
record = (TxLog.Record) records.get( 0 );
assertEquals( TxLog.TX_START, record.getType() );
assertEqualByteArray( globalId, record.getGlobalId() );
assertTrue( null == record.getBranchId() );
record = (TxLog.Record) records.get( 1 );
assertEquals( TxLog.BRANCH_ADD, record.getType() );
assertEqualByteArray( globalId, record.getGlobalId() );
assertEqualByteArray( branchId, record.getBranchId() );
record = (TxLog.Record) records.get( 2 );
assertEquals( TxLog.MARK_COMMIT, record.getType() );
assertEqualByteArray( globalId, record.getGlobalId() );
assertTrue( null == record.getBranchId() );
txLog.txDone( globalId );
assertEquals( 1, txLog.getRecordCount() );
assertEquals( 0,
getRecordLists( txLog.getDanglingRecords() ).length );
txLog.close();
txLog = new TxLog( txFile() );
assertEquals( 0,
getRecordLists( txLog.getDanglingRecords() ).length );
txLog.close();
}
finally
{
file = new File( txFile() );
if ( file.exists() )
{
file.delete();
}
}
}
private List<?>[] getRecordLists( Iterator<List<Record>> danglingRecords )
{
List<List<?>> list = new ArrayList<List<?>>();
while ( danglingRecords.hasNext() )
{
list.add( danglingRecords.next() );
}
return list.toArray( new List[list.size()] );
}
@Test
public void testTruncateTxLog() throws IOException
{
File file = new File( txFile() );
if ( file.exists() )
{
file.delete();
}
try
{
TxLog txLog = new TxLog( txFile() );
byte globalId[] = new byte[64];
byte branchId[] = new byte[45];
txLog.txStart( globalId );
txLog.addBranch( globalId, branchId );
txLog.markAsCommitting( globalId );
txLog.truncate();
assertEquals( 0,
getRecordLists( txLog.getDanglingRecords() ).length );
txLog.close();
txLog = new TxLog( txFile() );
txLog.txStart( globalId );
txLog.addBranch( globalId, branchId );
txLog.markAsCommitting( globalId );
txLog.close();
txLog = new TxLog( txFile() );
assertEquals( 1,
getRecordLists( txLog.getDanglingRecords() ).length );
txLog.truncate();
assertEquals( 0,
getRecordLists( txLog.getDanglingRecords() ).length );
}
finally
{
file = new File( txFile() );
if ( file.exists() )
{
file.delete();
}
}
}
@Test
public void testTxRecovery()
{
// TODO
}
}