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LegacyLogs.java
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LegacyLogs.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.impl.storemigration.legacylogs;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.neo4j.cursor.IOCursor;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.impl.storemigration.ExistingTargetStrategy;
import org.neo4j.kernel.impl.storemigration.FileOperation;
import org.neo4j.kernel.impl.transaction.log.LogVersionedStoreChannel;
import org.neo4j.kernel.impl.transaction.log.NoSuchTransactionException;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntry;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryCommit;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryStart;
import org.neo4j.kernel.impl.transaction.log.entry.LogHeader;
import static org.neo4j.kernel.impl.storemigration.legacylogs.LegacyLogFilenames.allLegacyLogFilesFilter;
import static org.neo4j.kernel.impl.storemigration.legacylogs.LegacyLogFilenames.getLegacyLogVersion;
import static org.neo4j.kernel.impl.storemigration.legacylogs.LegacyLogFilenames.versionedLegacyLogFilesFilter;
import static org.neo4j.kernel.impl.transaction.log.PhysicalLogFile.DEFAULT_NAME;
import static org.neo4j.kernel.impl.transaction.log.PhysicalLogFile.DEFAULT_VERSION_SUFFIX;
public class LegacyLogs
{
private final FileSystemAbstraction fs;
private final LegacyLogEntryReader reader;
private final LegacyLogEntryWriter writer;
private final Comparator<File> NEWEST_FIRST = new Comparator<File>()
{
@Override
public int compare( File o1, File o2 )
{
return versionOf( o1 ).compareTo( versionOf( o2 ) );
}
private Long versionOf( File file )
{
Pair<LogHeader, IOCursor<LogEntry>> pair = null;
try
{
pair = reader.openReadableChannel( file );
LogHeader header = pair.first();
return Long.valueOf( header.logVersion );
}
catch ( IOException e )
{ // Shouldn't happen
throw new RuntimeException( e );
}
finally
{
if ( pair != null )
{
try
{
pair.other().close();
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
}
}
};
public LegacyLogs( FileSystemAbstraction fs )
{
this( fs, new LegacyLogEntryReader( fs ), new LegacyLogEntryWriter( fs ) );
}
LegacyLogs( FileSystemAbstraction fs, LegacyLogEntryReader reader, LegacyLogEntryWriter writer )
{
this.fs = fs;
this.reader = reader;
this.writer = writer;
}
public void migrateLogs( File storeDir, File migrationDir ) throws IOException
{
File[] logFiles = fs.listFiles( storeDir, versionedLegacyLogFilesFilter );
for ( File file : logFiles )
{
final Pair<LogHeader, IOCursor<LogEntry>> pair = reader.openReadableChannel( file );
final LogHeader header = pair.first();
try ( IOCursor<LogEntry> cursor = pair.other();
LogVersionedStoreChannel channel =
writer.openWritableChannel( new File( migrationDir, file.getName() ) ) )
{
writer.writeLogHeader( channel, header );
writer.writeAllLogEntries( channel, cursor );
}
}
}
public long getTransactionChecksum( File storeDir, long transactionId ) throws IOException
{
List<File> logFiles = Arrays.asList( fs.listFiles( storeDir, versionedLegacyLogFilesFilter ) );
Collections.sort( logFiles, NEWEST_FIRST );
for ( File file : logFiles )
{
Pair<LogHeader, IOCursor<LogEntry>> pair = reader.openReadableChannel( file );
boolean hadAnyTransactions = false;
try ( IOCursor<LogEntry> cursor = pair.other() )
{
// The log entries will come sorted from this cursor, so no need to keep track of identifiers and such.
LogEntryStart startEntry = null;
while ( cursor.next() )
{
LogEntry logEntry = cursor.get();
if ( logEntry instanceof LogEntryStart )
{
startEntry = (LogEntryStart) logEntry;
}
else if ( logEntry instanceof LogEntryCommit )
{
hadAnyTransactions = true;
LogEntryCommit commitEntry = logEntry.as();
if ( commitEntry.getTxId() == transactionId )
{
return startEntry.checksum();
}
}
}
}
if ( hadAnyTransactions )
{
// No need to go further back than this. We're looking for the last transaction
break;
}
}
throw new NoSuchTransactionException( transactionId );
}
public void operate( FileOperation op, File from, File to ) throws IOException
{
File[] logFiles = fs.listFiles( from, versionedLegacyLogFilesFilter );
for ( File file : logFiles )
{
op.perform( fs, file.getName(), from, false, to, ExistingTargetStrategy.OVERWRITE );
}
}
public void renameLogFiles( File storeDir ) throws IOException
{
// rename files
for ( File file : fs.listFiles( storeDir, versionedLegacyLogFilesFilter ) )
{
final String oldName = file.getName();
final long version = getLegacyLogVersion( oldName );
final String newName = DEFAULT_NAME + DEFAULT_VERSION_SUFFIX + version;
fs.renameFile( file, new File( file.getParent(), newName ) );
}
deleteUnusedLogFiles( storeDir );
}
public void deleteUnusedLogFiles( File storeDir )
{
// delete old an unused log files
for ( File file : fs.listFiles( storeDir, allLegacyLogFilesFilter ) )
{
fs.deleteFile( file );
}
}
}