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LegacyLogEntryWriter.java
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LegacyLogEntryWriter.java
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/*
* Copyright (c) 2002-2017 "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.ArrayList;
import java.util.List;
import java.util.function.Function;
import org.neo4j.cursor.IOCursor;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.fs.StoreChannel;
import org.neo4j.kernel.impl.transaction.log.FlushableChannel;
import org.neo4j.kernel.impl.transaction.log.LogVersionedStoreChannel;
import org.neo4j.kernel.impl.transaction.log.PhysicalLogVersionedStoreChannel;
import org.neo4j.kernel.impl.transaction.log.PhysicalTransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.PositionAwarePhysicalFlushableChannel;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntry;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryCommand;
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.LogEntryWriter;
import org.neo4j.kernel.impl.transaction.log.entry.LogHeader;
import org.neo4j.kernel.impl.transaction.log.entry.LogHeaderWriter;
import org.neo4j.storageengine.api.StorageCommand;
import static org.neo4j.kernel.impl.storemigration.legacylogs.LegacyLogFilenames.getLegacyLogVersion;
import static org.neo4j.kernel.impl.transaction.log.entry.LogVersions.CURRENT_LOG_VERSION;
class LegacyLogEntryWriter
{
private static final Function<FlushableChannel, LogEntryWriter> defaultLogEntryWriterFactory =
LogEntryWriter::new;
private final FileSystemAbstraction fs;
private final Function<FlushableChannel, LogEntryWriter> factory;
LegacyLogEntryWriter( FileSystemAbstraction fs )
{
this( fs, defaultLogEntryWriterFactory );
}
LegacyLogEntryWriter( FileSystemAbstraction fs, Function<FlushableChannel, LogEntryWriter> factory )
{
this.fs = fs;
this.factory = factory;
}
public LogVersionedStoreChannel openWritableChannel( File file ) throws IOException
{
final StoreChannel storeChannel = fs.open( file, "rw" );
final long version = getLegacyLogVersion( file.getName() );
return new PhysicalLogVersionedStoreChannel( storeChannel, version, CURRENT_LOG_VERSION );
}
public void writeLogHeader( LogVersionedStoreChannel channel, LogHeader header ) throws IOException
{
LogHeaderWriter.writeLogHeader( channel, header.logVersion, header.lastCommittedTxId );
}
public void writeAllLogEntries( LogVersionedStoreChannel channel, IOCursor<LogEntry> cursor ) throws IOException
{
try ( PositionAwarePhysicalFlushableChannel writable = new PositionAwarePhysicalFlushableChannel( channel ) )
{
final LogEntryWriter writer = factory.apply( writable );
List<StorageCommand> commands = new ArrayList<>();
while ( cursor.next() )
{
LogEntry entry = cursor.get();
if ( entry instanceof LogEntryStart )
{
final LogEntryStart startEntry = entry.as();
writer.writeStartEntry( startEntry.getMasterId(), startEntry.getLocalId(),
startEntry.getTimeWritten(), startEntry.getLastCommittedTxWhenTransactionStarted(),
startEntry.getAdditionalHeader() );
}
else if ( entry instanceof LogEntryCommit )
{
if ( !commands.isEmpty() )
{
writer.serialize( new PhysicalTransactionRepresentation( commands ) );
commands = new ArrayList<>();
}
final LogEntryCommit commitEntry = (LogEntryCommit) entry;
writer.writeCommitEntry( commitEntry.getTxId(), commitEntry.getTimeWritten() );
}
else if ( entry instanceof LogEntryCommand )
{
commands.add( ((LogEntryCommand) entry).getXaCommand() );
}
else
{
throw new IllegalStateException( "Unknown entry: " + entry );
}
}
}
}
}