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SchemaIndexMigrator.java
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SchemaIndexMigrator.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.participant;
import java.io.File;
import java.io.IOException;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.api.index.SchemaIndexProvider;
import org.neo4j.kernel.impl.api.scan.LabelScanStoreProvider;
import org.neo4j.kernel.impl.store.format.CapabilityType;
import org.neo4j.kernel.impl.store.format.InternalRecordFormatSelector;
import org.neo4j.kernel.impl.store.format.RecordFormats;
import org.neo4j.kernel.impl.storemigration.monitoring.MigrationProgressMonitor;
/**
* Migrates schema and label indexes between different neo4j versions.
* Participates in store upgrade as one of the migration participants.
* <p>
* Since index format can be completely incompatible between version should be executed before {@link StoreMigrator}
*/
public class SchemaIndexMigrator extends AbstractStoreMigrationParticipant
{
private final FileSystemAbstraction fileSystem;
private boolean deleteObsoleteIndexes = false;
private File labelIndexDirectory;
private File schemaIndexDirectory;
private final SchemaIndexProvider schemaIndexProvider;
private final LabelScanStoreProvider labelScanStoreProvider;
public SchemaIndexMigrator( FileSystemAbstraction fileSystem, SchemaIndexProvider schemaIndexProvider,
LabelScanStoreProvider labelScanStoreProvider )
{
super( "Indexes" );
this.fileSystem = fileSystem;
this.schemaIndexProvider = schemaIndexProvider;
this.labelScanStoreProvider = labelScanStoreProvider;
}
@Override
public void migrate( File storeDir, File migrationDir, MigrationProgressMonitor.Section progressMonitor,
String versionToMigrateFrom, String versionToMigrateTo ) throws IOException
{
RecordFormats from = InternalRecordFormatSelector.fromVersion( versionToMigrateFrom );
RecordFormats to = InternalRecordFormatSelector.fromVersion( versionToMigrateTo );
if ( !from.hasSameCapabilities( to, CapabilityType.INDEX ) )
{
schemaIndexDirectory = schemaIndexProvider.getSchemaIndexStoreDirectory( storeDir );
labelIndexDirectory = labelScanStoreProvider.getStoreDirectory( storeDir );
deleteObsoleteIndexes = true;
}
}
@Override
public void moveMigratedFiles( File migrationDir, File storeDir, String versionToUpgradeFrom,
String versionToMigrateTo ) throws IOException
{
if ( deleteObsoleteIndexes )
{
deleteIndexes( schemaIndexDirectory );
deleteIndexes( labelIndexDirectory );
}
}
private void deleteIndexes( File indexRootDirectory ) throws IOException
{
fileSystem.deleteRecursively( indexRootDirectory );
}
}