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StoreLockChecker.java
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StoreLockChecker.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.commandline.dbms;
import java.io.Closeable;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import org.neo4j.io.IOUtils;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.layout.StoreLayout;
import org.neo4j.kernel.StoreLockException;
import org.neo4j.kernel.internal.locker.GlobalStoreLocker;
import org.neo4j.kernel.internal.locker.StoreLocker;
class StoreLockChecker implements Closeable
{
private final FileSystemAbstraction fileSystem;
private final StoreLocker storeLocker;
private StoreLockChecker( FileSystemAbstraction fileSystem, StoreLayout storeLayout )
{
this.fileSystem = fileSystem;
this.storeLocker = new GlobalStoreLocker( fileSystem, storeLayout );
}
/**
* Create store lock checker with lock on a provided store layout if it exists and writable
* @param storeLayout store layout to check
* @return lock checker or empty closeable in case if path does not exists or is not writable
* @throws CannotWriteException
*
* @see StoreLocker
* @see Files
*/
static Closeable check( StoreLayout storeLayout ) throws CannotWriteException
{
Path lockFile = storeLayout.storeLockFile().toPath();
if ( Files.exists( lockFile ) )
{
if ( Files.isWritable( lockFile ) )
{
StoreLockChecker storeLocker = new StoreLockChecker( new DefaultFileSystemAbstraction(), storeLayout );
try
{
storeLocker.checkLock();
return storeLocker;
}
catch ( StoreLockException le )
{
try
{
storeLocker.close();
}
catch ( IOException e )
{
le.addSuppressed( e );
}
throw le;
}
}
else
{
throw new CannotWriteException( lockFile );
}
}
return () ->
{
};
}
private void checkLock()
{
storeLocker.checkLock();
}
@Override
public void close() throws IOException
{
IOUtils.closeAll( storeLocker, fileSystem );
}
}