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LocalDatabase.java
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LocalDatabase.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 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.causalclustering.catchup.storecopy;
import java.io.File;
import java.io.IOException;
import java.util.function.Supplier;
import org.neo4j.causalclustering.identity.StoreId;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.AvailabilityGuard;
import org.neo4j.kernel.AvailabilityGuard.AvailabilityRequirement;
import org.neo4j.kernel.NeoStoreDataSource;
import org.neo4j.kernel.impl.api.TransactionCommitProcess;
import org.neo4j.kernel.impl.api.TransactionRepresentationCommitProcess;
import org.neo4j.kernel.impl.store.MetaDataStore;
import org.neo4j.kernel.impl.store.StoreType;
import org.neo4j.kernel.impl.storemigration.StoreFile;
import org.neo4j.kernel.impl.transaction.log.TransactionAppender;
import org.neo4j.kernel.impl.transaction.state.DataSourceManager;
import org.neo4j.kernel.internal.DatabaseHealth;
import org.neo4j.kernel.lifecycle.Lifecycle;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import org.neo4j.storageengine.api.StorageEngine;
import static org.neo4j.kernel.AvailabilityGuard.availabilityRequirement;
public class LocalDatabase implements Lifecycle
{
private static final AvailabilityRequirement NOT_STOPPED =
availabilityRequirement( "Database is stopped" );
private static final AvailabilityRequirement NOT_COPYING_STORE =
availabilityRequirement( "Database is stopped to copy store from another cluster member" );
private final File storeDir;
private final StoreFiles storeFiles;
private final DataSourceManager dataSourceManager;
private final PageCache pageCache;
private final FileSystemAbstraction fileSystemAbstraction;
private final Supplier<DatabaseHealth> databaseHealthSupplier;
private final AvailabilityGuard availabilityGuard;
private final Log log;
private volatile StoreId storeId;
private volatile DatabaseHealth databaseHealth;
private volatile AvailabilityRequirement currentRequirement;
private volatile TransactionCommitProcess localCommit;
public LocalDatabase( File storeDir, StoreFiles storeFiles,
DataSourceManager dataSourceManager,
PageCache pageCache, FileSystemAbstraction fileSystemAbstraction,
Supplier<DatabaseHealth> databaseHealthSupplier, AvailabilityGuard availabilityGuard,
LogProvider logProvider )
{
this.storeDir = storeDir;
this.storeFiles = storeFiles;
this.dataSourceManager = dataSourceManager;
this.pageCache = pageCache;
this.fileSystemAbstraction = fileSystemAbstraction;
this.databaseHealthSupplier = databaseHealthSupplier;
this.availabilityGuard = availabilityGuard;
this.log = logProvider.getLog( getClass() );
raiseAvailabilityGuard( NOT_STOPPED );
}
@Override
public void init() throws Throwable
{
dataSourceManager.init();
}
@Override
public synchronized void start() throws Throwable
{
storeId = readStoreIdFromDisk();
log.info( "Starting with storeId: " + storeId );
dataSourceManager.start();
dropAvailabilityGuard();
}
@Override
public void stop() throws Throwable
{
stopWithRequirement( NOT_STOPPED );
}
/**
* Stop database to perform a store copy. This will raise {@link AvailabilityGuard} with
* a more friendly blocking requirement.
*
* @throws Throwable if any of the components are unable to stop.
*/
public void stopForStoreCopy() throws Throwable
{
stopWithRequirement( NOT_COPYING_STORE );
}
public boolean isAvailable()
{
return currentRequirement == null;
}
@Override
public void shutdown() throws Throwable
{
dataSourceManager.shutdown();
}
public synchronized StoreId storeId()
{
if ( isAvailable() )
{
return storeId;
}
else
{
return readStoreIdFromDisk();
}
}
private StoreId readStoreIdFromDisk()
{
try
{
File neoStoreFile = new File( storeDir, MetaDataStore.DEFAULT_NAME );
org.neo4j.kernel.impl.store.StoreId kernelStoreId = MetaDataStore.getStoreId( pageCache, neoStoreFile );
return new StoreId( kernelStoreId.getCreationTime(), kernelStoreId.getRandomId(),
kernelStoreId.getUpgradeTime(), kernelStoreId.getUpgradeId() );
}
catch ( IOException e )
{
log.error( "Failure reading store id", e );
return null;
}
}
public void panic( Throwable cause )
{
getDatabaseHealth().panic( cause );
}
public <EXCEPTION extends Throwable> void assertHealthy( Class<EXCEPTION> cause ) throws EXCEPTION
{
getDatabaseHealth().assertHealthy( cause );
}
private DatabaseHealth getDatabaseHealth()
{
if ( databaseHealth == null )
{
databaseHealth = databaseHealthSupplier.get();
}
return databaseHealth;
}
public void delete() throws IOException
{
storeFiles.delete( storeDir );
}
public boolean isEmpty() throws IOException
{
return !hasStoreFiles();
}
private boolean hasStoreFiles()
{
for ( StoreType storeType : StoreType.values() )
{
StoreFile storeFile = storeType.getStoreFile();
if(storeFile != null)
{
boolean exists = fileSystemAbstraction.fileExists( new File( storeDir, storeFile.storeFileName() ) );
if ( exists )
{
return true;
}
}
}
return false;
}
public File storeDir()
{
return storeDir;
}
void replaceWith( File sourceDir ) throws IOException
{
storeFiles.delete( storeDir );
storeFiles.moveTo( sourceDir, storeDir );
}
public NeoStoreDataSource dataSource()
{
return dataSourceManager.getDataSource();
}
/**
* Called by the DataSourceManager during start.
*/
public void registerCommitProcessDependencies( TransactionAppender appender, StorageEngine applier )
{
localCommit = new TransactionRepresentationCommitProcess( appender, applier );
}
public TransactionCommitProcess getCommitProcess()
{
return localCommit;
}
private synchronized void stopWithRequirement( AvailabilityRequirement requirement ) throws Throwable
{
log.info( "Stopping, reason: " + requirement.description() );
raiseAvailabilityGuard( requirement );
databaseHealth = null;
localCommit = null;
dataSourceManager.stop();
}
private void raiseAvailabilityGuard( AvailabilityRequirement requirement )
{
// it is possible for the local database to be created and stopped right after that to perform a store copy
// in this case we need to impose new requirement and drop the old one
availabilityGuard.require( requirement );
if ( currentRequirement != null )
{
dropAvailabilityGuard();
}
currentRequirement = requirement;
}
private void dropAvailabilityGuard()
{
availabilityGuard.fulfill( currentRequirement );
currentRequirement = null;
}
}