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KernelData.java
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KernelData.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;
import java.io.File;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.neo4j.graphdb.config.Setting;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
/**
* @deprecated This will be moved to internal packages in the next major release.
*/
@Deprecated
public abstract class KernelData
{
public static final Setting<String> forced_id = GraphDatabaseSettings.forced_kernel_id;
private static final Map<String, KernelData> instances = new ConcurrentHashMap<String, KernelData>();
private static synchronized String newInstance( KernelData instance )
{
String instanceId = instance.configuration.get( forced_id );
if ( instanceId == null || instanceId.equals( "" ) )
{
for ( int i = 0; i < instances.size() + 1; i++ )
{
instanceId = Integer.toString( i );
if ( !instances.containsKey( instanceId ) )
{
break;
}
}
}
if ( instances.containsKey( instanceId ) )
{
throw new IllegalStateException(
"There is already a kernel started with " + forced_id.name() + "='" + instanceId + "'." );
}
instances.put( instanceId, instance );
return instanceId;
}
private static synchronized void removeInstance( String instanceId )
{
if (instances.remove( instanceId ) == null)
throw new IllegalArgumentException( "No kernel found with instance id "+instanceId );
}
private final String instanceId;
private final PageCache pageCache;
private final FileSystemAbstraction fs;
private final File storeDir;
private final Config configuration;
protected KernelData( FileSystemAbstraction fs, PageCache pageCache, File storeDir, Config configuration )
{
this.pageCache = pageCache;
this.fs = fs;
this.storeDir = storeDir;
this.configuration = configuration;
this.instanceId = newInstance( this );
}
public final String instanceId()
{
return instanceId;
}
@Override
public final int hashCode()
{
return instanceId.hashCode();
}
@Override
public final boolean equals( Object obj )
{
return obj instanceof KernelData && instanceId.equals( ((KernelData) obj).instanceId );
}
public abstract Version version();
public File getStoreDir()
{
return storeDir;
}
public Config getConfig()
{
return configuration;
}
public PageCache getPageCache()
{
return pageCache;
}
public FileSystemAbstraction getFilesystemAbstraction()
{
return fs;
}
public abstract GraphDatabaseAPI graphDatabase();
public void shutdown()
{
removeInstance( instanceId );
}
}