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KernelAuxTransactionStateManager.java
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KernelAuxTransactionStateManager.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.kernel.impl.api;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import org.neo4j.internal.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.txstate.aux.AuxiliaryTransactionState;
import org.neo4j.kernel.api.txstate.aux.AuxiliaryTransactionStateCloseException;
import org.neo4j.kernel.api.txstate.aux.AuxiliaryTransactionStateHolder;
import org.neo4j.kernel.api.txstate.aux.AuxiliaryTransactionStateManager;
import org.neo4j.kernel.api.txstate.aux.AuxiliaryTransactionStateProvider;
import org.neo4j.kernel.impl.util.CopyOnWriteHashMap;
import org.neo4j.storageengine.api.StorageCommand;
public class KernelAuxTransactionStateManager implements AuxiliaryTransactionStateManager
{
private volatile CopyOnWriteHashMap<Object,AuxiliaryTransactionStateProvider> providers;
public KernelAuxTransactionStateManager()
{
providers = new CopyOnWriteHashMap<>();
}
@Override
public void registerProvider( AuxiliaryTransactionStateProvider provider )
{
providers.put( provider.getIdentityKey(), provider );
}
@Override
public void unregisterProvider( AuxiliaryTransactionStateProvider provider )
{
providers.remove( provider.getIdentityKey() );
}
@Override
public AuxiliaryTransactionStateHolder openStateHolder()
{
return new AuxStateHolder( providers.snapshot() );
}
private static class AuxStateHolder implements AuxiliaryTransactionStateHolder, Function<Object,AuxiliaryTransactionState>
{
private final Map<Object,AuxiliaryTransactionStateProvider> providers;
private final Map<Object,AuxiliaryTransactionState> openedStates;
AuxStateHolder( Map<Object,AuxiliaryTransactionStateProvider> providers )
{
this.providers = providers;
openedStates = new HashMap<>();
}
@Override
public AuxiliaryTransactionState getState( Object providerIdentityKey )
{
return openedStates.computeIfAbsent( providerIdentityKey, this ); // Calls out to #apply(Object).
}
@Override
public AuxiliaryTransactionState apply( Object providerIdentityKey )
{
AuxiliaryTransactionStateProvider provider = providers.get( providerIdentityKey );
if ( provider != null )
{
return provider.createNewAuxiliaryTransactionState();
}
return null;
}
@Override
public boolean hasChanges()
{
if ( openedStates.isEmpty() )
{
return false;
}
for ( AuxiliaryTransactionState state : openedStates.values() )
{
if ( state.hasChanges() )
{
return true;
}
}
return false;
}
@Override
public void extractCommands( Collection<StorageCommand> extractedCommands ) throws TransactionFailureException
{
for ( AuxiliaryTransactionState state : openedStates.values() )
{
if ( state.hasChanges() )
{
state.extractCommands( extractedCommands );
}
}
}
@Override
public void close() throws AuxiliaryTransactionStateCloseException
{
IOUtils.close( ( msg, cause ) -> new AuxiliaryTransactionStateCloseException( "Failure when closing auxiliary transaction state.", cause ),
openedStates.values() );
}
}
}