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NeoStoreTransactionApplier.java
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NeoStoreTransactionApplier.java
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/*
* Copyright (c) 2002-2015 "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.transaction.command;
import java.io.IOException;
import org.neo4j.kernel.impl.api.CommandVisitor;
import org.neo4j.kernel.impl.api.TransactionApplier;
import org.neo4j.kernel.impl.core.CacheAccessBackDoor;
import org.neo4j.kernel.impl.locking.LockGroup;
import org.neo4j.kernel.impl.locking.LockService;
import org.neo4j.kernel.impl.store.NeoStores;
import org.neo4j.kernel.impl.store.SchemaStore;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import org.neo4j.kernel.impl.store.record.PropertyConstraintRule;
/**
* Visits commands targeted towards the {@link NeoStores} and update corresponding stores.
* What happens in here is what will happen in a "internal" transaction, i.e. a transaction that has been
* forged in this database, with transaction state, a KernelTransaction and all that and is now committing.
* <p>
* For other modes of application, like recovery or external there are other, added functionality, decorated
* outside this applier.
*/
public class NeoStoreTransactionApplier extends TransactionApplier.Adapter
{
private final LockGroup lockGroup;
private final long transactionId;
private final NeoStores neoStores;
private final CacheAccessBackDoor cacheAccess;
private LockService lockService;
public NeoStoreTransactionApplier( NeoStores neoStores, CacheAccessBackDoor cacheAccess, LockService lockService,
long transactionId, LockGroup lockGroup )
{
this.lockGroup = lockGroup;
this.transactionId = transactionId;
this.lockService = lockService;
this.neoStores = neoStores;
this.cacheAccess = cacheAccess;
}
@Override
public void close() throws Exception
{
lockGroup.close();
}
@Override
public boolean visitNodeCommand( Command.NodeCommand command ) throws IOException
{
// acquire lock
lockGroup.add( lockService.acquireNodeLock( command.getKey(), LockService.LockType.WRITE_LOCK ) );
// update store
neoStores.getNodeStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitRelationshipCommand( Command.RelationshipCommand command ) throws IOException
{
lockGroup.add( lockService.acquireRelationshipLock( command.getKey(), LockService.LockType.WRITE_LOCK ) );
neoStores.getRelationshipStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitPropertyCommand( Command.PropertyCommand command ) throws IOException
{
// acquire lock
if ( command.getNodeId() != -1 )
{
lockGroup.add( lockService.acquireNodeLock( command.getNodeId(), LockService.LockType.WRITE_LOCK ) );
}
else if ( command.getRelId() != -1 )
{
lockGroup.add( lockService.acquireRelationshipLock( command.getRelId(), LockService.LockType.WRITE_LOCK ) );
}
// track the dynamic value record high ids
// update store
neoStores.getPropertyStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitRelationshipGroupCommand( Command.RelationshipGroupCommand command ) throws IOException
{
neoStores.getRelationshipGroupStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitRelationshipTypeTokenCommand( Command.RelationshipTypeTokenCommand command ) throws IOException
{
neoStores.getRelationshipTypeTokenStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitLabelTokenCommand( Command.LabelTokenCommand command ) throws IOException
{
neoStores.getLabelTokenStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitPropertyKeyTokenCommand( Command.PropertyKeyTokenCommand command ) throws IOException
{
neoStores.getPropertyKeyTokenStore().updateRecord( command.getAfter() );
return false;
}
@Override
public boolean visitSchemaRuleCommand( Command.SchemaRuleCommand command ) throws IOException
{
// schema rules. Execute these after generating the property updates so. If executed
// before and we've got a transaction that sets properties/labels as well as creating an index
// we might end up with this corner-case:
// 1) index rule created and index population job started
// 2) index population job processes some nodes, but doesn't complete
// 3) we gather up property updates and send those to the indexes. The newly created population
// job might get those as updates
// 4) the population job will apply those updates as added properties, and might end up with duplicate
// entries for the same property
SchemaStore schemaStore = neoStores.getSchemaStore();
for ( DynamicRecord record : command.getRecordsAfter() )
{
schemaStore.updateRecord( record );
}
if ( command.getSchemaRule() instanceof PropertyConstraintRule )
{
switch ( command.getMode() )
{
case UPDATE:
case CREATE:
neoStores.getMetaDataStore().setLatestConstraintIntroducingTx( transactionId );
break;
case DELETE:
break;
default:
throw new IllegalStateException( command.getMode().name() );
}
}
switch ( command.getMode() )
{
case DELETE:
cacheAccess.removeSchemaRuleFromCache( command.getKey() );
break;
default:
cacheAccess.addSchemaRule( command.getSchemaRule() );
}
return false;
}
@Override
public boolean visitNeoStoreCommand( Command.NeoStoreCommand command ) throws IOException
{
neoStores.getMetaDataStore().setGraphNextProp( command.getAfter().getNextProp() );
return false;
}
}