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TransactionStateMachineSPI.java
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TransactionStateMachineSPI.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.bolt.v1.runtime;
import java.time.Clock;
import java.time.Duration;
import java.util.Map;
import org.neo4j.bolt.v1.runtime.TransactionStateMachine.BoltResultHandle;
import org.neo4j.bolt.v1.runtime.cypher.CypherAdapterStream;
import org.neo4j.bolt.v1.runtime.spi.BoltResult;
import org.neo4j.graphdb.Result;
import org.neo4j.kernel.GraphDatabaseQueryService;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.exceptions.KernelException;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.security.AuthSubject;
import org.neo4j.kernel.api.txtracking.TransactionIdTracker;
import org.neo4j.kernel.impl.core.ThreadToStatementContextBridge;
import org.neo4j.kernel.impl.coreapi.InternalTransaction;
import org.neo4j.kernel.impl.coreapi.PropertyContainerLocker;
import org.neo4j.kernel.impl.query.Neo4jTransactionalContextFactory;
import org.neo4j.kernel.impl.query.QueryExecutionEngine;
import org.neo4j.kernel.impl.query.QueryExecutionKernelException;
import org.neo4j.kernel.impl.query.QuerySource;
import org.neo4j.kernel.impl.query.TransactionalContext;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import static org.neo4j.kernel.api.KernelTransaction.Type.implicit;
class TransactionStateMachineSPI implements TransactionStateMachine.SPI
{
private final GraphDatabaseAPI db;
private final ThreadToStatementContextBridge txBridge;
private final QueryExecutionEngine queryExecutionEngine;
private final TransactionIdTracker transactionIdTracker;
private static final PropertyContainerLocker locker = new PropertyContainerLocker();
private final Neo4jTransactionalContextFactory contextFactory;
private final GraphDatabaseQueryService queryService;
private final Clock clock;
TransactionStateMachineSPI( GraphDatabaseAPI db,
ThreadToStatementContextBridge txBridge,
QueryExecutionEngine queryExecutionEngine,
TransactionIdStore transactionIdStoreSupplier,
GraphDatabaseQueryService queryService,
Clock clock )
{
this.db = db;
this.txBridge = txBridge;
this.queryExecutionEngine = queryExecutionEngine;
this.transactionIdTracker = new TransactionIdTracker( transactionIdStoreSupplier );
this.contextFactory = new Neo4jTransactionalContextFactory( queryService, locker );
this.queryService = queryService;
this.clock = clock;
}
@Override
public void awaitUpToDate( long oldestAcceptableTxId, Duration timeout ) throws TransactionFailureException
{
transactionIdTracker.awaitUpToDate( oldestAcceptableTxId, timeout );
}
@Override
public long newestEncounteredTxId()
{
return transactionIdTracker.newestEncounteredTxId();
}
@Override
public KernelTransaction beginTransaction( AuthSubject authSubject )
{
db.beginTransaction( KernelTransaction.Type.explicit, authSubject );
return txBridge.getKernelTransactionBoundToThisThread( false );
}
@Override
public void bindTransactionToCurrentThread( KernelTransaction tx )
{
txBridge.bindTransactionToCurrentThread( tx );
}
@Override
public void unbindTransactionFromCurrentThread()
{
txBridge.unbindTransactionFromCurrentThread();
}
@Override
public boolean isPeriodicCommit( String query )
{
return queryExecutionEngine.isPeriodicCommit( query );
}
@Override
public BoltResultHandle executeQuery( String querySource,
AuthSubject authSubject,
String statement,
Map<String,Object> params ) throws QueryExecutionKernelException
{
InternalTransaction transaction = queryService.beginTransaction( implicit, authSubject );
QuerySource sourceDetails = new QuerySource( "bolt-session", querySource );
TransactionalContext transactionalContext =
contextFactory.newContext( sourceDetails, transaction, statement, params );
return new BoltResultHandle()
{
@Override
public BoltResult start() throws QueryExecutionKernelException
{
try
{
Result run = queryExecutionEngine.executeQuery( statement, params, transactionalContext );
return new CypherAdapterStream( run, clock );
}
catch ( KernelException e )
{
throw new QueryExecutionKernelException( e );
}
}
@Override
public void terminate()
{
transactionalContext.terminate();
}
};
}
}