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ThreadToStatementContextBridge.java
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ThreadToStatementContextBridge.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 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.core;
import java.util.Optional;
import java.util.function.Supplier;
import org.neo4j.graphdb.DatabaseShutdownException;
import org.neo4j.graphdb.NotInTransactionException;
import org.neo4j.graphdb.TransactionTerminatedException;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
/**
* This is meant to serve as the bridge that makes the Beans API tie transactions to threads. The Beans API
* will use this to get the appropriate {@link Statement} when it performs operations.
*/
public class ThreadToStatementContextBridge extends LifecycleAdapter implements Supplier<Statement>
{
private final ThreadLocal<KernelTransaction> threadToTransactionMap = new ThreadLocal<>();
private boolean isShutdown;
public boolean hasTransaction()
{
checkIfShutdown();
return threadToTransactionMap.get() != null;
}
public void bindTransactionToCurrentThread( KernelTransaction transaction )
{
if ( threadToTransactionMap.get() != null )
{
throw new IllegalStateException( Thread.currentThread() + " already has a transaction bound" );
}
threadToTransactionMap.set( transaction );
}
public void unbindTransactionFromCurrentThread()
{
threadToTransactionMap.remove();
}
@Override
public Statement get()
{
checkIfShutdown();
return getKernelTransactionBoundToThisThread( true ).acquireStatement();
}
private void assertInUnterminatedTransaction( KernelTransaction transaction )
{
if ( transaction == null )
{
throw new BridgeNotInTransactionException();
}
Optional<Status> terminationReason = transaction.getReasonIfTerminated();
if ( terminationReason.isPresent() )
{
throw new TransactionTerminatedException( terminationReason.get() );
}
}
public void assertInUnterminatedTransaction()
{
checkIfShutdown();
assertInUnterminatedTransaction( threadToTransactionMap.get() );
}
@Override
public void shutdown() throws Throwable
{
isShutdown = true;
}
private void checkIfShutdown()
{
if ( isShutdown )
{
throw new BridgeDatabaseShutdownException();
}
}
public KernelTransaction getTopLevelTransactionBoundToThisThread( boolean strict )
{
KernelTransaction transaction = threadToTransactionMap.get();
if ( strict )
{
assertInUnterminatedTransaction( transaction );
}
return transaction;
}
public KernelTransaction getKernelTransactionBoundToThisThread( boolean strict )
{
checkIfShutdown();
return getTopLevelTransactionBoundToThisThread( strict );
}
// Exeptions below extend the public API exceptions with versions that have status codes.
private static class BridgeNotInTransactionException extends NotInTransactionException implements Status.HasStatus
{
@Override
public Status status()
{
return Status.Request.TransactionRequired;
}
}
private static class BridgeDatabaseShutdownException extends DatabaseShutdownException implements Status.HasStatus
{
@Override
public Status status()
{
return Status.General.DatabaseUnavailable;
}
}
}