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TransactionIdTracker.java
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TransactionIdTracker.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.internal;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import static org.neo4j.function.Predicates.tryAwait;
import static org.neo4j.kernel.impl.transaction.log.TransactionIdStore.BASE_TX_ID;
class TransactionIdTracker implements VersionTracker
{
private final Supplier<TransactionIdStore> transactionIdStore;
private final int timeout;
private final TimeUnit timeoutUnit;
private long txId;
TransactionIdTracker( Supplier<TransactionIdStore> transactionIdStore, long transactionId, int timeout,
TimeUnit unit )
{
this.transactionIdStore = transactionIdStore;
this.txId = transactionId;
this.timeout = timeout;
this.timeoutUnit = unit;
}
@Override
public void assertUpToDate() throws TransactionFailureException
{
if ( txId <= BASE_TX_ID )
{
return;
}
try
{
if ( !tryAwait( () -> txId <= transactionIdStore.get().getLastClosedTransactionId(), timeout, timeoutUnit,
25, TimeUnit.MILLISECONDS ) )
{
throw new TransactionFailureException( Status.Transaction.InstanceStateChanged,
"Database not up to the requested version: %d. Latest database version is %d", txId,
transactionIdStore.get().getLastClosedTransactionId() );
}
}
catch ( InterruptedException e )
{
throw new TransactionFailureException( Status.Transaction.TransactionStartFailed, e,
"Thread interrupted when starting transaction" );
}
}
@Override
public void updateVersion( long version )
{
if ( txId < 0 )
{
return;
}
this.txId = version <= BASE_TX_ID ? transactionIdStore.get().getLastClosedTransactionId() : version;
}
}