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RecoveryVisitor.java
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RecoveryVisitor.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.kernel.impl.transaction.state;
import org.neo4j.helpers.collection.CloseableVisitor;
import org.neo4j.kernel.impl.api.TransactionQueue;
import org.neo4j.kernel.impl.api.TransactionToApply;
import org.neo4j.kernel.impl.transaction.CommittedTransactionRepresentation;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.LogPosition;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryStart;
import org.neo4j.storageengine.api.StorageEngine;
import static org.neo4j.kernel.impl.transaction.log.Commitment.NO_COMMITMENT;
import static org.neo4j.storageengine.api.TransactionApplicationMode.RECOVERY;
public class RecoveryVisitor implements CloseableVisitor<RecoverableTransaction,Exception>
{
public interface Monitor
{
void transactionRecovered( long txId );
}
private final TransactionIdStore store;
private final StorageEngine storageEngine;
private final Monitor monitor;
private long lastTransactionIdApplied = -1;
private long lastTransactionCommitTimestamp;
private long lastTransactionChecksum;
private LogPosition lastTransactionLogPosition;
private final TransactionQueue queue = new TransactionQueue( 10_000, this::applyQueue );
public RecoveryVisitor( TransactionIdStore store,
StorageEngine storageEngine,
Monitor monitor )
{
this.store = store;
this.storageEngine = storageEngine;
this.monitor = monitor;
}
@Override
public boolean visit( RecoverableTransaction transaction ) throws Exception
{
CommittedTransactionRepresentation representation = transaction.representation();
long txId = representation.getCommitEntry().getTxId();
TransactionRepresentation txRepresentation = representation.getTransactionRepresentation();
queue( txRepresentation, txId );
lastTransactionIdApplied = txId;
lastTransactionCommitTimestamp = transaction.representation().getCommitEntry().getTimeWritten();
lastTransactionChecksum = LogEntryStart.checksum( representation.getStartEntry() );
lastTransactionLogPosition = transaction.positionAfterTx();
monitor.transactionRecovered( txId );
return false;
}
private void queue( TransactionRepresentation txRepresentation, long txId ) throws Exception
{
TransactionToApply tx = new TransactionToApply( txRepresentation, txId );
tx.commitment( NO_COMMITMENT, txId );
queue.queue( tx );
}
private void applyQueue( TransactionToApply batch, TransactionToApply last ) throws Exception
{
storageEngine.apply( batch, RECOVERY );
}
@Override
public void close() throws Exception
{
queue.empty();
if ( lastTransactionIdApplied != -1 )
{
store.setLastCommittedAndClosedTransactionId( lastTransactionIdApplied, lastTransactionChecksum,
lastTransactionCommitTimestamp, lastTransactionLogPosition.getByteOffset(),
lastTransactionLogPosition.getLogVersion() );
}
}
}