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DefaultRecoveryService.java
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DefaultRecoveryService.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.recovery;
import java.io.IOException;
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.LogicalTransactionStore;
import org.neo4j.kernel.impl.transaction.log.TransactionCursor;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryCommit;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryStart;
import org.neo4j.storageengine.api.StorageEngine;
import org.neo4j.storageengine.api.TransactionApplicationMode;
import static org.neo4j.kernel.impl.transaction.log.Commitment.NO_COMMITMENT;
public class DefaultRecoveryService implements RecoveryService
{
private final PositionToRecoverFrom positionToRecoverFrom;
private final StorageEngine storageEngine;
private final TransactionIdStore transactionIdStore;
private final LogicalTransactionStore logicalTransactionStore;
public DefaultRecoveryService( StorageEngine storageEngine, LogTailScanner logTailScanner,
TransactionIdStore transactionIdStore, LogicalTransactionStore logicalTransactionStore,
PositionToRecoverFrom.Monitor monitor )
{
this.storageEngine = storageEngine;
this.transactionIdStore = transactionIdStore;
this.logicalTransactionStore = logicalTransactionStore;
this.positionToRecoverFrom = new PositionToRecoverFrom( logTailScanner, monitor );
}
@Override
public LogPosition getPositionToRecoverFrom() throws IOException
{
return positionToRecoverFrom.get();
}
@Override
public void startRecovery()
{
// Calling this method means that recovery is required, tell storage engine about it
// This method will be called before recovery actually starts and so will ensure that
// each store is aware that recovery will be performed. At this point all the stores have
// already started btw.
// Go and read more at {@link CommonAbstractStore#deleteIdGenerator()}
storageEngine.prepareForRecoveryRequired();
}
@Override
public RecoveryApplier getRecoveryApplier( TransactionApplicationMode mode ) throws Exception
{
return new RecoveryVisitor( new TransactionQueue( 100, ( first, last ) -> storageEngine.apply( first, mode ) ) );
}
@Override
public TransactionCursor getTransactions( LogPosition position ) throws IOException
{
return logicalTransactionStore.getTransactions( position );
}
@Override
public TransactionCursor getTransactionsInReverseOrder( LogPosition position ) throws IOException
{
return logicalTransactionStore.getTransactionsInReverseOrder( position );
}
@Override
public void transactionsRecovered( CommittedTransactionRepresentation lastRecoveredTransaction,
LogPosition positionAfterLastRecoveredTransaction )
{
long recoveredTransactionLogVersion = positionAfterLastRecoveredTransaction.getLogVersion();
long recoveredTransactionOffset = positionAfterLastRecoveredTransaction.getByteOffset();
if ( lastRecoveredTransaction != null )
{
LogEntryCommit commitEntry = lastRecoveredTransaction.getCommitEntry();
transactionIdStore.setLastCommittedAndClosedTransactionId(
commitEntry.getTxId(),
LogEntryStart.checksum( lastRecoveredTransaction.getStartEntry() ),
commitEntry.getTimeWritten(),
recoveredTransactionOffset,
recoveredTransactionLogVersion );
}
}
static class RecoveryVisitor implements RecoveryApplier
{
private final TransactionQueue transactionsToApply;
RecoveryVisitor( TransactionQueue transactionsToApply )
{
this.transactionsToApply = transactionsToApply;
}
@Override
public boolean visit( CommittedTransactionRepresentation transaction ) throws Exception
{
TransactionRepresentation txRepresentation = transaction.getTransactionRepresentation();
long txId = transaction.getCommitEntry().getTxId();
TransactionToApply tx = new TransactionToApply( txRepresentation, txId );
tx.commitment( NO_COMMITMENT, txId );
tx.logPosition( transaction.getStartEntry().getStartPosition() );
transactionsToApply.queue( tx );
return false;
}
@Override
public void close() throws Exception
{
transactionsToApply.empty();
}
}
}