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Recovery.java
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Recovery.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 org.neo4j.kernel.impl.core.StartupStatisticsProvider;
import org.neo4j.kernel.impl.transaction.CommittedTransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.LogPosition;
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.lifecycle.LifecycleAdapter;
import static org.neo4j.storageengine.api.TransactionApplicationMode.RECOVERY;
import static org.neo4j.storageengine.api.TransactionApplicationMode.REVERSE_RECOVERY;
/**
* This is the process of doing a recovery on the transaction log and store, and is executed
* at startup of {@link org.neo4j.kernel.NeoStoreDataSource}.
*/
public class Recovery extends LifecycleAdapter
{
private final RecoveryService recoveryService;
private final RecoveryMonitor monitor;
private final StartupStatisticsProvider startupStatistics;
private final TransactionLogPruner logPruner;
private int numberOfRecoveredTransactions;
public Recovery( RecoveryService recoveryService, StartupStatisticsProvider startupStatistics,
TransactionLogPruner logPruner, RecoveryMonitor monitor )
{
this.recoveryService = recoveryService;
this.monitor = monitor;
this.startupStatistics = startupStatistics;
this.logPruner = logPruner;
}
@Override
public void init() throws Throwable
{
LogPosition recoveryFromPosition = recoveryService.getPositionToRecoverFrom();
if ( LogPosition.UNSPECIFIED.equals( recoveryFromPosition ) )
{
return;
}
monitor.recoveryRequired( recoveryFromPosition );
recoveryService.startRecovery();
LogPosition recoveryToPosition = recoveryFromPosition;
CommittedTransactionRepresentation lastTransaction = null;
CommittedTransactionRepresentation lastReversedTransaction = null;
try
{
long lowestRecoveredTxId = TransactionIdStore.BASE_TX_ID;
try ( TransactionCursor transactionsToRecover = recoveryService.getTransactionsInReverseOrder( recoveryFromPosition );
RecoveryApplier recoveryVisitor = recoveryService.getRecoveryApplier( REVERSE_RECOVERY ) )
{
while ( transactionsToRecover.next() )
{
CommittedTransactionRepresentation transaction = transactionsToRecover.get();
if ( lastReversedTransaction == null )
{
lastReversedTransaction = transaction;
}
recoveryVisitor.visit( transaction );
lowestRecoveredTxId = transaction.getCommitEntry().getTxId();
}
}
monitor.reverseStoreRecoveryCompleted( lowestRecoveredTxId );
try ( TransactionCursor transactionsToRecover = recoveryService.getTransactions( recoveryFromPosition );
RecoveryApplier recoveryVisitor = recoveryService.getRecoveryApplier( RECOVERY ) )
{
while ( transactionsToRecover.next() )
{
lastTransaction = transactionsToRecover.get();
long txId = lastTransaction.getCommitEntry().getTxId();
recoveryVisitor.visit( lastTransaction );
monitor.transactionRecovered( txId );
numberOfRecoveredTransactions++;
recoveryToPosition = transactionsToRecover.position();
}
}
}
catch ( Exception e )
{
if ( lastTransaction != null )
{
LogEntryCommit commitEntry = lastTransaction.getCommitEntry();
monitor.failToRecoverTransactionsAfterCommit( e, commitEntry, recoveryToPosition );
}
else
{
monitor.failToRecoverTransactionsAfterPosition( e, recoveryFromPosition );
recoveryToPosition = recoveryFromPosition;
}
}
logPruner.prune( recoveryToPosition );
recoveryService.transactionsRecovered( lastTransaction, recoveryToPosition );
startupStatistics.setNumberOfRecoveredTransactions( numberOfRecoveredTransactions );
monitor.recoveryCompleted( numberOfRecoveredTransactions );
}
}