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PhysicalLogFileInformation.java
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PhysicalLogFileInformation.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.log;
import java.io.IOException;
public class PhysicalLogFileInformation implements LogFileInformation
{
public interface LogVersionToTimestamp
{
long getTimestampForVersion( long version ) throws IOException;
}
private final PhysicalLogFiles logFiles;
private final LogHeaderCache logHeaderCache;
private final TransactionIdStore transactionIdStore;
private final LogVersionToTimestamp logVersionToTimestamp;
public PhysicalLogFileInformation( PhysicalLogFiles logFiles,
LogHeaderCache logHeaderCache,
TransactionIdStore transactionIdStore,
LogVersionToTimestamp logVersionToTimestamp )
{
this.logFiles = logFiles;
this.logHeaderCache = logHeaderCache;
this.transactionIdStore = transactionIdStore;
this.logVersionToTimestamp = logVersionToTimestamp;
}
@Override
public long getFirstExistingTxId() throws IOException
{
long version = logFiles.getHighestLogVersion();
long candidateFirstTx = -1;
while ( logFiles.versionExists( version ) )
{
candidateFirstTx = getFirstCommittedTxId( version );
version--;
}
version++; // the loop above goes back one version too far.
// OK, so we now have the oldest existing log version here. Open it and see if there's any transaction
// in there. If there is then that transaction is the first one that we have.
return logFiles.hasAnyTransaction( version ) ? candidateFirstTx : -1;
}
@Override
public long getFirstCommittedTxId( long version ) throws IOException
{
long logHeader = logHeaderCache.getLogHeader( version );
if ( logHeader != -1 )
{ // It existed in cache
return logHeader + 1;
}
// Wasn't cached, go look for it
if ( logFiles.versionExists( version ) )
{
long previousVersionLastCommittedTx = logFiles.extractHeader( version ).lastCommittedTxId;
logHeaderCache.putHeader( version, previousVersionLastCommittedTx );
return previousVersionLastCommittedTx + 1;
}
return -1;
}
@Override
public long getLastCommittedTxId()
{
return transactionIdStore.getLastCommittedTransactionId();
}
@Override
public long getFirstStartRecordTimestamp( long version ) throws IOException
{
return logVersionToTimestamp.getTimestampForVersion( version );
}
}