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LogEntryStart.java
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LogEntryStart.java
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/*
* Copyright (c) 2002-2015 "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.entry;
import java.util.Arrays;
import java.util.TimeZone;
import org.neo4j.helpers.Format;
import org.neo4j.kernel.impl.transaction.log.LogPosition;
import static org.neo4j.kernel.impl.transaction.log.entry.LogEntryByteCodes.TX_START;
import static org.neo4j.kernel.impl.transaction.log.entry.LogEntryVersion.CURRENT;
public class LogEntryStart extends AbstractLogEntry
{
public static final byte[] EMPTY_ADDITIONAL_ARRAY = new byte[]{};
private final int masterId;
private final int authorId;
private final long timeWritten;
private final long lastCommittedTxWhenTransactionStarted;
private final byte[] additionalHeader;
private LogPosition startPosition;
public LogEntryStart( int masterId, int authorId, long timeWritten,
long lastCommittedTxWhenTransactionStarted, byte[] additionalHeader,
LogPosition startPosition )
{
this( CURRENT, masterId, authorId, timeWritten,
lastCommittedTxWhenTransactionStarted, additionalHeader, startPosition );
}
public LogEntryStart( LogEntryVersion version, int masterId, int authorId, long timeWritten,
long lastCommittedTxWhenTransactionStarted, byte[] additionalHeader, LogPosition startPosition )
{
super( version, TX_START );
this.masterId = masterId;
this.authorId = authorId;
this.startPosition = startPosition;
this.timeWritten = timeWritten;
this.lastCommittedTxWhenTransactionStarted = lastCommittedTxWhenTransactionStarted;
this.additionalHeader = additionalHeader;
}
public int getMasterId()
{
return masterId;
}
public int getLocalId()
{
return authorId;
}
public LogPosition getStartPosition()
{
return startPosition;
}
public void setStartPosition( LogPosition position )
{
this.startPosition = position;
}
public long getTimeWritten()
{
return timeWritten;
}
public long getLastCommittedTxWhenTransactionStarted()
{
return lastCommittedTxWhenTransactionStarted;
}
public byte[] getAdditionalHeader()
{
return additionalHeader;
}
/**
* @return combines necessary state to get a unique checksum to identify this transaction uniquely.
*/
public static long checksum( byte[] additionalHeader, int masterId, int authorId )
{
// [4 bits combined masterId/myId][4 bits xid hashcode, which combines time/randomness]
long lowBits = Arrays.hashCode( additionalHeader );
long highBits = masterId*37 + authorId;
return (highBits << 32) | (lowBits & 0xFFFFFFFFL);
}
public static long checksum( LogEntryStart entry )
{
return checksum( entry.additionalHeader, entry.masterId, entry.authorId );
}
public long checksum()
{
return checksum( this );
}
@Override
public String toString()
{
return toString( Format.DEFAULT_TIME_ZONE );
}
@Override
public String toString( TimeZone timeZone )
{
return "Start[" +
"master=" + masterId + "," +
"me=" + authorId + "," +
"time=" + timestamp( timeWritten, timeZone ) + "," +
"lastCommittedTxWhenTransactionStarted=" + lastCommittedTxWhenTransactionStarted + "," +
"additionalHeaderLength=" + (additionalHeader == null ? -1 : additionalHeader.length) + "," +
(additionalHeader == null ? "" : Arrays.toString( additionalHeader ) ) + "," +
"position=" + startPosition + "," +
"checksum=" + checksum( this ) +
"]";
}
@Override
public <T extends LogEntry> T as()
{
return (T) this;
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
LogEntryStart start = (LogEntryStart) o;
return authorId == start.authorId &&
lastCommittedTxWhenTransactionStarted == start.lastCommittedTxWhenTransactionStarted &&
masterId == start.masterId && timeWritten == start.timeWritten &&
Arrays.equals( additionalHeader, start.additionalHeader ) && startPosition.equals( start.startPosition );
}
@Override
public int hashCode()
{
int result = masterId;
result = 31 * result + authorId;
result = 31 * result + (int) (timeWritten ^ (timeWritten >>> 32));
result = 31 * result + (int) (lastCommittedTxWhenTransactionStarted ^ (lastCommittedTxWhenTransactionStarted >>> 32));
result = 31 * result + (additionalHeader != null ? Arrays.hashCode( additionalHeader ) : 0);
result = 31 * result + startPosition.hashCode();
return result;
}
}