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/* Copyright (C) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
This program 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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "Engine.h"
#include "BackLog.h"
#include "Database.h"
#include "TableSpaceManager.h"
#include "Dbb.h"
#include "Section.h"
#include "Index.h"
#include "IndexRootPage.h"
#include "Transaction.h"
#include "Serialize.h"
#include "RecordVersion.h"
#include "Bitmap.h"
#include "Format.h"
#include "Table.h"
#include "Log.h"
#ifdef _DEBUG
#undef THIS_FILE
static const char THIS_FILE[]=__FILE__;
#endif
BackLog::BackLog(Database *db, const char *fileName) : database(db)
{
dbb = new Dbb(database->dbb, 0);
#ifndef FALCONDB
dbb->createPath(fileName);
#endif
dbb->create(fileName, dbb->pageSize, 0, HdrTableSpace, 0, NULL);
dbb->noLog = true;
dbb->tableSpaceId = TABLESPACE_ID_BACKLOG; // reserved for internal use
int32 sectionId = Section::createSection (dbb, NO_TRANSACTION);
section = new Section(dbb, sectionId, NO_TRANSACTION);
recordsBacklogged = 0;
recordsReconstituted = 0;
priorBacklogged = 0;
priorReconstituted = 0;
}
BackLog::~BackLog(void)
{
delete section;
delete dbb;
}
int32 BackLog::save(RecordVersion* record)
{
// Write the record and entire prior version chain
// into a single backlog record
Serialize stream;
record->serialize(&stream);
int32 backlogId = section->insertStub(NO_TRANSACTION);
section->updateRecord(backlogId, &stream, NO_TRANSACTION, false);
++recordsBacklogged;
return backlogId + 1;
}
RecordVersion* BackLog::fetch(int32 backlogId)
{
Serialize stream;
section->fetchRecord(backlogId - 1, &stream, NO_TRANSACTION);
RecordVersion *record = new RecordVersion(database, &stream);
++recordsReconstituted;
return record;
}
void BackLog::deleteRecord(int32 backlogId)
{
section->expungeRecord(backlogId - 1);
}
void BackLog::update(int32 backlogId, RecordVersion* record)
{
Serialize stream;
record->serialize(&stream);
section->updateRecord(backlogId - 1, &stream, NO_TRANSACTION, false);
}
void BackLog::rollbackRecords(Bitmap* records, Transaction *transaction)
{
for (int backlogId = 0; (backlogId = records->nextSet(backlogId)) >= 0; ++backlogId)
{
RecordVersion *record = fetch(backlogId);
if (record->getTransactionId() != transaction->transactionId)
{
record->release(REC_HISTORY);
continue;
}
Table *table = record->format->table;
if (!table->insertIntoTree(record, NULL, record->recordNumber))
{
record->release(REC_HISTORY);
int32 recordNumber = record->recordNumber;
Record *rec = table->fetch(recordNumber);
if (rec)
{
if (rec->getTransactionId() == transaction->transactionId)
record->rollback(transaction);
else
record->release(REC_HISTORY);
}
continue;
}
record->rollback(transaction);
SET_RECORD_ACTIVE(record, false);
record->release(REC_HISTORY);
}
}
void BackLog::reportStatistics(void)
{
if (recordsBacklogged == priorBacklogged && recordsReconstituted == priorReconstituted)
return;
int deltaBacklogged = recordsBacklogged - priorBacklogged;
int deltaReconstituted = recordsReconstituted = priorReconstituted;
priorBacklogged = recordsBacklogged;
priorReconstituted = recordsReconstituted;
Log::log (LogInfo, "%d: Backlog: %d records backlogged, %d records reconstituted\n",
database->deltaTime, deltaBacklogged, deltaReconstituted);
}
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