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// @file dur.h durability support
/**
* Copyright (C) 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <boost/filesystem/operations.hpp>
#include <list>
#include "mongo/db/dur_journalformat.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/file.h"
namespace mongo {
class DurableMappedFile;
namespace dur {
struct ParsedJournalEntry;
/** call go() to execute a recovery from existing journal files.
*/
class RecoveryJob : boost::noncopyable {
static class Last {
public:
Last();
DurableMappedFile* newEntry(const ParsedJournalEntry&, RecoveryJob&);
private:
DurableMappedFile *mmf;
string dbName;
int fileNo;
} last;
public:
RecoveryJob() : _lastDataSyncedFromLastRun(0),
_mx("recovery"), _recovering(false) { _lastSeqMentionedInConsoleLog = 1; }
void go(vector<boost::filesystem::path>& files);
~RecoveryJob();
/** @param data data between header and footer. compressed if recovering. */
void processSection(const JSectHeader *h, const void *data, unsigned len, const JSectFooter *f);
void close(); // locks and calls _close()
static RecoveryJob & get() { return _instance; }
private:
void write(Last& last, const ParsedJournalEntry& entry); // actually writes to the file
void applyEntry(Last& last, const ParsedJournalEntry& entry, bool apply, bool dump);
void applyEntries(const vector<ParsedJournalEntry> &entries);
bool processFileBuffer(const void *, unsigned len);
bool processFile(boost::filesystem::path journalfile);
void _close(); // doesn't lock
DurableMappedFile* getDurableMappedFile(const ParsedJournalEntry& entry);
list<boost::shared_ptr<DurableMappedFile> > _mmfs;
unsigned long long _lastDataSyncedFromLastRun;
unsigned long long _lastSeqMentionedInConsoleLog;
public:
mongo::mutex _mx; // protects _mmfs
private:
bool _recovering; // are we in recovery or WRITETODATAFILES
static RecoveryJob &_instance;
};
}
}
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