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// @file dur.h durability support
#pragma once
#include "dur_journalformat.h"
#include "../util/concurrency/mutex.h"
#include "../util/file.h"
namespace mongo {
class MongoMMF;
namespace dur {
struct ParsedJournalEntry;
/** call go() to execute a recovery from existing journal files.
*/
class RecoveryJob : boost::noncopyable {
public:
RecoveryJob() : _lastDataSyncedFromLastRun(0),
_mx("recovery"), _recovering(false) { _lastSeqMentionedInConsoleLog = 1; }
void go(vector<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(const ParsedJournalEntry& entry); // actually writes to the file
void applyEntry(const ParsedJournalEntry& entry, bool apply, bool dump);
void applyEntries(const vector<ParsedJournalEntry> &entries);
bool processFileBuffer(const void *, unsigned len);
bool processFile(path journalfile);
void _close(); // doesn't lock
list<boost::shared_ptr<MongoMMF> > _mmfs;
unsigned long long _lastDataSyncedFromLastRun;
unsigned long long _lastSeqMentionedInConsoleLog;
public:
mongo::mutex _mx; // protects _mmfs; see setNoJournal() too
private:
bool _recovering; // are we in recovery or WRITETODATAFILES
static RecoveryJob &_instance;
};
}
}
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