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// @file dur.h durability support
#pragma once
#include "../util/concurrency/mutex.h"
#include "../util/file.h"
namespace mongo {
class MemoryMappedFile;
namespace dur {
struct ParsedJournalEntry;
/** call go() to execute a recovery from existing journal files.
*/
class RecoveryJob : boost::noncopyable {
public:
RecoveryJob() :_lastDataSyncedFromLastRun(0), _mx("recovery") {}
void go(vector<path>& files);
~RecoveryJob();
void processSection(const void *, unsigned len, bool doDurOps);
void close(); // locks and calls _close()
static RecoveryJob & get() { return _instance; }
private:
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
/** retrieve the File for the specified dbName plus file number.
open if not yet open.
@param fileNo a value of -1 indicates ".ns"
@param ofs offset to add to the pointer before returning
*/
File& getFile(const char *dbName, int fileNo);
// fileno,dbname -> File
// all close at end (destruction) of RecoveryJob
typedef map< pair<int,string>, File > FileMap;
FileMap _files;
unsigned long long _lastDataSyncedFromLastRun;
mongo::mutex _mx; // protects _files
static RecoveryJob _instance;
};
}
}
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