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/**
* Copyright (C) 2015 MongoDB 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <tuple>
#include "mongo/bson/timestamp.h"
namespace mongo {
namespace repl {
/**
* OpTime encompasses a Timestamp (which itself is composed of two 32-bit integers, which can
* represent a time_t and a counter), and a 64-bit Term number. OpTime can be used to
* label every op in an oplog with a unique identifier.
*/
class OpTime {
public:
// The default term after the first time upgrading from protocol version 0.
//
// This is also the first term for nodes that were recently started up but have not
// yet joined the cluster, all in protocol version 1.
static const long long kDefaultTerm = 0;
OpTime() = default;
OpTime(Timestamp ts, long long term);
Timestamp getTimestamp() const;
long long getSecs() const;
long long getTerm() const;
std::string toString() const;
// Returns true when this OpTime is not yet initialized.
bool isNull() const;
inline bool operator==(const OpTime& rhs) const {
return std::tie(_term, _timestamp) == std::tie(rhs._term, rhs._timestamp);
}
inline bool operator<(const OpTime& rhs) const {
// Compare term first, then the opTimes.
return std::tie(_term, _timestamp) < std::tie(rhs._term, rhs._timestamp);
}
inline bool operator!=(const OpTime& rhs) const {
return !(*this == rhs);
}
inline bool operator<=(const OpTime& rhs) const {
return *this < rhs || *this == rhs;
}
inline bool operator>(const OpTime& rhs) const {
return !(*this <= rhs);
}
inline bool operator>=(const OpTime& rhs) const {
return !(*this < rhs);
}
friend std::ostream& operator<<(std::ostream& out, const OpTime& opTime);
private:
Timestamp _timestamp;
long long _term = kDefaultTerm;
};
} // namespace repl
} // namespace mongo
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