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/**
* Copyright (C) 2017 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 "mongo/bson/timestamp.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
/**
* The LogicalTime class holds the cluster time of the cluster. It provides conversions to
* a Timestamp to allow integration with opLog.
*/
class LogicalTime {
public:
LogicalTime() = default;
explicit LogicalTime(Timestamp ts);
/**
* Parses the 'operationTime' field of the specified object and extracts a LogicalTime from it.
* If 'operationTime' is missing or of the wrong type, throws.
*/
static LogicalTime fromOperationTime(const BSONObj& obj);
/**
* Appends "operationTime" field to the specified builder as a Timestamp type.
*/
void appendAsOperationTime(BSONObjBuilder* builder) const;
Timestamp asTimestamp() const {
return Timestamp(_time);
}
/**
* Increases the _time by ticks.
*/
void addTicks(uint64_t ticks);
/**
* Const version, returns the LogicalTime with increased _time by ticks.
*/
LogicalTime addTicks(uint64_t ticks) const;
std::string toString() const;
/**
* Returns the LogicalTime as an array of unsigned chars in little endian order for use with the
* crypto::hmacSHA1 function.
*/
std::array<unsigned char, sizeof(uint64_t)> toUnsignedArray() const;
/**
* An uninitialized value of LogicalTime. Default constructed.
*/
static const LogicalTime kUninitialized;
private:
uint64_t _time{0};
};
inline bool operator==(const LogicalTime& l, const LogicalTime& r) {
return l.asTimestamp() == r.asTimestamp();
}
inline bool operator!=(const LogicalTime& l, const LogicalTime& r) {
return !(l == r);
}
inline bool operator<(const LogicalTime& l, const LogicalTime& r) {
return l.asTimestamp() < r.asTimestamp();
}
inline bool operator<=(const LogicalTime& l, const LogicalTime& r) {
return (l < r || l == r);
}
inline bool operator>(const LogicalTime& l, const LogicalTime& r) {
return (r < l);
}
inline bool operator>=(const LogicalTime& l, const LogicalTime& r) {
return (l > r || l == r);
}
inline std::ostream& operator<<(std::ostream& s, const LogicalTime& v) {
return (s << v.toString());
}
} // namespace mongo
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