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/* Copyright (C) 2014 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 <string>
#include "mongo/db/jsobj.h"
namespace mongo {
class Status;
struct WriteConcernOptions {
public:
enum class SyncMode { UNSET, NONE, FSYNC, JOURNAL };
static const int kNoTimeout;
static const int kNoWaiting;
static const BSONObj Default;
static const BSONObj Acknowledged;
static const BSONObj Unacknowledged;
static const BSONObj Majority;
static const StringData kWriteConcernField;
static const char kMajority[]; // = "majority"
WriteConcernOptions() {
reset();
}
WriteConcernOptions(int numNodes, SyncMode sync, int timeout);
WriteConcernOptions(int numNodes, SyncMode sync, Milliseconds timeout);
WriteConcernOptions(const std::string& mode, SyncMode sync, int timeout);
WriteConcernOptions(const std::string& mode, SyncMode sync, Milliseconds timeout);
Status parse(const BSONObj& obj);
/**
* Attempts to extract a writeConcern from cmdObj.
* Verifies that the writeConcern is of type Object (BSON type).
*/
static StatusWith<WriteConcernOptions> extractWCFromCommand(
const BSONObj& cmdObj,
const std::string& dbName,
const WriteConcernOptions& defaultWC = WriteConcernOptions());
/**
* Return true if the server needs to wait for other secondary nodes to satisfy this
* write concern setting. Errs on the false positive for non-empty wMode.
*/
bool shouldWaitForOtherNodes() const;
/**
* Returns true if this is a {w:majority} write concern, which is the only valid write concern
* to use against a config server.
*/
bool validForConfigServers() const;
void reset() {
syncMode = SyncMode::UNSET;
wNumNodes = 0;
wMode = "";
wTimeout = 0;
}
// Returns the BSON representation of this object.
// Warning: does not return the same object passed on the last parse() call.
BSONObj toBSON() const;
SyncMode syncMode;
// The w parameter for this write concern. The wMode represents the string format and
// takes precedence over the numeric format wNumNodes.
int wNumNodes;
std::string wMode;
// Timeout in milliseconds.
int wTimeout;
// True if the default write concern was used.
bool usedDefault = false;
};
} // namespace mongo
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