write_concern.h

/*    Copyright 2014 MongoDB Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#pragma once

#include <bitset>
#include <string>

#include "mongo/client/export_macros.h"
#include "mongo/db/jsobj.h"

namespace mongo {

class MONGO_CLIENT_API WriteConcern {
public:
    WriteConcern();

    static const char kMajority[];

    //
    // Standard write concern levels as defined in the MongoDB manual:
    // http://docs.mongodb.org/manual/core/write-concern/
    //

    static const WriteConcern unacknowledged;

    static const WriteConcern acknowledged;

    static const WriteConcern journaled;

    static const WriteConcern replicated;

    static const WriteConcern majority;

    int32_t nodes() const;

    const std::string& mode() const;

    bool journal() const;

    bool fsync() const;

    int32_t timeout() const;

    WriteConcern& nodes(int w);

    WriteConcern& mode(const StringData& w);

    WriteConcern& journal(bool j);

    WriteConcern& fsync(bool fsync);

    WriteConcern& timeout(int timeout);

    bool requiresConfirmation() const;

    bool hasMode() const;

    BSONObj obj() const;

private:
    // Enabled option book keeping
    static const size_t kNumOptions = 5;
    enum Options { kW, kWStr, kJ, kFsync, kTimeout };
    std::bitset<kNumOptions> _enabled;

    // Actual option values
    int32_t _w;
    std::string _w_str;
    bool _j;
    bool _fsync;
    int32_t _timeout;
};

}  // namespace mongo