/**
 *    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 <memory>
#include <vector>

#include "mongo/db/storage/recovery_unit.h"

namespace mongo {

class OperationContext;

class RecoveryUnitNoop : public RecoveryUnit {
public:
    void beginUnitOfWork(OperationContext* opCtx) final {}
    void commitUnitOfWork() final {
        for (auto& change : _changes) {
            try {
                change->commit();
            } catch (...) {
                std::terminate();
            }
        }
        _changes.clear();
    }
    void abortUnitOfWork() final {
        for (auto it = _changes.rbegin(); it != _changes.rend(); ++it) {
            try {
                (*it)->rollback();
            } catch (...) {
                std::terminate();
            }
        }
        _changes.clear();
    }

    virtual void abandonSnapshot() {}

    virtual bool waitUntilDurable() {
        return true;
    }

    virtual void registerChange(Change* change) {
        _changes.push_back(std::unique_ptr<Change>(change));
    }

    virtual void* writingPtr(void* data, size_t len) {
        return data;
    }
    virtual void setRollbackWritesDisabled() {}

    virtual SnapshotId getSnapshotId() const {
        return SnapshotId();
    }

private:
    std::vector<std::unique_ptr<Change>> _changes;
};

}  // namespace mongo