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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 "mongo/client/dbclientinterface.h"
#include "mongo/db/dbmessage.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
class OperationContext;
/**
* Embedded calls to the local server using the DBClientBase API without going over the network.
*
* Caller does not need to lock, that is handled within.
*
* All operations are performed within the scope of a passed-in OperationContext (except when
* using the deprecated constructor). You must ensure that the OperationContext is valid when
* calling into any function. If you ever need to change the OperationContext, that can be done
* without the overhead of creating a new DBDirectClient by calling setOpCtx(), after which all
* operations will use the new OperationContext.
*/
class DBDirectClient : public DBClientBase {
public:
static const HostAndPort dummyHost;
DBDirectClient(OperationContext* txn);
using DBClientBase::query;
// XXX: is this valid or useful?
void setOpCtx(OperationContext* txn);
virtual std::unique_ptr<DBClientCursor> query(const std::string &ns,
Query query,
int nToReturn = 0,
int nToSkip = 0,
const BSONObj* fieldsToReturn = 0,
int queryOptions = 0,
int batchSize = 0);
virtual bool isFailed() const;
virtual bool isStillConnected();
virtual std::string toString() const;
virtual std::string getServerAddress() const;
virtual bool call(Message& toSend,
Message& response,
bool assertOk = true,
std::string* actualServer = 0);
virtual void say(Message& toSend,
bool isRetry = false,
std::string* actualServer = 0);
virtual void sayPiggyBack(Message& toSend);
virtual void killCursor(long long cursorID);
virtual bool callRead(Message& toSend, Message& response);
virtual unsigned long long count(const std::string &ns,
const BSONObj& query = BSONObj(),
int options = 0,
int limit = 0,
int skip = 0);
virtual ConnectionString::ConnectionType type() const;
double getSoTimeout() const;
virtual bool lazySupported() const;
virtual QueryOptions _lookupAvailableOptions();
private:
OperationContext* _txn;
};
} // namespace mongo
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