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/**
* Copyright (C) 2015 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 "mongo/base/disallow_copying.h"
#include "mongo/rpc/protocol.h"
namespace mongo {
class Message;
class BSONObj;
class StringData;
namespace rpc {
class DocumentRange;
/**
* Constructs an RPC request.
*/
class RequestBuilderInterface {
MONGO_DISALLOW_COPYING(RequestBuilderInterface);
public:
/**
* Request builders must have their fields set in order as they are immediately written into
* the underlying message buffer. This enum represents the next field that can be written
* into the builder. Note that when the builder is in state 'kInputDocs', multiple input
* docs can be added. After the builder's done() method is called it is in state 'kDone',
* and no further methods can be called.
*/
enum class State {
kDatabase,
kCommandName,
kMetadata,
kCommandArgs,
kInputDocs,
kDone
};
virtual ~RequestBuilderInterface() = default;
/**
* Sets the database that the command will be executed against.
*/
virtual RequestBuilderInterface& setDatabase(StringData database) = 0;
/**
* Sets the name of the command to execute.
*/
virtual RequestBuilderInterface& setCommandName(StringData commandName) = 0;
/**
* Sets the metadata associated with this command request - see metadata.h for details.
*/
virtual RequestBuilderInterface& setMetadata(BSONObj metadata) = 0;
/**
* Sets the arguments to pass to the command.
*/
virtual RequestBuilderInterface& setCommandArgs(BSONObj commandArgs) = 0;
/**
* Add a range of input documents to the request. This method can be called multiple times
* before calling done().
*/
virtual RequestBuilderInterface& addInputDocs(DocumentRange inputDocs) = 0;
/**
* Add a single output document to the request. This method can be called multiple times
* before calling done().
*/
virtual RequestBuilderInterface& addInputDoc(BSONObj inputDoc) = 0;
/**
* Get the state of the builder. This method is intended to enable debug or invariant
* checks that the builder is in the correct state.
*/
virtual State getState() const = 0;
/**
* Gets the protocol used to serialize this request. This should only be used for asserts,
* and not for runtime behavior changes, which should be handled with polymorphism.
*/
virtual Protocol getProtocol() const = 0;
/**
* Writes data then transfers ownership of the message to the caller.
* The behavior of calling any methods on the object is subsequently
* undefined.
*/
virtual std::unique_ptr<Message> done() = 0;
protected:
RequestBuilderInterface() = default;
};
} // namespace rpc
} // namespace mongo
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