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/**
* Copyright (C) 2013 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/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/s/bson_serializable.h"
namespace mongo {
/**
* A MultiCommandDispatch is a send/recv operation for multiple commands at once.
*
* The commands are first registered with an endpoint and serializable request. Commands are
* sent out without waiting for responses, and then responses are read later one-at-a-time.
*
* If context must be tracked alongside these requests, it can be associated with the endpoint
* object.
*/
class MultiCommandDispatch {
public:
virtual ~MultiCommandDispatch() {
}
/**
* Adds a command to this multi-command dispatch. Commands are registered with a
* ConnectionString endpoint and a serializable request.
*
* Commands are not sent immediately, they are sent on sendAll.
*/
virtual void addCommand( const ConnectionString& endpoint,
StringData dbName,
const BSONSerializable& request ) = 0;
/**
* Sends all the commands in this dispatch to their endpoints, in undefined order and
* without waiting for responses. May block on full send queue (though this should be
* rare).
*
* Any error which occurs during sendAll will be reported on recvAny, *does not throw.*
*/
virtual void sendAll() = 0;
/**
* Returns the number of sent requests that are still waiting to be recv'd.
*/
virtual int numPending() const = 0;
/**
* Blocks until a command response has come back. Any outstanding command response may be
* returned with associated endpoint.
*
* Returns !OK on send/recv/parse failure, otherwise command-level errors are returned in
* the response object itself.
*/
virtual Status recvAny( ConnectionString* endpoint, BSONSerializable* response ) = 0;
};
}
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