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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 <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/bson/oid.h"
#include "mongo/db/repl/repl_set_config.h"
#include "mongo/db/repl/scatter_gather_algorithm.h"
#include "mongo/executor/task_executor.h"
namespace mongo {
class Status;
namespace repl {
class ReplSetConfig;
class ScatterGatherRunner;
class ElectCmdRunner {
MONGO_DISALLOW_COPYING(ElectCmdRunner);
public:
class Algorithm : public ScatterGatherAlgorithm {
public:
Algorithm(const ReplSetConfig& rsConfig,
int selfIndex,
const std::vector<HostAndPort>& targets,
OID round);
virtual ~Algorithm();
virtual std::vector<executor::RemoteCommandRequest> getRequests() const;
virtual void processResponse(const executor::RemoteCommandRequest& request,
const executor::RemoteCommandResponse& response);
virtual bool hasReceivedSufficientResponses() const;
int getReceivedVotes() const {
return _receivedVotes;
}
private:
// Tally of the number of received votes for this election.
int _receivedVotes;
// Number of responses received so far.
size_t _actualResponses;
bool _sufficientResponsesReceived;
const ReplSetConfig _rsConfig;
const int _selfIndex;
const std::vector<HostAndPort> _targets;
const OID _round;
};
ElectCmdRunner();
~ElectCmdRunner();
/**
* Begins the process of sending replSetElect commands to all non-DOWN nodes
* in currentConfig.
*
* Returned handle can be used to schedule a callback when the process is complete.
*/
StatusWith<executor::TaskExecutor::EventHandle> start(executor::TaskExecutor* executor,
const ReplSetConfig& currentConfig,
int selfIndex,
const std::vector<HostAndPort>& targets);
/**
* Informs the ElectCmdRunner to cancel further processing.
*/
void cancel();
/**
* Returns the number of received votes. Only valid to call after
* the event handle returned from start() has been signaled, which guarantees that
* the vote count will no longer be touched by callbacks.
*/
int getReceivedVotes() const;
/**
* Returns true if cancel() was called on this instance.
*/
bool isCanceled() const {
return _isCanceled;
}
private:
std::shared_ptr<Algorithm> _algorithm;
std::unique_ptr<ScatterGatherRunner> _runner;
bool _isCanceled;
};
}
}
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