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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 "mongo/base/status.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/stdx/functional.h"
namespace mongo {
namespace repl {
class ReplicationProgressManager {
public:
virtual bool prepareReplSetUpdatePositionCommand(BSONObjBuilder* cmdBuilder) = 0;
virtual ~ReplicationProgressManager();
};
class Reporter {
MONGO_DISALLOW_COPYING(Reporter);
public:
Reporter(ReplicationExecutor* executor,
ReplicationProgressManager* ReplicationProgressManager,
const HostAndPort& target);
virtual ~Reporter();
/**
* Returns true if a remote command has been scheduled (but not completed)
* with the executor.
*/
bool isActive() const;
/**
* Returns true if a remote command should be scheduled once the current one returns
* from the executor.
*/
bool willRunAgain() const;
/**
* Cancels remote command request.
* Returns immediately if the Reporter is not active.
*/
void cancel();
/**
* Waits for last/current executor handle to finish.
* Returns immediately if the handle is invalid.
*/
void wait();
/**
* Signals to the Reporter that there is new information to be sent to the "_target" server.
* Returns the _status, indicating any error the Reporter has encountered.
*/
Status trigger();
/**
* Returns the previous return status so that the owner can decide whether the Reporter
* needs a new target to whom it can report.
*/
Status getStatus() const;
private:
/**
* Schedules remote command to be run by the executor
*/
Status _schedule_inlock();
/**
* Callback for remote command.
*/
void _callback(const ReplicationExecutor::RemoteCommandCallbackData& rcbd);
// Not owned by us.
ReplicationExecutor* _executor;
ReplicationProgressManager* _updatePositionSource;
// Host to whom the Reporter sends updates.
HostAndPort _target;
// Protects member data of this Reporter.
mutable boost::mutex _mutex;
// Stores the most recent Status returned from the ReplicationExecutor.
Status _status;
// _willRunAgain is true when Reporter is scheduled to be run by the executor and subsequent
// updates have come in.
bool _willRunAgain;
// _active is true when Reporter is scheduled to be run by the executor.
bool _active;
// Callback handle to the scheduled remote command.
ReplicationExecutor::CallbackHandle _remoteCommandCallbackHandle;
};
} // namespace repl
} // namespace mongo
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