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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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_coordinator.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/condition_variable.h"
namespace mongo {
struct HostAndPort;
class OperationContext;
namespace executor {
class TaskExecutor;
} // namespace executor
namespace repl {
class BackgroundSync;
class Reporter;
class SyncSourceFeedback {
SyncSourceFeedback(const SyncSourceFeedback&) = delete;
SyncSourceFeedback& operator=(const SyncSourceFeedback&) = delete;
public:
SyncSourceFeedback() = default;
/// Notifies the SyncSourceFeedbackThread to wake up and send an update upstream of secondary
/// replication progress.
void forwardSecondaryProgress();
/**
* Loops continuously until shutdown() is called, passing updates when they are present. If no
* update occurs within the _keepAliveInterval, progress is forwarded to let the upstream node
* know that this node, along with the alive nodes chaining through it, are still alive.
*
* Task executor is used to run replSetUpdatePosition command on sync source.
*/
void run(executor::TaskExecutor* executor,
BackgroundSync* bgsync,
ReplicationCoordinator* replCoord);
/// Signals the run() method to terminate.
void shutdown();
private:
/* Inform the sync target of our current position in the oplog, as well as the positions
* of all secondaries chained through us.
*/
Status _updateUpstream(Reporter* reporter);
// protects cond, _shutdownSignaled, _keepAliveInterval, and _positionChanged.
Mutex _mtx = MONGO_MAKE_LATCH("SyncSourceFeedback::_mtx");
// used to alert our thread of changes which need to be passed up the chain
stdx::condition_variable _cond;
// used to indicate a position change which has not yet been pushed along
bool _positionChanged = false;
// Once this is set to true the _run method will terminate
bool _shutdownSignaled = false;
// Reports replication progress to sync source.
Reporter* _reporter = nullptr;
};
} // namespace repl
} // namespace mongo
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