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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 <string>
#include <vector>
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/executor/task_executor.h"
#include "mongo/platform/mutex.h"
#include "mongo/util/string_map.h"
namespace mongo {
class BSONObjBuilder;
class ConnectionString;
class ReplicaSetMonitor;
class MongoURI;
/**
* Manages the lifetime of a set of replica set monitors.
*/
class ReplicaSetMonitorManager {
ReplicaSetMonitorManager(const ReplicaSetMonitorManager&) = delete;
ReplicaSetMonitorManager& operator=(const ReplicaSetMonitorManager&) = delete;
public:
ReplicaSetMonitorManager();
~ReplicaSetMonitorManager();
/**
* Create or retrieve a monitor for a particular replica set. The getter method returns
* nullptr if there is no monitor registered for the particular replica set.
*/
std::shared_ptr<ReplicaSetMonitor> getMonitor(StringData setName);
std::shared_ptr<ReplicaSetMonitor> getOrCreateMonitor(const ConnectionString& connStr);
std::shared_ptr<ReplicaSetMonitor> getOrCreateMonitor(const MongoURI& uri);
/**
* Retrieves the names of all sets tracked by this manager.
*/
std::vector<std::string> getAllSetNames();
/**
* Removes the specified replica set monitor from being tracked, if it exists. Otherwise
* does nothing. Once all shared_ptr references to that monitor are released, the monitor
* will be destroyed and will no longer be tracked.
*/
void removeMonitor(StringData setName);
/**
* Removes and destroys all replica set monitors. Should be used for unit tests only.
*/
void removeAllMonitors();
/**
* Shuts down _taskExecutor.
*/
void shutdown();
/**
* Reports information about the replica sets tracked by us, for diagnostic purposes. If
* forFTDC, trim to minimize its size for full-time diagnostic data capture.
*/
void report(BSONObjBuilder* builder, bool forFTDC = false);
/**
* Returns an executor for running RSM tasks.
*/
executor::TaskExecutor* getExecutor();
ReplicaSetChangeNotifier& getNotifier();
bool isShutdown() const;
private:
using ReplicaSetMonitorsMap = StringMap<std::weak_ptr<ReplicaSetMonitor>>;
// Protects access to the replica set monitors
mutable Mutex _mutex = MONGO_MAKE_LATCH("ReplicaSetMonitorManager::_mutex");
// Executor for monitoring replica sets.
std::unique_ptr<executor::TaskExecutor> _taskExecutor;
// Widget to notify listeners when a RSM notices a change
ReplicaSetChangeNotifier _notifier;
// Needs to be after `_taskExecutor`, so that it will be destroyed before the `_taskExecutor`.
ReplicaSetMonitorsMap _monitors;
void _setupTaskExecutorInLock();
// set to true when shutdown has been called.
bool _isShutdown{false};
};
} // namespace mongo
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