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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 <functional>
#include <memory>
#include <set>
#include <string>
#include "mongo/client/mongo_uri.h"
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/client/replica_set_monitor_interface.h"
#include "mongo/executor/task_executor.h"
#include "mongo/util/concurrency/with_lock.h"
#include "mongo/util/duration.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/time_support.h"
namespace mongo {
/**
* An abstract class, defines the external interface for static ReplicaSetMonitor methods and
* provides a means to refresh the local view.
* A ReplicaSetMonitor holds a state about the replica set and provides a means to refresh the local
* view. All methods perform the required synchronization to allow callers from multiple threads.
*/
class ReplicaSetMonitor : public ReplicaSetMonitorInterface {
public:
~ReplicaSetMonitor() override;
/**
* Creates a new ReplicaSetMonitor, if it doesn't already exist.
*/
static std::shared_ptr<ReplicaSetMonitor> createIfNeeded(const std::string& name,
const std::set<HostAndPort>& servers);
static std::shared_ptr<ReplicaSetMonitor> createIfNeeded(const MongoURI& uri);
/**
* gets a cached Monitor per name. The getter method returns nullptr if there is no monitor
* registered for the particular replica set.
*/
static std::shared_ptr<ReplicaSetMonitor> get(const std::string& name);
/**
* Removes the ReplicaSetMonitor for the given set name from ReplicaSetMonitorManager.
* Drop and remove the ReplicaSetMonitor for the given set name if it exists.
* Then all connections for this host are deleted from the connection pool DBConnectionPool.
* Those two steps are not performed atomically together, but the possible (unlikely) race:
* 1. RSM is dropped and removed
* 2. Another RSM is created for the same name
* 3. Pooled connections are cleared
* is not creating any incorrectness, it is only inefficient.
*/
static void remove(const std::string& name);
/**
* Returns the change notifier for the underlying ReplicaMonitorManager
*/
static ReplicaSetChangeNotifier& getNotifier();
/**
* Permanently stops all monitoring on replica sets and clears all cached information
* as well. As a consequence, NEVER call this if you have other threads that have a
* DBClientReplicaSet instance. This method should be used for unit test only.
*/
static void cleanup();
/**
* Permanently stops all monitoring on replica sets.
*/
static void shutdown();
protected:
explicit ReplicaSetMonitor(std::function<void()> cleanupCallback);
private:
/**
* @return callback helper to safely cleanup 'ReplicaSetMonitor' and 'globalConnPool' when the
* instance of ReplicaSetMonitor for the 'name' is being destroyed.
*/
static std::function<void()> _getCleanupCallback(StringData name);
const std::function<void()> _cleanupCallback;
};
} // namespace mongo
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