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/**
* Copyright (C) 2023-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 <boost/filesystem/operations.hpp>
#include "mongo/db/service_context.h"
#include "mongo/util/periodic_runner.h"
namespace mongo {
/**
* The DiskSpaceMonitor is a periodic job that observes at the remaining disk space for the database
* and takes action based on its observations.
*/
class DiskSpaceMonitor final {
public:
static void start(ServiceContext* svcCtx);
static void stop(ServiceContext* svcCtx);
static DiskSpaceMonitor* get(ServiceContext* svcCtx);
/**
* An Action defines a function that should be called when the available disk space falls below
* a specified threshold.
*/
struct Action {
virtual ~Action() {}
/**
* If the disk space in bytes falls below this threshold, the act() function should be
* called.
*/
virtual int64_t getThresholdBytes() noexcept = 0;
/**
* Takes action when the defined threshold is reached. This function may be called an
* indefinite number of times when the disk falls below its threshold.
*/
virtual void act(OperationContext* opCtx, int64_t availableBytes) noexcept = 0;
};
/**
* Register an action that responds to changes in disk space.
*/
void registerAction(std::unique_ptr<Action> action);
/**
* Immediately take action based on the provided available disk space in bytes.
*/
void takeAction(OperationContext* opCtx, int64_t availableBytes);
private:
void _start(ServiceContext* svcCtx);
void _stop();
void _run(Client*);
PeriodicJobAnchor _job;
// This mutex protects _actions and the entire run loop of the disk space monitor.
Mutex _mutex = MONGO_MAKE_LATCH("DiskSpaceMonitor::_mutex");
std::vector<std::unique_ptr<Action>> _actions;
};
} // namespace mongo
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