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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/disallow_copying.h"
#include "mongo/db/concurrency/deferred_writer.h"
#include "mongo/db/service_context.h"
namespace mongo {
class HealthLogEntry;
/**
* The interface to the local healthlog.
*
* This class contains facilities for creating and asynchronously writing to the local healthlog
* collection. There should only be one instance of this class, initialized on startup and cleaned
* up on shutdown.
*/
class HealthLog {
MONGO_DISALLOW_COPYING(HealthLog);
public:
/**
* Required to use HealthLog as a ServiceContext decorator.
*
* Should not be used anywhere else.
*/
HealthLog();
/**
* The maximum size of the in-memory buffer of health-log entries, in bytes.
*/
static const int64_t kMaxBufferSize = 25'000'000;
/**
* Start the worker thread writing the buffer to the collection.
*/
void startup(void);
/**
* Stop the worker thread.
*/
void shutdown(void);
/**
* The name of the collection.
*/
static const NamespaceString nss;
/**
* Get the current context's HealthLog.
*/
static HealthLog& get(ServiceContext* ctx);
static HealthLog& get(OperationContext* ctx);
/**
* Asynchronously insert the given entry.
*
* Return `false` iff there is no more space in the buffer.
*/
bool log(const HealthLogEntry& entry);
private:
DeferredWriter _writer;
};
}
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