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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/stdx/variant.h"
#include <string>
#include <vector>
#include "mongo/db/namespace_string.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/mutex.h"
#include "mongo/util/uuid.h"
/**
* Caches the set of collections containing a TTL index.
* This class is thread safe.
*/
namespace mongo {
class TTLCollectionCache {
public:
static TTLCollectionCache& get(ServiceContext* ctx);
// Specifies that a collection is clustered by _id and is TTL.
class ClusteredId : public stdx::monostate {};
// Names an index that is TTL.
using IndexName = std::string;
// Specifies how a collection should expire data with TTL.
using Info = stdx::variant<ClusteredId, IndexName>;
// Caller is responsible for ensuring no duplicates are registered.
void registerTTLInfo(UUID uuid, const Info& info);
void deregisterTTLInfo(UUID uuid, const Info& info);
using InfoMap = stdx::unordered_map<UUID, std::vector<Info>, UUID::Hash>;
InfoMap getTTLInfos();
private:
Mutex _ttlInfosLock = MONGO_MAKE_LATCH("TTLCollectionCache::_ttlInfosLock");
InfoMap _ttlInfos;
};
} // namespace mongo
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