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/**
* Copyright (C) 2017 MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 <map>
#include "mongo/base/status_with.h"
#include "mongo/db/keys_collection_document.h"
#include "mongo/db/operation_context.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class KeysCollectionClient;
/**
* Keeps a local cache of the keys with the ability to refresh.
*
* Note: This assumes that user does not manually update the keys collection.
*/
class KeysCollectionCache {
public:
KeysCollectionCache(std::string purpose, KeysCollectionClient* client);
~KeysCollectionCache() = default;
/**
* Check if there are new documents expiresAt > latestKeyDoc.expiresAt.
*/
StatusWith<KeysCollectionDocument> refresh(OperationContext* opCtx);
StatusWith<KeysCollectionDocument> getKey(const LogicalTime& forThisTime);
StatusWith<KeysCollectionDocument> getKeyById(long long keyId, const LogicalTime& forThisTime);
/**
* Resets the cache of keys if the client doesnt allow readConcern level:majority reads.
* This method intended to be called on the rollback of the node.
*/
void resetCache();
private:
const std::string _purpose;
KeysCollectionClient* const _client;
stdx::mutex _cacheMutex;
std::map<LogicalTime, KeysCollectionDocument> _cache; // expiresAt -> KeysDocument
};
} // namespace mongo
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