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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 "mongo/s/config_server_catalog_cache_loader.h"
namespace mongo {
/**
* Contains a ConfigServerCatalogCacheLoader for remote metadata loading. Inactive functions simply
* return, rather than invariant, so this class can be plugged into the shard server for read-only
* mode, where persistence should not be attempted.
*/
class ReadOnlyCatalogCacheLoader final : public CatalogCacheLoader {
public:
void initializeReplicaSetRole(bool isPrimary) override {}
void onStepDown() override {}
void onStepUp() override {}
void notifyOfCollectionVersionUpdate(const NamespaceString& nss) override {}
void waitForCollectionFlush(OperationContext* opCtx, const NamespaceString& nss) override;
void waitForDatabaseFlush(OperationContext* opCtx, StringData dbName) override;
std::shared_ptr<Notification<void>> getChunksSince(
const NamespaceString& nss,
ChunkVersion version,
GetChunksSinceCallbackFn callbackFn) override;
void getDatabase(
StringData dbName,
stdx::function<void(OperationContext*, StatusWith<DatabaseType>)> callbackFn) override;
private:
ConfigServerCatalogCacheLoader _configServerLoader;
};
} // namespace mongo
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