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/**
* Copyright (C) 2016 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 <string>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/namespace_string.h"
#include "mongo/stdx/functional.h"
namespace mongo {
class BSONObj;
class Database;
class OperationContext;
/**
* Interface for system.views collection operations associated with view catalog management.
* All methods must be called from within a WriteUnitOfWork, and with the DBLock held in at
* least intent mode.
*/
class DurableViewCatalog {
public:
static constexpr StringData viewsCollectionName() {
return NamespaceString::kSystemDotViewsCollectionName;
}
/**
* Thread-safe method to mark a catalog name was changed. This will cause the in-memory
* view catalog to be marked invalid
*/
static void onExternalChange(OperationContext* txn, const NamespaceString& name);
using Callback = stdx::function<Status(const BSONObj& view)>;
virtual Status iterate(OperationContext* txn, Callback callback) = 0;
virtual void upsert(OperationContext* txn,
const NamespaceString& name,
const BSONObj& view) = 0;
virtual void remove(OperationContext* txn, const NamespaceString& name) = 0;
virtual const std::string& getName() const = 0;
};
/**
* Actual implementation of DurableViewCatalog for use by the Database class.
* Implements durability through database operations on the system.views collection.
*/
class DurableViewCatalogImpl final : public DurableViewCatalog {
public:
explicit DurableViewCatalogImpl(Database* db) : _db(db) {}
Status iterate(OperationContext* txn, Callback callback);
void upsert(OperationContext* txn, const NamespaceString& name, const BSONObj& view);
void remove(OperationContext* txn, const NamespaceString& name);
const std::string& getName() const;
private:
Database* const _db;
};
} // namespace mongo
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