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/**
* Copyright (C) 2019-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/db/catalog/collection_catalog.h"
#include "mongo/db/concurrency/lock_manager_defs.h"
#include "mongo/db/operation_context.h"
namespace mongo {
class Collection;
class CollectionPtr;
class CollectionCatalogEntry;
namespace catalog {
/**
* Returns ErrorCodes::NamespaceExists if a collection or any type of views exists on the given
* namespace 'nss'. Otherwise returns Status::OK().
*
* Note: If the caller calls this method without locking the collection, then the returned result
* could be stale right after this call.
*/
Status checkIfNamespaceExists(OperationContext* opCtx, const NamespaceString& nss);
/**
* Iterates through all the collections in the given database and runs the callback function on each
* collection. If a predicate is provided, then the callback will only be executed against the
* collections that satisfy the predicate.
*
* Additionally, no collection lock is held while checking the outcome of the predicate. The
* predicate must not block, as an internal collection catalog mutex is held during its evaluation.
* The collection lock is acquired when executing the callback only on the satisfying collections.
*
* Iterating through the remaining collections stops when the callback returns false.
*/
void forEachCollectionFromDb(OperationContext* opCtx,
const DatabaseName& dbName,
LockMode collLockMode,
CollectionCatalog::CollectionInfoFn callback,
CollectionCatalog::CollectionInfoFn predicate = nullptr);
} // namespace catalog
} // namespace mongo
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