mirror of https://gitee.com/bigwinds/arangodb
176 lines
6.6 KiB
C++
176 lines
6.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief collection usage guard
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_UTILS_COLLECTION_GUARD_H
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#define ARANGODB_UTILS_COLLECTION_GUARD_H 1
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#include "Basics/Common.h"
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#include "Basics/Exceptions.h"
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#include "VocBase/vocbase.h"
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namespace triagens {
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namespace arango {
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// -----------------------------------------------------------------------------
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// --SECTION-- class CollectionGuard
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// -----------------------------------------------------------------------------
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class CollectionGuard {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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CollectionGuard (CollectionGuard const&) = delete;
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CollectionGuard& operator= (CollectionGuard const&) = delete;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the guard, using a collection id
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////////////////////////////////////////////////////////////////////////////////
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CollectionGuard (TRI_vocbase_t* vocbase,
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TRI_voc_cid_t id,
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bool restoreOriginalStatus = false)
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: _vocbase(vocbase),
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_collection(nullptr),
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_originalStatus(TRI_VOC_COL_STATUS_CORRUPTED),
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_restoreOriginalStatus(restoreOriginalStatus) {
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_collection = TRI_UseCollectionByIdVocBase(_vocbase, id, _originalStatus);
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if (_collection == nullptr) {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the guard, using a collection name
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////////////////////////////////////////////////////////////////////////////////
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CollectionGuard (TRI_vocbase_t* vocbase,
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char const* name,
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bool restoreOriginalStatus = false)
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: _vocbase(vocbase),
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_collection(nullptr),
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_originalStatus(TRI_VOC_COL_STATUS_CORRUPTED),
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_restoreOriginalStatus(restoreOriginalStatus) {
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_collection = TRI_UseCollectionByNameVocBase(_vocbase, name, _originalStatus);
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if (_collection == nullptr) {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the guard
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////////////////////////////////////////////////////////////////////////////////
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~CollectionGuard () {
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if (_collection != nullptr) {
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TRI_ReleaseCollectionVocBase(_vocbase, _collection);
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if (_restoreOriginalStatus &&
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(_originalStatus == TRI_VOC_COL_STATUS_UNLOADING ||
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_originalStatus == TRI_VOC_COL_STATUS_UNLOADED)) {
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// re-unload the collection
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TRI_UnloadCollectionVocBase(_vocbase, _collection, false);
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}
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the collection pointer
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////////////////////////////////////////////////////////////////////////////////
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inline TRI_vocbase_col_t* collection () const {
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return _collection;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the status of the collection at the time of using the guard
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////////////////////////////////////////////////////////////////////////////////
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inline TRI_vocbase_col_status_e originalStatus () const {
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return _originalStatus;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pointer to vocbase
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////////////////////////////////////////////////////////////////////////////////
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TRI_vocbase_t* _vocbase;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pointer to collection
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////////////////////////////////////////////////////////////////////////////////
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TRI_vocbase_col_t* _collection;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief status of collection when invoking the guard
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////////////////////////////////////////////////////////////////////////////////
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TRI_vocbase_col_status_e _originalStatus;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not to restore the original collection status
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////////////////////////////////////////////////////////////////////////////////
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bool _restoreOriginalStatus;
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};
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}
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}
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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