mirror of https://gitee.com/bigwinds/arangodb
132 lines
4.8 KiB
C++
132 lines
4.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 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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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_UTILS_COLLECTION_KEYS_REPOSITORY_H
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#define ARANGOD_UTILS_COLLECTION_KEYS_REPOSITORY_H 1
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#include "Basics/Common.h"
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#include "Basics/Mutex.h"
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#include "Basics/MutexLocker.h"
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#include "Utils/CollectionKeys.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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class CollectionKeys;
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class CollectionKeysRepository {
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public:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief create a collection keys repository
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//////////////////////////////////////////////////////////////////////////////
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CollectionKeysRepository();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief destroy a collection keys repository
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//////////////////////////////////////////////////////////////////////////////
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~CollectionKeysRepository();
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public:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief stores collection keys in the repository
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//////////////////////////////////////////////////////////////////////////////
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void store(std::unique_ptr<CollectionKeys>);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief remove a keys entry by id
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//////////////////////////////////////////////////////////////////////////////
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bool remove(CollectionKeysId id);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief find an existing collection keys list by id
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/// if found, the keys will be returned with the usage flag set to true.
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/// it must be returned later using release()
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//////////////////////////////////////////////////////////////////////////////
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CollectionKeys* find(CollectionKeysId);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief return a cursor
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//////////////////////////////////////////////////////////////////////////////
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void release(CollectionKeys*);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the repository contains used keys
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//////////////////////////////////////////////////////////////////////////////
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bool containsUsed();
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/// @brief return number of elements in the repository
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size_t count();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief run a garbage collection on the data, returns if anything was left
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/// over.
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////////////////////////////////////////////////////////////////////////////////
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bool garbageCollect(bool force);
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//////////////////////////////////////////////////////////////////////////
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/// @brief stop further stores, this is used on shutdown
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//////////////////////////////////////////////////////////////////////////
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void stopStores() {
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MUTEX_LOCKER(mutexLocker, _lock);
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_stopped = true;
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}
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief mutex for the repository
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//////////////////////////////////////////////////////////////////////////////
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Mutex _lock;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief list of current keys
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//////////////////////////////////////////////////////////////////////////////
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std::unordered_map<CollectionKeysId, std::unique_ptr<CollectionKeys>> _keys;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief maximum number of keys to garbage-collect in one go
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//////////////////////////////////////////////////////////////////////////////
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static size_t const MaxCollectCount;
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////////////////////////////////////////////////////////////////////////////
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/// @brief stopped flag, indicating that no more CollectionKeys can be
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/// stored
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////////////////////////////////////////////////////////////////////////////
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bool _stopped;
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};
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} // namespace arangodb
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#endif
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