mirror of https://gitee.com/bigwinds/arangodb
151 lines
5.7 KiB
C++
151 lines
5.7 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_CURSOR_REPOSITORY_H
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#define ARANGOD_UTILS_CURSOR_REPOSITORY_H 1
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#include "Basics/Common.h"
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#include "Basics/Mutex.h"
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#include "Utils/Cursor.h"
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#include "VocBase/voc-types.h"
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struct TRI_vocbase_t;
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namespace arangodb {
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namespace velocypack {
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class Builder;
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}
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namespace aql {
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struct QueryResult;
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}
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class CursorRepository {
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public:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief create a cursors repository
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//////////////////////////////////////////////////////////////////////////////
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explicit CursorRepository(TRI_vocbase_t& vocbase);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief destroy a cursors repository
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//////////////////////////////////////////////////////////////////////////////
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~CursorRepository();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stores a cursor in the registry
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/// the repository will take ownership of the cursor
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////////////////////////////////////////////////////////////////////////////////
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Cursor* addCursor(std::unique_ptr<Cursor> cursor);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief creates a cursor and stores it in the registry
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/// the cursor will be returned with the usage flag set to true. it must be
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/// returned later using release()
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/// the cursor will take ownership and retain the entire QueryResult object
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//////////////////////////////////////////////////////////////////////////////
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Cursor* createFromQueryResult(aql::QueryResult&&, size_t, double, bool);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief creates a cursor and stores it in the registry
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/// the cursor will be returned with the usage flag set to true. it must be
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/// returned later using release()
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/// the cursor will create a query internally and retain it until deleted
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//////////////////////////////////////////////////////////////////////////////
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Cursor* createQueryStream(std::string const& query,
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std::shared_ptr<velocypack::Builder> const& binds,
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std::shared_ptr<velocypack::Builder> const& opts,
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size_t batchSize, double ttl, bool contextOwnedByExterior,
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std::shared_ptr<transaction::Context> ctx);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief remove a cursor by id
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//////////////////////////////////////////////////////////////////////////////
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bool remove(CursorId, Cursor::CursorType);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief find an existing cursor by id
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/// if found, the cursor 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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Cursor* find(CursorId, Cursor::CursorType, bool&);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief return a cursor
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//////////////////////////////////////////////////////////////////////////////
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void release(Cursor*);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the repository contains a used cursor
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//////////////////////////////////////////////////////////////////////////////
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bool containsUsedCursor();
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size_t count();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief run a garbage collection on the cursors
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/// @return
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//////////////////////////////////////////////////////////////////////////////
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bool garbageCollect(bool);
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief vocbase
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//////////////////////////////////////////////////////////////////////////////
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TRI_vocbase_t& _vocbase;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief mutex for the cursors repository
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//////////////////////////////////////////////////////////////////////////////
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Mutex _lock;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief list of current cursors
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//////////////////////////////////////////////////////////////////////////////
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std::unordered_map<CursorId, std::pair<Cursor*, std::string>> _cursors;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief maximum number of cursors 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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} // namespace arangodb
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#endif
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