mirror of https://gitee.com/bigwinds/arangodb
73 lines
2.3 KiB
C++
73 lines
2.3 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_ENUMERATE_COLLECTION_BLOCK_H
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#define ARANGOD_AQL_ENUMERATE_COLLECTION_BLOCK_H 1
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#include "Aql/DocumentProducingBlock.h"
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include <velocypack/Iterator.h>
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#include <velocypack/Slice.h>
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namespace arangodb {
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class LocalDocumentId;
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struct OperationCursor;
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namespace aql {
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class AqlItemBlock;
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struct Collection;
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class ExecutionEngine;
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class EnumerateCollectionBlock final : public ExecutionBlock, public DocumentProducingBlock {
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public:
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EnumerateCollectionBlock(ExecutionEngine* engine, EnumerateCollectionNode const* ep);
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/// @brief initializeCursor
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std::pair<ExecutionState, Result> initializeCursor(AqlItemBlock* items, size_t pos) override;
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/// @brief getSome
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std::pair<ExecutionState, std::unique_ptr<AqlItemBlock>> getSome(size_t atMost) override final;
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// skip atMost documents, returns the number actually skipped . . .
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std::pair<ExecutionState, size_t> skipSome(size_t atMost) override final;
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private:
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/// @brief collection
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Collection const* _collection;
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/// @brief cursor
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std::unique_ptr<OperationCursor> _cursor;
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/// @brief Persistent counter of elements that are in flight during WAITING
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/// has to be resetted as soon as we return with DONE/HASMORE
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size_t _inflight;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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