mirror of https://gitee.com/bigwinds/arangodb
125 lines
4.6 KiB
C++
125 lines
4.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, collection scanners
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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_AQL_COLLECTION_SCANNER_H
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#define ARANGODB_AQL_COLLECTION_SCANNER_H 1
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#include "Basics/Common.h"
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#include "Utils/AqlTransaction.h"
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#include "VocBase/document-collection.h"
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#include "VocBase/transaction.h"
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#include "VocBase/vocbase.h"
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namespace triagens {
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namespace aql {
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// -----------------------------------------------------------------------------
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// --SECTION-- struct CollectionScanner
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// -----------------------------------------------------------------------------
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struct CollectionScanner {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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CollectionScanner (triagens::arango::AqlTransaction*,
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TRI_transaction_collection_t*);
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virtual ~CollectionScanner ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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virtual int scan (std::vector<TRI_doc_mptr_copy_t>&, size_t) = 0;
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virtual void reset () = 0;
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triagens::arango::AqlTransaction* trx;
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TRI_transaction_collection_t* trxCollection;
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uint64_t totalCount;
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uint64_t position;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- struct RandomCollectionScanner
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// -----------------------------------------------------------------------------
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struct RandomCollectionScanner final : public CollectionScanner {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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RandomCollectionScanner (triagens::arango::AqlTransaction*,
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TRI_transaction_collection_t*);
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int scan (std::vector<TRI_doc_mptr_copy_t>&,
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size_t) override;
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void reset () override;
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uint64_t initialPosition;
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uint64_t step;
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- struct LinearCollectionScanner
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// -----------------------------------------------------------------------------
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struct LinearCollectionScanner final : public CollectionScanner {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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LinearCollectionScanner (triagens::arango::AqlTransaction*,
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TRI_transaction_collection_t*);
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int scan (std::vector<TRI_doc_mptr_copy_t>&,
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size_t) override;
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void reset () override;
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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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