mirror of https://gitee.com/bigwinds/arangodb
60 lines
1.9 KiB
C++
60 lines
1.9 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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#include "AqlItemBlockManager.h"
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#include "Aql/AqlItemBlock.h"
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using namespace arangodb::aql;
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/// @brief create the manager
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AqlItemBlockManager::AqlItemBlockManager() : _last(nullptr) {}
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/// @brief destroy the manager
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AqlItemBlockManager::~AqlItemBlockManager() { delete _last; }
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/// @brief request a block with the specified size
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AqlItemBlock* AqlItemBlockManager::requestBlock(size_t nrItems,
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RegisterId nrRegs) {
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if (_last != nullptr && _last->size() == nrItems &&
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_last->getNrRegs() == nrRegs) {
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auto block = _last;
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// don't hand out the same block next time
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_last = nullptr;
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block->eraseAll();
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return block;
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}
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return new AqlItemBlock(nrItems, nrRegs);
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}
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/// @brief return a block to the manager
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void AqlItemBlockManager::returnBlock(AqlItemBlock*& block) {
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TRI_ASSERT(block != nullptr);
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block->destroy();
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delete _last;
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_last = block;
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block = nullptr;
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}
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