mirror of https://gitee.com/bigwinds/arangodb
108 lines
3.4 KiB
C++
108 lines
3.4 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(ResourceMonitor* resourceMonitor)
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: _resourceMonitor(resourceMonitor) {}
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/// @brief destroy the manager
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AqlItemBlockManager::~AqlItemBlockManager() { }
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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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// LOG_TOPIC(TRACE, arangodb::Logger::FIXME) << "requesting AqlItemBlock of " << nrItems << " x " << nrRegs;
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size_t const targetSize = nrItems * nrRegs;
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AqlItemBlock* block = nullptr;
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size_t i = Bucket::getId(targetSize);
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int tries = 0;
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while (tries++ < 2) {
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TRI_ASSERT(i < numBuckets);
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if (!_buckets[i].empty()) {
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block = _buckets[i].pop();
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TRI_ASSERT(block != nullptr);
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block->eraseAll();
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block->rescale(nrItems, nrRegs);
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// LOG_TOPIC(TRACE, arangodb::Logger::FIXME) << "returned cached AqlItemBlock with dimensions " << block->size() << " x " << block->getNrRegs();
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break;
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}
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// try next (bigger) bucket
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if (++i >= numBuckets) {
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break;
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}
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}
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if (block == nullptr) {
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block = new AqlItemBlock(_resourceMonitor, nrItems, nrRegs);
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// LOG_TOPIC(TRACE, arangodb::Logger::FIXME) << "created AqlItemBlock with dimensions " << block->size() << " x " << block->getNrRegs();
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}
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TRI_ASSERT(block != nullptr);
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TRI_ASSERT(block->size() == nrItems);
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TRI_ASSERT(block->getNrRegs() == nrRegs);
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TRI_ASSERT(block->capacity() >= targetSize);
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return block;
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}
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/// @brief return a block to the manager
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void AqlItemBlockManager::returnBlock(AqlItemBlock*& block) noexcept {
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TRI_ASSERT(block != nullptr);
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// LOG_TOPIC(TRACE, arangodb::Logger::FIXME) << "returning AqlItemBlock of dimensions " << block->size() << " x " << block->getNrRegs();
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size_t const targetSize = block->size() * block->getNrRegs();
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size_t const i = Bucket::getId(targetSize);
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TRI_ASSERT(i < numBuckets);
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if (!_buckets[i].full()) {
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// recycle the block
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block->destroy();
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// store block in bucket (this will not fail)
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_buckets[i].push(block);
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} else {
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// bucket is full. simply delete the block
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delete block;
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}
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block = nullptr;
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}
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AqlItemBlockManager::Bucket::Bucket()
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: numItems(0) {
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for (size_t i = 0; i < numBlocksPerBucket; ++i) {
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blocks[i] = nullptr;
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}
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}
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AqlItemBlockManager::Bucket::~Bucket() {
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while (!empty()) {
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delete pop();
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}
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}
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