mirror of https://gitee.com/bigwinds/arangodb
128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018 ArangoDB 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 Christoph Uhde
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////////////////////////////////////////////////////////////////////////////////
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#include "Aql/AqlValue.h"
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#include "Aql/Collection.h"
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#include "Aql/OutputAqlItemRow.h"
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#include "Basics/Common.h"
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#include "ModificationExecutorTraits.h"
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#include "VocBase/LogicalCollection.h"
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#include <algorithm>
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using namespace arangodb;
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using namespace arangodb::aql;
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namespace arangodb {
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namespace aql {
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std::string toString(AllRowsFetcher&) { return "AllRowsFetcher"; }
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std::string toString(SingleBlockFetcher<true>&) {
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return "SingleBlockFetcher<true>";
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}
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std::string toString(SingleBlockFetcher<false>&) {
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return "SingleBlockFetcher<false>";
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}
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} // namespace aql
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} // namespace arangodb
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template <typename FetcherType>
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ModificationExecutorBase<FetcherType>::ModificationExecutorBase(Fetcher& fetcher, Infos& infos)
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: _infos(infos), _fetcher(fetcher), _prepared(false) {}
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template <typename Modifier, typename FetcherType>
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ModificationExecutor<Modifier, FetcherType>::ModificationExecutor(Fetcher& fetcher, Infos& infos)
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: ModificationExecutorBase<FetcherType>(fetcher, infos), _modifier() {
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this->_infos._trx->pinData(this->_infos._aqlCollection->id()); // important for mmfiles
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}
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template <typename Modifier, typename FetcherType>
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ModificationExecutor<Modifier, FetcherType>::~ModificationExecutor() = default;
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template <typename Modifier, typename FetcherType>
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std::pair<ExecutionState, typename ModificationExecutor<Modifier, FetcherType>::Stats>
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ModificationExecutor<Modifier, FetcherType>::produceRows(OutputAqlItemRow& output) {
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ExecutionState state = ExecutionState::HASMORE;
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ModificationExecutor::Stats stats;
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// TODO - fix / improve prefetching if possible
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while (!this->_prepared && (this->_fetcher.upstreamState() !=
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ExecutionState::DONE /*|| this->_fetcher._prefetched */)) {
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SharedAqlItemBlockPtr block;
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std::tie(state, block) = this->_fetcher.fetchBlockForModificationExecutor(
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_modifier._defaultBlockSize); // Upsert must use blocksize of one!
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// Otherwise it could happen that an insert
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// is not seen by subsequent opererations.
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_modifier._block = block;
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if (state == ExecutionState::WAITING) {
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TRI_ASSERT(_modifier._block == nullptr);
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return {state, std::move(stats)};
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}
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if (_modifier._block == nullptr) {
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TRI_ASSERT(state == ExecutionState::DONE);
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return {state, std::move(stats)};
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}
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TRI_IF_FAILURE("ModificationBlock::getSome") {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
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}
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TRI_ASSERT(_modifier._block != nullptr);
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// prepares modifier for single row output
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this->_prepared = _modifier.doModifications(this->_infos, stats);
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if (!this->_infos._producesResults) {
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this->_prepared = false;
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}
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}
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if (this->_prepared) {
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TRI_ASSERT(_modifier._block != nullptr);
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// Produces the output
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bool thisBlockHasMore = _modifier.doOutput(this->_infos, output);
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if (thisBlockHasMore) {
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return {ExecutionState::HASMORE, std::move(stats)};
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} else {
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// we need to get a new block
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this->_prepared = false;
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}
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}
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return {this->_fetcher.upstreamState(), std::move(stats)};
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}
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template class ::arangodb::aql::ModificationExecutor<Insert, SingleBlockFetcher<false /*allowsBlockPassthrough */>>;
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template class ::arangodb::aql::ModificationExecutor<Insert, AllRowsFetcher>;
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template class ::arangodb::aql::ModificationExecutor<Remove, SingleBlockFetcher<false /*allowsBlockPassthrough */>>;
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template class ::arangodb::aql::ModificationExecutor<Remove, AllRowsFetcher>;
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template class ::arangodb::aql::ModificationExecutor<Replace, SingleBlockFetcher<false /*allowsBlockPassthrough */>>;
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template class ::arangodb::aql::ModificationExecutor<Replace, AllRowsFetcher>;
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template class ::arangodb::aql::ModificationExecutor<Update, SingleBlockFetcher<false /*allowsBlockPassthrough */>>;
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template class ::arangodb::aql::ModificationExecutor<Update, AllRowsFetcher>;
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template class ::arangodb::aql::ModificationExecutor<Upsert, SingleBlockFetcher<false /*allowsBlockPassthrough */>>;
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template class ::arangodb::aql::ModificationExecutor<Upsert, AllRowsFetcher>;
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