mirror of https://gitee.com/bigwinds/arangodb
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2019 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 Tobias Gödderz
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_SCATTER_EXECUTOR_H
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#define ARANGOD_AQL_SCATTER_EXECUTOR_H
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#include "Aql/ClusterBlocks.h"
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#include "Aql/ClusterNodes.h"
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#include "Aql/ExecutionBlockImpl.h"
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namespace arangodb {
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namespace aql {
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// The ScatterBlock is actually implemented by specializing ExecutionBlockImpl,
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// so this class only exists to identify the specialization.
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class ScatterExecutor {};
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/**
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* @brief See ExecutionBlockImpl.h for documentation.
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*/
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template <>
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class ExecutionBlockImpl<ScatterExecutor> : public BlockWithClients {
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public:
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// TODO Even if it's not strictly necessary here, for consistency's sake the
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// non-standard argument (shardIds) should probably be moved into some
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// ScatterExecutorInfos class.
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ExecutionBlockImpl(ExecutionEngine* engine, ScatterNode const* node,
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ExecutorInfos&& infos, std::vector<std::string> const& shardIds);
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~ExecutionBlockImpl() override = default;
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std::pair<ExecutionState, Result> initializeCursor(InputAqlItemRow const& input) override;
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/// @brief getSomeForShard
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std::pair<ExecutionState, std::unique_ptr<AqlItemBlock>> getSomeForShard(
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size_t atMost, std::string const& shardId) override;
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/// @brief skipSomeForShard
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std::pair<ExecutionState, size_t> skipSomeForShard(size_t atMost,
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std::string const& shardId) override;
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private:
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std::pair<ExecutionState, std::unique_ptr<AqlItemBlock>> traceGetSomeEnd(
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ExecutionState state, std::unique_ptr<AqlItemBlock> result);
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std::pair<ExecutionState, size_t> traceSkipSomeEnd(ExecutionState state, size_t skipped);
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/// @brief getSomeForShard
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std::pair<ExecutionState, std::unique_ptr<AqlItemBlock>> getSomeForShardWithoutTrace(
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size_t atMost, std::string const& shardId);
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/// @brief skipSomeForShard
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std::pair<ExecutionState, size_t> skipSomeForShardWithoutTrace(size_t atMost,
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std::string const& shardId);
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std::pair<ExecutionState, arangodb::Result> getOrSkipSomeForShard(
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size_t atMost, bool skipping, std::unique_ptr<AqlItemBlock>& result,
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size_t& skipped, std::string const& shardId);
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bool hasMoreForClientId(size_t clientId) const;
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/// @brief getHasMoreStateForClientId: State for client <clientId>?
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ExecutionState getHasMoreStateForClientId(size_t clientId) const;
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ExecutorInfos const& infos() const { return _infos; }
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Query const& getQuery() const { return _query; }
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private:
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ExecutorInfos _infos;
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Query const& _query;
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/// @brief _posForClient:
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std::vector<std::pair<size_t, size_t>> _posForClient;
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};
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} // namespace aql
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} // namespace arangodb
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#endif // ARANGOD_AQL_SCATTER_EXECUTOR_H
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