mirror of https://gitee.com/bigwinds/arangodb
105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2017-2017 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_GRAPH_CLUSTER_TRAVERSER_CACHE_H
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#define ARANGOD_GRAPH_CLUSTER_TRAVERSER_CACHE_H 1
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#include "Cluster/ClusterInfo.h"
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#include "Cluster/TraverserEngineRegistry.h"
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#include "Graph/TraverserCache.h"
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#include <velocypack/StringRef.h>
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namespace arangodb {
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namespace aql {
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struct AqlValue;
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}
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namespace transaction {
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class Methods;
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}
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namespace velocypack {
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class Builder;
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class Slice;
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} // namespace velocypack
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namespace graph {
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class ClusterTraverserCache : public TraverserCache {
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public:
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ClusterTraverserCache(aql::Query* query,
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std::unordered_map<ServerID, traverser::TraverserEngineID> const* engines);
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~ClusterTraverserCache() {}
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/// @brief will convert the EdgeDocumentToken to a slice
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arangodb::velocypack::Slice lookupToken(EdgeDocumentToken const& token) override;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Inserts the real document stored within the token
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/// into the given builder. No need for actual lookup
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//////////////////////////////////////////////////////////////////////////////
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void insertEdgeIntoResult(graph::EdgeDocumentToken const& idToken,
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arangodb::velocypack::Builder& builder) override;
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/// Lookup document in cache and add it into the builder
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void insertVertexIntoResult(arangodb::velocypack::StringRef idString, velocypack::Builder& builder) override;
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/// Lookup document in cache and transform it to an AqlValue
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aql::AqlValue fetchVertexAqlResult(arangodb::velocypack::StringRef idString) override;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Return AQL value containing the result
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/// The document will either be fetched from storage or looked up in
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/// the datalake (on the coordinator)
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//////////////////////////////////////////////////////////////////////////////
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aql::AqlValue fetchEdgeAqlResult(graph::EdgeDocumentToken const& idToken) override;
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std::unordered_map<ServerID, traverser::TraverserEngineID> const* engines() const {
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return _engines;
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}
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/// Map of already fetched vertices and edges (raw _id attribute)
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std::unordered_map<arangodb::velocypack::StringRef, arangodb::velocypack::Slice>& cache() {
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return _cache;
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}
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std::vector<std::shared_ptr<arangodb::velocypack::Builder>>& datalake() {
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return _datalake;
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}
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size_t& insertedDocuments() { return _insertedDocuments; }
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size_t& filteredDocuments() { return _filteredDocuments; }
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private:
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/// @brief link by _id into our data dump
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std::unordered_map<arangodb::velocypack::StringRef, arangodb::velocypack::Slice> _cache;
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/// @brief dump for our edge and vertex documents
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std::vector<std::shared_ptr<arangodb::velocypack::Builder>> _datalake;
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std::unordered_map<ServerID, traverser::TraverserEngineID> const* _engines;
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};
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} // namespace graph
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} // namespace arangodb
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#endif
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