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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_enum_store.h"
#include "loadedenumvalue.h"
#include "multivalueattribute.h"
#include "no_loaded_vector.h"
#include <vespa/searchcommon/attribute/multivalue.h>
namespace search {
class ReaderBase;
/**
* Implementation of multi value enum attribute that uses an underlying enum store
* to store unique values and a multi value mapping to store enum indices for each document.
*
* B: EnumAttribute<BaseClass>
* M: MultiValueType
*/
template <typename B, typename M>
class MultiValueEnumAttribute : public MultiValueAttribute<B, M>
{
protected:
using AtomicEntryRef = vespalib::datastore::AtomicEntryRef;
using Change = typename B::BaseClass::Change;
using DocId = typename B::BaseClass::DocId;
using EnumHandle = typename B::BaseClass::EnumHandle;
using LoadedVector = typename B::BaseClass::LoadedVector;
using ValueModifier = typename B::BaseClass::ValueModifier;
using WeightedEnum = typename B::BaseClass::WeightedEnum;
using generation_t = typename B::BaseClass::generation_t;
using DocIndices = typename MultiValueAttribute<B, M>::DocumentValues;
using EnumIndex = IEnumStore::Index;
using EnumStoreBatchUpdater = typename B::EnumStoreBatchUpdater;
using EnumVector = IEnumStore::EnumVector;
using WeightedIndex = typename MultiValueAttribute<B, M>::MultiValueType;
using WeightedIndexArrayRef = typename MultiValueAttribute<B, M>::MultiValueArrayRef;
using WeightedIndexVector = typename MultiValueAttribute<B, M>::ValueVector;
// from MultiValueAttribute
bool extractChangeData(const Change & c, EnumIndex & idx) override; // EnumIndex is ValueType. Use EnumStore
// from EnumAttribute
void considerAttributeChange(const Change & c, EnumStoreBatchUpdater & inserter) override; // same for both string and numeric
virtual void applyValueChanges(const DocIndices& docIndices, EnumStoreBatchUpdater& updater);
virtual void freezeEnumDictionary() {
this->getEnumStore().freeze_dictionary();
}
void fillValues(LoadedVector & loaded) override;
void load_enumerated_data(ReaderBase& attrReader, enumstore::EnumeratedPostingsLoader& loader, size_t num_values) override;
void load_enumerated_data(ReaderBase& attrReader, enumstore::EnumeratedLoader& loader) override;
virtual void mergeMemoryStats(vespalib::MemoryUsage & total) { (void) total; }
public:
MultiValueEnumAttribute(const vespalib::string & baseFileName, const AttributeVector::Config & cfg);
void onCommit() override;
void onUpdateStat() override;
void reclaim_memory(generation_t oldest_used_gen) override;
void before_inc_generation(generation_t current_gen) override;
//-----------------------------------------------------------------------------------------------------------------
// Attribute read API
//-----------------------------------------------------------------------------------------------------------------
EnumHandle getEnum(DocId doc) const override {
WeightedIndexArrayRef indices(this->_mvMapping.get(doc));
if (indices.size() == 0) {
return std::numeric_limits<uint32_t>::max();
} else {
return multivalue::get_value_ref(indices[0]).load_acquire().ref();
}
}
uint32_t get(DocId doc, EnumHandle * e, uint32_t sz) const override {
WeightedIndexArrayRef indices(this->_mvMapping.get(doc));
uint32_t valueCount = indices.size();
for (uint32_t i = 0, m = std::min(sz, valueCount); i < m; ++i) {
e[i] = multivalue::get_value_ref(indices[i]).load_acquire().ref();
}
return valueCount;
}
uint32_t get(DocId doc, WeightedEnum * e, uint32_t sz) const override {
WeightedIndexArrayRef indices(this->_mvMapping.get(doc));
uint32_t valueCount = indices.size();
for (uint32_t i = 0, m = std::min(sz, valueCount); i < m; ++i) {
e[i] = WeightedEnum(multivalue::get_value_ref(indices[i]).load_acquire().ref(), multivalue::get_weight(indices[i]));
}
return valueCount;
}
std::unique_ptr<AttributeSaver> onInitSave(vespalib::stringref fileName) override;
};
} // namespace search
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