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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "multienumattributesaver.h"
#include "multivalueattributesaverutils.h"
#include <vespa/searchcommon/attribute/multivalue.h>
#include <vespa/log/log.h>
LOG_SETUP(".searchlib.attribute.multi_enum_attribute_saver");
using vespalib::GenerationHandler;
using search::multivalueattributesaver::CountWriter;
using search::multivalueattributesaver::WeightWriter;
namespace search {
namespace {
/*
* Class to write enum indexes mapped over to either enum values
* or values, depending on the requirements of the save target.
*/
class DatWriter
{
std::vector<IEnumStore::Index> _indexes;
const EnumAttributeSaver::Enumerator &_enumerator;
std::unique_ptr<search::BufferWriter> _datWriter;
std::function<bool()> _compaction_interferred;
public:
DatWriter(IAttributeSaveTarget &saveTarget,
const EnumAttributeSaver::Enumerator &enumerator,
std::function<bool()> compaction_interferred)
: _indexes(),
_enumerator(enumerator),
_datWriter(saveTarget.datWriter().allocBufferWriter()),
_compaction_interferred(compaction_interferred)
{
assert(saveTarget.getEnumerated());
_indexes.reserve(1000);
}
~DatWriter()
{
assert(_indexes.empty());
_datWriter->flush();
}
void flush()
{
if (!_indexes.empty()) {
for (auto ref : _indexes) {
uint32_t enumValue = _enumerator.map_entry_ref_to_enum_value_or_zero(ref);
assert(enumValue != 0u || _compaction_interferred());
// Enumerator enumerates known entry refs (based on
// dictionary tree) to values >= 1, but file format
// starts enumeration at 0.
--enumValue;
_datWriter->write(&enumValue, sizeof(uint32_t));
}
_indexes.clear();
}
}
template <typename MultiValueT>
void
writeValues(vespalib::ConstArrayRef<MultiValueT> values) {
for (const MultiValueT &valueRef : values) {
if (_indexes.size() >= _indexes.capacity()) {
flush();
}
_indexes.push_back(multivalue::get_value_ref(valueRef).load_acquire());
}
}
};
}
template <typename MultiValueT>
MultiValueEnumAttributeSaver<MultiValueT>::
MultiValueEnumAttributeSaver(GenerationHandler::Guard &&guard,
const attribute::AttributeHeader &header,
const MultiValueMapping &mvMapping,
IEnumStore &enumStore)
: Parent(std::move(guard), header, mvMapping),
_mvMapping(mvMapping),
_enumSaver(enumStore),
_enum_store(enumStore),
_compaction_count(enumStore.get_compaction_count())
{
}
template <typename MultiValueT>
bool
MultiValueEnumAttributeSaver<MultiValueT>::compaction_interferred() const
{
return _compaction_count != _enum_store.get_compaction_count();
}
template <typename MultiValueT>
MultiValueEnumAttributeSaver<MultiValueT>::~MultiValueEnumAttributeSaver() = default;
template <typename MultiValueT>
bool
MultiValueEnumAttributeSaver<MultiValueT>::
onSave(IAttributeSaveTarget &saveTarget)
{
bool compaction_broke_save = false;
CountWriter countWriter(saveTarget);
WeightWriter<multivalue::is_WeightedValue_v<MultiValueType>> weightWriter(saveTarget);
DatWriter datWriter(saveTarget, _enumSaver.get_enumerator(),
[this]() { return compaction_interferred(); });
_enumSaver.writeUdat(saveTarget);
_enumSaver.get_enumerator().enumerateValues();
for (uint32_t docId = 0; docId < _frozenIndices.size(); ++docId) {
vespalib::datastore::EntryRef idx = _frozenIndices[docId];
vespalib::ConstArrayRef<MultiValueType> handle(_mvMapping.getDataForIdx(idx));
countWriter.writeCount(handle.size());
weightWriter.writeWeights(handle);
datWriter.writeValues(handle);
if (((docId % 0x1000) == 0) && compaction_interferred()) {
compaction_broke_save = true;
break;
}
}
datWriter.flush();
_enumSaver.clear();
if (compaction_interferred()) {
compaction_broke_save = true;
}
if (compaction_broke_save) {
LOG(warning, "Aborted save of attribute vector to '%s' due to compaction of unique values", get_file_name().c_str());
}
return !compaction_broke_save;
}
using EnumIdxArray = vespalib::datastore::AtomicEntryRef;
using EnumIdxWset = multivalue::WeightedValue<vespalib::datastore::AtomicEntryRef>;
template class MultiValueEnumAttributeSaver<EnumIdxArray>;
template class MultiValueEnumAttributeSaver<EnumIdxWset>;
} // namespace search
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