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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 "readable_attribute_vector.h"
#include <vespa/searchcommon/attribute/i_document_meta_store_context.h>
#include <vespa/vespalib/stllike/string.h>
namespace search::attribute {
class BitVectorSearchCache;
class ReadableAttributeVector;
class ReferenceAttribute;
/**
* Attribute vector which does not store values of its own, but rather serves as a
* convenient indirection wrapper towards a target vector, usually in another
* document type altogether. Imported attributes are meant to be used in conjunction
* with a reference attribute, which specifies a dynamic mapping from a local LID to
* a target LID (via an intermediate GID).
*
* Any accessor on the imported attribute for a local LID yields the same result as
* if the same accessor were invoked with the target LID on the target attribute vector.
*/
class ImportedAttributeVector : public ReadableAttributeVector {
public:
using SP = std::shared_ptr<ImportedAttributeVector>;
using MetaStoreReadGuard = search::IDocumentMetaStoreContext::IReadGuard;
ImportedAttributeVector(vespalib::stringref name,
std::shared_ptr<ReferenceAttribute> reference_attribute,
std::shared_ptr<IDocumentMetaStoreContext> document_meta_store,
std::shared_ptr<ReadableAttributeVector> target_attribute,
std::shared_ptr<const IDocumentMetaStoreContext> target_document_meta_store,
bool use_search_cache);
ImportedAttributeVector(vespalib::stringref name,
std::shared_ptr<ReferenceAttribute> reference_attribute,
std::shared_ptr<IDocumentMetaStoreContext> document_meta_store,
std::shared_ptr<ReadableAttributeVector> target_attribute,
std::shared_ptr<const IDocumentMetaStoreContext> target_document_meta_store,
std::shared_ptr<BitVectorSearchCache> search_cache);
~ImportedAttributeVector() override;
const std::shared_ptr<ReferenceAttribute>& getReferenceAttribute() const noexcept {
return _reference_attribute;
}
const std::shared_ptr<IDocumentMetaStoreContext> &getDocumentMetaStore() const {
return _document_meta_store;
}
const std::shared_ptr<ReadableAttributeVector>& getTargetAttribute() const noexcept {
return _target_attribute;
}
const std::shared_ptr<const IDocumentMetaStoreContext> &getTargetDocumentMetaStore() const {
return _target_document_meta_store;
}
const std::shared_ptr<BitVectorSearchCache> &getSearchCache() const {
return _search_cache;
}
void clearSearchCache();
const vespalib::string &getName() const {
return _name;
}
std::unique_ptr<AttributeReadGuard> makeReadGuard(bool stableEnumGuard) const override;
virtual std::unique_ptr<AttributeReadGuard> makeReadGuard(std::shared_ptr<MetaStoreReadGuard> targetMetaStoreReadGuard, bool stableEnumGuard) const;
protected:
vespalib::string _name;
std::shared_ptr<ReferenceAttribute> _reference_attribute;
std::shared_ptr<IDocumentMetaStoreContext> _document_meta_store;
std::shared_ptr<ReadableAttributeVector> _target_attribute;
std::shared_ptr<const IDocumentMetaStoreContext> _target_document_meta_store;
std::shared_ptr<BitVectorSearchCache> _search_cache;
};
}
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