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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 <vespa/vespalib/stllike/string.h>
#include <vector>
#include <memory>
#include <mutex>
#include <atomic>
namespace search::queryeval {
class Searchable;
class IRequestContext;
class SearchIterator;
class Blueprint;
}
namespace search::fef { class MatchData; }
namespace proton::matching {
class RangeQueryLocator;
/**
* This class is responsible for creating attribute-based search
* iterators that are used to limit the search space. Each search
* thread wants a separate search iterator, but the blueprint is
* shared between threads. All threads should request the same number
* of hits, so this class just lets the first thread requesting a
* search decide the number of hits in the underlying blueprint.
**/
class AttributeLimiter
{
public:
enum DiversityCutoffStrategy { LOOSE, STRICT};
AttributeLimiter(const RangeQueryLocator & _rangeQueryLocator,
search::queryeval::Searchable &searchable_attributes,
const search::queryeval::IRequestContext & requestContext,
const vespalib::string &attribute_name, bool descending,
const vespalib::string &diversity_attribute,
double diversityCutoffFactor,
DiversityCutoffStrategy diversityCutoffStrategy);
~AttributeLimiter();
std::unique_ptr<search::queryeval::SearchIterator> create_search(size_t want_hits, size_t max_group_size, bool strictSearch);
bool was_used() const;
ssize_t getEstimatedHits() const;
static DiversityCutoffStrategy toDiversityCutoffStrategy(vespalib::stringref strategy);
private:
search::queryeval::Searchable & _searchable_attributes;
const search::queryeval::IRequestContext & _requestContext;
const RangeQueryLocator & _rangeQueryLocator;
vespalib::string _attribute_name;
bool _descending;
vespalib::string _diversity_attribute;
std::mutex _lock;
std::vector<std::unique_ptr<search::fef::MatchData>> _match_datas;
std::unique_ptr<search::queryeval::Blueprint> _blueprint;
std::atomic<ssize_t> _estimatedHits;
double _diversityCutoffFactor;
DiversityCutoffStrategy _diversityCutoffStrategy;
};
}
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