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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/searchlib/fef/handle.h>
#include <vespa/searchlib/fef/match_data_details.h>
#include <vespa/vespalib/stllike/hash_map.h>
#include <vespa/vespalib/util/noncopyable.hpp>
namespace search::fef { class MatchData; }
namespace proton::matching {
/**
* This is a recorder that will register all handles used by any features for a given query.
* It is activated using thread locals by using the Binder.
* In order to ensure that no handles goes by unnoticed and asserter is added. It should typically have the
* same lifespan as the recorder itself.
* After the Binders has gone out of scope this recorder has a list of all feature handles that might be
* by this query. This can then be used to avoid a lot of unpacking of data.
*/
class HandleRecorder
{
public:
using HandleMap = vespalib::hash_map<search::fef::TermFieldHandle, search::fef::MatchDataDetails>;
class Binder : public vespalib::noncopyable {
public:
Binder(HandleRecorder & recorder);
~Binder();
};
class Asserter : public vespalib::noncopyable {
public:
Asserter();
~Asserter();
};
HandleRecorder();
~HandleRecorder();
const HandleMap& get_handles() const { return _handles; }
HandleMap steal_handles() && { return std::move(_handles); }
static void register_handle(search::fef::TermFieldHandle handle,
search::fef::MatchDataDetails requested_details);
vespalib::string to_string() const;
void tag_match_data(search::fef::MatchData &match_data);
private:
void add(search::fef::TermFieldHandle handle,
search::fef::MatchDataDetails requested_details);
HandleMap _handles;
};
}
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