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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/fef/blueprint.h>
#include <vespa/vespalib/util/rand48.h>
namespace search::features {
/**
* Implements the executor for the random feature outputting a number in the interval [0, 1>.
**/
class RandomExecutor : public search::fef::FeatureExecutor {
private:
vespalib::Rand48 _rnd; // seeded once per query
vespalib::Rand48 _matchRnd; // seeded once per match
uint64_t _matchSeed;
public:
RandomExecutor(uint64_t seed, uint64_t matchSeed);
void execute(uint32_t docId) override;
};
/**
* Implements the blueprint for the random feature.
*/
class RandomBlueprint : public search::fef::Blueprint {
private:
uint64_t _seed;
public:
RandomBlueprint();
void visitDumpFeatures(const search::fef::IIndexEnvironment & env, search::fef::IDumpFeatureVisitor & visitor) const override;
search::fef::Blueprint::UP createInstance() const override;
search::fef::ParameterDescriptions getDescriptions() const override {
return search::fef::ParameterDescriptions().
desc().
desc().string(); // in order to name different features
}
bool setup(const search::fef::IIndexEnvironment & env, const search::fef::ParameterList & params) override;
search::fef::FeatureExecutor &createExecutor(const search::fef::IQueryEnvironment &env, vespalib::Stash &stash) const override;
};
}
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