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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 "node_supported_features.h"
#include <vespa/vespalib/stllike/hash_map.h>
#include <memory>
namespace storage::distributor {
/**
* Repo of known mappings from node distribution key to feature set supported by
* the content node with the given distribution key.
*
* Entirely immutable; copy-on-write via make_union_of().
*/
class NodeSupportedFeaturesRepo {
const vespalib::hash_map<uint16_t, NodeSupportedFeatures> _node_features;
struct PrivateCtorTag {};
public:
NodeSupportedFeaturesRepo();
NodeSupportedFeaturesRepo(vespalib::hash_map<uint16_t, NodeSupportedFeatures> features, PrivateCtorTag) noexcept;
~NodeSupportedFeaturesRepo();
// Returns supported node features for node with distribution key node_idx, or a default feature set
// with all features unset if node has no known mapping.
[[nodiscard]] const NodeSupportedFeatures& node_supported_features(uint16_t node_idx) const noexcept;
// Returns a new repo instance containing the union key->features set of self and node_features.
// If there is a duplicate mapping between the two, the features in node_features take precedence
// and will be stored in the new repo.
[[nodiscard]] std::shared_ptr<const NodeSupportedFeaturesRepo>
make_union_of(const vespalib::hash_map<uint16_t, NodeSupportedFeatures>& node_features) const;
};
}
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