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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/vespalib/util/small_vector.h>
namespace storage::distributor {
/*
* Bundle of ideal service layer nodes for a bucket.
*/
class IdealServiceLayerNodesBundle {
public:
using ConstNodesRef = vespalib::ConstArrayRef<uint16_t>;
class Index {
public:
constexpr explicit Index(uint16_t index) noexcept : _index(index) {}
constexpr bool valid() const noexcept {
return _index < MAX_INDEX;
}
constexpr operator uint16_t () const noexcept { return _index; }
static constexpr Index invalid() noexcept { return Index(MAX_INDEX); }
private:
static constexpr uint16_t MAX_INDEX = 0xffff;
uint16_t _index;
};
struct Node2Index {
virtual ~Node2Index() = default;
virtual Index lookup(uint16_t node) const noexcept = 0;
};
class NonRetiredOrMaintenance2Index final : public Node2Index {
public:
NonRetiredOrMaintenance2Index(const IdealServiceLayerNodesBundle & idealState) noexcept : _idealState(idealState) {}
Index lookup(uint16_t node) const noexcept override {
return _idealState.nonretired_or_maintenance_index(node);
}
private:
const IdealServiceLayerNodesBundle & _idealState;
};
class ConstNodesRef2Index final : public Node2Index {
public:
ConstNodesRef2Index(ConstNodesRef idealState) noexcept : _idealState(idealState) {}
Index lookup(uint16_t node) const noexcept override;
private:
ConstNodesRef _idealState;
};
IdealServiceLayerNodesBundle() noexcept;
IdealServiceLayerNodesBundle(IdealServiceLayerNodesBundle &&) noexcept;
~IdealServiceLayerNodesBundle();
void set_nodes(ConstNodesRef nodes, ConstNodesRef nonretired_nodes, ConstNodesRef nonretired_or_maintenance_nodes);
ConstNodesRef available_nodes() const noexcept { return {_nodes.data(), _available_sz}; }
ConstNodesRef available_nonretired_nodes() const noexcept { return {_nodes.data() + _available_sz, _nonretired_sz}; }
ConstNodesRef available_nonretired_or_maintenance_nodes() const noexcept {
uint16_t offset = _available_sz + _nonretired_sz;
return {_nodes.data() + offset, _nodes.size() - offset};
}
bool is_nonretired_or_maintenance(uint16_t node) const noexcept {
return nonretired_or_maintenance_index(node) != Index::invalid();
}
NonRetiredOrMaintenance2Index nonretired_or_maintenance_to_index() const noexcept { return {*this}; }
ConstNodesRef2Index available_to_index() const noexcept { return {available_nodes()}; }
private:
struct LookupMap;
Index nonretired_or_maintenance_index(uint16_t node) const noexcept;
vespalib::SmallVector<uint16_t,16> _nodes;
std::unique_ptr<LookupMap> _nonretired_or_maintenance_node_2_index;
uint16_t _available_sz;
uint16_t _nonretired_sz;
};
}
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