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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 <memory>
#include <vespa/vespalib/util/trinary.h>
namespace vespalib { class nbostream; }
namespace storage::lib {
class ClusterState;
class Distribution;
}
namespace storage::spi {
class Bucket;
/**
* Used to determine the state of the current node and its buckets.
*/
class ClusterState {
public:
using SP = std::shared_ptr<ClusterState>;
ClusterState(const lib::ClusterState& state,
uint16_t nodeIndex,
const lib::Distribution& distribution,
bool maintenanceInAllSpaces = false);
ClusterState(const ClusterState& other);
ClusterState& operator=(const ClusterState& other) = delete;
~ClusterState();
/**
* Returns Trinary::True if the system has been set up to have
* "ready" nodes, and the given bucket is in the ideal state
* for readiness. Trinary ::Undefined is returned in case the bucketId is invalid (too few used bits)
*
* @param b The bucket to check.
*/
vespalib::Trinary shouldBeReady(const Bucket& b) const;
/**
* Returns false if the cluster has been deemed down. This can happen
* if the fleet controller has detected that too many nodes are down
* compared to the complete list of nodes, and deigns the system to be
* unusable.
*/
[[nodiscard]] bool clusterUp() const noexcept;
/**
* Returns false if this node has been set in a state where it should not
* receive external load.
*
* TODO rename to indicate bucket space affinity.
*/
[[nodiscard]] bool nodeUp() const noexcept;
/**
* Returns true iff this node is marked as Initializing in the cluster state.
*
* TODO remove, init no longer used internally.
*/
[[nodiscard]] bool nodeInitializing() const noexcept;
/**
* Returns true iff this node is marked as Retired in the cluster state.
*/
[[nodiscard]] bool nodeRetired() const noexcept;
/**
* Returns true iff this node is marked as Maintenance in all bucket space cluster states.
*/
[[nodiscard]] bool nodeMaintenance() const noexcept;
/**
* Returns a serialized form of this object.
*/
void serialize(vespalib::nbostream& o) const;
private:
std::unique_ptr<lib::ClusterState> _state;
std::unique_ptr<lib::Distribution> _distribution;
uint16_t _nodeIndex;
bool _maintenanceInAllSpaces;
void deserialize(vespalib::nbostream&);
bool nodeHasStateOneOf(const char* states) const noexcept;
};
}
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