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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 <cstdint>
namespace document { class BucketId; }
namespace storage::lib {
class ClusterState;
class Distribution;
}
namespace storage::distributor {
/**
* Calculator for determining if a bucket is owned by the current distributor.
* Ideal state calculations are cached and reused for all consecutive sub-buckets
* under the same super bucket. The cache is invalidated when a new super bucket
* is encountered, so it only provides a benefit when invoked in bucket ID order.
*
* Not thread safe due to internal caching.
*/
class BucketOwnershipCalculator {
const lib::ClusterState& _state;
const lib::Distribution& _distribution;
mutable uint64_t _cached_decision_superbucket;
const uint16_t _this_node_index;
mutable bool _cached_owned;
public:
BucketOwnershipCalculator(const lib::ClusterState& state,
const lib::Distribution& distribution,
uint16_t this_node_index) noexcept
: _state(state),
_distribution(distribution),
_cached_decision_superbucket(UINT64_MAX),
_this_node_index(this_node_index),
_cached_owned(false)
{
}
[[nodiscard]] bool this_distributor_owns_bucket(const document::BucketId& bucket_id) const;
};
}
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