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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 <cassert>
namespace storage::lib { class ClusterState; }
namespace storage::distributor {
class BucketOwnership
{
const lib::ClusterState* _checkedState;
bool _owned;
BucketOwnership(const lib::ClusterState& checkedState) noexcept
: _checkedState(&checkedState),
_owned(false)
{ }
public:
constexpr BucketOwnership() noexcept : _checkedState(nullptr), _owned(true) {}
[[nodiscard]] bool isOwned() const noexcept { return _owned; }
/**
* Cluster state in which the ownership check failed. Lifetime of returned
* reference depends on when the active or pending cluster state of the
* distributor may be altered, so it should be used immediately and not
* stored away. Since the distributor is single threaded, immediate use
* should be safe.
*
* Precondition: isOwned() == false
*/
const lib::ClusterState& getNonOwnedState() noexcept {
assert(!isOwned());
return *_checkedState;
}
static constexpr BucketOwnership createOwned() noexcept {
return BucketOwnership();
}
static BucketOwnership createNotOwnedInState(const lib::ClusterState& s) noexcept {
return BucketOwnership(s);
}
};
}
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