50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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#pragma once
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#include <atomic>
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#include "storage/indexes/index_base.hpp"
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#include "utils/option.hpp"
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#include "utils/option_ptr.hpp"
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namespace tx
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{
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class Transaction;
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}
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// Holds onde index which can be changed.
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// TG - type group
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// K - key of index_records
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template <class TG, class K>
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class IndexHolder
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{
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public:
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IndexHolder() = default;
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IndexHolder(IndexHolder const &) = delete;
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IndexHolder(IndexHolder &&) = default;
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// Sets index for this property family. Treturns false if index is already
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// present.
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bool set_index(std::unique_ptr<IndexBase<TG, K>> inx);
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// Returns index for read only if it is present and it's valid for read.
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OptionPtr<IndexBase<TG, K>> get_read() const;
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// Returns index for write only if it's present and transaction is
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// responsibly for updating it.
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OptionPtr<IndexBase<TG, K>> get_write(const tx::Transaction &t) const;
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// Removes index if it is given index. Caller is now responsable of
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// disposing index in a safe way.
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Option<std::unique_ptr<IndexBase<TG, K>>>
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remove_index(IndexBase<TG, K> *index);
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// Caller is now responsable of disposing index in a safe way.
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Option<std::unique_ptr<IndexBase<TG, K>>> remove_index();
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private:
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std::atomic<IndexBase<TG, K> *> index = {nullptr};
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};
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