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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 "datastore.h"
#include "entryref.h"
#include "unique_store_add_result.h"
#include "unique_store_buffer_type.h"
#include "unique_store_entry.h"
#include "i_compactable.h"
namespace vespalib::alloc { class MemoryAllocator; }
namespace vespalib::datastore {
/**
* Allocator for unique values of type EntryT that is accessed via a
* 32-bit EntryRef.
*/
template <typename EntryT, typename RefT = EntryRefT<22> >
class UniqueStoreAllocator : public ICompactable
{
public:
using DataStoreType = DataStoreT<RefT>;
using EntryType = EntryT;
using EntryConstRefType = const EntryType &;
using WrappedEntryType = UniqueStoreEntry<EntryType>;
using RefType = RefT;
private:
DataStoreType _store;
UniqueStoreBufferType<WrappedEntryType> _typeHandler;
public:
UniqueStoreAllocator(std::shared_ptr<alloc::MemoryAllocator> memory_allocator);
~UniqueStoreAllocator() override;
EntryRef allocate(const EntryType& value);
void hold(EntryRef ref);
EntryRef move_on_compact(EntryRef ref) override;
const WrappedEntryType& get_wrapped(EntryRef ref) const {
RefType iRef(ref);
return *_store.template getEntry<WrappedEntryType>(iRef);
}
const EntryType& get(EntryRef ref) const {
return get_wrapped(ref).value();
}
DataStoreType& get_data_store() noexcept { return _store; }
const DataStoreType& get_data_store() const noexcept { return _store; }
};
}
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