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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 "buffer_free_list.h"
#include "entryref.h"
#include <vector>
namespace vespalib::datastore {
/**
* Class containing the free list for a single buffer type id.
*
* This consists of a stack of buffer free lists,
* where the newest attached is used when getting an EntryRef for reuse.
*/
class FreeList {
private:
std::vector<BufferFreeList*> _free_lists;
public:
FreeList();
~FreeList();
FreeList(FreeList&&) = default; // Needed for emplace_back() during setup.
FreeList(const FreeList&) = delete;
FreeList& operator=(const FreeList&) = delete;
FreeList& operator=(BufferFreeList&&) = delete;
void attach(BufferFreeList& buf_list);
void detach(BufferFreeList& buf_list);
bool empty() const { return _free_lists.empty(); }
size_t size() const { return _free_lists.size(); }
EntryRef pop_entry() {
return _free_lists.back()->pop_entry();
}
};
}
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