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#pragma once
#include <util/generic/buffer.h>
#include <util/generic/deque.h>
#include <util/generic/noncopyable.h>
#include <util/generic/strbuf.h>
#include <util/system/tls.h>
#include <util/thread/singleton.h>
namespace NCodecs {
template <class TItem>
struct TClear {
void operator()(TItem& item) const {
item.Clear();
}
};
template <class TItem, class TCleaner = TClear<TItem>>
class TTlsCache {
using TSelf = TTlsCache<TItem, TCleaner>;
struct TItemHolder: public TIntrusiveListItem<TItemHolder> {
TItemHolder(TSelf& factory)
: Factory(factory)
{
}
void Release() {
Factory.Release(*this);
}
TSelf& Factory;
TItem Item;
};
class TItemGuard {
public:
explicit TItemGuard(TSelf& fact)
: Holder(fact.Acquire())
{
}
TItemGuard(TItemGuard&& other) noexcept {
*this = std::move(other);
}
TItemGuard& operator=(TItemGuard&& other) noexcept {
if (&other != this) {
std::swap(Holder, other.Holder);
}
return *this;
}
~TItemGuard() {
if (Holder) {
Holder->Release();
}
}
TItem& Get() & {
Y_ASSERT(Holder);
return Holder->Item;
}
TItem& Get() && = delete;
private:
TItemHolder* Holder = nullptr;
};
public:
TItemGuard Item() {
return TItemGuard(*this);
}
static TSelf& TlsInstance() {
return *FastTlsSingleton<TSelf>();
}
private:
TItemHolder* Acquire() {
if (Free.Empty()) {
return new TItemHolder(*this);
} else {
return Free.PopBack();
}
}
void Release(TItemHolder& item) {
Cleaner(item.Item);
Free.PushBack(&item);
}
private:
TIntrusiveListWithAutoDelete<TItemHolder, TDelete> Free;
TCleaner Cleaner;
};
using TBufferTlsCache = TTlsCache<TBuffer>;
}
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