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#pragma once
#include <library/cpp/containers/stack_vector/stack_vec.h>
#include "packet.h"
namespace NActors {
struct TEvFreeItems : TEventLocal<TEvFreeItems, EventSpaceBegin(TEvents::ES_PRIVATE)> {
static constexpr size_t MaxEvents = 256;
std::list<TEventHolder> FreeQueue;
TStackVec<THolder<IEventBase>, MaxEvents> Events;
TStackVec<THolder<TEventSerializedData>, MaxEvents> Buffers;
std::shared_ptr<std::atomic<TAtomicBase>> Counter;
ui64 NumBytes = 0;
~TEvFreeItems() {
if (Counter) {
TAtomicBase res = Counter->fetch_sub(NumBytes) - NumBytes;
Y_VERIFY(res >= 0);
}
}
bool GetInLineForDestruction(const TIntrusivePtr<TInterconnectProxyCommon>& common) {
Y_VERIFY(!Counter);
const auto& counter = common->DestructorQueueSize;
const auto& max = common->MaxDestructorQueueSize;
if (counter && (TAtomicBase)(counter->fetch_add(NumBytes) + NumBytes) > max) {
counter->fetch_sub(NumBytes);
return false;
}
Counter = counter;
return true;
}
};
class TEventHolderPool {
using TDestroyCallback = std::function<void(THolder<IEventBase>)>;
static constexpr size_t MaxFreeQueueItems = 32;
static constexpr size_t FreeQueueTrimThreshold = MaxFreeQueueItems * 2;
static constexpr ui64 MaxBytesPerMessage = 10 * 1024 * 1024;
TIntrusivePtr<TInterconnectProxyCommon> Common;
std::list<TEventHolder> Cache;
THolder<TEvFreeItems> PendingFreeEvent;
TDestroyCallback DestroyCallback;
public:
TEventHolderPool(TIntrusivePtr<TInterconnectProxyCommon> common,
TDestroyCallback destroyCallback)
: Common(std::move(common))
, DestroyCallback(std::move(destroyCallback))
{}
TEventHolder& Allocate(std::list<TEventHolder>& queue) {
if (Cache.empty()) {
queue.emplace_back();
} else {
queue.splice(queue.end(), Cache, Cache.begin());
}
return queue.back();
}
void Release(std::list<TEventHolder>& queue) {
for (auto it = queue.begin(); it != queue.end(); ) {
Release(queue, it++);
}
}
void Release(std::list<TEventHolder>& queue, std::list<TEventHolder>::iterator event) {
bool trim = false;
// release held event, if any
if (THolder<IEventBase> ev = std::move(event->Event)) {
auto p = GetPendingEvent();
p->NumBytes += event->EventSerializedSize;
auto& events = p->Events;
events.push_back(std::move(ev));
trim = trim || events.size() >= TEvFreeItems::MaxEvents || p->NumBytes >= MaxBytesPerMessage;
}
// release buffer, if any
if (event->Buffer && event->Buffer.RefCount() == 1) {
auto p = GetPendingEvent();
p->NumBytes += event->EventSerializedSize;
auto& buffers = p->Buffers;
buffers.emplace_back(event->Buffer.Release());
trim = trim || buffers.size() >= TEvFreeItems::MaxEvents || p->NumBytes >= MaxBytesPerMessage;
}
// free event and trim the cache if its size is exceeded
event->Clear();
Cache.splice(Cache.end(), queue, event);
if (Cache.size() >= FreeQueueTrimThreshold) {
auto& freeQueue = GetPendingEvent()->FreeQueue;
auto it = Cache.begin();
std::advance(it, Cache.size() - MaxFreeQueueItems);
freeQueue.splice(freeQueue.end(), Cache, Cache.begin(), it);
trim = true;
}
// release items if we have hit the limit
if (trim) {
Trim();
}
}
void Trim() {
if (auto ev = std::move(PendingFreeEvent); ev && ev->GetInLineForDestruction(Common)) {
DestroyCallback(std::move(ev));
}
// ensure it is dropped
PendingFreeEvent.Reset();
}
private:
TEvFreeItems* GetPendingEvent() {
if (!PendingFreeEvent) {
PendingFreeEvent.Reset(new TEvFreeItems);
}
return PendingFreeEvent.Get();
}
};
}
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