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#pragma once
#include "eventlog.h"
#include <util/generic/string.h>
#include <util/thread/pool.h>
class TThreadedEventLog: public TEventLogWithSlave {
public:
class TWrapper;
using TOverflowCallback = std::function<void(TWrapper& wrapper)>;
enum class EDegradationResult {
ShouldWrite,
ShouldDrop,
};
using TDegradationCallback = std::function<EDegradationResult(float fillFactor)>;
public:
TThreadedEventLog(
IEventLog& parentLog,
size_t threadCount,
size_t queueSize,
TOverflowCallback cb,
TDegradationCallback degradationCallback = {})
: TEventLogWithSlave(parentLog)
, LogSaver(TThreadPoolParams().SetThreadName("ThreadedEventLog"))
, ThreadCount(threadCount)
, QueueSize(queueSize)
, OverflowCallback(std::move(cb))
, DegradationCallback(std::move(degradationCallback))
{
Init();
}
TThreadedEventLog(
const TEventLogPtr& parentLog,
size_t threadCount,
size_t queueSize,
TOverflowCallback cb,
TDegradationCallback degradationCallback = {})
: TEventLogWithSlave(parentLog)
, LogSaver(TThreadPoolParams().SetThreadName("ThreadedEventLog"))
, ThreadCount(threadCount)
, QueueSize(queueSize)
, OverflowCallback(std::move(cb))
, DegradationCallback(std::move(degradationCallback))
{
Init();
}
TThreadedEventLog(IEventLog& parentLog)
: TThreadedEventLog(parentLog, 1, 0, TOverflowCallback())
{
}
TThreadedEventLog(const TEventLogPtr& parentLog)
: TThreadedEventLog(parentLog, 1, 0, TOverflowCallback())
{
}
~TThreadedEventLog() override {
try {
LogSaver.Stop();
} catch (...) {
}
}
void ReopenLog() override {
TEventLogWithSlave::ReopenLog();
}
void CloseLog() override {
LogSaver.Stop();
TEventLogWithSlave::CloseLog();
}
void WriteFrame(TBuffer& buffer,
TEventTimestamp startTimestamp,
TEventTimestamp endTimestamp,
TWriteFrameCallbackPtr writeFrameCallback = nullptr,
TLogRecord::TMetaFlags metaFlags = {}) override {
float fillFactor = 0.0f;
if (Y_LIKELY(LogSaver.GetMaxQueueSize() > 0)) {
fillFactor = static_cast<float>(LogSaver.Size()) / LogSaver.GetMaxQueueSize();
}
EDegradationResult status = EDegradationResult::ShouldWrite;
if (DegradationCallback) {
status = DegradationCallback(fillFactor);
}
if (Y_UNLIKELY(status == EDegradationResult::ShouldDrop)) {
return;
}
THolder<TWrapper> wrapped;
wrapped.Reset(new TWrapper(buffer, startTimestamp, endTimestamp, Slave(), writeFrameCallback, std::move(metaFlags)));
if (LogSaver.Add(wrapped.Get())) {
Y_UNUSED(wrapped.Release());
} else if (OverflowCallback) {
OverflowCallback(*wrapped);
}
}
private:
void Init() {
LogSaver.Start(ThreadCount, QueueSize);
}
public:
class TWrapper: public IObjectInQueue {
public:
TWrapper(TBuffer& buffer,
TEventTimestamp startTimestamp,
TEventTimestamp endTimestamp,
IEventLog& slave,
TWriteFrameCallbackPtr writeFrameCallback = nullptr,
TLogRecord::TMetaFlags metaFlags = {})
: StartTimestamp(startTimestamp)
, EndTimestamp(endTimestamp)
, Slave(&slave)
, WriteFrameCallback(writeFrameCallback)
, MetaFlags(std::move(metaFlags))
{
Buffer.Swap(buffer);
}
void Process(void*) override {
THolder<TWrapper> holder(this);
WriteFrame();
}
void WriteFrame() {
Slave->WriteFrame(Buffer, StartTimestamp, EndTimestamp, WriteFrameCallback, std::move(MetaFlags));
}
private:
TBuffer Buffer;
TEventTimestamp StartTimestamp;
TEventTimestamp EndTimestamp;
IEventLog* Slave;
TWriteFrameCallbackPtr WriteFrameCallback;
TLogRecord::TMetaFlags MetaFlags;
};
private:
TThreadPool LogSaver;
const size_t ThreadCount;
const size_t QueueSize;
const TOverflowCallback OverflowCallback;
const TDegradationCallback DegradationCallback;
};
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