blob: 802a73aae90df9acaa9a4acf2c082cc05d4e25d0 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#pragma once
#include <library/cpp/logger/backend.h>
#include <util/generic/ptr.h>
#include <utility>
namespace NYql {
namespace NLog {
/**
* @brief Dispatches all invocations to default logger backend configured
* for current thread. Must be used in conjunction with
* SetLogBackendForCurrentThread() function or TScopedBackend class.
*/
class TTlsLogBackend: public TLogBackend {
public:
TTlsLogBackend(TAutoPtr<TLogBackend> defaultBackend)
: DefaultBackend_(defaultBackend)
{
Y_DEBUG_ABORT_UNLESS(DefaultBackend_, "default backend is not set");
}
void WriteData(const TLogRecord& rec) override;
void ReopenLog() override;
ELogPriority FiltrationLevel() const override;
private:
TAutoPtr<TLogBackend> DefaultBackend_;
};
/**
* @brief Sets given backend as default for current thread. Must be used in
* conjunction with TTlsLogBackend.
*
* @param backend - pointer to logger backend
* @return previous default logger backend
*/
TLogBackend* SetLogBackendForCurrentThread(TLogBackend* backend);
/**
* @brief Sets itself as default for current thread on instantiation
* and restores previous one on destruction. Must be used in
* conjunction with TTlsLogBackend.
*/
template <typename TBackend>
class TScopedBackend: public TBackend {
public:
template <typename... TArgs>
TScopedBackend(TArgs&&... args)
: TBackend(std::forward<TArgs>(args)...)
, PrevBacked_(SetLogBackendForCurrentThread(this))
{
}
~TScopedBackend() {
SetLogBackendForCurrentThread(PrevBacked_);
}
private:
TLogBackend* PrevBacked_;
};
} // namspace NLog
} // namspace NYql
|
