Logo ROOT  
Reference Guide
RLogger.hxx
Go to the documentation of this file.
1/// \file ROOT/TLogger.h
2/// \ingroup Base ROOT7
3/// \author Axel Naumann <axel@cern.ch>
4/// \date 2015-03-29
5/// \warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback
6/// is welcome!
7
8/*************************************************************************
9 * Copyright (C) 1995-2015, Rene Brun and Fons Rademakers. *
10 * All rights reserved. *
11 * *
12 * For the licensing terms see $ROOTSYS/LICENSE. *
13 * For the list of contributors see $ROOTSYS/README/CREDITS. *
14 *************************************************************************/
15
16#ifndef ROOT7_RLogger
17#define ROOT7_RLogger
18
19#include <array>
20#include <memory>
21#include <sstream>
22#include <vector>
23
24#include "ROOT/RStringView.hxx"
25
26namespace ROOT {
27namespace Experimental {
28
29/**
30 Kinds of diagnostics.
31 */
32enum class ELogLevel {
33 kDebug, ///< Debug information; only useful for developers
34 kInfo, ///< Informational messages; used for instance for tracing
35 kWarning, ///< Warnings about likely unexpected behavior
36 kError,
37 kFatal
38};
39
40class RLogEntry;
41
42/**
43 Abstract RLogHandler base class. ROOT logs everything from info to error
44 to entities of this class.
45 */
47public:
48 virtual ~RLogHandler();
49 /// Emit a log entry.
50 /// \param entry - the RLogEntry to be emitted.
51 /// \returns false if further emission of this Log should be suppressed.
52 ///
53 /// \note This function is called concurrently; log emission must be locked
54 /// if needed. (The default log handler using ROOT's DefaultErrorHandler is locked.)
55 virtual bool Emit(const RLogEntry &entry) = 0;
56};
57
58
59/**
60 A RLogHandler that multiplexes diagnostics to different client `RLogHandler`s.
61 `RLogHandler::Get()` returns the process's (static) log manager.
62 */
63
64class RLogManager: public RLogHandler {
65private:
66 std::vector<std::unique_ptr<RLogHandler>> fHandlers;
67
68 long long fNumWarnings{0};
69 long long fNumErrors{0};
70
71 /// Initialize taking a RLogHandlerDefault.
72 RLogManager(std::unique_ptr<RLogHandler> &&lh) { fHandlers.emplace_back(std::move(lh)); }
73
74public:
75 static RLogManager &Get();
76
77 /// Add a RLogHandler in the front - to be called before all others.
78 void PushFront(std::unique_ptr<RLogHandler> handler) { fHandlers.insert(fHandlers.begin(), std::move(handler)); }
79
80 /// Add a RLogHandler in the back - to be called after all others.
81 void PushBack(std::unique_ptr<RLogHandler> handler) { fHandlers.emplace_back(std::move(handler)); }
82
83 // Emit a `RLogEntry` to the RLogHandlers.
84 // Returns false if further emission of this Log should be suppressed.
85 bool Emit(const RLogEntry &entry) override
86 {
87 for (auto &&handler: fHandlers)
88 if (!handler->Emit(entry))
89 return false;
90 return true;
91 }
92
93 /// Returns the current number of warnings seen by this log manager.
94 long long GetNumWarnings() const { return fNumWarnings; }
95
96 /// Returns the current number of errors seen by this log manager.
97 long long GetNumErrors() const { return fNumErrors; }
98};
99
100/**
101 Object to count the number of warnings and errors emitted by a section of code,
102 after construction of this type.
103 */
105private:
106 /// The number of the RLogManager's emitted warnings at construction time of *this.
108 /// The number of the RLogManager's emitted errors at construction time.
110
111public:
112 /// Get the number of warnings that the RLogManager has emitted since construction of *this.
114
115 /// Get the number of errors that the RLogManager has emitted since construction of *this.
117
118 /// Whether the RLogManager has emitted a warnings since construction time of *this.
120
121 /// Whether the RLogManager has emitted an error since construction time of *this.
122 bool HasErrorOccurred() const { return GetAccumulatedErrors(); }
123
124 /// Whether the RLogManager has emitted an error or a warning since construction time of *this.
126};
127
128/**
129 A diagnostic, emitted by the RLogManager upon destruction of the RLogEntry.
130 One can construct a RLogEntry through the utility preprocessor macros R__ERROR_HERE, R__WARNING_HERE etc
131 like this:
132 R__INFO_HERE("CodeGroupForInstanceLibrary") << "All we know is " << 42;
133 This will automatically capture the current class and function name, the file and line number.
134 */
135
136class RLogEntry: public std::ostringstream {
137public:
138 std::string fGroup;
139 std::string fFile;
140 std::string fFuncName;
141 int fLine = 0;
143
144public:
145 RLogEntry() = default;
148 : fGroup(group), fFile(filename), fFuncName(funcname), fLine(line), fLevel(level)
149 {}
150
151 RLogEntry &SetFile(const std::string &file)
152 {
153 fFile = file;
154 return *this;
155 }
156 RLogEntry &SetFunction(const std::string &func)
157 {
158 fFuncName = func;
159 return *this;
160 }
162 {
163 fLine = line;
164 return *this;
165 }
166
168};
169
170} // namespace Experimental
171} // namespace ROOT
172
173#if defined(_MSC_VER)
174#define R__LOG_PRETTY_FUNCTION __FUNCSIG__
175#else
176#define R__LOG_PRETTY_FUNCTION __PRETTY_FUNCTION__
177#endif
178
179#define R__LOG_HERE(LEVEL, GROUP) \
180 ROOT::Experimental::RLogEntry(LEVEL, GROUP).SetFile(__FILE__).SetLine(__LINE__).SetFunction(R__LOG_PRETTY_FUNCTION)
181
182#define R__FATAL_HERE(GROUP) R__LOG_HERE(ROOT::Experimental::ELogLevel::kFatal, GROUP)
183#define R__ERROR_HERE(GROUP) R__LOG_HERE(ROOT::Experimental::ELogLevel::kError, GROUP)
184#define R__WARNING_HERE(GROUP) R__LOG_HERE(ROOT::Experimental::ELogLevel::kWarning, GROUP)
185#define R__INFO_HERE(GROUP) R__LOG_HERE(ROOT::Experimental::ELogLevel::kInfo, GROUP)
186#define R__DEBUG_HERE(GROUP) R__LOG_HERE(ROOT::Experimental::ELogLevel::kDebug, GROUP)
187
188#endif
const Int_t kError
Definition: TError.h:39
const Int_t kFatal
Definition: TError.h:42
const Int_t kWarning
Definition: TError.h:38
const Int_t kInfo
Definition: TError.h:37
Object to count the number of warnings and errors emitted by a section of code, after construction of...
Definition: RLogger.hxx:104
long long GetAccumulatedWarnings() const
Get the number of warnings that the RLogManager has emitted since construction of *this.
Definition: RLogger.hxx:113
bool HasErrorOrWarningOccurred() const
Whether the RLogManager has emitted an error or a warning since construction time of *this.
Definition: RLogger.hxx:125
long long GetAccumulatedErrors() const
Get the number of errors that the RLogManager has emitted since construction of *this.
Definition: RLogger.hxx:116
long long fInitialWarnings
The number of the RLogManager's emitted warnings at construction time of *this.
Definition: RLogger.hxx:107
long long fInitialErrors
The number of the RLogManager's emitted errors at construction time.
Definition: RLogger.hxx:109
bool HasWarningOccurred() const
Whether the RLogManager has emitted a warnings since construction time of *this.
Definition: RLogger.hxx:119
bool HasErrorOccurred() const
Whether the RLogManager has emitted an error since construction time of *this.
Definition: RLogger.hxx:122
A diagnostic, emitted by the RLogManager upon destruction of the RLogEntry.
Definition: RLogger.hxx:136
RLogEntry(ELogLevel level, std::string_view group, std::string_view filename, int line, std::string_view funcname)
Definition: RLogger.hxx:147
RLogEntry & SetLine(int line)
Definition: RLogger.hxx:161
RLogEntry & SetFunction(const std::string &func)
Definition: RLogger.hxx:156
RLogEntry(ELogLevel level, std::string_view group)
Definition: RLogger.hxx:146
RLogEntry & SetFile(const std::string &file)
Definition: RLogger.hxx:151
Abstract RLogHandler base class.
Definition: RLogger.hxx:46
virtual bool Emit(const RLogEntry &entry)=0
Emit a log entry.
A RLogHandler that multiplexes diagnostics to different client RLogHandlers.
Definition: RLogger.hxx:64
RLogManager(std::unique_ptr< RLogHandler > &&lh)
Initialize taking a RLogHandlerDefault.
Definition: RLogger.hxx:72
long long GetNumWarnings() const
Returns the current number of warnings seen by this log manager.
Definition: RLogger.hxx:94
static RLogManager & Get()
Definition: RLogger.cxx:54
std::vector< std::unique_ptr< RLogHandler > > fHandlers
Definition: RLogger.hxx:66
bool Emit(const RLogEntry &entry) override
Emit a log entry.
Definition: RLogger.hxx:85
void PushFront(std::unique_ptr< RLogHandler > handler)
Add a RLogHandler in the front - to be called before all others.
Definition: RLogger.hxx:78
long long GetNumErrors() const
Returns the current number of errors seen by this log manager.
Definition: RLogger.hxx:97
void PushBack(std::unique_ptr< RLogHandler > handler)
Add a RLogHandler in the back - to be called after all others.
Definition: RLogger.hxx:81
TLine * line
basic_string_view< char > string_view
ELogLevel
Kinds of diagnostics.
Definition: RLogger.hxx:32
@ kDebug
Debug information; only useful for developers.
VSD Structures.
Definition: StringConv.hxx:21
Definition: file.py:1