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Side by Side Diff: base/logging.h

Issue 2034393004: Allow multiple logging::LogMessage{Handler,Listener}s Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: only keep scoped API Created 4 years, 4 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef BASE_LOGGING_H_ 5 #ifndef BASE_LOGGING_H_
6 #define BASE_LOGGING_H_ 6 #define BASE_LOGGING_H_
7 7
8 #include <stddef.h> 8 #include <stddef.h>
9 9
10 #include <cassert> 10 #include <cassert>
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272 // Dialogs are not shown by default. 272 // Dialogs are not shown by default.
273 BASE_EXPORT void SetShowErrorDialogs(bool enable_dialogs); 273 BASE_EXPORT void SetShowErrorDialogs(bool enable_dialogs);
274 274
275 // Sets the Log Assert Handler that will be used to notify of check failures. 275 // Sets the Log Assert Handler that will be used to notify of check failures.
276 // The default handler shows a dialog box and then terminate the process, 276 // The default handler shows a dialog box and then terminate the process,
277 // however clients can use this function to override with their own handling 277 // however clients can use this function to override with their own handling
278 // (e.g. a silent one for Unit Tests) 278 // (e.g. a silent one for Unit Tests)
279 typedef void (*LogAssertHandlerFunction)(const std::string& str); 279 typedef void (*LogAssertHandlerFunction)(const std::string& str);
280 BASE_EXPORT void SetLogAssertHandler(LogAssertHandlerFunction handler); 280 BASE_EXPORT void SetLogAssertHandler(LogAssertHandlerFunction handler);
281 281
282 // Sets the Log Message Handler that gets passed every log message before 282 // Derive the LogMessageHandler that gets passed every log message before
283 // it's sent to other log destinations (if any). 283 // it's sent to other log destinations (if any).
284 // Returns true to signal that it handled the message and the message 284 class BASE_EXPORT LogMessageHandler {
285 // should not be sent to other log destinations. 285 public:
286 typedef bool (*LogMessageHandlerFunction)(int severity, 286 explicit LogMessageHandler();
grt (UTC plus 2) 2016/07/27 20:38:21 nit: omit "explicit" and make the ctor protected,
wychen 2016/08/01 16:12:26 Done.
287 const char* file, int line, size_t message_start, const std::string& str); 287 // Returns true to signal that it handled the message and the message
288 BASE_EXPORT void SetLogMessageHandler(LogMessageHandlerFunction handler); 288 // should not be sent to other log destinations, including other handlers
289 BASE_EXPORT LogMessageHandlerFunction GetLogMessageHandler(); 289 // added before the current one.
290 virtual bool OnMessage(int severity, const char* file, int line,
291 size_t message_start, const std::string& str) = 0;
292 virtual ~LogMessageHandler();
293 };
294
295 BASE_EXPORT unsigned LogMessageHandlerCountForTesting();
296
297 // Derive the LogMessageListener that gets passed every log message before
298 // it's sent to LogMessageHandler. If hijacking message is not
299 // needed, use this one instead of LogMessageHandler.
300 class BASE_EXPORT LogMessageListener {
301 public:
302 explicit LogMessageListener();
303 virtual void OnMessage(int severity, const char* file, int line,
grt (UTC plus 2) 2016/07/27 20:38:21 maybe it's simpler to replace this single-method i
grt (UTC plus 2) 2016/07/28 06:28:48 I see that this is counter to Brett's suggestion,
wychen 2016/08/01 16:12:25 CallbackList handles thread safety nicely, and I t
wychen 2016/08/01 16:12:25 Done.
304 size_t message_start, const std::string& str) = 0;
305 virtual ~LogMessageListener();
306 };
307
308 BASE_EXPORT unsigned LogMessageListenerCountForTesting();
290 309
291 typedef int LogSeverity; 310 typedef int LogSeverity;
292 const LogSeverity LOG_VERBOSE = -1; // This is level 1 verbosity 311 const LogSeverity LOG_VERBOSE = -1; // This is level 1 verbosity
293 // Note: the log severities are used to index into the array of names, 312 // Note: the log severities are used to index into the array of names,
294 // see log_severity_names. 313 // see log_severity_names.
295 const LogSeverity LOG_INFO = 0; 314 const LogSeverity LOG_INFO = 0;
296 const LogSeverity LOG_WARNING = 1; 315 const LogSeverity LOG_WARNING = 1;
297 const LogSeverity LOG_ERROR = 2; 316 const LogSeverity LOG_ERROR = 2;
298 const LogSeverity LOG_FATAL = 3; 317 const LogSeverity LOG_FATAL = 3;
299 const LogSeverity LOG_NUM_SEVERITIES = 4; 318 const LogSeverity LOG_NUM_SEVERITIES = 4;
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994 #elif NOTIMPLEMENTED_POLICY == 5 1013 #elif NOTIMPLEMENTED_POLICY == 5
995 #define NOTIMPLEMENTED() do {\ 1014 #define NOTIMPLEMENTED() do {\
996 static bool logged_once = false;\ 1015 static bool logged_once = false;\
997 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\ 1016 LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\
998 logged_once = true;\ 1017 logged_once = true;\
999 } while(0);\ 1018 } while(0);\
1000 EAT_STREAM_PARAMETERS 1019 EAT_STREAM_PARAMETERS
1001 #endif 1020 #endif
1002 1021
1003 #endif // BASE_LOGGING_H_ 1022 #endif // BASE_LOGGING_H_
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