55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
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#include "quill/Backend.h"
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#include "quill/Frontend.h"
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#include "quill/LogMacros.h"
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#include "quill/Logger.h"
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#include "quill/sinks/ConsoleSink.h"
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#include <utility>
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/**
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* This example showcases the usage of LOG_BACKTRACE macros. Log messages generated using these
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* macros are enqueued from the frontend to the backend. However, the backend will only log them if
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* a specific condition is met or if they are manually flushed using flush_backtrace().
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*/
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int main()
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{
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// Start the backend thread
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quill::BackendOptions backend_options;
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quill::Backend::start(backend_options);
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// Frontend
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auto console_sink = quill::Frontend::create_or_get_sink<quill::ConsoleSink>("sink_id_1");
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quill::Logger* logger = quill::Frontend::create_or_get_logger("root", std::move(console_sink));
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logger->set_log_level(quill::LogLevel::Debug);
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// Enable the backtrace with a ring buffer capacity of 2 messages to get flushed when
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// a LOG_ERROR(...) or higher severity log message occurs via this logger.
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// Backtrace has to be enabled only once in the beginning before calling LOG_BACKTRACE(...) for the first time.
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logger->init_backtrace(2u, quill::LogLevel::Error);
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LOG_INFO(logger, "Begin example {}", 1);
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LOG_BACKTRACE(logger, "Backtrace log {}", 1);
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LOG_BACKTRACE(logger, "Backtrace log {}", 2);
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LOG_BACKTRACE(logger, "Backtrace log {}", 3);
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LOG_BACKTRACE(logger, "Backtrace log {}", 4);
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LOG_INFO(logger, "Backtrace is not flushed yet as we requested to flush on errors {}", 1);
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// log message with severity error - This will also flush the backtrace which has 2 messages
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LOG_ERROR(logger, "An error has happened, Backtrace is also flushed.");
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// The backtrace is flushed again after LOG_ERROR but in this case it is empty
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LOG_ERROR(logger,
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"Another second error has happened, backtrace is flushed again but it is now empty.");
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// Log more backtrace messages
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LOG_BACKTRACE(logger, "Another Backtrace log {}", 1);
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LOG_BACKTRACE(logger, "Another Backtrace log {}", 2);
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LOG_DEBUG(logger, "No backtrace logs yet");
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LOG_INFO(logger, "Manually flush backtrace");
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logger->flush_backtrace();
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}
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