LoggingListener class abstract

A listener interface for reacting to logging events within an application.

The TracingListener interface allows you to observe and respond to log messages generated by instances of TracingListener. This is useful for implementing custom log processing, such as writing logs to:

• The console (standard output)
• External log files
• Remote logging services (e.g., Datadog, Sentry)
• In-memory dashboards or UIs

How to Implement

To respond to logs, implement this interface and override onLog:

class ConsoleLogListener implements TracingListener {
  @override
  void onLog(LogLevel level, DateTime timestamp, String message, String tag) {
    print('[$timestamp][$tag][$level] $message');
  }
}

Integration with Logger Factory

Register the listener with a logger:

final logger = MyLoggerFactory("DatabaseService");
logger.registerListener(ConsoleLogListener());

logger.add(LogLevel.info, "Database connection established.");

This enables a plug-and-play model where multiple listeners can be registered and independently respond to log events.