ApplicationRunListener class abstract

A listener for JetLeaf application lifecycle events during startup.

This abstract class can be implemented to hook into specific stages of the application's lifecycle such as environment preparation, context creation, and application readiness.

Implementations are often used to perform logging, initialize external services, configure context properties, or monitor startup performance.

Example

class LoggingRunListener implements ApplicationRunListener {
  @override
  void onStarting(ConfigurableBootstrapContext context) {
    print("Application is starting...");
  }

  @override
  void onReady(ConfigurableApplicationContext context, Duration timeTaken) {
    print("Application ready in ${timeTaken.inMilliseconds}ms");
  }

  @override
  void onFailed(ConfigurableApplicationContext? context, Object exception) {
    print("Application failed to start: $exception");
  }
}