MessageSource class abstract

Interface for resolving messages, with support for parameterization and internationalization.

This is the main interface that applications will use to retrieve localized messages. It provides a clean API for message resolution with placeholder substitution and locale fallback support.

Example usage:

final messageSource = ConfigurableMessageSource();

// Get a simple message
final greeting = messageSource.getMessage('greeting');

// Get a message with parameters
final welcome = messageSource.getMessage('welcome', args: ['John']);

// Get a message for a specific locale
final bonjour = messageSource.getMessage('greeting', locale: Locale('fr'));