namespace formgen.ioc
{

	/**
	 */
	export class trait_notification<type_value>
	{
		
		/**
		 */
		private handlers : Array<type_handler<type_value>>;


		/**
		 */
		public constructor(
			handlers : Array<type_handler<type_value>>
		)
		{
			this.handlers = handlers;
		}


		/**
		 */
		public listen(
			handler : type_handler<type_value>
		) : void
		{
			this.handlers.push(handler);
		}


		/**
		 */
		public async notify(
			value : type_value
		) : Promise<void>
		{
			return (
				Promise.all<void>(
					this.handlers.map(
						handler => handler(value)
					)
				)
				.then(
					() => Promise.resolve<void>(undefined)
				)
			);
		}

	}

}