stop(callback) {
		process.nextTick(() => {
			this.halt();
			if (callback)
				callback();
		});
	}
/**
	 * Cancel the running task
	 *
	 * @param {Function} callback
	 */
Cancel the running task
@param {Function} callback
Cancel the running task @param { Function } callback
stop(callback) {
		process.nextTick(() => {
			this.halt();
			if (callback)
				callback();
		});
	}
stop ( callback ) { process . nextTick ( ( ) => { this . halt ( ) ; if ( callback ) callback ( ) ; } ) ; }
Cancel the running task
 @param {Function} callback
Cancel the running task @param { Function } callback