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angular.module('app').controller('TheCtrl', function($scope, NotifyingService) {
    // ... stuff ...
    NotifyingService.subscribe($scope, function somethingChanged() {
        // Handle notification
    });
});

angular.module('app').factory('NotifyingService', function($rootScope) {
    return {
        subscribe: function(scope, event, callback) {
            var handler = $rootScope.$on(event, callback);
            scope.$on('$destroy', handler);
        },

        notify: function(event) {
            $rootScope.$emit(event);
        }
    };
});