angularjs: $timeout usage (inside of service)

angularjs: $timeout usage (inside of service)

I'm trying to make a little notifier, that informs about typical
situations: need authorization, changes saved etc. Notices are shown for 3
seconds and disappear, if user didn't click on it (if notice clicked, it
disappears immediatly). Documentation is not very informative. How should
i use $timeout, to call close(); after 3 seconds? And how can i put a
variable (nId) into function? I tried with closure (*function(){return
function(){}}*) in default setTimeOut(), but unsuccessfully.
myApp.controller('noticesCtrl',
function noticesCtrl($scope, $rootScope, noticesData){
$rootScope.notices = [];
$scope.closeNotice = function(nId){
noticesData.close(nId);
};
});
myApp.factory('noticesData', function($rootScope, $timeout){
return{
add: function(type, text){
var nId = $rootScope.notices.length + 1;
$rootScope.notices.push({id: nId, type:type, text:text+nId});
// call close function with 3sec. delay; how?
},
close: function(nId){
angular.forEach($rootScope.notices, function(notice, key){
if(notice.id == nId){
$rootScope.notices.splice(key,1);
}
});
}
}
});