In the cases when you execute any server and your attempts to load a new page view and then your codes in directive gets loaded before your services are updated so you can using $rootScope.
This is an example of above case

View

<service-history log="log" data-ng-repeat="log in requiedData"></service-history>

Controller

app.controller("MyController",['$scope','$rootScope', function($scope, $rootScope) {

   $scope.$on('$viewContentLoaded', function () {
       SomeSerive.getHistory().then(function(data) {
           $scope.requiedData = data;
           $rootScope.$broadcast("history-updation");
       });
  });

}]);

Directive

app.directive("serviceHistory", function() {
    return {
        restrict: 'E',
        replace: true,
        scope: {
           log: '='
        },
        link: function($scope, element, attrs) {
            function updateHistory() {
               if(log) {
                   //do something
               }
            }
            $rootScope.$on("history-updation", updateHistory);
        }
   };
});