Closing app as a process doesn't run a process

I am using ionic framework. here is my app.js

.state('app.articlelist,{
   cache:false,
   url:"",
and so on..
)

and controller file

.controller('ArticleCtrl',function($scope,getArticle){
  alert("Controller runs");
    getArticle.getAriclefromDb().then(function(res){
      alert("hello test");
   });
});

Which is working fine .

Now i have closed my app and also its process.

Now Second time getArticle.getAriclefromDb().then(function(res){ function doesn't runs.

but second time i am able to see alert Controller runs and first time i am able to see both alerts.

Any idea? why this is happening ?

Thanks