How to reuse HTTP request with retry logic in AngularJS - ajax

Question

Is it possible to execute the same HTTP request more than once in AngularJS? i.e. without re-defining the same request twice?
var retry = false;
var req = $http.get( 'ajax.php?a=StartSession&ref=' + code );
req.success(function(res) {
alert(res);
});
req.error( function(res) {
if(retry == false)
//run request again req.get(); ?
retry = true;
});

Answer 1

The previous answer is good in terms of reusing it as service. But it looks like you really want to abstract out the retry logic as well. Here is how i would do that.
app.service('SessionService', ['$http', '$q', function($http, $q){
var _this = this;
var _maxRetryCount = 5; //Just have a maxRetryCount
this.StartSession = function (code, retries){
//if you dont pass retry take the maxretryCount
retries = angular.isUndefined(retries) ? _maxRetryCount : retries;
return $http.get('ajax.php?a=StartSession&ref=' + code)
.then(function(result) {
//process and return the result
return result.data;
}, function (errorResponse) {
//If retries left decrement count and make the call again.
if(retries) {
return _this.StartSession(code, --retries); //here we are returning the promise
}
//All tried done Now Fail or return some data
return $q.reject('oops failed after retries');
});
}
}]);
And just inject SessionService anywhere say in yourcontroller:-
SessionService.StartSession(code).then(function(result){
//handle Result
}).catch(function(){
//handle fail condition
});
Plnkr

Answer 2

It's what services and factories were made for:
app.factory("dataFactory", ["$http", function($http) {
return {
call: function(code) {
return $http.get( 'ajax.php?a=StartSession&ref=' + code )
}
}
}]);
Inject and use
app.controller("myCtrl", ["dataFactory", function(dataFactory) {
var code = "myCode";
dataFactory.call(code).success(function(res) {
//gotcha
});
}]);