Creating asynchronous code in my software project

Question

Creating asynchronous code in my software project

Can you demonstrate how to make this code asynchronous with an example? 1) Retrieve the file using the $http.get function from the server 2) Read the file into an array 3) Process the data (rebuild it) 4) Display a progress bar for each action

Here is the current code:

$http.get(filename).success(function (data) {
     words = data.split(/\n| /);
     reBuild(words) //this operation takes at least 5 seconds
     Process(words) //this operation takes at least 4 seconds
})

I would like to make this code asynchronous so that my thread does not freeze while reBuild and Process are being executed. Any suggestions on how to achieve this?

javascript angularjs asynchronous promise

Answer 1

Answer №1

To ensure that 'Process' can run only after 'reBuild' has completed, one effective approach is to modify the reBuild and Process functions to return promises instead. Promises offer a way to handle asynchronous events in JavaScript - http://docs.angularjs.org/api/ng.$q .

For instance, rather than defining your reBuild method like this:

var reBuild = function(words) {
  // 5 second operation here
  return words;
}

You can refactor it as follows: (Remember to include the $q and $timeout services in your controller)

var reBuild = function(words) {
   var deferred = $q.defer();

   $timeout(function() {
       // perform the 5-second operation
       deferred.resolve(words);
   });

   return deferred.promise;
}

After making these adjustments, you can implement the following in your controller:

$http.get(filename).success(function (data) {
     words = data.split(/\n| /);
     reBuild(words).then(function(reBuiltWords) {
         Process(reBuiltWords);
     }); 
})

Answer 2

To ensure that 'Process' can run only after 'reBuild' has completed, one effective approach is to modify the reBuild and Process functions to return promises instead. Promises offer a way to handle asynchronous events in JavaScript - http://docs.angularjs.org/api/ng.$q .

For instance, rather than defining your reBuild method like this:

var reBuild = function(words) {
  // 5 second operation here
  return words;
}

You can refactor it as follows: (Remember to include the $q and $timeout services in your controller)

var reBuild = function(words) {
   var deferred = $q.defer();

   $timeout(function() {
       // perform the 5-second operation
       deferred.resolve(words);
   });

   return deferred.promise;
}

After making these adjustments, you can implement the following in your controller:

$http.get(filename).success(function (data) {
     words = data.split(/\n| /);
     reBuild(words).then(function(reBuiltWords) {
         Process(reBuiltWords);
     }); 
})

Answer 3

Answer №2

Managing events can be challenging, but a simple solution is to incorporate a setTimeout function to break down the lengthy loop into manageable parts.

Answer 4

Managing events can be challenging, but a simple solution is to incorporate a setTimeout function to break down the lengthy loop into manageable parts.

Creating asynchronous code in my software project

Answer №1

Answer №2

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