angular-retry

A service for retrying functions on exception

Summary

Every so often, you run across some action, which just fails, where the best response it to just try it again. This is particularly true when dealing with an external source, like a database or web service, which can have network or other temporary problems, which would have cleared up when you repeat the call seconds later.

Often, these actions fail by throwing an exception which makes the process of trying the call again rather cumbersome. Having to deal with this a number of times in one application, I decided to wrap the full procedure up in an angular service, which I share here with you.

The full post is available at : http://thaiat.github.io/blog/2014/03/23/automatic-retry-on-exception-in-angular/

Usage

The service exposes 3 functions

sleep

Equivalent to the .net Thread.Sleep.

Usage:

promiseService.sleep(100).then(...); // sleep for 100 ms

toAsync

Converts a function either sync or async to a promise

Usage:

var fn = function() {
    return "Hello World";
};
promiseService.toAsync(fn).then(...);

retry

Retry on fail either a sync or async function.

Usage:

var options = {
     maxRetry : 3, // number of times to retry on fail
     interval : 500, // interval between retries
     intervalMultiplicator : 1.5 // extend the interval between retries
} 
promiseService.retry(fn, options).then(...); // options is optional