javascript - Node.js: Best way to perform multiple async operations, then do something else? -

-

In the following code I am trying to create multiple (about 10) HTTP requests and RSS pars at once.

Code:

I

code> Miscellaneous articles; Feedstofet. Each (function (feed) (feed, function (mistake, feed article) {if (mistake) {throw it;} other {article = articles.concact (feedartics);}});}); // code I want to run once after visiting all the feeds of the url

I understand that while using a callback I used a callback in this example while calling the function The only way to think about doing a call is to call a function that believes that how many times it has been called and continues only when it feedsToFetch.length is hacked.

So my question is, what is the best way to handle this type of situation in node.js .

Possibly without any form of blocking! (I still want that fast speed is fast) Is this promise or something?

Thanks, Danny

hack-free solution

Then do something else) This is the perfect match for your scenario

Bluebird also has .map () which can take an array of values ​​and start a promise chain

Here Bluebird .map () : < pre> var is an example using promise = require ('bluebird'); Var Requests = Promise.promisifyAll (Required ('Request')); Function ProcessFilffeds (Feedstofetch) {Promise.map} (Feedsofoffeach, Function (Feed) {// I changed your 'Feed' FN to 'Processed' Return ProcessFeed (Feed)} Then (function (article) {/ / 'The article' now has an array w / call all the results of 'processes' / something with all the results ...}). (Function (e) {// feed server was down, etc}}} function processfid (Feed) {// // Use the promisified version of 'get' return request.getAsync (feed.url) ...}

Also note that you do not need to use closures here to submit results.

With many examples, really well written So, it is easy to take it

Once I have learned the promise pattern, life has made it so easy. I can not recommend it adequately

Besides, Regarding various approaches to dealing with tasks, as ync module, and others

Hope this helps!

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more