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Groups > comp.lang.javascript > #33043

Solved: synchronizing asynchronus request

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Le 18/04/2017 à 00:32, Richard Maher a écrit :
>>
> Could Promises help you here?
>
> https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
>

Yes, u'r right !

I did it in the mean time [test in ES5]:

var promises = [];

var albumsPromise = new Promise(function(resolve, reject){
   var albumsRequest = {database: 'photos', collection: 'albums', mode: 
'read', sort: {startdate: 1, stopdate: 1}};
   socketService.sendRequest(albumsRequest, function (message) {
     resolve({
       albums_delay: ((new Date()).getTime() - start),
       albums_count: message.results.albums.length, albums: 
message.results.albums
     });
   });
});
promises.push(albumsPromise);

the like for cameras, locations, person etc.

and then :

Promise.all(promises).then(function(datas) {

here I have an Array of object, then i re-arrange to a sole object by :

             var data = {promises_count: promises.length};
             for (var i = 0, l = datas.length; i < l; i++) {
               for (var prop in datas[i]) {
                 data[prop] = datas[i][prop];
               }
             }

});

here (ie; with Promise.all) the delay is roughly the longest delay.

I have tested another solution like :

var albumsTrick = function () { return new Promise(blahblahblah);};

and then : albumsTrick.then(camerasTrick)...

in that case, if n is the number of socket requests, the time delay is 
at least n * (a delay roughly 50 ms)

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Thread

synchronizing asynchronus request Une Bévue <unbewusst.sein@fai.invalid> - 2017-04-16 08:30 +0200
  Re: synchronizing asynchronus request Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-16 11:09 +0100
    Re: synchronizing asynchronus request Une Bévue <unbewusst.sein@fai.invalid> - 2017-04-16 18:38 +0200
  Re: synchronizing asynchronus request Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2017-04-18 06:32 +0800
    Solved: synchronizing asynchronus request Une Bévue <unbewusst.sein@fai.invalid> - 2017-04-18 11:58 +0200
      Re: Solved: synchronizing asynchronus request Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2017-04-18 21:39 +0800
        Re: Solved: synchronizing asynchronus request Une Bévue <unbewusst.sein@fai.invalid> - 2017-04-19 07:10 +0200
          Re: Solved: synchronizing asynchronus request "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-19 12:17 +0200

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