ios - Best practice to replace a synchronous NSURLConnection with NSURLSession -


as 

nsurlconnection sendsynchronousrequest:returningresponse:error:&connectionerror

is set deprecated have replace importer wrote long time ago.

the importer following:

  1. it fetches data api-a. data there can on multiple pages.
  2. it uses data first fetch (also multipage) query data api-b , merges
  3. results api-b query merged data api-a

i implemented background-operation use methods each api called recursively if there mulitple pages request.

but nsurlsession not support synchronous request see option have lot of overhead (e.g. ivars) control what's called in completion block (e.g. next page or start query api-b).

so, elegant solution bring nsurlsession.

nb: make sure, previous solution not block main thread @ all. easiest way control merge of 2 sources.

this answer not supposed best practice. practical me.

faced situation when bunch of synchronous requests executed in background , order of execution matters i've ended using following:

syncrequestsender.h

#import <foundation/foundation.h>  @interface syncrequestsender : nsobject  + (nsdata *)sendsynchronousrequest:(nsurlrequest *)request                  returningresponse:(nsurlresponse **)response                              error:(nserror **)error;  @end

syncrequestsender.m

#import "syncrequestsender.h"  @implementation syncrequestsender  + (nsdata *)sendsynchronousrequest:(nsurlrequest *)request                  returningresponse:(nsurlresponse **)response                              error:(nserror **)error {     dispatch_group_t group = dispatch_group_create();     dispatch_group_enter(group);       nserror __block *err = null;     nsdata __block *data;     nsurlresponse __block *resp;      [[[nsurlsession sharedsession] datataskwithrequest:request                                      completionhandler:^(nsdata* _data, nsurlresponse* _response, nserror* _error) {         resp = _response;         err = _error;         data = _data;         dispatch_group_leave(group);      }] resume];      dispatch_group_wait(group, dispatch_time_forever);      if (response)     {         *response = resp;     }     if (error)     {         *error = err;     }      return data; }  @end

-

Comments

Post a Comment

Popular posts from this blog

scala - 'wrong top statement declaration' when using slick in IntelliJ -

Image
i'm porting project scala 2.9 2.10, therefore have use slick instead of scalaquery. i'm using slick 2.1.0 since supports ms access. according this tutorial , upgrade guide changed robs object class , added val robs : why error message wrong top statement declaration , how rid of it? edit: i'm new scala... according this question seems can't put val outside of methods or classes, right? code above directly in packge. right approach slick then? should move code in class or trait? according this changed val robs = tablequery[robs] to object robs extends tablequery(new robs(_)) {} . no warnings or errors anymore. :)
Read more

c# - DevExpress.Wpf.Grid.InfiniteGridSizeException was unhandled -

Image
when using devexpress, see error: devexpress.wpf.grid.infinitegridsizeexception unhandled message="by default, infinite grid height not allowed since grid rows rendered , hence grid work slowly. fix issue, should place grid container give finite height grid, or should manually specify grid's height or maxheight. note can avoid exception setting gridcontrol.allowinfinitegridsize static property true, in case grid run slowly." the problem dxgrid has infinite height. to fix, set height non-infinite. snoop absolutely invaluable this: if "height" xaml element infinite (i.e. 0 or nan ), can set using one of following: option 1: height="{binding path=actualheight, relativesource={relativesource mode=findancestor, ancestortype=uielement}}" option 2: verticalalignment="stretch" option 3: height="auto" hint: use verticalalignment="stretch" if child of grid <rowdefinition height=
Read more

PySide and Qt Properties: Connecting signals from Python to QML -

i trying run simple pyside appliccation design made in qml. call function in qml python in separated thread. i have following qml view: import qt 4.7 rectangle { visible: true width: 100; height: 100 color: "lightgrey" text { id: datestr objectname: "datestr" x: 10 y: 10 text: "init text" font.pixelsize: 12 function updatedata(text) { datestr.text = qstr(text) console.log("you said: " + text) } } } here application: some imports.... #!/usr/bin/python import sys import time pyside import qtdeclarative, qtcore pyside.qtgui import qapplication pyside.qtdeclarative import qdeclarativeview the qthread worker.... #worker thread class worker(qtcore.qthread): updateprogress = qtcore.signal(int) def __init__(self, child): qtcore.qthread.__init__(self) self.child = child def run(self):
Read more