Re: How can I get a single threaded network call in ObjC on iOS?
Re: How can I get a single threaded network call in ObjC on iOS?
- Subject: Re: How can I get a single threaded network call in ObjC on iOS?
- From: "Gary L. Wade" <email@hidden>
- Date: Tue, 28 Jun 2016 15:50:45 -0700
Based on his desire to do this serially, he would need a serial queue, and he's using asynchronous requests, so succeeding calls from his completion handler with a simple array in queue pattern is simpler than shoehorning it all into dispatch queues.
--
Gary L. Wade (Sent from my iPhone)
http://www.garywade.com/
> On Jun 28, 2016, at 3:45 PM, Alex Zavatone <email@hidden> wrote:
>
> Would a dispatch queue get what he's looking for?
>
>> On Jun 28, 2016, at 3:11 PM, Gary L. Wade wrote:
>>
>> The simplest way to do what you're asking is to not send another request until your completion handler finishes.
>> --
>> Gary L. Wade (Sent from my iPhone)
>> http://www.garywade.com/
>>
>>> On Jun 28, 2016, at 12:52 PM, Jim Adams <email@hidden> wrote:
>>>
>>> I have an application that has the requirement that the accesses to the server be single threaded, i.e. the second request cannot go through until the first request has completed. I am using NSURLSession and NSURLSessionDataTask. I have set the Maximum Concurrent Host number in the configuration to 1 but I have seen evidence that there are simultaneous requests going up to my servers.
>>>
>>> Actually I don’t think they are truly simultaneous, just that the completion handler doesn’t finish before the next request goes out. Is there a way to make the next request wait until the completion block is exited?
>>>
>>> My evidence comes from looking in the server logs. I have 3 servers in AWS behind an ELB. If I am able to get the cookies back from the server before sending the next request then my request will go to the same server that the last request went to. If I don’t wait then then the request goes to a random server. If I watch the logs I can see the requests come in on multiple servers.
>>
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