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 14:19:37 -0700
That may work, too, but it sure sounds like an awfully heavy way to do it.
--
Gary L. Wade (Sent from my iPhone)
http://www.garywade.com/
> On Jun 28, 2016, at 2:16 PM, Peter Tomaselli <email@hidden> wrote:
>
> In the past I’ve used NSOperation for this — wrap each request in an async NSOperation that only signals completion to its queue when its DataTask completion handler is complete. Then you can blast a bunch of them at a serial queue and they will come out serially until they are done.
>
>> On Tue, Jun 28, 2016 at 4:35 PM, Gary L. Wade <email@hidden> wrote:
>> Try using a mutex on your array of requests, when adding and removing them, and only pull a request off the array when you're done with your completion handler or when you have nothing in progress such as when you first start.
>> --
>> Gary L. Wade (Sent from my iPhone)
>> http://www.garywade.com/
>>
>> > On Jun 28, 2016, at 1:16 PM, Jim Adams <email@hidden> wrote:
>> >
>> > Unfortunately, with a multi threaded system, I cannot figure out a way to do that. Ideas appreciated.
>> >
>> > My network calls could come from any thread. I could see putting the request into a queue, but how to I make the completion handler run on that same queue so it remains blocked?
>> >
>> >> On Jun 28, 2016, at 4:11 PM, Gary L. Wade <email@hidden> 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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