I agree with Gary, but if something about your structure makes that difficult,
there’s also a queue suspend/resume approach:
let queue = dispatch_queue_create("", DISPATCH_QUEUE_SERIAL)
dispatch_async(queue) {
dispatch_suspend(queue)
myFirstNetworkCall({ (let result) in
dispatch_resume(queue)
})
}
dispatch_async(queue) {
dispatch_suspend(queue)
mySecondNetworkCall({ (let result) in
dispatch_resume(queue)
})
}
Dan
On Jun 28, 2016, at 1:11 PM, Gary L. Wade
<[email protected]<mailto:[email protected]>> 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 protected]> 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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