Chaining does not seem to be working

[martheli]

My code is as follows:

  let backgroundBlock = Async.utility {

                    for serial in serialarray

                    {

                   self.getVersion(serial: serial)

                    }

                }

                backgroundBlock.main
                    {
                     print (serialarray)
                     print (versionarray)

                SwiftSpinner.hide()
                }

If I understand this right, getVersion should run in the background until it completes fully and then the second block should run and print out both of my arrays. Instead the first array gets printed but the second array comes up blank. I added a print inside of my getVersion function to see if it was working and I can see all the values being populated so it looks like the block is not waiting to complete before it prints the array out. Am I doing something wrong?

The getVersion function is as follows:

Alamofire.request("url=\(serial)", headers: httpheader).validate().responseData { response in

        switch response.result {

        case .success:

            if let data = response.data {

                let xml = SWXMLHash.parse(data)

                var count: Int = 0

                var stop = false

                for elem in xml["deviceSoftwares"]["deviceSw"].all

                {

                     for elem2 in elem["swAttrs"].all

                     {

                        if stop == false

                        {
                             count += 1

                        if (elem2["value"].element!.text) == "com.fiberlink.maas360.fpl"
                        {
                           stop = true
                        }

                        }

                    }
                }

                let position = (count/5)

                if stop == true

                {
                let version = xml["deviceSoftwares"]["deviceSw"][position]["swAttrs"][2]["value"].element!.text

                    versionarray.append(version)
                }

                else

                {
                    versionarray.append("N/A")

                }

            }

        case .failure(_):

            let errorCode = response.response?.statusCode
            let errorString = String(describing: errorCode!)
            print("Error " + errorString)

        }

        }

[duemunk]

You don’t store the result if getVersion to versionarray.

On 16 Jul 2017, at 09.08, martheli notifications@github.com wrote:

My code is as follows:

let backgroundBlock = Async.utility {

                for serial in serialarray

                {

               self.getVersion(serial: serial)

                }

            }

            backgroundBlock.main
                {
                 print (serialarray)
                 print (versionarray)

            SwiftSpinner.hide()
            }

If I understand this right, getVersion should run in the background until it completes fully and then the second block should run and print out both of my arrays. Instead the first array gets printed but the second array comes up blank. I added a print inside of my getVersion function to see if it was working and I can see all the values being populated so it looks like the block is not waiting to complete before it prints the array out. Am I doing something wrong?

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[martheli]

@duemunk I added the getVersion function to my original post. Versionarray gets populated in the getVersion function.

I also tried the following:

 let group = AsyncGroup()

                group.utility {

                    for serial in serialarray

                    {

                   self.getVersion(serial: serial)

                    }

                }

                group.wait()

                     print (serialarray)
                     print (versionarray)

                   SwiftSpinner.hide()

Both prints are executing before getVersion finishes its loop to populate the array.

[duemunk]

This is not an issue for Async. Please refer to GCD documentation and/or StackOverflow.