[Aerogear-users] Unclear when to use setContentAvailable()
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[Aerogear-users] Unclear when to use setContentAvailable()
 
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Hi, We now seem to have something approaching a stable and working UPS configuration. (Famous last words!) Thanks to the Aerogear team for helping resolve the background notifications on Android. As we are tidying up, we noticed (ahem) that we had commented out a few lines in our code. We went back to the Aerogear docs and tried to work out what setContentAvailable really does and what should we do with it. The docs for the function call are a little sparse, so we looked at the source code and we’re still no wiser. Is there a better explanation of when we should call setContentAvailable and with which parameter? Just to set the ball rolling we think it could mean that when you receive the content-available = 1 flag on iOS, we do a call to get some data from the server ourselves, if the the results of our server call indicate that we have received new data, we set the value to setContentAvailable to 1, if our function call to the server has no data, then we set it to zero and if something failed we set it to 2. So what happens if the value is 0, 1 or 2? if its 2, is a new new call made to something, if its 0 or 1 what happens? Apologies if we’ve missed the point of it, but we’re struggling to understand this. Thanks, Rob. _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
Re: [Aerogear-users] Unclear when to use setContentAvailable()
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Hi, it's an iOS feature, that you can use for having the app download something (or check state on your backend), before the alert is being made visible to the end-user: Also (more interesting, I think) you can use it to send a slient message to the device. E.g. when the app runs (fore/background) the callback is invoked. You can use that to check state on your own backend (a 30 second time window, you have for this), and if needed you could use that to, for instance, issue something local e.g. local notifications (those are better and more handy for several reasons e.g. better control of the badge icon): HTH, Matthias On Thu, Dec 3, 2015 at 7:01 PM, Rob Willett <[hidden email]> wrote:
Matthias Wessendorf
blog: http://matthiaswessendorf.wordpress.com/ sessions: http://www.slideshare.net/mwessendorf twitter: http://twitter.com/mwessendorf _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
Re: [Aerogear-users] Unclear when to use setContentAvailable()
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Matthia,
Thanks for this. Are you referring to content-available flag or the setContentAvailable function? We already send silent notifications out to our Android and Apple devices and the devices handle these correctly. Our logic goes that we send a silent notification to the device via UPS, the device then connects to the server and pulls some data from the server. If our app is in the foreground, we set a tiny alert in the top left of the screen telling the user that something is ready for them, if our app is in the background we set a notification up in the drawer using a local-notification plugin, if the app is not started then the fact the app has not pulled data from the server acts as a flag and we then send down full notifications to the device. The local-notifications and the ‘full fat’ notifications all work the same way when the user clicks on them. We have all of this is working now without setContentAvailable. Its much as you outlined below. I have two phones on my desk as we speak, an Apple and an Android and we are comparing how the notifications look as we ping different data down to them in different situations. We’re down to design looks now rather than programming :) We’re just trying to work out how setContentAvailable fits into all of this, because we aren’t using it at all! Should we be? Rob On 3 Dec 2015, at 18:23, Matthias Wessendorf wrote: > Hi, > > it's an iOS feature, that you can use for having the app download > something > (or check state on your backend), before the alert is being made > visible to > the end-user: > https://developer.xamarin.com/guides/ios/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/updating_an_application_in_the_background/#Remote_Notifications_iOS_7_and_Greater > > > Also (more interesting, I think) you can use it to send a slient > message to > the device. E.g. when the app runs (fore/background) the callback is > invoked. You can use that to check state on your own backend (a 30 > second > time window, you have for this), and if needed you could use that to, > for > instance, issue something local e.g. local notifications (those are > better > and more handy for several reasons e.g. better control of the badge > icon): > https://developer.xamarin.com/guides/ios/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/updating_an_application_in_the_background/#Silent_Remote_Notifications > > HTH, > Matthias > > > On Thu, Dec 3, 2015 at 7:01 PM, Rob Willett > <[hidden email]> > wrote: > >> Hi, >> >> We now seem to have something approaching a stable and working UPS >> configuration. (Famous last words!) Thanks to the Aerogear team for >> helping >> resolve the background notifications on Android. >> >> As we are tidying up, we noticed (ahem) that we had commented out a >> few >> lines in our code. >> >> if (event['content-available']) >> { >> // Still not clear what to do with this. >> // push.setContentAvailable(1); >> } >> >> We went back to the Aerogear docs and tried to work out what >> setContentAvailable really does and what should we do with it. The >> docs for >> the function call are a little sparse, so we looked at the source >> code and >> we’re still no wiser. >> >> Is there a better explanation of when we should call >> setContentAvailable >> and with which parameter? >> >> Just to set the ball rolling we *think* it could mean that when you >> receive the content-available = 1 flag on iOS, we do a call to get >> some >> data from the server ourselves, if the the results of *our* server >> call >> indicate that we have received new data, we set the value to >> setContentAvailable to 1, if our function call to the server has no >> data, >> then we set it to zero and if something failed we set it to 2. >> >> So what happens if the value is 0, 1 or 2? if its 2, is a new new >> call >> made to something, if its 0 or 1 what happens? >> >> Apologies if we’ve missed the point of it, but we’re struggling >> to >> understand this. >> >> Thanks, >> >> Rob. >> >> _______________________________________________ >> Aerogear-users mailing list >> [hidden email] >> https://lists.jboss.org/mailman/listinfo/aerogear-users >> >> > > > -- > Matthias Wessendorf > > blog: http://matthiaswessendorf.wordpress.com/ > sessions: http://www.slideshare.net/mwessendorf > twitter: http://twitter.com/mwessendorf > _______________________________________________ > Aerogear-users mailing list > [hidden email] > https://lists.jboss.org/mailman/listinfo/aerogear-users _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
Re: [Aerogear-users] Unclear when to use setContentAvailable()
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yeah, I meant the flag. Glad it works for you.
I am actually over asked on the client setContentAvailable(). We have the same in our java sender, but that triggers the flag ;) On Thursday, 3 December 2015, Rob Willett <[hidden email]> wrote: Matthia, -- Sent from Gmail Mobile _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
Re: [Aerogear-users] Unclear when to use setContentAvailable()
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Hi Rob, I think we talked about this before, but the silent (content-available) notifications are scheduled by iOS, e.g. there are some heuristic involved. And they are coupled to background content fetching, so when your app receives a 'content-available' silent notification it has 30 seconds to act and afterwards it has to inform the os of the result. That is what this function is for, then the os can use this information along with how often it's used to schedule the next invocation. I agree we have a bit sparse documentation [1]. And also what apple writes is a bit sparse [2]. But you must set this result otherwise your app might not get invoked anymore. In the js api there is an enum with possible values that you can use [3] On Fri, Dec 4, 2015 at 8:24 AM, Matthias Wessendorf <[hidden email]> wrote: yeah, I meant the flag. Glad it works for you. Cheers, Erik Jan _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
Re: [Aerogear-users] Unclear when to use setContentAvailable()
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Erik, Matthias,
Thanks for the comments and help. I *think* we understand now what to do with setContentAvailable. 1. We get the silent notification telling the app that data is available,. This is through the content-available flag - Working in our app. 2. We use the silent notification to go get some more data (typically in our case around 4-5KB) through an XHR call - Working in our app. 3 When we have got the data from our server and we have processed the data, we call push.setContentAvailable with either NewData, NoData or Failed as a parameter. This tells iOS that our background execution is all down with and iOS can do whatever else it needs to - We have just added this logic (well a single line) to our app at the end of our functions, GetNotificationsFromServerSuccess() and GetNotificationsFromServerFailure(). We have imaginative names on our project :) We have read the docs you supplied and quite a lot of others, including other 3rd party push providers to try and understand it. Since everything was working at our end without push.setContentAvailable() we were puzzled as to its importance. So all the push.setContentAvailable does is tell IOS we are finished with background execution, and the parameter is the result of that background execution? Its a tidy up function for iOS background execution. Thanks, Rob On 4 Dec 2015, at 8:03, Erik Jan de Wit wrote: > Hi Rob, > > I think we talked about this before, but the silent > (content-available) > notifications are scheduled by iOS, e.g. there are some heuristic > involved. > And they are coupled to background content fetching, so when your app > receives a 'content-available' silent notification it has 30 seconds > to act > and afterwards it has to inform the os of the result. That is what > this > function is for, then the os can use this information along with how > often > it's used to schedule the next invocation. I agree we have a bit > sparse > documentation [1]. And also what apple writes is a bit sparse [2]. But > you > must set this result otherwise your app might not get invoked anymore. > In > the js api there is an enum with possible values that you can use [3] > > [1] > https://aerogear.org/docs/guides/aerogear-cordova/AerogearCordovaPush/#_ios_background_notification > [2] > https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html > [3] > https://github.com/aerogear/aerogear-cordova-push/blob/master/www/aerogear-push.js#L26-L36 > > On Fri, Dec 4, 2015 at 8:24 AM, Matthias Wessendorf > <[hidden email]> > wrote: > >> yeah, I meant the flag. Glad it works for you. >> >> I am actually over asked on the client setContentAvailable(). >> >> >> We have the same in our java sender, but that triggers the flag ;) >> >> >> On Thursday, 3 December 2015, Rob Willett >> <[hidden email]> >> wrote: >> >>> Matthia, >>> >>> Thanks for this. Are you referring to content-available flag or the >>> setContentAvailable function? >>> >>> We already send silent notifications out to our Android and Apple >>> devices and the devices handle these correctly. >>> >>> Our logic goes that we send a silent notification to the device via >>> UPS, >>> the device then connects to the server and pulls some data from the >>> server. If our app is in the foreground, we set a tiny alert in the >>> top >>> left of the screen telling the user that something is ready for >>> them, if >>> our app is in the background we set a notification up in the drawer >>> using a local-notification plugin, if the app is not started then >>> the >>> fact the app has not pulled data from the server acts as a flag and >>> we >>> then send down full notifications to the device. The >>> local-notifications >>> and the ‘full fat’ notifications all work the same way when the >>> user >>> clicks on them. >>> >>> We have all of this is working now without setContentAvailable. Its >>> much >>> as you outlined below. I have two phones on my desk as we speak, an >>> Apple and an Android and we are comparing how the notifications look >>> as >>> we ping different data down to them in different situations. We’re >>> down to design looks now rather than programming :) >>> >>> We’re just trying to work out how setContentAvailable fits into >>> all of >>> this, because we aren’t using it at all! Should we be? >>> >>> Rob >>> >>> On 3 Dec 2015, at 18:23, Matthias Wessendorf wrote: >>> >>>> Hi, >>>> >>>> it's an iOS feature, that you can use for having the app download >>>> something >>>> (or check state on your backend), before the alert is being made >>>> visible to >>>> the end-user: >>>> >>> https://developer.xamarin.com/guides/ios/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/updating_an_application_in_the_background/#Remote_Notifications_iOS_7_and_Greater >>>> >>>> >>>> Also (more interesting, I think) you can use it to send a slient >>>> message to >>>> the device. E.g. when the app runs (fore/background) the callback >>>> is >>>> invoked. You can use that to check state on your own backend (a 30 >>>> second >>>> time window, you have for this), and if needed you could use that >>>> to, >>>> for >>>> instance, issue something local e.g. local notifications (those are >>>> better >>>> and more handy for several reasons e.g. better control of the badge >>>> icon): >>>> >>> https://developer.xamarin.com/guides/ios/application_fundamentals/backgrounding/part_3_ios_backgrounding_techniques/updating_an_application_in_the_background/#Silent_Remote_Notifications >>>> >>>> HTH, >>>> Matthias >>>> >>>> >>>> On Thu, Dec 3, 2015 at 7:01 PM, Rob Willett >>>> <[hidden email]> >>>> wrote: >>>> >>>>> Hi, >>>>> >>>>> We now seem to have something approaching a stable and working UPS >>>>> configuration. (Famous last words!) Thanks to the Aerogear team >>>>> for >>>>> helping >>>>> resolve the background notifications on Android. >>>>> >>>>> As we are tidying up, we noticed (ahem) that we had commented out >>>>> a >>>>> few >>>>> lines in our code. >>>>> >>>>> if (event['content-available']) >>>>> { >>>>> // Still not clear what to do with this. >>>>> // push.setContentAvailable(1); >>>>> } >>>>> >>>>> We went back to the Aerogear docs and tried to work out what >>>>> setContentAvailable really does and what should we do with it. The >>>>> docs for >>>>> the function call are a little sparse, so we looked at the source >>>>> code and >>>>> we’re still no wiser. >>>>> >>>>> Is there a better explanation of when we should call >>>>> setContentAvailable >>>>> and with which parameter? >>>>> >>>>> Just to set the ball rolling we *think* it could mean that when >>>>> you >>>>> receive the content-available = 1 flag on iOS, we do a call to get >>>>> some >>>>> data from the server ourselves, if the the results of *our* server >>>>> call >>>>> indicate that we have received new data, we set the value to >>>>> setContentAvailable to 1, if our function call to the server has >>>>> no >>>>> data, >>>>> then we set it to zero and if something failed we set it to 2. >>>>> >>>>> So what happens if the value is 0, 1 or 2? if its 2, is a new new >>>>> call >>>>> made to something, if its 0 or 1 what happens? >>>>> >>>>> Apologies if we’ve missed the point of it, but we’re >>>>> struggling >>>>> to >>>>> understand this. >>>>> >>>>> Thanks, >>>>> >>>>> Rob. >>>>> >>>>> _______________________________________________ >>>>> Aerogear-users mailing list >>>>> [hidden email] >>>>> https://lists.jboss.org/mailman/listinfo/aerogear-users >>>>> >>>>> >>>> >>>> >>>> -- >>>> Matthias Wessendorf >>>> >>>> blog: http://matthiaswessendorf.wordpress.com/ >>>> sessions: http://www.slideshare.net/mwessendorf >>>> twitter: http://twitter.com/mwessendorf >>>> _______________________________________________ >>>> Aerogear-users mailing list >>>> [hidden email] >>>> https://lists.jboss.org/mailman/listinfo/aerogear-users >>> >>> _______________________________________________ >>> Aerogear-users mailing list >>> [hidden email] >>> https://lists.jboss.org/mailman/listinfo/aerogear-users >>> >> >> >> -- >> Sent from Gmail Mobile >> >> _______________________________________________ >> Aerogear-users mailing list >> [hidden email] >> https://lists.jboss.org/mailman/listinfo/aerogear-users >> >> > > > -- > Cheers, > Erik Jan > _______________________________________________ > Aerogear-users mailing list > [hidden email] > https://lists.jboss.org/mailman/listinfo/aerogear-users _______________________________________________ Aerogear-users mailing list [hidden email] https://lists.jboss.org/mailman/listinfo/aerogear-users |
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