ubuntu-phone team mailing list archive

[Thomas Voß <thomas.voss@xxxxxxxxxxxxx>]

Please also see:

  https://blueprints.launchpad.net/ubuntu/+spec/client-1303-add-app-model-and-lifecycle-to-platform-api

and the linked documents for further details.

  Thomas

On Wed, Aug 14, 2013 at 10:33 AM, Thomas Voß <thomas.voss@xxxxxxxxxxxxx> wrote:
> The state of an application is transparent to the user. Behind the
> scenes, the system can decide to stop/kill non-focused apps at its own
> discretion. Whenever the system alters the state of an app to "not
> running" it offers an archive such that the app can persist its state.
> With that, a user ideally never realizes that an app has been stopped
> or killed.
>
> Thomas
>
>
>
> On Wed, Aug 14, 2013 at 10:08 AM, Tobias Havla <tbhavla@xxxxxxxxx> wrote:
>> On 14.08.2013 10:04, Thomas Voß wrote:
>>> On Wed, Aug 14, 2013 at 9:56 AM, Tobias Havla <tbhavla@xxxxxxxxx> wrote:
>>>> On 14.08.2013 09:54, Thomas Voß wrote:
>>>>> On Wed, Aug 14, 2013 at 9:41 AM, Michael Zanetti
>>>>> <michael.zanetti@xxxxxxxxxxxxx> wrote:
>>>>>> On Wednesday 14 August 2013 09:31:31 Daniel Holbach wrote:
>>>>>>> Hello,
>>>>>>>
>>>>>>> On 14.08.2013 09:29, Michael Zanetti wrote:
>>>>>>>> On Wednesday 14 August 2013 09:07:52 Thomas Voß wrote:
>>>>>>>>> Hey Fabio,
>>>>>>>>>
>>>>>>>>> no, applications are not allowed to run in background. Our application
>>>>>>>>> lifecycle is strict in this respect and we only guarantee focused
>>>>>>>>> applications to be running.
>>>>>>>> Does that mean I will have an Ubuntu Edge phone with 4GB of RAM, 8 CPU
>>>>>>>> cores and cannot do multitasking on it?
>>>>>>> I don't think anyone specified the phone to have 8 CPU cores - where did
>>>>>>> you read that?
>>>>>> Nowhere... I think you get my point...
>>>>>>
>>>>>>> How is "app authors can write daemons" = multitasking?
>>>>>> How does this relate? Thomas said there will be no running apps in the
>>>>>> background / minimzed apps, which to me means there will be no multitasking.
>>>>>>
>>>>>>
>>>>> We have had this conversation multiple times in the past, and version
>>>>> 1 of our application lifecycle will not allow to run arbitrary
>>>>> applications in the background. Instead, we will provide selected
>>>>> services to hand over to the system for certain tasks, e.g.,
>>>>> downloads, alarms, music playback. Please note that this is a policy
>>>>> targetted towards the "mobile phone" usage scenario and swapping
>>>>> policies at runtime when transitioning to different usage scenarios is
>>>>> one of the primary goals of the lifecycle architecture.
>>>>>
>>>>> Version 2 of the lifecycle will then allow applications to run their
>>>>> own background tasks, UI less, with restrictions on
>>>>> CPU/Memory/resources in general.
>>>>>
>>>>> Thomas
>>>>>
>>>>>> --
>>>>>> Mailing list: https://launchpad.net/~ubuntu-phone
>>>>>> Post to     : ubuntu-phone@xxxxxxxxxxxxxxxxxxx
>>>>>> Unsubscribe : https://launchpad.net/~ubuntu-phone
>>>>>> More help   : https://help.launchpad.net/ListHelp
>>>> If Ubuntu Touch doesn't support multi task it is far behind iOS,
>>>> Android, Windows Phone and Blackberry. Sorry, I thought it would be a
>>>> modern system that requires a lot of power, so we can do the same things
>>>> as on our PCs.
>>> Okay, let's be clear here: Multitasking and application lifecycle are
>>> related but distinct topics. Obviously, Ubuntu Touch will support
>>> multi-tasking, but an application lifecycle architecture that allows
>>> for controlling resource consumption of applications by the system is
>>> sorely needed to ensure a long-running _mobile_ device. It is not
>>> sufficient to assume that app authors will get it right and it is
>>> important to note that users always "blame" the platform for bad
>>> battery life. And that is for a good reason: It's the platform's/OS's
>>> responsibility to put mechanisms in place to manage a device's
>>> resources!
>>>
>>> Our application lifecycle policies and state machines allow us to
>>> exercise this level of control for specific usage scenarios, but they
>>> do not touch on general multi-tasking capabilities and we can leverage
>>> the full process state spectrum to ensure a seamless operation.
>>>
>>>   Thomas
>> So can two or three applications run at the same time and other gets
>> closed/suspended or can I switch between two applications only with
>> reloading the application?
>> We have a gesture to quick switch between apps, so if we have to reload
>> apps while we are multitasking this gesture makes no sense. A good way
>> would be suspending apps like Android does (/Greenify). The doesn't
>> notice that and the battery life is good.