dbus Digest, Vol 81, Issue 3

Mon Apr 9 10:04:00 PDT 2012

Hello, 

Thanks for your reply Thiago. Although you are right that a readable property has to be valid always. I am in situation where it's not. Working with legacy code here with minimal redesign allowed. 

In my case it's an object-path type. On initialization it's not valid.  I am thinking of returning a specific value (indicating invalid property) to make getall work. I have thought of 3 possible things. I just wanted to know if any one of this can be appropriate "standard wise"?

1) Changing the type of the property to a container type like array of object-path (ao). I think from observation this can be NULL. 

2) Using an invalid object path like "/"

3) Return an object initialized with an empty string. I think I tried this and it blew up because there is a valid type check somewhere in dbus library

I would really appreciate your feedback. 

-----Original Message-----
From: dbus-bounces+nirav.j2.shah=intel.com at lists.freedesktop.org [mailto:dbus-bounces+nirav.j2.shah=intel.com at lists.freedesktop.org] On Behalf Of dbus-request at lists.freedesktop.org
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Subject: dbus Digest, Vol 81, Issue 3

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Today's Topics:

   1. DBUS getall method (Shah, Nirav J2)
   2. Re: DBUS getall method (Thiago Macieira)

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Message: 1
Date: Fri, 6 Apr 2012 19:32:31 +0000
From: "Shah, Nirav J2" <nirav.j2.shah at intel.com>
Subject: DBUS getall method
To: "dbus at lists.freedesktop.org" <dbus at lists.freedesktop.org>
Message-ID:
	<5A7EE8205ACF264A834A5C987038F7B81A178150 at FMSMSX103.amr.corp.intel.com>

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Hello,

I have a dbus implementation which is implementing multiple Interfaces inside a single object beside the standard dbus interfaces.  I have 2 questions.

1) The get_all() function takes the interface_name as an input. But this input seems to be optional (at-least according to the qdbusviewer).  According to the specification is it in fact true (for multiple interface usecase).

2) If the input is infact optional and If some of the properties are not always valid. In the situation can the get_all() just skip those properties? I tried this and maybe it's just my implementation but it crashed. Has anyone done something similar? I couldn't find any examples of multiple interface in a single object at all.

PS: By valid I mean it is not always relevant.

Example to clarify the doubt.
//standard Interface each needs to implement
Object 1-> Object1.Dbus.Introspectable
Object 1-> Object1.Dbus.Properties
//implementation specific interfaces.
Object 1 -> Object1.Interface.A
Object 1-> Object1.Interface.B
Object 1 -> Object1.Interface.C

During introspection I am passing a structure with all the properties belonging to all the interfaces.

Each interface has a set of properties which are not always valid for the object. So in the above example for a particular run time scenario properties of Interface.B may not valid.  What is the get all supposed to do then.

Thanks,
Nirav.

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Message: 2
Date: Fri, 06 Apr 2012 19:35:20 -0300
From: Thiago Macieira <thiago at kde.org>
Subject: Re: DBUS getall method
To: dbus at lists.freedesktop.org
Message-ID: <1515604.v0EWz8MDy5 at tjmaciei-mobl2>
Content-Type: text/plain; charset="us-ascii"

On sexta-feira, 6 de abril de 2012 19.32.31, Shah, Nirav J2 wrote:
> Hello,
> 
> I have a dbus implementation which is implementing multiple Interfaces
> inside a single object beside the standard dbus interfaces.  I have 2
> questions.
> 
> 1) The get_all() function takes the interface_name as an input. But this
> input seems to be optional (at-least according to the qdbusviewer). 
> According to the specification is it in fact true (for multiple interface
> usecase).
> 
> 2) If the input is infact optional and If some of the properties are not
> always valid. In the situation can the get_all() just skip those
> properties? I tried this and maybe it's just my implementation but it
> crashed. Has anyone done something similar? I couldn't find any examples of
> multiple interface in a single object at all.

I'd say this situation is not valid. All readable properties are readable all 
the time and produce a value. The interpretation of said value is something 
the interface decides, though.

> Example to clarify the doubt.
> //standard Interface each needs to implement
> Object 1-> Object1.Dbus.Introspectable
> Object 1-> Object1.Dbus.Properties
> //implementation specific interfaces.
> Object 1 -> Object1.Interface.A
> Object 1-> Object1.Interface.B
> Object 1 -> Object1.Interface.C
> 
> During introspection I am passing a structure with all the properties
> belonging to all the interfaces.
> 
> Each interface has a set of properties which are not always valid for the
> object. So in the above example for a particular run time scenario
> properties of Interface.B may not valid.  What is the get all supposed to
> do then.

Return them anyway, since they *are* valid.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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