Re: Re: Can I regist two instance providers for a same CIM class?

Oh it could work that way.
Whether or not is might be better I don't know.
But the point is it is currently not the way it is expected to work.
In general vendors tend to always extend the functionality, so must subclassed.
For example, if they are providing a diagnostic of some sort, if it is short, 
they can just just have a property that the provider knows it has to run the 
diagnostic every time the property is accessed.  They then only create a method 
if a parameter has to be passed in.  While other vendors always create methods, 
whether it needs parameters or not.
But there may be many other ways it could work.
To allow a list of providers for a single class would require more cooperation 
between vendors than now exists.

 Kirk Augustin
11821 NW McNamee Rd
Portland, OR 97231




________________________________
From: Edward Shober <[email protected]>
To: Kirk Augustin <[email protected]>; huruifeng <[email protected]>; 
Paul Robert Marino <[email protected]>
Cc: "Sampige, Sahana Prabhakar (R&DBangalore)" <[email protected]>; 
"[email protected]" <[email protected]>
Sent: Tue, April 26, 2011 10:34:01 AM
Subject: RE: Re: Can I regist two instance providers for a same CIM class?

This is all theoretical, but each instance of the class should be 
distinguishable
by a set of keys. So, if you want to set properties of a particular device you
must send the key values as well. Providers must ignore operations on instances
that don't match the key values of the devices that they're responsible for.
The CIMOM would call all providers registered for a particular class and each
would respond with the instances that they have. Of course, if vendors extend
the functionality of classes they must subclass.

I guess my point is that, this may not be the way it works, but I don't see why
it couldn't work this way.

________________________________________
From: Kirk Augustin [[email protected]]
Sent: Tuesday, April 26, 2011 11:07 AM
To: Edward Shober; huruifeng; Paul Robert Marino
Cc: Sampige, Sahana Prabhakar (R&DBangalore); [email protected]
Subject: Re: Re: Can I regist two instance providers for a same CIM class?

Yes, each vendor is supposed to subclass with their company or product name 
appended to the class.
Otherwise if you wanted to configure or set properties of a particular device, 
you would end up sending it to all of the devices of that class, when you really 
meant to only set the one brand device.
Typically each vendor uses different hardware/software features, so requires its 
own provider, and therefore own subclass.
If you don't subclass, then how would the CIMOM know which provider to call?

Kirk Augustin
11821 NW McNamee Rd
Portland, OR 97231


________________________________
From: Edward Shober <[email protected]>
To: huruifeng <[email protected]>; Paul Robert Marino <[email protected]>; 
Kirk Augustin <[email protected]>
Cc: "Sampige, Sahana Prabhakar (R&DBangalore)" <[email protected]>; 
"[email protected]" <[email protected]>
Sent: Tue, April 26, 2011 8:38:55 AM
Subject: RE: Re: Can I regist two instance providers for a same CIM class?

I'm not sure what Huruifeng is trying to do but it seems like it should
be important for multiple providers to be able to be registered for the
same class. What about multiple PCI devices from different vendors
for example? Shouldn't each vendor be able to register their provider
with the CIMOM so that they can each serve up the appropriate
instances of PCIDevice for their specific devices?

I don't see why the CIMOM can't have a list of providers to be queried
for each class. Does each vendor have to subclass PCIDevice or can
they each register as an instance provider for PCIDevice?

________________________________
From: huruifeng [[email protected]<mailto:[email protected]>]
Sent: Tuesday, April 26, 2011 12:41 AM
To: Paul Robert Marino; Kirk Augustin
Cc: Sampige, Sahana Prabhakar (R&DBangalore); 
[email protected]<mailto:[email protected]>
Subject: Re: Re: Can I regist two instance providers for a same CIM class?

Hi Paul:
Thank you for your idea.It is a way to resolve my problem,but when I have a lot 
of third-party providers,writting proxy providers will be a big job.

Regards
2011-04-26
________________________________
huruifeng
________________________________
发件人： Paul Robert Marino
发送时间： 2011-04-26  14:15:17
收件人： Kirk Augustin
抄送： huruifeng; Sampige, Sahana Prabhakar (R&DBangalore); 
[email protected]<mailto:[email protected]>
主题： Re: Can I regist two instance providers for a same CIM class?
The simple answer is if you want two different c or java based providers to 
provide information to one or multiple instances of the same class create a 
proxy provider which gathers information from both and consolidates it into 
specific instances prior to handing the information off to open Pegasus or any 
other WBEM server API.


On 4/25/2011 11:40 PM, Kirk Augustin wrote:
Hi Huruifeng,

It does not matter what kind of provider you might want to try having 2 of, it 
won't work.
If it could, it would be ambiguous.
When you register the 2nd provider, for the same purpose, it will over write the 
first.
I am not familiar with Small Footprint CIM Broker (SFCB), but it would make no 
sense for it allow 2 providers for the same class and purpose.
I have not actually tried to have a separate provider for say instances and 
methods, because there would be no reason to.
A method provider would also need to know about instances as well, so it is hard 
to see how it would be useful to separate them.
Nothing is gained by having more providers than the minimal necessary.
Often it is easiest to use one provider for many, many classes.
The provider is told what class it is being queried on, so there is no problem 
having fewer providers.
Think of each provider as an interface to a database.
You would not want a provider for each table in a database, but just one for the 
entire database.
You don't need another provider until you have a different database to also be 
able to connect to.

Kirk Augustin
11821 NW McNamee Rd
Portland, OR 97231


________________________________
From: huruifeng 
<[email protected]<mailto:[email protected]>><mailto:[email protected]<mailto:[email protected]>>

To: "Sampige, Sahana Prabhakar (R&D Bangalore)" 
<[email protected]<mailto:[email protected]>><mailto:[email protected]<mailto:[email protected]>>;
"[email protected]<mailto:[email protected]>"<mailto:[email protected]<mailto:[email protected]>>
> 
<[email protected]<mailto:[email protected]>><mailto:[email protected]<mailto:[email protected]>>

Sent: Mon, April 25, 2011 8:03:27 PM
Subject: Re: RE: Can I regist two instance providers for a same CIM class?

Hi Sahana:
Here "two providers" you mean two instance providers?
Now I hava two indication providers for CIM_AlertIndication,can I regist both of 
them like sfcb does?
And what about a instance provider and a method provider both for 
CIM_ComputerSystem?

Regards

2011-04-26
________________________________
huruifeng
________________________________
发件人： Sampige, Sahana Prabhakar (R&D Bangalore)
发送时间： 2011-04-25  17:53:17
收件人： huruifeng; 
[email protected]<mailto:[email protected]><mailto:[email protected]<mailto:[email protected]>>

抄送：
主题： RE: Can I regist two instance providers for a same CIM class?
Hi Huruifeng,
You cannot register two providers for the same CIM class. But you could register 
one provider each for the CIM class hierarchy. When you enumerate the base class 
for example CIM_ManagedElement, instances for CIM_ManagedElement and its sub 
class like CIM_LogicalElement, CIM_Processor etc, will be returned.
Rgds,
Sahana

From: huruifeng [mailto:[email protected]<mailto:[email protected]>]
Sent: Monday, April 25, 2011 3:05 PM
To: 
[email protected]<mailto:[email protected]><mailto:[email protected]<mailto:[email protected]>>

Subject: Can I regist two instance providers for a same CIM class?

Hi:
Can I regist two instance providers for a same CIM class?
If it is possible, which provider will be called when a getInstance request is 
recieved?

Regards

2011-04-25
________________________________
huruifeng


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