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Posted to users@felix.apache.org by njm09 <nj...@mails.tsinghua.edu.cn> on 2010/08/28 18:54:44 UTC
For Help
Hi
I am a beginner about osgi and felix. I found that ipojo is a good thing which can facilitate the development of OSGI-SOA based framework.
But i am confronted with a problem. How I can obtain several ipojo instances in the same bundle?
I have had a try about the strategy="SERVICE" and service="instance", but the result is passive.
Thank you for your help!
Best Regards
Ni.
2010-08-29
njm09
Re: For Help
Posted by "Richard S. Hall" <he...@ungoverned.org>.
On 8/30/10 10:52, njmtql wrote:
> Thank you for your repley.
>
> I am sorry that i haven't clearly described my problem.
>
> I think what i am confronted with is the first case you have mentioned. That
> is i have a component (which provides a service) is one bundle with ipojo
> and want obtain servral service objects (the number is unknow) of the
> componnet. How can I do it ?
>
> It is like the concept of "Factory", but it is not. Just add "strategy =
> "SERVICE"" to the component's description, we can obtain a service factory.
> But we can only obtain the same instance in the same bundle (different
> instances between different bundles).
>
> From the document, i learned that the "strategy = "Instance"" looks like my
> need. But i do not know how to obtain serveral service objects in the other
> bundle.
The strategy just indicates what each request for a component will
produce, e.g., "service" will be one instance per bundle, whereas
"instance" will be one per requesting component. These do not impact how
many components are created.
Creating instances of components must still be done explicitly, since
iPOJO has no way of knowing how many instances you actually want. You
can either create configured instances in your XML file or you can
define another component that uses your desired component's factory
service to programmatically create as many instances as you need.
iPOJO will not just create an arbitrary number of component instances.
The strategies of one global service, one per bundle, or one per
component instances are just common policies. When you need something
different, you have to use factories directly or you could look into
creating your own creation strategy.
-> richard
>
>
> Richard S. Hall wrote:
>> On 8/28/10 12:54, njm09 wrote:
>>> Hi
>>> I am a beginner about osgi and felix. I found that ipojo is a good
>>> thing which can facilitate the development of OSGI-SOA based framework.
>>>
>>> But i am confronted with a problem. How I can obtain several ipojo
>>> instances in the same bundle?
>> It's not clear to me what you mean here.
>>
>> Do you have a component defined in a bundle and you want to create
>> multiple instances of it?
>>
>> Or do you have multiple components defined in a bundle from which you
>> want to create an instance of each?
>>
>> If it is either, then both should be possible, you just need to use
>> <instance> in your XML file for each instance you want to create.
>>
>> -> richard
>>
>>> I have had a try about the strategy="SERVICE" and
>>> service="instance", but the result is passive.
>>>
>>> Thank you for your help!
>>>
>>> Best Regards
>>> Ni.
>>> 2010-08-29
>>>
>>>
>>>
>>> njm09
>>>
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>> To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
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>>
>>
>>
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Re: For Help
Posted by njmtql <nj...@qq.com>.
Thank you for your repley.
I am sorry that i haven't clearly described my problem.
I think what i am confronted with is the first case you have mentioned. That
is i have a component (which provides a service) is one bundle with ipojo
and want obtain servral service objects (the number is unknow) of the
componnet. How can I do it ?
It is like the concept of "Factory", but it is not. Just add "strategy =
"SERVICE"" to the component's description, we can obtain a service factory.
But we can only obtain the same instance in the same bundle (different
instances between different bundles).
>From the document, i learned that the "strategy = "Instance"" looks like my
need. But i do not know how to obtain serveral service objects in the other
bundle.
Richard S. Hall wrote:
>
> On 8/28/10 12:54, njm09 wrote:
>> Hi
>> I am a beginner about osgi and felix. I found that ipojo is a good
>> thing which can facilitate the development of OSGI-SOA based framework.
>>
>> But i am confronted with a problem. How I can obtain several ipojo
>> instances in the same bundle?
>
> It's not clear to me what you mean here.
>
> Do you have a component defined in a bundle and you want to create
> multiple instances of it?
>
> Or do you have multiple components defined in a bundle from which you
> want to create an instance of each?
>
> If it is either, then both should be possible, you just need to use
> <instance> in your XML file for each instance you want to create.
>
> -> richard
>
>>
>> I have had a try about the strategy="SERVICE" and
>> service="instance", but the result is passive.
>>
>> Thank you for your help!
>>
>> Best Regards
>> Ni.
>> 2010-08-29
>>
>>
>>
>> njm09
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@felix.apache.org
> For additional commands, e-mail: users-help@felix.apache.org
>
>
>
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Re: For Help
Posted by "Richard S. Hall" <he...@ungoverned.org>.
On 8/28/10 12:54, njm09 wrote:
> Hi
> I am a beginner about osgi and felix. I found that ipojo is a good thing which can facilitate the development of OSGI-SOA based framework.
>
> But i am confronted with a problem. How I can obtain several ipojo instances in the same bundle?
It's not clear to me what you mean here.
Do you have a component defined in a bundle and you want to create
multiple instances of it?
Or do you have multiple components defined in a bundle from which you
want to create an instance of each?
If it is either, then both should be possible, you just need to use
<instance> in your XML file for each instance you want to create.
-> richard
>
> I have had a try about the strategy="SERVICE" and service="instance", but the result is passive.
>
> Thank you for your help!
>
> Best Regards
> Ni.
> 2010-08-29
>
>
>
> njm09
>
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