Dave,
I suppose we could use ServiceUnavailableException.
I'm not sure that the distinction is
particularly useful. The client can't do anything really
different other than log the error using
a different name.
Yours, Mike.
Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014 Mobile: +44-7802-467431
Email:
David Booz <>
07/01/2008 15:34
To
cc
Subject
Re: [sca-j] ISSUE 4 - Dependency reinjection
Mike,
Why wouldn't we use the existing ServiceUnavailableException for your
additional case?
Dave Booz
STSM, SCA and WebSphere Architecture
Co-Chair OASIS SCA-Policy TC
"Distributed objects first, then world hunger"
Poughkeepsie, NY (845)-435-6093 or 8-295-6093
e-mail:
http://washome.austin.ibm.com/xwiki/bin/view/SCA2Team/WebHome
Mike Edwards
<mike_edwards@uk.
ibm.com>
To
"OASIS
Java"
01/07/2008 04:27
<>
AM
cc
Subject
Re: [sca-j]
ISSUE 4 - Dependency
reinjection
Reza,
This is a good contribution to settling this item of work.
I suggest one addition to the table - "Target Service Undeployed"
is OK for
services within the SCA Domain - to deal with services elsewhere,
"Target Service becomes Unavailable" is a better description
(we don't know
anything about HOW it became unavailable), but the effects are the same.
|------+-----------------------+-----------------------+-----------------|
| |
| Effect on
| |
|------+-----------------------+-----------------------+-----------------|
| Chang| Reference |
Existing | Subsequent
|
| e |
| ServiceReference | Invocations
of |
| Event|
| Object
| ComponentContext|
| |
|
| .
|
| |
|
| getServiceRefere|
| |
|
| nce() or |
| |
|
| cast()
|
|------+-----------------------+-----------------------+-----------------|
| Chang| MAY be reinjected (if | MUST continue to work | Result
|
| e to | other conditions | as if the reference
| corresponds to |
| the | apply).
| target was not | the injected |
| Targe| If not reinjected, | changed.
| reference (i.e.|
| t of | then it MUST continue |
| changed only if |
| a | to work as if the |
| reinjection
|
| Refer| reference target was |
| occurred). |
| ence | not changed. |
|
|
|------+-----------------------+-----------------------+-----------------|
| Targe| Business methods | Business methods
| Result SHOULD be|
| ted | SHOULD throw | SHOULD throw
| a reference to |
| Servi| InvalidServiceExceptio| InvalidServiceExceptio| the undeployed
|
| ce | n.
| n.
| service. |
| Undep|
|
| Business methods|
| loyed|
|
| SHOULD throw |
| |
|
| InvalidServiceEx|
| Targe|
|
| ception. |
| t |
|
|
|
| Servi|
|
|
|
| ce |
|
|
|
| becom|
|
|
|
| es |
|
|
|
| Unava|
|
|
|
| ilabl|
|
|
|
| e |
|
|
|
|------+-----------------------+-----------------------+-----------------|
| Targe| MAY continue to work, | MAY continue to work, | Result SHOULD
be|
| ted | depending on the | depending on the
| a reference to |
| Servi| runtime and the type | runtime and the type | the
changed |
| ce | of change that was | of change that was
| service. |
| Chang| made. If it doesn't | made. If it doesn't |
|
| ed | work, the exception | work, the exception |
|
| | thrown will depend on | thrown will depend on |
|
| | the runtime and the | the runtime and the
| |
| | cause of the failure. | cause of the failure. |
|
|------+-----------------------+-----------------------+-----------------|
Now, I'd like to propose the following, which I realize changes some of
the
decisions we made previously, but I am getting concerned about complexity:
1. No reinjection of references occurs by default for any component of
any
scope
2. Any component of any scope can declare that it requires reinjection.
My
suggestion is to provide a parameter to the @Reference
annotation reinject="true", which only has meaning for References
which are
a) Fields b) accessible via a setter method (ie it cannot apply to a
reference injected via the constructor).
This I believe is much simpler and it gives the component writer a chance
to decide for themselves whether they want to be concerned about
wiring changes occurring dynamically during the lifetime of a component.
It will also make it simpler for us to give a good description of the
kinds of circumstance in which it might be good to react to wiring changes.
Yours, Mike.
Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014 Mobile: +44-7802-467431
Email:
"Reza Shafii" <>
04/01/2008 22:19
To
<-ope
n.org>
cc
Subject
[sca-j] ISSUE 4 -
Dependency reinjection
Hi All,
In an effort to try to put more structure around a potential solution to
issue 4, Michael and I put together the attached table. Most of the content
is derived from conlusions reached by the TC's past discussions. A matrix
such as this might help us better focus future discussions.
Looking forward to your feedback,
Reza
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