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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:booz@us.ibm.com
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 <sca-j@lists.oasis-open.org>
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: mike_edwards@uk.ibm.com
"Reza Shafii" <rshafii@bea.com>
04/01/2008 22:19 To
<sca-j@lists.oasis-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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