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Posted to dev@beehive.apache.org by "Kyle Marvin (JIRA)" <be...@incubator.apache.org> on 2005/02/25 22:00:48 UTC

[jira] Created: (BEEHIVE-365) Enable optional declarative contextual services

Enable optional declarative contextual services
-----------------------------------------------

         Key: BEEHIVE-365
         URL: http://issues.apache.org/jira/browse/BEEHIVE-365
     Project: Beehive
        Type: Improvement
  Components: Controls  
    Versions: V1Beta    
    Reporter: Kyle Marvin
    Priority: Minor
     Fix For: V1Beta


It would be nice to be able to declaratively specify a contextual service whose presence is optional. Currently, if a service isn't available a ControlException will be thrown during impl initialization.

Having a 'soft failure' mode where no exception is thrown but the service ref is left null would allow:

- user code to generate a more specific and useful error message in an onCreate handler if a needed service is unavailable.

- allow user (or test) code to be written that behaves conditionally based upon whether certain contextual services are/are not available

The default value of 'required' would be true, meaning that if the attribute was not present on an @Context declaration, the behavior would be identical to what it is today (bean instantiation will fail).

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[jira] Updated: (BEEHIVE-365) Enable optional declarative contextual services

Posted by "Kenneth Tam (JIRA)" <be...@incubator.apache.org>.
     [ http://issues.apache.org/jira/browse/BEEHIVE-365?page=history ]

Kenneth Tam updated BEEHIVE-365:
--------------------------------

      Assign To: Kyle Marvin
    Fix Version: V1
                     (was: V1Beta)

> Enable optional declarative contextual services
> -----------------------------------------------
>
>          Key: BEEHIVE-365
>          URL: http://issues.apache.org/jira/browse/BEEHIVE-365
>      Project: Beehive
>         Type: Improvement
>   Components: Controls
>     Versions: V1Beta
>     Reporter: Kyle Marvin
>     Assignee: Kyle Marvin
>     Priority: Minor
>      Fix For: V1

>
> It would be nice to be able to declaratively specify a contextual service whose presence is optional. Currently, if a service isn't available a ControlException will be thrown during impl initialization.
> Having a 'soft failure' mode where no exception is thrown but the service ref is left null would allow:
> - user code to generate a more specific and useful error message in an onCreate handler if a needed service is unavailable.
> - allow user (or test) code to be written that behaves conditionally based upon whether certain contextual services are/are not available
> The default value of 'required' would be true, meaning that if the attribute was not present on an @Context declaration, the behavior would be identical to what it is today (bean instantiation will fail).

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[jira] Updated: (BEEHIVE-365) Enable optional declarative contextual services

Posted by "Kyle Marvin (JIRA)" <be...@incubator.apache.org>.
     [ http://issues.apache.org/jira/browse/BEEHIVE-365?page=all ]

Kyle Marvin updated BEEHIVE-365:
--------------------------------

    Fix Version: TBD
                     (was: V1)

Pushing this minor feature out to a future release, there is a simple workaround, which is use to use BeanContextServices API on ControlBeanContext to query the existence of a service, as follows:

@Context ControlBeanContext context;

...

     TheService service = context.getService(TheService.class,
                                             null);
     if (service == null)
     {
           // service unavailable in execution context
     }
     else
     {
           // service available in execution context
     }


> Enable optional declarative contextual services
> -----------------------------------------------
>
>          Key: BEEHIVE-365
>          URL: http://issues.apache.org/jira/browse/BEEHIVE-365
>      Project: Beehive
>         Type: Improvement
>   Components: Controls
>     Versions: V1Beta
>     Reporter: Kyle Marvin
>     Assignee: Kyle Marvin
>     Priority: Minor
>      Fix For: TBD

>
> It would be nice to be able to declaratively specify a contextual service whose presence is optional. Currently, if a service isn't available a ControlException will be thrown during impl initialization.
> Having a 'soft failure' mode where no exception is thrown but the service ref is left null would allow:
> - user code to generate a more specific and useful error message in an onCreate handler if a needed service is unavailable.
> - allow user (or test) code to be written that behaves conditionally based upon whether certain contextual services are/are not available
> The default value of 'required' would be true, meaning that if the attribute was not present on an @Context declaration, the behavior would be identical to what it is today (bean instantiation will fail).

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