Re: Setting properties in included components

[Simon Nash]

Millies, Sebastian wrote:

Hello there,

I have a COMPOSITE scoped component that I would like to configure using some properties. The catch is, I

cannot set these properties immediately, because sensible values depend on where this component is included

via “implementation. composite”. I’d just like to promote the properties and set them later.

You can do this, but not by using promotion.  Promotion is for services
and references, not properties.

That does not seem possible with Tuscany 1.6, it seems I have to fix the values in the original component and

cannot override them in the included component.

Is there a way to achieve what I want?

Yes, there is.  You need to define a composite property and reference
it in the component property by using the source attribute of the
component property element.  Your example would look like this:

<sca:composite name="logger" targetNamespace="http://sca/logger/"/>
   <sca:component name="Logger">
      <!-- component included in many other composites -->
      <sca:property name="capacity" source="$capacity"/>
      <sca:property name="maxPoolSize" source="$maxPoolSize"/>
      <sca:property name="shutdownTimeout" source="$shutdownTimeout"/>
   </sca:component>
   <sca:property name="capacity" type="xs:int"/>
   <sca:property name="maxPoolSize" type="xs:int"/>
   <sca:property name="shutdownTimeout" type="xs:int"/>
</sca:composite>

<sca:composite xmlns:logger="http://sca/logger/"; 
targetNamespace="http://sca/something/"/>
   <sca:component name="IncludedLogger"/>
      <sca:implementation.composite name="logger:logger"/>
      <!-- property values suitable for this inclusion site -->
      <sca:property name="capacity">20000</sca:property>
      <sca:property name="maxPoolSize">2</sca:property>
      <sca:property name="shutdownTimeout">30</sca:property>
   </sca:component>
</sca:composite>

You could also specify default values for the properties in the
composite property elements.  These values would be used if you
don't override them in the IncludedLogger component.

  Simon

--  Sebastian

Here is an example of what I’d like (and doesn’t work):

<sca:composite name=/"logger"/ targetNamespace=/"http://sca/logger/"/>

  <sca:component name=/"Logger"/>

      <!-- component included in many other composites -->

      <sca:property name=/"capacity"//>

      <sca:property name=/"maxPoolSize"//>

      <sca:property name=/"shutdownTimeout"//>

  </sca:component>

  <sca:property name=/"capacity"/ promote=/" Logger/capacity"//>

  <sca:property name=/"maxPoolSize"/ promote=/" Logger/maxPoolSize"//>

<sca:property name=/"shutdownTimeout"/ promote=/" Logger/shutdownTimeout"//>

</sca:composite>

<sca:composite xmlns:logger=/"http://sca/log"/ targetNamespace=/"http://sca/something/"/>

  <sca:component name=/"IncludedLogger"/>

    <sca:implementation.composite name=/"logger:logger"//>

     <!-- property values suitable for this inclusion site -->

      <sca:property name=/"capacity"/>20000</sca:property>

      <sca:property name=/"maxPoolSize"/>2</sca:property>

      <sca:property name=/"shutdownTimeout"/>30</sca:property>

  </sca:component>

</sca:composite>

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