[jira] [Commented] (CAMEL-10352) Optionally delegate to Aries PropertyEvaluator services in BlueprintPropertiesParser

[Grzegorz Grzybek (JIRA)]

    [ 
https://issues.apache.org/jira/browse/CAMEL-10352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529157#comment-15529157
 ] 

Grzegorz Grzybek commented on CAMEL-10352:
------------------------------------------

Currently, in Blueprint Camel contexts we can do 
({{useBlueprintPropertyResolver="true"}} is default):
{code:xml}
<cm:property-placeholder persistent-id="my-placeholders" 
useBlueprintPropertyResolver="true">
  <cm:default-properties>
    <cm:property name="greeting" value="Hello"/>
    <cm:property name="destination" value="mock:result"/>
  </cm:default-properties>
</cm:property-placeholder>
<camelContext xmlns="http://camel.apache.org/schema/blueprint";>
  <route>
    <from uri="direct:start"/>
    <transform>
      <simple>{{greeting}} ${body}</simple>
    </transform>
    <to uri="{{destination}}"/>
  </route>
</camelContext>
{code}

useBlueprintPropertyResolver="true" makes PropertiesComponent aware of Aries 
{{org.apache.aries.blueprint.ext.AbstractPropertyPlaceholder}} instances, like 
{{<cm:property-placeholder>}} or {{<ext:property-placeholder>}}.

There's however another feature of Blueprint property placeholder resolvers: 
{{org.apache.aries.blueprint.ext.evaluator.PropertyEvaluator}}.
This evaluator is used ONLY when postprocessing blueprint CDR (component 
definition registry) - similar to Spring's BeanFactoryPostprocessors.

So if we have something like this in Blueprint XML:
{code:xml}
  <bean id="myBean" class="my.Bean">
    <argument value="${x.y.z}"/>
</bean>
{code}

evaluator will be used, because {{$&#123;x.y.z&#125;}} is resolved at 
_component registry postprocessing time_. But it won't be used here:
{code:xml}
  <camelContext xmlns="http://camel.apache.org/schema/blueprint";>
    <route>
      <from uri="direct:start"/>
      <transform>
        <simple>{{x.y.z}}</simple>
      </transform>
      <to uri="{{destination}}"/>
    </route>
  </camelContext>
{code}

because even if Camel's PropertiesComponent will delegate to Blueprint (from 
{{org.apache.camel.blueprint.BlueprintPropertiesParser#parseProperty()}} call 
to e.g., {{org.apache.aries.blueprint.ext.PropertyPlaceholder#getProperty()}}), 
Blueprint won't use PropertyEvaluator any more.

h2. Possible solution

> Optionally delegate to Aries PropertyEvaluator services in 
> BlueprintPropertiesParser
> ------------------------------------------------------------------------------------
>
>                 Key: CAMEL-10352
>                 URL: https://issues.apache.org/jira/browse/CAMEL-10352
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-blueprint, osgi
>            Reporter: Grzegorz Grzybek
>            Assignee: Luca Burgazzoli
>




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