[jira] [Updated] (CAMEL-18172) camel-core - Eagerly resolve ref language when static to optimize

["Claus Ibsen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAMEL-18172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claus Ibsen updated CAMEL-18172:
--------------------------------
    Summary: camel-core - Eagerly resolve ref language when static to optimize  (was: camel-core - Eagerly resolve ref language)

> camel-core - Eagerly resolve ref language when static to optimize
> -----------------------------------------------------------------
>
>                 Key: CAMEL-18172
>                 URL: https://issues.apache.org/jira/browse/CAMEL-18172
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core
>            Reporter: Luca Burgazzoli
>            Assignee: Claus Ibsen
>            Priority: Minor
>             Fix For: 3.18.0
>
>
> The default RefLanguage component lazily resolve the ref expression hence it does not work with kamelets as the route template engine leverages a ThreadLocal bean repository to reify the route template, then such repo si cleared out and not more known by the routing engine.
> A way to workaround it is to create a custom ref language, as example:
> {code:java}
> import org.apache.camel.Expression;
> import org.apache.camel.Predicate;
> import org.apache.camel.language.ref.RefLanguage;
> import org.apache.camel.support.PredicateToExpressionAdapter;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> public class EagerRefLanguage extends RefLanguage {
>     private static final Logger LOGGER = LoggerFactory.getLogger(EagerRefLanguage.class);
>     @Override
>     public Expression createExpression(final String expression) {
>         Expression exp = getCamelContext().getRegistry().lookupByNameAndType(expression, Expression.class);
>         if (exp != null) {
>             LOGGER.debug("Found and instance of {} expression in the registry {}", expression, exp);
>             exp.init(getCamelContext());
>             return exp;
>         }
>         Predicate pred = getCamelContext().getRegistry().lookupByNameAndType(expression, Predicate.class);
>         if (pred != null) {
>             LOGGER.debug("Found and instance of {} predicate in the registry {}", expression, pred);
>             pred.init(getCamelContext());
>             return PredicateToExpressionAdapter.toExpression(pred);
>         }
>         return super.createExpression(expression);
>     }
> }
> {code}
> And bind it to the registry so camel will use as beans from the registry ahve priority over discovery form service loader.
> This is clearly an hack but we may want to bring such optimization to camel core, so i.e. if a ref expression is not dynamic, then we can load it when the ref is reified.



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