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https://issues.apache.org/jira/browse/CAMEL-18172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen updated CAMEL-18172:
--------------------------------
Summary: camel-core - Eagerly resolve ref language (was: Eagerly resolve
ref language)
> camel-core - Eagerly resolve ref language
> -----------------------------------------
>
> 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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