Luca Burgazzoli created CAMEL-18172:
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Summary: 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
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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