Pass method argument in Aspect of custom annotation

Question

I\'m trying to use something similar to org.springframework.cache.annotation.Cacheable :

Custom annotation:

@Target(ElementType.METHOD)
             


        

Answer 1

Spring uses internally an ExpressionEvaluator to evaluate the Spring Expression Language in the key parameter (see CacheAspectSupport)

If you want to emulate the same behaviour, have a look at how CacheAspectSupport is doing it. Here is an snippet of the code:

private final ExpressionEvaluator evaluator = new ExpressionEvaluator();

    /**
     * Compute the key for the given caching operation.
     * @return the generated key, or {@code null} if none can be generated
     */
    protected Object generateKey(Object result) {
        if (StringUtils.hasText(this.metadata.operation.getKey())) {
            EvaluationContext evaluationContext = createEvaluationContext(result);
            return evaluator.key(this.metadata.operation.getKey(), this.methodCacheKey, evaluationContext);
        }
        return this.metadata.keyGenerator.generate(this.target, this.metadata.method, this.args);
    }

    private EvaluationContext createEvaluationContext(Object result) {
        return evaluator.createEvaluationContext(
                this.caches, this.metadata.method, this.args, this.target, this.metadata.targetClass, result);
    }

I don't know which IDE you are using, but it must deal with the @Cacheable annotation in a different way than with the others in order to highlight the params.