Using method inside a choice/when

[Peter J Nelson <pe...@ci.stpaul.mn.us>]

I am trying to use a custom predicate inside of a choice in Spring XML, but
I'm finding my predicate is always being treated as "false" - the bean
itself does not seem to be called.

            <choice>
                <when>&lt;!-- TODO: figure out why this never is evaluated
-->
                    <method ref="openCNPredicate" method="matches"/>
                    <to uri="file:/srv/tritech/data/closedcns"/>
                </when>
                <otherwise>
                    <to uri="file:/srv/tritech/data/foqtemp"/>
                </otherwise>
            </choice>

I've added debugging to my openCNPredicate bean, but I never see it turn up
in the log (all other debug messages do).  I only added the
'method="matches"' part after I found it was not being evaluated.

Can you not use "method" inside of "when"?  I see a lot of documentation
using it inside of "<filter>", but not inside the "<when>".

Thanks for the assistance,

 - Pete



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Re: Using method inside a choice/when

[Peter J Nelson <pe...@ci.stpaul.mn.us>]

I found the root cause of my issue.  I previously had been setting a header,
and simply forgot to set it here.  Once the header is added back in, the
predicate works as advertised.  

I obviously need a test for null in my code.



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Re: Using method inside a choice/when

[Peter J Nelson <pe...@ci.stpaul.mn.us>]

public class OpenCNPredicate implements Predicate {

    private static Logger logger =
LoggerFactory.getLogger(OpenCNPredicate.class);

    /**
     * Checks RMS to see if the CN in the STPCaseNo header exists in RMS or
not
     *
     * @param exchange the exchange object subject to the test
     * @return true if the CN exists in RMS, false otherwise
     * @see Predicate#matches(Exchange)
     */
    @Override
    public boolean matches(Exchange exchange) {
        logger.trace("Method matches(Exchange) called.");
        Message inMsg = exchange.getIn();
        String cn = inMsg.getHeader("STPCaseNo", String.class);
        RMSDAO dao = new RMSDAO();
        boolean result = false;
        try {
            result = dao.cnIsInRMS(cn);
            logger.debug(MessageFormat.format("CN {0} {1} in RMS", cn,
(result ? "is" : "is not")));
        } catch(CADException ex) {
            logger.error("Exception thrown trying to match a CN", ex);
        }
        return result;
    }
}




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Re: Using method inside a choice/when

[souciance <so...@gmail.com>]

Can you share your bean code?

Den 8 mars 2017 5:46 em skrev "Peter J Nelson [via Camel]" <
ml-node+s465427n5795092h15@n5.nabble.com>:

> I am trying to use a custom predicate inside of a choice in Spring XML,
> but I'm finding my predicate is always being treated as "false" - the bean
> itself does not seem to be called.
>
>             <choice>
>                 <when><!-- TODO: figure out why this never is evaluated
> -->
>                     <method ref="openCNPredicate" method="matches"/>
>                     <to uri="file:/srv/tritech/data/closedcns"/>
>                 </when>
>                 <otherwise>
>                     <to uri="file:/srv/tritech/data/foqtemp"/>
>                 </otherwise>
>             </choice>
>
> I've added debugging to my openCNPredicate bean, but I never see it turn
> up in the log (all other debug messages do).  I only added the
> 'method="matches"' part after I found it was not being evaluated.
>
> Can you not use "method" inside of "when"?  I see a lot of documentation
> using it inside of "<filter>", but not inside the "<when>".
>
> Thanks for the assistance,
>
>  - Pete
>
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