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Posted to users@camel.apache.org by addict <er...@yahoo.com> on 2012/06/04 07:33:00 UTC
Problem with Java DSL filter
public class Test extends RouteBuilder {
private volatile String tag = null;
@Override
public void configure() throws Exception {
from("http://url/a.csv")
.filter(header("Tag").isNotNull())
.filter(header("Tag").isNotEqualTo(tag))
.process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
String s = String.valueOf(exchange.getIn().getHeader(
"Tag"));
etag = new String(s);
System.out.println(tag);
}
}).to("file://c:/test/");
}
}
However the comparison always pick up the tag value as null. Can anybody
help
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Re: Problem with Java DSL filter
Posted by addict <er...@yahoo.com>.
AHAAA!!! Stupid mistake.
Thanks.
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Re: Problem with Java DSL filter
Posted by Claus Ibsen <cl...@gmail.com>.
On Mon, Jun 4, 2012 at 5:31 PM, addict <er...@yahoo.com> wrote:
> Yes Claus, when the routes execute for the first time tag will be null,
> however any subsequent time tag will be having the string value assigned to
> it (provided header has attribute tag which is having != null value, which
> is the case with us).
>
> However on debugging i could see on each invocation tag was passed as null
> even though SoP is printing the correct value.
>
Java is pass by value, in method call parameters.
So you need to store the String in a Object holder of some sort if you
want to be able to refer to it as it changes.
Do some googling to read more about this.
> --
> View this message in context: http://camel.465427.n5.nabble.com/Problem-with-Java-DSL-filter-tp5713922p5713957.html
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--
Claus Ibsen
-----------------
FuseSource
Email: cibsen@fusesource.com
Web: http://fusesource.com
Twitter: davsclaus, fusenews
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen
Re: Problem with Java DSL filter
Posted by addict <er...@yahoo.com>.
Yes Claus, when the routes execute for the first time tag will be null,
however any subsequent time tag will be having the string value assigned to
it (provided header has attribute tag which is having != null value, which
is the case with us).
However on debugging i could see on each invocation tag was passed as null
even though SoP is printing the correct value.
--
View this message in context: http://camel.465427.n5.nabble.com/Problem-with-Java-DSL-filter-tp5713922p5713957.html
Sent from the Camel - Users mailing list archive at Nabble.com.
Re: Problem with Java DSL filter
Posted by Claus Ibsen <cl...@gmail.com>.
On Mon, Jun 4, 2012 at 7:33 AM, addict <er...@yahoo.com> wrote:
> public class Test extends RouteBuilder {
>
>
> private volatile String tag = null;
> @Override
> public void configure() throws Exception {
> from("http://url/a.csv")
> .filter(header("Tag").isNotNull())
> .filter(header("Tag").isNotEqualTo(tag))
> .process(new Processor() {
> @Override
> public void process(Exchange exchange) throws Exception {
> String s = String.valueOf(exchange.getIn().getHeader(
> "Tag"));
> etag = new String(s);
> System.out.println(tag);
> }
> }).to("file://c:/test/");
> }
>
>
>
> }
>
>
> However the comparison always pick up the tag value as null. Can anybody
> help
>
Do you mean this filter?
> .filter(header("Tag").isNotEqualTo(tag))
Then its because the configure method is most likely executed before
you have assigned a value to the tag value.
> --
> View this message in context: http://camel.465427.n5.nabble.com/Problem-with-Java-DSL-filter-tp5713919.html
> Sent from the Camel - Users mailing list archive at Nabble.com.
--
Claus Ibsen
-----------------
FuseSource
Email: cibsen@fusesource.com
Web: http://fusesource.com
Twitter: davsclaus, fusenews
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen