Load Camel's body dynamically depending on header - apache-camel

Question

Hi I want to set to my body an SQL statement in order to be used by the jdbc component afterwards. I have my sql scripts in the resources, thus i can take advantage of simple language to load sth from resources with the usage of resource:classpath. The problem is that url is not static and I want to load different files depending on a header that I've got (``).
<!-- INSERT data -->
<setBody>
<simple>resource:classpath:sql/${header.CamelCustomer}/Insert.sql</simple>
</setBody>
Assuming that I have 2 customers A, and B. That mean that I also have 2 directories
resources/sql/A/Insert.sql
resources/sql/b/Insert.sql
How it is possible to load the different files with the usage of the header?
Thanks in advance!

Answer 1

You can use Content Enricher integration pattern and wrap your simple expression with Language component to get it evaluated.
This should return expected results:
Java DSL:
.enrich().simple("language:simple:resource:classpath:sql/${header.CamelCustomer}/Insert.sql")
XML DSL:
<enrich><simple>language:simple:resource:classpath:sql/${header.CamelCustomer}/Insert.sql</simple></enrich>
I have created sample unit test for demonstration.
src/test/resources/sql/A/Insert.sql
INSERT something INTO A;
src/test/resources/sql/B/Insert.sql
INSERT something INTO B;
DynamicLoadResourceTest
public class DynamicLoadResourceTest extends CamelTestSupport {
#Override
protected RouteBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
#Override
public void configure() throws Exception {
from("direct:start")
.enrich().simple("language:simple:resource:classpath:sql/${header.CamelCustomer}/Insert.sql")
.to("mock:done");
}
};
}
#Test
public void testContentEnrichResource() throws Exception {
MockEndpoint done = getMockEndpoint("mock:done");
Map<String, Object> headers = new HashMap<>();
headers.put("CamelCustomer", "A");
sendBody("direct:start", null, headers);
headers.put("CamelCustomer", "B");
sendBody("direct:start", null, headers);
done.setExpectedCount(2);
done.assertIsSatisfied();
Assert.assertEquals(
"INSERT something INTO A;",
done.getExchanges().get(0).getIn().getBody()
);
Assert.assertEquals(
"INSERT something INTO B;",
done.getExchanges().get(1).getIn().getBody()
);
}
}