Apache Camel processing with a substring of the message - apache-camel

Question

I want to build a Camel route that do 3 HttpRequests but in every request it should only a part of the body.
In my Message Body is this XML:
<part1>
...
</part1>
<part2>
...
</part2>
<part3>
...
</part3>
Now every Part should send to a REST-Service. The Rest-Service response with some data, this data I must put in the body of the next part. How can I solve this?
The route should like this:
from("activemq:inMsg")
.setBody(xpath("//part1")).inOut("http4://localhost/workingPart1")
.choice()
.when()
.replay().isEqual("ok")
.setBody("<responsePart1>"+replay()+"</responsePart1>" + xpath("//part2")).inOut("http4://localhost/workingPart2")
.choice()
.when()
.replay().isEqual("ok")
.setBody("<responsePart2>"+replay()+"</responsePart2>" + xpath("//part3")).inOut("http4://localhost/workingPart3")
.otherwiese().to("activemq:error")
.end()
.otherwiese().to("activemq:error")
.end()
Can you help me to find the right syntax?
Thank you

Answer 1

I guess there is more than one possible solution for that:
ModelCamelContext context = new DefaultCamelContext();
context.addRoutes(new RestBuilder("direct:rest1", "http4://localhost/workingPart1"));
context.addRoutes(new RestBuilder("direct:rest2", "http4://localhost/workingPart2"));
context.addRoutes(new RestBuilder("direct:rest3", "http4://localhost/workingPart3"));
context.addRoutes(new MainRouteBuilder());
ProducerTemplate template = context.createProducerTemplate();
template.sendBody("direct:start", XML);
The RestBuilder class:
public class RestBuilder extends RouteBuilder {
private final String endpoint;
private final String uri;
public RestBuilder(final String endpoint, final String uri) {
this.endpoint = endpoint;
this.uri = uri;
}
#Override
public void configure() {
from(endpoint)
.setHeader(Exchange.HTTP_METHOD, constant(org.apache.camel.component.http4.HttpMethods.POST))
.to(uri)
.choice()
.when(header(Exchange.HTTP_RESPONSE_CODE).isNotEqualTo(Integer.valueOf(200)))
.throwException(new IllegalStateException());
}
}
The MainRouteBuilder class:
public class MainRouteBuilder extends RouteBuilder {
#Override
public void configure() {
onException(IllegalStateException.class)
.log("Hm, no good")
.to("activemq:error")
.handled(true);
from("direct:start")
.setProperty("part1").xpath("/parts/part1/*")
.setProperty("part2").xpath("/parts/part2/*")
.setProperty("part3").xpath("/parts/part3/*")
.setBody(simple("${property.part1}"))
.to("direct:rest1")
.setBody(simple("<responsePart1>${body}</responsePart1>${property.part2}"))
.to("direct:rest2")
.setBody(simple("<responsePart2>${body}</responsePart2>${property.part3}"))
.to("direct:rest3");
}
}