package camelinaction;
import java.util.concurrent.TimeoutException;
import org.apache.camel.RoutesBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.Test;
/**
* Hystrix using timeout with Java DSL
*/
public class CamelHystrixTimeoutTest extends CamelTestSupport {
@Test
public void testFast() throws Exception {
// this calls the fast route and therefore we get a response
Object out = template.requestBody("direct:start", "fast");
assertEquals("Fast response", out);
}
@Test
public void testSlow() throws Exception {
// this calls the slow route and therefore causes a timeout which triggers an exception
try {
template.requestBody("direct:start", "slow");
fail("Should fail due timeout");
} catch (Exception e) {
// expected a timeout
assertIsInstanceOf(TimeoutException.class, e.getCause().getCause());
}
}
@Override
protected RoutesBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
@Override
public void configure() throws Exception {
from("direct:start")
.hystrix()
// use 2 second timeout
.hystrixConfiguration().executionTimeoutInMilliseconds(2000).end()
.log("Hystrix processing start: ${threadName}")
.toD("direct:${body}")
.log("Hystrix processing end: ${threadName}")
.end()
.log("After Hystrix ${body}");
from("direct:fast")
// this is a fast route and takes 1 second to respond
.log("Fast processing start: ${threadName}")
.delay(1000)
.transform().constant("Fast response")
.log("Fast processing end: ${threadName}");
from("direct:slow")
// this is a slow route and takes 3 second to respond
.log("Slow processing start: ${threadName}")
.delay(3000)
.transform().constant("Slow response")
.log("Slow processing end: ${threadName}");
}
};
}
}