This document provides an overview of using Apache Camel for integration patterns within a Probability of Default Microservice. It discusses enterprise integration patterns that Camel supports, how to define routes between endpoints, processing exchanges between endpoints using processors, comparing Camel to Spring Integration, an example PDM Camel architecture, interfacing Camel with other services like SAM, and techniques for testing Camel routes.

1. UseTest1
Probability of Default Microservice
RHD BrainBit, 01-03-2018
Bert Koorengevel –The Commitments
Und jetzt kommen die Kamele …

2. Agenda
• PDM – Enterprise Integration Patterns
• Wat is Apache Camel?
• Waarom gebruiken we Camel?
• Zijn er alternatieven?
• Hoe ziet een Camel project er uit?

3. PDM
Facility
Advanced
Data
Analytics
Special
Assessment
Management
Credit
Assessment
Suite
RRR
PDM – Probability of Default Microservice
Enriched
Facility
RRR

4. Patterns
• Design Patterns
• 23 stuks
• Enterprise Integration Patterns
• 65 stuks

5. Messaging Patterns

6. Und jetzt kommen die Kamele …
Apache Camel is:
• Open source lightweight Integration framework
• Library: .jar dependencies
camel-core.jar + .jar per component
• Gebaseerd op Enterprise Integration patterns
• Java,Groovy & Scala fluent DSL
• Versie 1.0 gepubliceerd in 2007, huidige versie: 2.20.3
• Integreert met Spring (-boot)
ApplicationContext  CamelContext
6

7. How do I get started with Apache Camel?
Apache Camel is easy,
just read this 912 page book ;)
Workshop van Ivo Woltring:
• https://github.com/Ordina-JTech/camel-workshop
Of deep-dive:
• http://camel.apache.org

8. Endpoint URI’s - Components
• http[s]://hostName[:port][/resourceUri][?options]
• bean:beanName[?options]
• consul:apiEndpoint[?options]
• direct:someName[?options]
• ejb:ejbName[?options]
• file://nameOfFileOrDirectory[?options]
• hipchat://[host][:port]?options
• jdbc:dataSourceName[?options]
• rest:verb:path[?options]
• validation:resourceName[?options]

9. Routes definieren tussen Endpoints
9
@Component
public class HelloRouteBuilder extends RouteBuilder {
@Override
public void configure() {
from("rest:get:hello:/{me}")
.transform().simple("Hi ${header.me}");
from("rest:post:hello")
.setHeader("subject", constant("Hello!"))
.to("smtp:admin@tempuri.com");
}
}

10. Exchange & Processor
• Exchange
• In(putMessage)
• Header
• Body
• Out(putMessage)
• Header
• Body
• Exception
• [tl;dr]
@Component
public class GetOrderProcessor implements Processor {
@Autowired CustomerOrderRepository repo;
public void process(Exchange exchg) {
Customer cust = exchg.getIn()
.getBody(Customer.class);
exchg.getOut()
.setBody(repo.findAll(cust.getId()));
}
}
@Autowired GetOrderProcessor getOrders
. . .
from("direct:getcustomerorders").process(getOrders);

11. VergelijkingCamel met Spring Integration

12. PDM – Camel kernel
from("direct:determine_pd")
.to("bean-validator:facility")
.log("Start PDM for facility id: ${body.facilityId}")
.to(MULTI_URI)
.log("--> CAS")
.to(CalculatePDClientAdapter.URI)
.log(" RRR = ${body.rabobankRiskRating}");
from(MULTI_URI)
.multicast(multiStrategy)
.stopOnException()
.parallelProcessing()
.to( AdaGetBehaviouralDataRoute.URI,
SamGetDpdInfoAdapter.URI,
SamGetFacilityDefaultStatusAdapter.URI)
.end();

13. PDM – SAM interconnection
@Value("${service.sam.getdpdinfourl}")
private String getDpdInfoUrl;
. . .
from(SamGetDpdInfoAdapter.URI)
.to(SamGetDpdInfoClient.URI)
.unmarshall().json(JsonLibrary.Jackson, DPDInfo.class);
from(SamGetDpdInfoClient.URI)
.setHeader(Exchange.HTTP_METHOD, constant(HttpMethods.GET))
.setHeader(Exchange.HTTP_URI, simple(getDpdInfoUrl))
.to("https4:get");

14. Testing Camel routes
14
@RunWith(CamelSpringRunner.class)
public class SamGetDpdInfoAdapterTest {
@Produce(uri=TEST_START) ProducerTemplate samDpdInfoProducer;
@EndpointInject(uri=MOCK_RESULT) MockEndpoint resultEndpoint;
@TestConfiguration
public static class TestConfig extends SingleRouteCamelConfiguration {
@Override public RouteBuilder route() {
return () -> {
from(TEST_START).to(SamGetDpdInfoAdapter.URI).to(MOCK_RESULT);
}
}
}
@Test
public void test() {
resultEndpoint.expectedMessageCount(1);
resultEndpoint.allMessages().body(DPDInfo.class).isNotNull();
Facility facility = new Facility(“123”);
samDpdInfoProducer.sendBody(facility);
resultEndpoint.assertIsSatisfied();
}
}

15. Vragen ?
Bedankt voor jullie aandacht!