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Chapter 3. Defining Camel routes

In Red Hat build of Apache Camel for Quarkus, you can define Camel routes using the following languages:

3.1. Java DSL
링크 복사

Extending org.apache.camel.builder.RouteBuilder and using the fluent builder methods available there is the most common way of defining Camel Routes. Here is a simple example of a route using the timer component: 

import org.apache.camel.builder.RouteBuilder;

public class TimerRoute extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        from("timer:foo?period=1000")
                .log("Hello World");
    }
}

3.2. Endpoint DSL
링크 복사

Since Camel 3.0, you can use fluent builders also for defining Camel endpoints. The following is equivalent with the previous example: 

import org.apache.camel.builder.RouteBuilder;
import static org.apache.camel.builder.endpoint.StaticEndpointBuilders.timer;

public class TimerRoute extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        from(timer("foo").period(1000))
                .log("Hello World");
    }
}
Note

Builder methods for all Camel components are available via camel-quarkus-core, but you still need to add the given component’s extension as a dependency for the route to work properly. In case of the above example, it would be camel-quarkus-timer.

3.3. XML IO DSL
링크 복사

In order to configure Camel routes, rests or templates in XML, you must add a Camel XML parser dependency to the classpath. Since Camel Quarkus 1.8.0, link:https://access.redhat.com/documentation/en-us/red_hat_build_of_apache_camel/4.0/html-single/red_hat_build_of_apache_camel_for_quarkus_reference/ #extensions-xml-io-dsl[camel-quarkus-xml-io-dsl] is the best choice.

With Camel Main, you can set a property that points to the location of resources XML files such as routes, REST DSL and Route templates: 

camel.main.routes-include-pattern = routes/routes.xml, file:src/main/routes/rests.xml, file:src/main/rests/route-template.xml
Note

Path globbing like camel.main.routes-include-pattern = *./routes.xml currently does not work in native mode.

Route

<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://camel.apache.org/schema/spring"
        xsi:schemaLocation="
            http://camel.apache.org/schema/spring
            http://camel.apache.org/schema/spring/camel-spring.xsd">

    <route id="xml-route">
        <from uri="timer:from-xml?period=1000"/>
        <log message="Hello XML!"/>
    </route>

</routes>

Warning

When using XML routes with beans, it is sometime needed to refer to class name, for instance beanType=org.apache.SomeClass. In such cases, it might be needed to register the class for reflection in native mode. Refer to the Native mode section for more information.

Warning

Spring XML with <beans> or Blueprint XML with <blueprint> elements are not supported.

The route XML should be in the simplified version like:

Rest DSL

<rests xmlns="http://camel.apache.org/schema/spring">
    <rest id="greeting" path="/greeting">
        <get path="/hello">
            <to uri="direct:greet"/>
        </get>
    </rest>
</rests>

Route Templates

<routeTemplates xmlns="http://camel.apache.org/schema/spring">
    <routeTemplate id="myTemplate">
        <templateParameter name="name"/>
        <templateParameter name="greeting"/>
        <templateParameter name="myPeriod" defaultValue="3s"/>
        <route>
            <from uri="timer:{{name}}?period={{myPeriod}}"/>
            <setBody><simple>{{greeting}} ${body}</simple></setBody>
            <log message="${body}"/>
        </route>
    </routeTemplate>
</routeTemplates>

3.4. YAML DSL
링크 복사

To configure routes with YAML, you must add the camel-quarkus-yaml-dsl dependency to the classpath.

With Camel Main, you can set a property that points to the location of YAML files containing routes, REST DSL and Route templates definitions: 

camel.main.routes-include-pattern = routes/routes.yaml, routes/rests.yaml, rests/route-template.yaml

Route

- route:
    id: "my-yaml-route"
    from:
      uri: "timer:from-yaml?period=1000"
      steps:
        - set-body:
            constant: "Hello YAML!"
        - to: "log:from-yaml"

Rest DSL

- rest:
    get:
      - path: "/greeting"
        to: "direct:greet"

- route:
    id: "rest-route"
    from:
      uri: "direct:greet"
      steps:
        - set-body:
            constant: "Hello YAML!"

Route Templates

- route-template:
    id: "myTemplate"
    parameters:
      - name: "name"
      - name: "greeting"
        defaultValue: "Hello"
      - name: "myPeriod"
        defaultValue: "3s"
    from:
      uri: "timer:{{name}}?period={{myPeriod}}"
      steps:
      - set-body:
          expression:
            simple: "{{greeting}} ${body}"
      - log: "${body}"

- templated-route:
    route-template-ref: "myTemplate"
    parameters:
      - name: "name"
        value: "tick"
      - name: "greeting"
        value: "Bonjour"
      - name: "myPeriod"
        value: "5s"

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