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Chapter 5. Contexts and Dependency Injection (CDI) in Camel Quarkus

CDI plays a central role in Quarkus and Camel Quarkus offers a first class support for it too.

You may use @Inject, @ConfigProperty and similar annotations e.g. to inject beans and configuration values to your Camel RouteBuilder, for example: 

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import org.apache.camel.builder.RouteBuilder;
import org.eclipse.microprofile.config.inject.ConfigProperty;

@ApplicationScoped
1 

public class TimerRoute extends RouteBuilder {

    @ConfigProperty(name = "timer.period", defaultValue = "1000")
2 

    String period;

    @Inject
    Counter counter;

    @Override
    public void configure() throws Exception {
        fromF("timer:foo?period=%s", period)
                .setBody(exchange -> "Incremented the counter: " + counter.increment())
                .to("log:cdi-example?showExchangePattern=false&showBodyType=false");
    }
}
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1
The @ApplicationScoped annotation is required for @Inject and @ConfigProperty to work in a RouteBuilder. Note that the @ApplicationScoped beans are managed by the CDI container and their life cycle is thus a bit more complex than the one of the plain RouteBuilder. In other words, using @ApplicationScoped in RouteBuilder comes with some boot time penalty and you should therefore only annotate your RouteBuilder with @ApplicationScoped when you really need it.
2
The value for the timer.period property is defined in src/main/resources/application.properties of the example project.
Tip

Please refer to the Quarkus Dependency Injection guide for more details.

5.1. Accessing CamelContext
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To access CamelContext just inject it into your bean: 

import javax.inject.Inject;
import javax.enterprise.context.ApplicationScoped;
import java.util.stream.Collectors;
import java.util.List;
import org.apache.camel.CamelContext;

@ApplicationScoped
public class MyBean {

    @Inject
    CamelContext context;

    public List<String> listRouteIds() {
        return context.getRoutes().stream().map(Route::getId).sorted().collect(Collectors.toList());
    }
}
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5.2. CDI and the Camel Bean component
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5.2.1. Refer to a bean by name
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To refer to a bean in a route definition by name, just annotate the bean with @Named("myNamedBean") and @ApplicationScoped. The @RegisterForReflection annotation is important for the native mode. 

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Named;
import io.quarkus.runtime.annotations.RegisterForReflection;

@ApplicationScoped
@Named("myNamedBean")
@RegisterForReflection
public class NamedBean {
    public String hello(String name) {
        return "Hello " + name + " from the NamedBean";
    }
}
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Then you can use the myNamedBean name in a route definition: 

import org.apache.camel.builder.RouteBuilder;
public class CamelRoute extends RouteBuilder {
    @Override
    public void configure() {
        from("direct:named")
                .to("bean:namedBean?method=hello");
    }
}
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