Camel how to add something to registry - with java, in general

Question

sometimes I have to add an object to camel registry (of course with java). In most cases it is a dataSource .

My problem is I can\'t figure out a general working way

Answer 1

If you're using the camel-spring package, you can use Spring to manage the registry. Here's an example of code I used to add a singleton bean in Java through Spring:

MyApplicationContext.xml

MyApplication.java

public class MyApplication {
    public static void main(final String[] args) {
        final FileSystemXmlApplicationContext context = new FileSystemXmlApplicationContext("/path/to/MyApplicationContext.xml");
    }
}

MyRouteBuilder.java

public void MyRouteBuilder extends RouteBuilder implements ApplicationContextAware {
    @Override
    public void configure() {
        from("ftps://localhost:21/foo?pollStrategy=#myPollingStrategy")
            .log("${body}");
    }

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) {
        final ConfigurableApplicationContext context  = (ConfigurableApplicationContext)applicationContext;
        final DefaultListableBeanFactory     registry = (DefaultListableBeanFactory)context.getBeanFactory();
        registry.registerSingleton("myPollingStrategy", new MyPollingStrategy());
    }
}

The important part here is to implement the ApplicationContextAware interface in the class that you want to use to manually add beans to the registry. This interface can be implemented on any bean that Spring initializes; you don't have to use your RouteBuilder. In this case, the bean is created on startup during the setApplicationContext(...) execution before configure() is called, but you can also store the application context for use later (which is probably a more common usage).

This was tested with Camel 2.19.0 and Spring 4.3.10-RELEASE.