Context

Context Component

Available as of Camel 2.7

The context component allows you to create a CamelContext with a number of routes inside then treat it as a black box and refer to the local endpoints within the black box from other CamelContexts.

It is similar to the Routebox component, though the Context component tries to be really simple for end users; just a simple convention over configuration approach to refer to local endpoints inside a black box (CamelContext).

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-context</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

context:camelContextId:localEndpointName[?options]

Or you can omit the "context:" prefix.

camelContextId:localEndpointName[?options]

• camelContextId is the ID you used to register the CamelContext into the Registry.
• localEndpointName can be a valid Camel URI evaluated within the black box CamelContext. Or it can be a logical name which is mapped to any local endpoints. For example if you locally have endpoints like direct:invoices and seda:purchaseOrders inside a CamelContext of id supplyChain, then you can just use the URIs supplyChain:invoices or supplyChain:purchaseOrders to omit the physical endpoint kind and use pure logical URIs.

You can append query options to the URI in the following format, ?option=value&option=value&...

Example

First you need to create a CamelContext, add some routes in it, start it and then register the CamelContext into the Registry (JNDI, Spring, Guice or OSGi etc).

This can be done in the usual Camel way from this test case; this example shows Java and JNDI being used...

// lets create our black box as a camel context and a set of routes
DefaultCamelContext blackBox = new DefaultCamelContext(registry);
blackBox.setName("blackBox");
blackBox.addRoutes(new RouteBuilder() {
    @Override
    public void configure() throws Exception {
        // receive purchase orders, lets process it in some way then send an invoice
        // to our invoice endpoint
        from("direct:purchaseOrder").
          setHeader("received").constant("true").
          to("direct:invoice");
    }
});
blackBox.start();

registry.bind("accounts", blackBox);

Notice in the above route we are using pure local endpoints (*direct* and *seda). Also note we expose this CamelContext using the **accounts* ID. We can do the same thing in Spring via

<camelContext id="accounts">
  <route> 
    <from uri="direct:purchaseOrder"/>
    ...
    <to uri="direct:invoice"/>
  </route>
</camelContext>

Then in another CamelContext we can then refer to this "accounts black box" by just sending to *accounts:purchaseOrder* and consuming from *accounts:invoice*.

If you prefer to be more verbose and explicit you could use *context:accounts:purchaseOrder* or even *context:accounts:direct://purchaseOrder* if you prefer. But using logical endpoint URIs is preferred as it hides the implementation detail and provides a simple logical naming scheme.