Fuse IDE - Tutorials - Chapter 3. Adding a Content-Based Router

Chapter 3. Adding a Content-Based Router

This tutorial walks you through adding a content-based router to a route.

Goals

In this tutorial you will:

add a content based-router to a route
configure a content-based router
rewire a route to use the content-based router

Prerequisites

To complete this tutorial you will need:

the project created in Creating a New Route

Procedure

To add a content-based router to your route:

Open the camelContext.xml file in the src/main/resources/META-INF/spring folder of your simple-route project.
Drag a Choice element () from the Routing section of the pallet onto the route1 section of the editor canvas.
The choice node will show up on the editor canvas.
With the choice node selected, open the context menu.
Select Add|When.
A when node (), with a connection to the choice node, appears on the canvas and the property editor is configured to edit the when node as shown in Figure 3.1.
Figure 3.1. When property editor
Enter /person/city = 'London' into the property editor's Expression field.
This XPath expression is used to determine which messages will follow this path in the route.
Select xpath from the Language drop down list.
Select the choice node on the canvas.
Select Add|Otherwise from the context menu.
An otherwise node (), with a connection to the choice node, appears on the canvas. The otherwise node is used to route any messages that are not matched by one of the when nodes.
Click on the first endpoint in the route and drag a connector to the choice node.
A connector will appear connecting the endpoint with the choice.
Click on the otherwise node and drag a connector the terminal endpoint in the route.
A connector will appear connecting the otherwise node with the endpoint.
Select the connector between the two endpoints.
Select Edit|Delete to delete the connector.
Tip
The connector's context menu includes a Delete item.
Drag an Endpoint element () from the pallet into the route square.
Enter file:target/messages/uk in the Uri field.
Click on the when node and drag a connector the new endpoint.
The route on the canvas should resemble Figure 3.2.
Figure 3.2. Completed content-based router
Select File|Save to save the completed route.

	Tip
The connector's context menu includes a Delete item.

Click the Source tab on the bottom of the editor canvas.

You will see the XML for the route. The camelContext element will look like Example 3.1.

Example 3.1. XML for content-based router

<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route id="route1">
    <from uri="file:src/data?noop=true"/>
    <choice>
      <when id="when1">
        <language language="xpath">/person/city = 'London'</language>
        <to uri="file:target/messages/uk"/>
      </when>
      <otherwise id="otherwise1">
        <to uri="file:target/messages"/>
      </otherwise>
    </choice>
  </route>
</camelContext>

Next steps

You can run the new route as described in Running the route.

Chapter 3. Adding a Content-Based Router

Goals

Prerequisites

Procedure

Next steps

Further reading