JavaScript

Overview

JavaScript, also known as ECMAScript is a Java-based scripting language that allows quick parsing of object. The JavaScript support is part of the camel-script module.

Adding the script module

To use JavaScript in your routes you need to add a dependency on camel-script to your project as shown in Example 7, “Adding the camel-script dependency”.

Example 7. Adding the camel-script dependency

<!-- Maven POM File -->
<properties>
  <camel-version>2.11.0-fuse-00-xx</camel-version>
  ...
</properties>

<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-script</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>

Built-in attributes

Table 4, “JavaScript attributes” lists the built-in attributes that are accessible when using JavaScript.

Table 4. JavaScript attributes

AttributeTypeValue
contextorg.apache.camel.CamelContextThe Camel Context
exchangeorg.apache.camel.ExchangeThe current Exchange
requestorg.apache.camel.MessageThe IN message
responseorg.apache.camel.MessageThe OUT message

The attributes all set at ENGINE_SCOPE.

Example

Example 8, “Route using JavaScript” shows a route that uses JavaScript.

Example 8. Route using JavaScript

<camelContext>
  <route>
    <from uri="direct:start"/>
    <choice>
      <when>
        <langauge langauge="javaScript">request.headers.get('user') == 'admin'</langauge>
        <to uri="seda:adminQueue"/>
      </when>
      <otherwise>
        <to uri="seda:regularQueue"/>
      </otherwise>
    </choice>
  </route>
</camelContext>