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Chapter 15. Groovy

Overview
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Groovy is a Java-based scripting language that allows quick parsing of object. The Groovy support is part of the camel-script module.

Adding the script module
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To use Groovy in your routes you need to add a dependency on camel-script to your project as shown in Example 15.1, “Adding the camel-script dependency”.

Example 15.1. Adding the camel-script dependency

<!-- Maven POM File -->
<properties>
  <camel-version>2.12.0.redhat-610379</camel-version>
  ...
</properties>

<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-script</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>
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Static import
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To use the groovy() static method in your application code, include the following import statement in your Java source files: 
import static org.apache.camel.builder.camel.script.ScriptBuilder.*;
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Built-in attributes
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Table 15.1, “Groovy attributes” lists the built-in attributes that are accessible when using Groovy.
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Table 15.1. Groovy 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
propertiesorg.apache.camel.builder.script.PropertiesFunctionFunction with a resolve method to make it easier to use the properties component inside scripts.
The attributes all set at ENGINE_SCOPE.

Example
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Example 15.2, “Routes using Groovy” shows two routes that use Groovy scripts.

Example 15.2. Routes using Groovy

<camelContext>
  <route>
    <from uri=""mock:mock0" />
    <filter>
      <language language="groovy">request.lineItems.any { i -> i.value > 100 }</language>
      <to uri="mock:mock1" />
    </filter>
  </route>
  <route>
    <from uri="direct:in"/>
    <setHeader headerName="firstName">
      <language language="groovy">$user.firstName $user.lastName</language>
    </setHeader>
    <to uri="seda:users"/>
  </route>
</camelContext>
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Using the properties component
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To access a property value from the properties component, invoke the resolve method on the built-in properties attribute, as follows: 
.setHeader("myHeader").groovy("properties.resolve(PropKey)")
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Where PropKey is the key of the property you want to resolve, where the key value is of String type.
For more details about the properties component, see .
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