Available as of Camel 2.5
The language component allows you to send Exchange to an endpoint which executes a script by any of the supported Languages in Camel.
By having a component to execute language scripts, it allows more dynamic routing capabilities. For example by using the Routing Slip or Dynamic Router EIPs you can send messages to
language endpoints where the script is dynamic defined as well.
This component is provided out of the box in
And from Camel 2.11 onwards you can refer to an external resource for the script using same notation as supported by the other Languages in Camel
The component supports the following options.
The name of the Language to use, such as
The script to execute.
Whether or not the result of the script should be used as the new message body. By setting to
Camel 2.9: Whether to cache the script if loaded from a resource.
Camel 2.13/2.12.2/2.11.3: Whether to cache the compiled script. Turning this option on can gain performance as the script is only compiled/created once, and reuse when processing Camel messages. But this may cause side-effects with data left from previous evaluation spills into the next, and concurrency issues as well. If the script being evaluated is idempotent then this option can be turned on.
Camel 2.14.1: Whether the script is binary content. This is intended to be used for loading resources using the Constant language, such as loading binary files.
The following message headers can be used to affect the behavior of the component
The script to execute provided in the header. Takes precedence over script configured on the endpoint.
ExamplesGroovy language, such as this example where the input message will by multiplied with 2: You can also provide the script as a header as shown below. Here we use XPath language to extract the text from the
Loading scripts from resources
Available as of Camel 2.9
You can specify a resource uri for a script to load in either the endpoint uri, or in the
The uri must start with one of the following schemes: file:, classpath:, or http:
For example to load a script from the classpath:By default the script is loaded once and cached. However you can disable the
contentCacheoption and have the script loaded on each evaluation.
For example if the file myscript.txt is changed on disk, then the updated script is used: From Camel 2.11 onwards you can refer to the resource similar to the other Languages in Camel by prefixing with
"resource:"as shown below: