Chunk

Available as of Camel 2.15

The chunk: component allows for processing a message using a Chunk template. This can be ideal when using Templating to generate responses for requests.

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

URI format

Where templateName is the classpath-local URI of the template to invoke.

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

Options

Option

Default

Description

encoding

null

Character encoding of the resource content.

themesFolder

null

Alternative folder to scan for a template name.

themeSubfolder

null

Alternative subfolder to scan for a template name if themeFolder parameter is set.

themeLayer

null

A specific layer of a template file to use as template.

extension

null

Alternative extension to scan for a template name if themeFolder and themeSubfolder are set.

 

Chunk component will look for a specific template in themes folder with extensions .chtml or .cxml. If you need to specify a different folder or extensions, you will need to use the specific options listed above.

Chunk Context

Camel will provide exchange information in the Chunk context (just a Map). The Exchange is transferred as:

 

key

value

exchange

The Exchange itself.

exchange.properties

The Exchange properties.

headers

The headers of the In message.

camelContext

The Camel Context.

request

The In message.

body

The In message body.

response

The Out message (only for InOut message exchange pattern).

Dynamic templates

Camel provides two headers by which you can define a different resource location for a template or the template content itself. If any of these headers is set then Camel uses this over the endpoint configured resource. This allows you to provide a dynamic template at runtime.

 

Header

Type

Description

Support Version

ChunkConstants.CHUNK_RESOURCE_URI

String

A URI for the template resource to use instead of the endpoint configured.

 

ChunkConstants.CHUNK_TEMPLATE

String

The template to use instead of the endpoint configured.

 

Samples

For example you could use something like:

To use a Chunk template to formulate a response for a message for InOut message exchanges (where there is a JMSReplyTo header).

If you want to use InOnly and consume the message and send it to another destination you could use:

It's possible to specify what template the component should use dynamically via a header, so for example:

An example of Chunk component options use:

In this example Chunk component will look for the file file_example.chunk in the folder template/subfolder.

The Email Sample

In this sample we want to use Chunk templating for an order confirmation email. The email template is laid out in Chunk as:

See Also

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