Mustache

Table of Contents

URI format
Options
Mustache Context
Dynamic templates
Samples
The Email Sample
See Also

Available as of Camel 2.12

The mustache: component allows for processing a message using a Mustache 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:

<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-mustache</artifactId>
<version>x.x.x</version> <!-- use the same version as your Camel core version -->
</dependency>

URI format

mustache:templateName[?options]

Where templateName is the classpath-local URI of the template to invoke; or the complete URL of the remote template (eg: file://folder/myfile.mustache).

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

Options

{% raw %}

The Mustache component supports 1 options which are listed below.

{% raw %}

NameJava TypeDescription

mustacheFactory

MustacheFactory

To use a custom MustacheFactory

{% endraw %}

The Mustache component supports 6 endpoint options which are listed below:

{% raw %}

NameGroupDefaultJava TypeDescription

resourceUri

producer

 

String

Required Path to the resource or a reference to lookup a bean in the Registry to use as the resource

contentCache

producer

false

boolean

Sets whether to use resource content cache or not

encoding

producer

 

String

Character encoding of the resource content.

endDelimiter

producer

}}

String

Characters used to mark template code end.

startDelimiter

producer

{{

String

Characters used to mark template code beginning.

synchronous

advanced

false

boolean

Sets whether synchronous processing should be strictly used or Camel is allowed to use asynchronous processing (if supported).

{% endraw %}

{% endraw %}

Mustache Context

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

keyvalue

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.

HeaderTypeDescriptionSupport Version

MustacheConstants.MUSTACHE_RESOURCE_URI

String

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

 

MustacheConstants.MUSTACHE_TEMPLATE

String

The template to use instead of the endpoint configured.

 

Samples

For example you could use something like:

from("activemq:My.Queue").
to("mustache:com/acme/MyResponse.mustache");

To use a Mustache 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:

from("activemq:My.Queue").
to("mustache:com/acme/MyResponse.mustache").
to("activemq:Another.Queue");

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

from("direct:in").
setHeader(MustacheConstants.MUSTACHE_RESOURCE_URI).constant("path/to/my/template.mustache").
to("mustache:dummy");

The Email Sample

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

Dear {{headers.lastName}}}, {{headers.firstName}}

Thanks for the order of {{headers.item}}.

Regards Camel Riders Bookstore
{{body}}

See Also