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How

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to use a dynamic URI in to()

A dynamic URI is an endpoint URI that varies depending on inflight routing information, such as Exchange properties, message headers, the body, the Camel Context, etc.

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titleDynamic To

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I want to use a dynamic URI when sending to an endpoint. How do I do that?
For example where the template name is dynamic as shown below:

- out of the box

From Camel 2.16 onwards there is a new <toD> which is a dynamic to. See more details at Message Endpoint.

 

For example, if you're using a Freemarker producer and the template location is provided inside the current message, you might expect the following code to work, but it will not.

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titleThis is not valid code

This snippet is not valid code. Read on.

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to("freemarker://templateHome/${body.templateName}.ftl")

Use the Recipient List EIP pattern, which allows you to compute the In this case, you must use an EIP (Enterprise Integration Pattern) that is capable of computing a dynamic URI using an Expressionan Expression, such as the Recipient List EIP pattern.

For example using , rewriting the snippet above to use the Simple expression language as shown below::

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titleThis is valid code

This snippet is valid code.

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recipientList(simple("freemarker://templateHome/${body.templateName}.ftl"))

Or you could use any of the other Languages.other of Camel Languages.

Info

Notice that the Recipient List can send to multiple Endpoints if the expression returns either a java.util.List, array, java.util.Iteratable or a String. If the returned value is a String then you can specify multiple endpoints separated by comma. So if you only want to send to one endpoint and use a String type, then beware of the comma. If you need to use a comma, then you can change or turn off the separator on the Recipient List.

For example, to turn it, when using Camel 2.13 onwards:

.recipientList(simple("sql:select firstName, lastName from myTable where user = ${header.user}"), "false")

And for users of Camel 2.12.x or older, we use a non existing delimiter char:

.recipientList(simple("sql:select firstName, lastName from myTable where user = ${header.user}"), "@")