Apache Camel exec with args

Question

When using the exec component is it possible to specify args inline rather than having to set them in the ExecBinding.EXEC_COMMAND_ARGS?

For example I have this Route:

from("seda:getPolicyListStart")
.process(new Processor() {
    public void process(Exchange e) {
        ClientRequestBean requestBean = (ClientRequestBean)e.getIn().getBody();
        List<String> args = new ArrayList<String>();
        args.add(requestBean.getClient());
        args.add(requestBean.getSort());
        e.getOut().setHeader(ExecBinding.EXEC_COMMAND_ARGS, args);
    }
})
.to("exec:some_command?useStderrOnEmptyStdout=true")
.convertBodyTo(String.class)
.log("Executed OS cmd and received: ${body}")

However I would have thought that I could use the Simple Expression Language to simplify it like so:

from("seda:getPolicyListStart")
.to("exec:some_command?useStderrOnEmptyStdout=true&args=${body.client} ${body.sort}")
.convertBodyTo(String.class)
.log("Executed OS cmd and received: ${body}")

Similar to how you can use File Language (a subset of Simple) when you use the File Component.

Is it possible? If not, can the first example be simplified?

Answer 1

The answer is in the EIP patterns. You need to use the dynamic recipient list EIP pattern when you compute an endpoint destination at runtime.

http://camel.apache.org/recipient-list.html

The recipient list accepts an expression which means you can use the Simple language to construct the parameters at runtime