Camel has several endpoint components that support the Messaging Gateway from the EIP patterns.
Components like Bean and CXF provide a a way to bind a Java interface to the message exchange.
However you may want to read the Using CamelProxy documentation as a true Messaging Gateway EIP solution.
Another approach is to use @Produce which you can read about in POJO Producing which also can be used as a Messaging Gateway EIP solution.
Using This Pattern
If you would like to use this EIP Pattern then please read the Getting Started, you may also find the Architecture useful particularly the description of Endpoint and URIs. Then you could try out some of the Examples first before trying this pattern out.