Also, if there are several different implementations of the same service, a mechanism for choosing the most appropriate target service for each incoming request can be implemented within the gateway.

We can just change the order of these gateway pairs.

A service gateway looks like a service but is only available for use on partitions and not service providers.

This article focuses solely on the gateway part and does not cover the ESB part any further.

With the service enabled, everything's in place to send messages to these two gateways.