This out message is then forwarded to the pipeline target in
another In-Only MEP.
Using the MEP transformation property of pipeline, it is possible to construct a
protocol bridge. For example, we can bridge between a HTTP protocol (In-Out) and a
JMS (In-Only) protocol. This is what we have done in Chapter 11 (Access Web Services
using JMS Channel).
Illustrative Design
The Acme e-commerce system allows customers online to make payments and each
such payment message is routed to the financial institution's system in a secure
and reliable manner. The financial institution is Acme's payment partner and their
systems are separated in a different network and domain. Sending requests through
Internet is a feasible method, but the usual HTTP channel does not have the required
reliability. Hence there is a dedicated network between Acme and the financial
institution. Moreover, to make messaging reliable it is possible to send messages
using a reliable channel through MOM. Using JMS, we can send messages through
MOM. However, the payment service at the financial institution's end is a HTTP
service with a request-reply style.
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