Walk through another example
Introduction
We continue Continuing the walk from Walk through an example. This time our first example, we take a closer look at the routing and explains explain a few pointers - so you wont won't walk into a bear trap, but can enjoy a walk an after-hours walk to the local pub for a large beer
First we take a moment to look at the Enterprise Integration Patterns that is - the base pattern catalog for integrationsintegration scenarios. In particular we focus on the Pipes and filters EIP pattern, that is - a central pattern. This is used for: to route messages through a sequence of processing steps, each performing a specific function - much like the Java Servlet Filters.
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In this sample we want to process a message in a sequence of steps where each steps can perform their specific function. In our example we have a JMS queue for receiving new orders. When an order is received we need to process it in several steps:
- validate
- register
- send confirm email
This can be created in a route like this:
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This example is also based on the in-only message exchange pattern. What you must understand as well is the in-out message exchange pattern, where the caller expects a response. We will look into this in another example.