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Step-by-Step Guide to Use Anypoint MQ: Part 4

This is the last part of the Anypoint MQ Series. You can read previous parts here: Part 1; Part 2; Part 3. In this post, we will learn about message exchanges and how we can use the  to send messages to multiple queues. We will also see how we can bind queues and publish messages to a message exchange. We may need to send the same message to more than one queue (to broadcast the message); in that scenario, message exchanges can be used.

What Is a Message Exchange?

A message exchanges bind one or more queues so that the message sent to exchange appears in all the queues bound to it simultaneously. In other words, with message exchanges, we can send the same message to all the queues which are bound to it.

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Custom Policy in Mule 4

Custom Policy in Mule 4

Mule provides a set of policies beforehand, but there might be a requirement that is not covered by predefined policies. In such cases, a custom policy can be developed. The process is a three-step workflow:

  • Developing the policy
  • Deploying/Uploading the policy to exchange
  • Applying the policy on API
You might also like:  Working With Custom Policy in Mule 4

Setting up and Creating the Project

Before diving into the development, setup Maven to create the required project structure.
In settings.xml , under the  profiles section, add the below profile: 
<profile>
<id>archetype-repository</id>
<repositories>
<repository>
<id>archetype</id>
<name>MuleRepository</name>
<url>https://repository-master.mulesoft.org/nexus/content/repositories/public</url>
<releases>
<enabled>true</enabled>
<checksumPolicy>fail</checksumPolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<checksumPolicy>warn</checksumPolicy>
</snapshots>
</repository>
</repositories>
</profile>