WebService with VM in Mule

We all know how to expose a CXF based SOAP web services in Mule.How about exposing the web service by decomposing a complex flow into smaller part with VM component ??

Mule supports VM transport, which by default uses in-memory queues but can optionally be configured to use persistent queues.The VM transport has often been used to implement complex integrations, where the flow is big and complex and need to be broken into smaller parts for better control.

One main reason to use this architecture, is that we can fragment the logic into smaller pieces and can connect it and decouple each event, and is done mainly for high performance and high control.

So now, we will see how easy it is to configure and expose a CXF web service with VM component in Mule.

And for this we need to have 2 separate flow to expose the web service.

Advantage with breaking the flow with a queue :-• Help to control on each event queue• It also reduce the complexity in the Mule flow, where there is a large Mule flow

with different functionality.• The service can be well-conditioned to load• Preventing resources from being over committed when demand exceeds service

capacity. • The message flow will be faster compared to other queue services like ActiveMq.

So, let’s create our flow to expose a CXF web service by breaking the flow into 2 parts connected with VM components as follows :-

You can see that we have used a set property after CXF component to store the method name which is actually SOAP action here as the message properties generally get lost if passed through a VM queue.

Our Mule config will be following :-

You can see in flow2 the SOAP action stored is provided as entry point for web service implementing java class

Now, we can test our web service in SOAPUI and see that the web service is generating a response which means it is working perfectly

So, if we are exposing a web service using VM endpoints the first thing we should keep in mind is to store the outbound properties of the message before sending the message to the VM outbound endpoint .

The main reason of doing is to protect the properties and get it in our next flow, since a message may loose it’s outbound properties while passing through a VM.

In my next slide I will bring some other techniques of implementing VM endpoint in our flow.Hope you have enjoyed this simpler version. Keep sharing your knowledge everywhere and let our mule community grow

So, Happy coding …

Thank You