Over a million developers have joined DZone.

Unveiling RxMule

· Java Zone

What every Java engineer should know about microservices: Reactive Microservices Architecture.  Brought to you in partnership with Lightbend.

I'm super excited to announce RxMule, my latest open source project. RxMule provides reactive extensions for Mule ESB, via a set of specific bindings for RxJava.

For several years, I've been mulling over the idea of creating a DSL for configuring Mule. Indeed, there is a treasure trove of pre-existing transports and connectors for Mule, which is very compelling for anyone building connected applications (which, nowadays, is probably everybody). Unfortunately developers can be put off by the XML-based DSL used to configure Mule, and thus may pass the opportunity to leverage all this available goodness.

As Rx is gaining traction, more and more developers are getting accustomed to its concepts and primitives. With this mind, and knowing that Mule is at core an event processing platform, it dawned on me that instead of creating a DSL that would mimic the XML artifacts (which are Mule specific), I'd rather create bindings to allow using Mule's essential moving parts via Rx.

In summary, RxMule adds a number of classes to RxJava that make it possible to observe: 

In short, RxMule allows creating Observable<MuleEvent> instances from different sources. AMuleEvent is what Mule creates and processes. It wraps a MuleMessage which contains the actual data and meta-data that's being processed.

You can read more about the structure of a MuleMessage here.

The following demonstrates an asynchronous HTTP-to-Redis bridge, that only accepts one request per remote IP: 

    .observeEndpointAsync(new URI("http://localhost:8080/publish"))
        muleEvent -> {
            final String remoteAddressAndPort =
            return substringBefore(remoteAddressAndPort, ":");
            muleEvent -> {
                LOGGER.info("Published: {}", muleEvent);
So why don't you take RxMule for a spin and see if it helps you achieving your application and API integration needs: with Mule at its core, I bet it will! Bug reports and pull requests are welcome at GitHub.

Microservices for Java, explained. Revitalize your legacy systems (and your career) with Reactive Microservices Architecture, a free O'Reilly book. Brought to you in partnership with Lightbend.


Published at DZone with permission of David Dossot, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

The best of DZone straight to your inbox.

Please provide a valid email address.

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}