About Symfony Messenger and Interoperability

The Messenger component has been merged into Symfony 4.1, released in May 2018. It adds an abstraction layer between a data producer (or publisher) and its data consumer.

Symfony is thus able to send messages (the data) in a bus, usually asynchronous. In concrete terms: our controller creates an email, sends it on a bus (RabbitMQ, Redis, Doctrine, etc.) and a consumer sends the email synchronously. The advantage is that the heavy, time-consuming or sensitive tasks can be delegated to background workers.

When data producers and consumers are in the same application, this system works very well and is totally transparent. However, if they are two different Symfony applications, or two applications in two different languages, you’re going to ha...
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