CDI (2.0) Async Events

Glassfish 5 builds for Java EE 8 are rolling along… here is another Docker based example on Github. This time it’s asynchronous events in CDI 2.0 (JSR 365)

Steps

Just follow the README… just a bunch of docker commands to get started..!

What’s going on

Here is a quick summary

• A Java EE scheduler triggers asynchronous CDI events (fireAsync())
  • These CDI events are qualified (using a custom Qualifier)
  • It also uses a custom java.util.concurrent.Executor (based on the Java EE Concurrency Utility ManagedExecutorService) – thanks to the NotificationOptions supported by the CDI API
• Two (async) CDI observers (@ObservesAsync) – a JAX-RS SSE broadcaster and a Websocket endpoint
• SSE & Websocket endpoints cater to their respective clients – details on how to connect in the README

Notice the asynchronous events running in Managed Executor service thread

You can choose to let things run in the default (container) chosen thread

Further reading

• CDI 2.0 specification
• Java EE 8 based JAX-RS SSE example
• Java EE on Github

Cheers!