Java EE 8 Cookbook

How it works...

We started with our SSE engine, the ServerEvent class, and a JAX-RS endpoint—these hold all the methods that we need for this recipe.

Let's understand the first one:

    @Path("start")    @POST    public Response start(@Context Sse sse) {        final UserEvent process = new UserEvent(sse);        POOL.put(process.getId(), process);        executor.submit(process);        final URI uri = UriBuilder.fromResource(ServerSentService.class).        path("register/{id}").build(process.getId());        return Response.created(uri).build();    }

Following are the main points:

1. First things first—this method will create and prepare an event to be sent by the server to the clients.
2. Then, the just created event is put in a HashMap called POOL.
3. Then our event is attached to a URI that represents ...