Java EE 8 Cookbook

How it works...

This recipe is made up of three parts:

• The server, represented by the ServerMock class
• The SSE engine, represented by the SseResource class
• The client, represented by the ClientConsumer class

So once ServerMock is instantiated, it registers the SseResource class:

final ResourceConfig resourceConfig = new ResourceConfig(SseResource.class);final HttpServer server = GrizzlyHttpServerFactory.createHttpServer(CONTEXT, resourceConfig, false);server.start();

Then two key methods from SseResource take place. The first one adds messages to the server queue:

addMessage(final String message, @Context Sse sse)

The second one consumes this queue and sends the messages to the clients:

@GET@Produces(MediaType.SERVER_SENT_EVENTS)public ...