July 2017
Intermediate to advanced
466 pages
11h 24m
English
Content preview from Java 9 Programming Blueprints
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Getting updates
So far, we can see all of the conversations, view individual messages in a conversation, and send new messages. What we can't do yet is get updates when new messages arrive on the device, so let's implement that now, starting with the server piece this time.
To get a constant stream of events, we'll use a feature called Server-Sent Events, a W3C specification for receiving push notifications from the server. We enabled this feature in Jersey by registering the SseFeature in both the client and server setup steps. To create an SSE endpoint, we specify that the method returns the media type SERVER_SENT_EVENTS, and we return an EventOutput as the payload:
@GET @Path("status") @Produces(SseFeature.SERVER_SENT_EVENTS) @Secure ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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