Photostream App – Part 2

In the the second part of the “Photostream” trilogy, we will look at how the server notifies all the clients who are observing its stream. There are 2 ways we can do this; either by using server sent events or with websocket.

Since JavaEE 7 supports websocket I’ll be using websocket. Websocket is a 2 way communication channel. In photostream app, the notification/data only flows on way viz. from the server to the client (those observing our photostream) so server sent event (SSE) is actually more appropriate. But to use SSE in JavaEE (in Glassfish/Payara in particular), you have to use add additional libraries.

In you’re using Glassfish/Payara and you would like to try SSE, see this document.

The source code for part 2 is available here.

Till next time.

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