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STOMP and Spring also allow us to set up topics, where every subscriber will receive the same message.
This is going to be very useful for tracking active users.
That said, it does work, and that's good enough for me for now.
Since we're writing a chat client, we need some way of modeling a message, as shown below: We also need a place to send messages to; in this case a controller just like you would create in Spring MVC: There's some interesting stuff happening here. In our controller we're also assigning the sender ourselves based on the session information that Spring Security has identified, as allowing the client to specify who the sender was produces the same problem the email spec currently has.
It's worth noting here that the message is sent to both the sender and the recipient, indicating that the message has passed through the server before being seen in the sender's client's chat window.
I have a love/hate relationship with frameworks that are automagical. Often times automagical frameworks have rules, usually modeled by conventions. Sometimes it tells you something that you can't accurately discern without digging into the bowels of the code that you're trying to leverage without creating bowels yourself.
On one hand, they can save you a lot of time and effort, preventing you from writing tons of boilerplate code, and just less code in general (every line of code is one you have to support, right? If you violate these, the framework will slap you across the face with a stacktrace. In this case, Spring was guilty of said crimes on several occasions. However, in this case the solution involved going roughly shoulder deep into Spring's bowels to find simple, yet not obvious solutions to problems.