I'm running a vertx java web server to handle large body requests. In order to avoid memory overflow, I'm using the vertx backpressure mechanism with a Pump and implementation of the WriteStream interface which works properly to pause/resume the socket.
Changing the TCP receive buffer size (HttpServerOptions) is a good way to slow down the increase of the virtual memory when the server receives a large request but cannot limit it.
So I need the writeQueueFull method to return true when the vertx input buffer size reaches a given threshold. The problem is that I haven't found a way to monitor this memory amount that vertx uses at runtime.
I could simply look at the JVM memory usage (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) to take the pause/resume decision but it's not very precise. Is there another way?
Thanks