Package protocols.apps.canvas.ui

Class WebUi

java.lang.Object

protocols.apps.canvas.ui.WebUi

public final class WebUi
extends Object

A tiny embedded web UI for the canvas, built on the JDK's bundled HttpServer so the demo pulls in no HTTP dependency. It serves three static assets from the classpath (/web/index.html, app.js, style.css) and two JSON endpoints:

• GET /api/state — the current canvas grid + this node's active-view neighbours, which the page polls a few times a second;
• POST /api/paint — {"x":..,"y":..,"color":0xRRGGBB} → paints one cell (which then disseminates by gossip like any other).

Handlers run on the server's own small thread pool and call back into CanvasApp.paintFromUi(int, int, int) / CanvasApp.stateJson(), both of which are safe off the event loop (see CanvasApp's threading note).

Constructor Summary

Constructors

Constructor	Description
WebUi(int port, CanvasApp app)

Method Summary

Modifier and Type	Method	Description
void	start()	Bind and start serving.
void	stop()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

WebUi

public WebUi(int port,
 CanvasApp app)

Method Details

start

public void start()
           throws IOException

Bind and start serving. Throws if the port is unavailable.

Throws:

IOException

stop

public void stop()