<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Orbiter Share Application State</title> <!--CSS--> <style type="text/css"> #outPane { border: inset 2px; height: 200px; width: 500px; overflow: auto; padding: 5px; margin-bottom: 5px } </style> <!--Load the Orbiter JavaScript library (non-minified version). Use during development.--> <script type="text/javascript" src="http://unionplatform.com/cdn/Orbiter_latest.js"></script> <!--Load the Orbiter JavaScript library (minified version). Use for production.--> <!--<script type="text/javascript" src="http://unionplatform.com/cdn/Orbiter_latest_min.js"></script>--> <!--Application code--> <script type="text/javascript"> //============================================================================== // VARIABLES //============================================================================== var orbiter; var appRoom; //============================================================================== // INITIALIZATION //============================================================================== function init () { // Create the Orbiter instance, used to connect to and communicate with Union, // then enable automatic reconnection (one attempt every 15 seconds) orbiter = new net.user1.orbiter.Orbiter(); orbiter.getConnectionMonitor().setAutoReconnectFrequency(15000); orbiter.getLog().setLevel(net.user1.logger.Logger.DEBUG); // If required JavaScript capabilities are missing, abort if (!orbiter.getSystem().isJavaScriptCompatible()) { displayMessage("Your browser is not supported."); return; } // Register for Orbiter's connection events orbiter.addEventListener(net.user1.orbiter.OrbiterEvent.READY, readyListener, this); orbiter.addEventListener(net.user1.orbiter.OrbiterEvent.CLOSE, closeListener, this); displayMessage("Connecting to Union..."); // Connect to Union Server orbiter.connect("tryunion.com", 80); } //============================================================================== // ORBITER EVENT LISTENERS //============================================================================== // Triggered when the connection is ready function readyListener (e) { displayMessage("Connected."); displayMessage("Joining room..."); // Create the application room on the server. Configure the room to exist // until the next time Union Server shuts down. var settings = new net.user1.orbiter.RoomSettings(); settings.removeOnEmpty = false; appRoom = orbiter.getRoomManager().createRoom("examples.shareAppStateRoom", settings); appRoom.addEventListener(net.user1.orbiter.RoomEvent.JOIN, joinRoomListener); appRoom.addEventListener(net.user1.orbiter.AttributeEvent.UPDATE, roomAttributeUpdateListener); // Join the application room appRoom.join(); } // Triggered when the connection is closed function closeListener (e) { displayMessage("Orbiter connection closed."); } //============================================================================== // ROOM EVENT LISTENERS //============================================================================== // Triggered when the room is joined function joinRoomListener (e) { displayMessage("Application room joined."); // Display the shared application state if (appRoom.getAttribute("numOccupantsLifetime") == null) { displayMessage("You are the first client to join this room."); } else { displayMessage("The last time a client joined the room was:"); displayMessage(new Date(parseFloat(appRoom.getAttribute("lastOccupantJoinedAt")))); displayMessage("Number of clients that have ever joined the room:"); // Add one because the current client hasn't been counted yet displayMessage(parseInt(appRoom.getAttribute("numOccupantsLifetime"))+1); } // Update the shared application state... // Set lastOccupantJoinedAt to the approximate current time on the server appRoom.setAttribute("lastOccupantJoinedAt", orbiter.getServer().getServerTime().toString()); // Add one to the numOccupantsLifetime attribute appRoom.setAttribute("numOccupantsLifetime", "%v+1", true, false, true); } function roomAttributeUpdateListener (e) { // If the room's attributes change after it has been synchronized... if (appRoom.getSyncState() == net.user1.orbiter.SynchronizationState.SYNCHRONIZED) { // ...and the client that changed the attribute was *not* the current client if (e.getChangedAttr().byClient != orbiter.self()) { // ...then display a message for the changed attribute if (e.getChangedAttr().name == "lastOccupantJoinedAt") { displayMessage("UPDATE! A client joined at:"); displayMessage(new Date(parseFloat(appRoom.getAttribute("lastOccupantJoinedAt")))); } else if (e.getChangedAttr().name == "numOccupantsLifetime") { displayMessage("UPDATE! New number of clients that have ever joined the room:"); displayMessage(parseInt(appRoom.getAttribute("numOccupantsLifetime"))); } } } } //============================================================================== // UI //============================================================================== // Displays a single message on screen function displayMessage (message) { // Make the new message element var msg = document.createElement("span"); msg.appendChild(document.createTextNode(message)); msg.appendChild(document.createElement("br")); // Append the new message to the output pane var outPane = document.getElementById("outPane"); outPane.appendChild(msg); // Trim the chat to 500 messages if (outPane.childNodes.length > 500) { outPane.removeChild(outPane.firstChild); } outPane.scrollTop = outPane.scrollHeight; } </script> </head> <body onload="init()"> <!--Contains the output pane--> <div id="outPane"></div> </body> </html>