jWebSocket MobileTechCon 2010 - WebSockets on Android, Symbian and BlackBerry

Stay Connected Mobile Pushing Apps with WebSockets Alexander Schulze Predrag Stojadinovic jWebSocket – Open Source Cross-Browser/Cross-Platform WebSocket Solution

Today's session ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Apps in Transition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets Basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

What we have: HTTP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Nearly Realtime Mechanisms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

TCP instead of HTTP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Establishing Connection ,[object Object],jWebSocket – Stay Connected 09/12/10 Client GET {path} HTTP/1.1 Upgrade: WebSocket Connection: Upgrade Host: {hostname}:{port} Origin: http://{host}[:{port}] Sec-WebSocket-Key1: {sec-key1} Sec-WebSocket-Key2: {sec-key2} 8 Bytes generated {sec-key3}

Establishing Connection ,[object Object],jWebSocket – Stay Connected 09/12/10 Client GET /services/chat/;room=Foyer HTTP/1.1 Upgrade: WebSocket Connection: Upgrade Host: jwebsocket.org Origin: http://jwebsocket.org Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5 Sec-WebSocket-Key2: 12998 5 Y3 1 .P00 ^n:ds[4U Server HTTP/1.1 101 WebSocket Protocol Handshake Upgrade: WebSocket Connection: Upgrade Sec-WebSocket-Origin: http://jwebsocket.org Sec-WebSocket-Location: ws://jwebsocket.org/ services/chat 8jKS'y:G*Co,Wxa-

Bi-directional data exchange ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets TCP vs. HTTP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets – Why? ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets – What for ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

HTML5 Browser ,[object Object],jWebSocket – Stay Connected 09/12/10 var lWebSocketClient = new WebSocket("ws://jwebsocket.org:8787"); // tries to open the TCP connection and to exchange handshake lWebSocketClient. onopen = function(aEvent) { // connection has successfully been established } lWebSocketClient. onmessage = function(aEvent) { // a data packet has completely been received in aEvent.data } lWebSocketClient. onclose = function(aEvent) { // the connection has been terminated } lWebSocketClient. send ("Hello World!"); // sends a UTF-8 text message to the server lWebSocketClient. close (); // terminates the connection

Compatibility ,[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Token ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

jWebSocket Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

jWebSocket JavaScript Client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

WebSockets – How? ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Android - Dalvik VM ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Low-Level-Interface ,[object Object],jWebSocket – Stay Connected 09/12/10 public interface WebSocketClient { void open (String aURL) throws WebSocketException; void send (WebSocketPacket aPacket) throws WebSocketException; void close () throws WebSocketException; boolean isConnected (); void addListener (WebSocketClientListener aListener); void removeListener (WebSocketClientListener aListener); void notifyOpened (WebSocketClientEvent aEvent); void notifyPacket (WebSocketClientEvent aEvent, WebSocketPacket(aPacket); void notifyClosed (WebSocketClientEvent aEvent); }

Listener ,[object Object],jWebSocket – Stay Connected 09/12/10 public interface WebSocketClientListener { void processOpened (WebSocketClientEvent aEvent); void processPaket (WebSocketClientEvent aEvent, WebSocketPacket aPacket); void processClosed (WebSocketClientEvent aEvent); }

Java WebSocket Client jWebSocket – Stay Connected 09/12/10

Android Demo App ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Android Fundamentals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Android Canvas Demo ,[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Android - transfer photos ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

In-house ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

Thank you for your attention! ,[object Object],[object Object],[object Object],[object Object],[object Object],jWebSocket – Stay Connected 09/12/10

jWebSocket MobileTechCon 2010 - WebSockets on Android, Symbian and BlackBerry

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