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Writing Portable WebSockets in Java

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jfarcand

The document discusses the development and implementation of portable WebSocket in Java, highlighting the advantages of bi-directional communication and the WebSocket API standardized by W3C and IETF. It covers various frameworks, libraries, and protocols associated with WebSockets, including Atmosphere, and offers examples of their usage in different server environments. Additionally, it addresses potential pitfalls of using only WebSocket-based frameworks in production and promotes the open-source nature of the Atmosphere project.

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Writing Portable WebSocket in Java Jeanfrancois Arcand twitter.com/jfarcand
Pardon? • Worked 10 years for Sun Microsystems • Active Commiter on Tomcat 4/5 • Active Commiter GlassFish 1/2/3 • Glassfish v3 extensible container kernel • Performance/Scalability • Creator of the Grizzly NIO Framework • Creator of the AHC (AsyncHttpClient) library • Creator of Atmosphere
Atmosphere Apache 2 Github ~470 « followers » Client + Supported server ~25 frameworks Scala, Groovy, JRuby, Java Since 2008 20 000 downloads per months 1.0.0.beta3
Atmosphere Apache 2 Github ~450 « followers » Client + Supported EXTREMEL server ~25 Y ACTIVE frameworks !!! Scala, Groovy, JRuby, Java Since2008 20 000 downloads per months 1.0.0.beta2
Today’s Presentation WebSocket
Today’s Presentation WebSocket Definition
Today’s Presentation WebSocket Definition Free for all!!!
Today’s Presentation WebSocket C’est quoi Definition Free for Free for all!!! all! Atmospher e
Today’s Presentation WebSocket Definition Free for all! Atmospher e Concepts
Today’s Presentation WebSocket C’est quoi Definition Free for all!!! all! Atmospher e Concepts Demo
WebSockets is a web technology providing for bi-directional, full-duplex communications channels over a single TCP connection. The WebSocket API is being standardized by the W3C, and the WebSocket protocol has been standardized by the IETF as RFC 6455
Before (Long-Polling) Request Browse Server r
Before (Long-Polling) Request Browse Server r
Before (Long-Polling) Request Browse Server r Response
Oups!! Request Browse None Server r
Oups! Request Browse Server r Zzzz
Better! Request Browse Server r Cache
Better! Request Browse Server r Cache
Pushing the Protocol (HTTP Streaming) Request Browse Server r
Pushing the Protocol (HTTP Streaming) Request Browse Server r
Pushing the Protocol (HTTP Streaming) Request Browse Server r Response
Pushing the Protocol (HTTP Streaming) Request Browse Server r Response Response
Oups!! Request Browse Server r Hell!!! Response Response
Pushing the Protocol (HTTP Streaming) Request Browse Server r Hell!!! Hack Response Response
Oups!!! Request Browse Server r Response Proxy Response
Better Request Browse Server r Response Cache Response
Better Request Browse Server r Response Cache « HeartBeat Response »
Better: Server Side Events (SSE) Request Browse Server r Response Response
Oups!!! Request Browse Server r Response Proxy Response
Better Request Browse Server r Response Cache « HeartBeat Response »
WebSockets Hanshake Browse Server r
WebSockets Hanshake Browse Server r OK
WebSockets Request Browse Server r
WebSockets Request Browse Server r
WebSockets Browse Server r Response
WebSockets Request Browse Server r
WebSockets Request Request Browse Server r
WebSockets Request Request Browse Server r
WebSockets Browse Server r Response Response
Anytime Browse Server r Response
Life is good, lalalalalala Browse Server r Response
Oups!! Browse Server r Response Proxy
Better! Browse Server r Response Cache
First Request T 127.0.0.1:65062 -> 127.0.0.1:8080 [AP] GET / HTTP/1.1. Upgrade: websocket. Connection: Upgrade. Host: 127.0.0.1:8080. Origin: http://127.0.0.1:8080. Sec-WebSocket-Key: Tz9qdt3lmte6Slf+GvpRqQ==. Sec-WebSocket-Version: 13. Sec-WebSocket-Extensions: x-webkit-deflate- frame.
Response T 127.0.0.1:8080 -> 127.0.0.1:51292 [AP] HTTP/1.1 101 Switching Protocols. Upgrade: WebSocket. Connection: Upgrade. Sec-WebSocket-Accept: HVXA7SqH5uYeN6aD9tZ0JQbfTJA=.
Life is good, lalalalalala T 127.0.0.1:8080 -> 127.0.0.1:51292 [AP] HTTP/1.1 101 Switching Protocols. Upgrade: WebSocket. Connection: Upgrade. Sec-WebSocket-Accept: HVXA7SqH5uYeN6aD9tZ0JQbfTJA=.
OUPS!!! T 127.0.0.1:8080 -> 127.0.0.1:65064 [AP] HTTP/1.1 501 Not Implemented. Server: Apache-Coyote/1.1. X-Atmosphere-error: Websocket protocol not supported. Transfer-Encoding: chunked. Date: Fri, 15 Jun 2012 10:06:30 GMT. Connection: close. .
WebSocket API – Standard JavaScript websocket = new WebSocket(wsUri); websocket.onopen = function(evt) { …}; websocket.onclose = function(evt) { …}; websocket.onmessage = function(evt) { …}; websocket.onerror = function(evt) { …}; webSocket.send(…)
WebSocket API – Java Jetty 7, GlassFish 3.1, Netty 3, Tomcat 7.0.27, Resin 4, JBoss Plugin JSR 356: http://jcp.org/en/jsr/detail?id=356 AHC (Client -> De facto) http://github.com/sonatype/async-http- client
Life is good, lalalalalala
OUPS!!!
Ready? Safari Tomcat 7 Firefox Jetty7 Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Firefox Jetty7 Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Firefox Jetty7 Imdat!! Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Streamin Jetty7 Firefox g Imdat!! Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Streamin Jetty7 Firefox g Imdat!!SSE Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Streamin Jetty7 Firefox g Imdat!!SSE Jetty8 Chrome GlassFis Opera JSONP h3. GlassFis IE h 312
Free for all Safari Tomcat 7 Streamin Jetty7 Firefox g Imdat!!SSE Jetty8 Chrome GlassFis Opera Long JSONP h3. GlassFis IE Polling h 312
Safari Tomcat 7 Firefox Jetty7 Atmosphere Chrome to the Jetty8 rescue!!! GlassFis Opera h3. GlassFis IE h 312
Atmosphere -WebSockets Safari Tomcat 7 Jetty7 Atmosphere API Firefox atmosphere.js Jetty8 Chrome GlassFis Opera h3. GlassFis IE h 312
Atmosphere - HTML5 Server Side Events Safari Tomcat 7 Jetty7 Atmosphere API Firefox atmosphere.js Servlet Chrome 3 WebLogi Opera c GlassFis IE h 312
Atmosphere Long-Polling/HTTP Streaming Safari JBoss Jetty7 Atmosphere API Firefox atmosphere.js Servlet Chrome 3 WebLogi Opera c. GlassFis IE h
Atmosphere Safari JBoss Jetty7 Atmosphere API Firefox atmosphere.js Same Chrome API, transport Servlet 3 independent!! WebLogi Opera c. GlassFis IE h
Socket.IO, GWT, Wicket, JSF, etc. Safari JBoss Jetty7 Atmosphere API Firefox Socket.IO Servlet Chrome 3 WebLogi Opera c. GlassFis IE h
PORTABLE!!!!! Safari JBoss Jetty7 Atmosphere API Firefox Socket.IO PORTABLE Servlet Chrome 3 WebLogi Opera c. GlassFis IE h
Big Big Big Mistake • Frameworkthat support ONLY WebSockets Going into Production? IMPOSSIBLE
Atmosphere
Definition • Suspend: open a channel • Resume: close a channel • Broadcast: push message to one or more channel
Components Atmosphere.js Interceptor(s) Handler(s)
Components Atmosphere.js Javascript Interceptor(s) client Handler(s)
Components Atmosphere.js Interceptor(s) Intercepts/ Filters Handler(s)
Components Atmosphere.js Application Interceptor(s) s Logic Handler(s)
Components Atmosphere.js Your Servlet Interceptor(s) ServletHandler
Components Your Servlet Atmosphere.js Based Framework Interceptor(s) ServletHandler
Components Atmosphere.js ws Your Servlet Interceptor(s) ServletHandler
Components Atmosphere.js ws Your Servlet ss e Interceptor(s) ServletHandler
Components Atmosphere.js ws Your Servlet ss http e Interceptor(s) ServletHandler
Request Browse r Browse Server r Browse r
Request Browse r Browse Server r Browse r
Suspend Browse r Browse Server r Browse r
Suspend Browse r S Browse Server r Browse r
Suspend Browse r S Browse Server r Browse r
Suspend Browse r S Browse Server r Browse r
Broadcast Browse r B S Browse Server r Browse r
Broadcast Browse r B S Browse Server r Browse r
Resume Browse r B Browse Server r R Browse r
Resume Browse r B Browse Server S r Browse r
Broadcaster • Default: in-memory • Cloud • RedisBroadcaster • JMSBroadcaster • XMPPBroadcaster • HazelcastBroadcaster • JGroupsBroascaster • Multi-Threads, Async I/O par default
Broadcaster Cloud Browse r S Server Browse r Browse S Server r
Broadcaster Cloud Browse r S Server Browse r Browse S Server r
Broadcaster Cloud Browse B r S Server Browse r Browse S Server r
Broadcaster Cloud Browse B r Server Browse r Browse r Server
Broadcaster Cloud Browse r Server Browse r B Browse r Server
Broadcaster Cloud Browse r Server Browse r Browse r Server
Atmosphere API • WebSocketHandler • Only WebSocket (WARNING)! • AtmosphereHandler • All transport • Jersey Resource • All transport • Meteor • All transport
WebSocket Sub Protocol • WebSocketProtocol Define your own websocket protocol • SimpleHttpProtocol WebSocket’s message mapped to HTTP POST, avec read/write asynchrone. • SwaggerSocket:REST over WebSockets -> Powerful Protocol
Let’s have some fun
Single Client to Rule Them All https://github.com/Atmosphere/atmos phere/blob/master/samples/chat/src/m ain/webapp/jquery/application.js#L1
WebSocket https://github.com/Atmosphere/atmos phere/blob/master/samples/websocke t- chat/src/main/java/org/atmosphere/sa mples/chat/WebSocketChat.java#L33
WebSocket, SSE, long-polling https://github.com/Atmosphere/atmos phere/blob/master/samples/chat/src/m ain/java/org/atmosphere/samples/chat /ChatAtmosphereHandler.java#L33
Socket IO https://github.com/Atmosphere/atmos phere/blob/master/samples/socketio- chat/src/main/java/org/atmosphere/sa mples/chat/SocketIOChatAtmosphere Handler.java#L34
Jersey https://github.com/Atmosphere/atmos phere/blob/master/samples/sse-rest- chat/src/main/java/org/atmosphere/sa mples/chat/jersey/ResourceChat.java #L32
JAXRS 2 https://github.com/Atmosphere/atmos phere/blob/master/samples/jaxrs2- chat/src/main/java/org/atmosphere/sa mples/chat/jaxrs2/Jaxrs2Chat.java#L3 4
SwaggerSocket • REST over WebSocket • JSON Based • Simple • Works with HTTP • Multi-Request/Response
Conclusion Join the Revolution It’s open source, it’s free to jumps in!!
twitter.com/jfarcand twitter.com/atmo_framework twitter.com/swaggersocket http://github.com/Atmosphere/atmosphere http://github.com/wordnik/swaggersocket

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Writing Portable WebSockets in Java