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WebSocket

( )
/ MA / TI
@ohmyzany, http://zany.kr

? ???? ?????
TCP Socket ? ???? ??? ??(two-way communication)?
?? ?? ??.

?? ??(PUSH Technology)? ??.

?? W3C ? ?? ??? ?? ?.
W3C Editor's Draft - 27 July, 2010

W3C Working Draft - 22 December, 2009

?? ??? Chrome ?? Safari ? ? ??? ??.

WebSocket - http://zany.kr (@ohmyzany) 2

? ??? ? ?????
? ??? long-polling (Comet; Reverse AJAX) ? ??.
long-polling (Comet; Reverse AJAX) ??

??????? ?? ?? ?, Connection ? ??? ??

?? ???? ?? ??? ??? Connection ? ?? ???? Push ??
? ??.

?????? ??? ?? ?? ?? ??? ??? ??

??? ???? ??? Connection ? ??.


Ajax - Asynchronous JavaScript and XML


Long-polling (Comet; Reverse AJAX)


WebSocket W3C Editor's Draft
2010? 8? 10? ??, WebSocket Interface

[Constructor(inDOMStringurl,inoptionalDOMStringprotocols)] ? 10 August, 2010 Editor��s Draft
[Constructor(inDOMStringurl,inoptionalDOMString[]protocols)]
interfaceWebSocket{ ? ?? ? ??? Working Draft ?? ?? ??.
readonlyattributeDOMStringurl;
? Working Draft : 22 December, 2009
//readystate
constunsignedshortCONNECTING=0;
constunsignedshortOPEN=1;
constunsignedshortCLOSING=2;
constunsignedshortCLOSED=3;
readonlyattributeunsignedshortreadyState;
readonlyattributeunsignedlongbufferedAmount;

//networking
attributeFunctiononopen;
attributeFunctiononmessage;
attributeFunctiononerror;
attributeFunctiononclose;
readonlyattributeDOMStringprotocol;
booleansend(inDOMStringdata);
voidclose();
};
WebSocketimplementsEventTarget;


WebSocket Interface
Interface ??
???(Constructor)? 2?? ??? ??

??? URL

??? ???? (?????, ???? ??) - Optional

non-empty ASCII string.

only characters in the range U+0021 to U+007E


WebSocket Interface
Websocket ?? ?? - websocket() ???? ????...
URL ????? host, port, resource name, secure ? ??

???? ??, SYNTAX_ERR exception ? throw ?? ??.

????? 80 ?? ??, 443 ??? ?? ??? ??.

??? ?? ?? ?? SECURITY_ERR exception throw.

protocol ? ????? ?? ????, SYNTAX_ERR exception ?
throw ?? ??.

websocket ??? ?? (??? ???? readyState ???
CONNECTING ??? ????)

??? ??? ?? ?? (host, port, resource name, secure,
protocol)

WebSocket Interface
readyState Attribute
CONNECTING (0) : Connection ? ?? Established ?? ?? ??.

OPEN (1) : ? ??? Established ? ??, ?? ??.

CLOSING (2) : ??? ???? ?? ?.

CLOSED (3) : ??? ??? ???.


WebSocket Interface
send(DOMString data) method
???? ??.

readyState ? CONNECTING ? ??, INVALID_STATE_ERR exception.

data ??? ??? ?? ?? ??, SYNTAX_ERR exception.


WebSocket Interface
close() method
readySate ???? CLOSING, CLOSED ? ??, do nothing.

??? Established ? ?? ??, readyState ?? CLOSING ?? ??.

?? ?? ??? ?? ???? ?? ??, readyState ????
CLOSING ?? ??.

??? ??, readyState ???? CLOSING ?? ??.


? ?? ??? ??
phpwebsockets
http://code.google.com/p/phpwebsockets/

jWebSocket ( java)
http://jwebsocket.org/

web-socket-ruby (ruby)
http://github.com/gimite/web-socket-ruby

Socket-IO-node (node.js)
http://github.com/LearnBoost/Socket.IO-node


jWebSocket
jWebSocket ??
??? ???? ??? ??(bidirectional communication)? ?? ?
? ???.

HTML5 ??? ????, ?????? ?????? ?? ??.

Java/JavaScript ?? ??.

??? XHR(Xml Http Request)? Comet ???? ??.


jWebSocket
jWebSocket ??
jWebSocket Server (pure Java Based)

server-to-client (S2C) streaming solutions

server controlled (C2C) client-to-client-communication.

jWebSocket Client (pure JavaScript Based)

multiple subprotocols

an optional user, session and timeout-management.

No plug-ins required

jWebSocket FlashBridge

a Flash based WebSocket Wrapper (requires Flash plug-in)

jWebSocket
Infrastructure - Server


jWebSocket
Infrastructure - Client


jWebSocket
?? ????

Browser Version Comment

6.0.x
? Chrome includes native WebSockets since 4.0.249.
Chrome 5.0.x
4.0.249+ ? Tested and verified by jWebSocket team 2010-02-28.

? Safari 5.x includes native WebSockets
5.x
Safari - tested and verified by jWebSocket team 2010-06-08.
4.x
? Safari 4.x does not yet provide the WebSocket class.

4.0b1 ? Firefox 3.7a6 and 4.0b1 now include native WebSockets
Firefox 3.7a6 - tested and verified by jWebSocket team 2010-07-14
3.0+ ? including new Security features (Sec-WebSocket-Key header processing)

Opera with 9+
? Tested and verified by jWebSocket team 2010-03-28.
FlashBridge 10+


jWebSocket
?? ?? ??
?? ?? ????.

Windows, Linux, Unix ?? ??.

Prerequisites on the Server
Java Runtime Environment (JRE) 1.5

JAVA_HOME ?? ?? : Java Home Directory.

JWEBSOCKET_HOME ?? ?? : jWebSocket Home Directory.

Windows ????? java.exe ? PATH ? ???? ?? ?? ??.


jWebSocket
?? ?? ??
?? ?? ???? - jWebSocketServer-0.9.5.zip

??? ????? ?? ??

Symbolic Link - /usr/local/jWebSocketServer

JWEBSOCKET_HOME ?? ?? ?? - .bashrc or .bash_profile

[root@zanyui-Mac-ProjWebSocket]#cpjWebSocketServer-0.9.5.zip/usr/local
[root@zanyui-Mac-ProjWebSocket]#cd/usr/local
[root@zanyui-Mac-ProjWebSocket]#unzipjWebSocketServer-0.9.5.zip
[root@zanyui-Mac-ProjWebSocket]#ln-s/usr/local/jWebSocket-0.9.5/jWebSocketServer


jWebSocket
?? ??
?? 2?? ?? ? ?? ??.

apache ? ??? ???? ??? ??.

$ apachectl start

java-jar$JWEBSOCKET_HOME/libs/jWebSocketServer-0.9.5.jar
java-jar$JWEBSOCKET_HOME/libs/jWebSocketServer-0.9.5.jarlogtarget=consoleloglevel=info


jWebSocket
????? ??
????? ?? ?? ???? - jWebSocketClient-0.9.5.zip

??? ????? ?? ??? ?, apache ? ???? ?? ????
? ?????, ~/Sites/jWebSocketClient ? ?? ????? ?? ?
??? http://localhost/~user/jWebSocketClient ? ????.

Apache Web Server 2.2.14 ??, ?? ???? ???? ??
$vi/etc/apache2/httpd.conf
IfModulealias_module/IfModule??????????
#ZanyAdd
Alias/jWebSocket/Volumes/MacData/Projects/websocket/jWebSocket

Directory/Volumes/MacData/Projects/websocket/jWebSocket
OptionsIndexesFollowSymLinksMultiViewsExecCGI
AllowOverrideNone
Orderallow,deny
Allowfromall
/Directory


?? ? ?? ??
WebSocket Interface.

jWebSocket.


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