er.ajax
Class AjaxPushRequestHandler

java.lang.Object
  com.webobjects.appserver.WORequestHandler
      er.ajax.AjaxPushRequestHandler

public class AjaxPushRequestHandler
extends WORequestHandler

Request handler that offers push-style notifications.
Gets registered under "/push/" on framework load.
You should open an Ajax.Request, implement onInteractive: and the do something useful when you get new data. Changes should be pushed with push(sessionID, someString);

TODO:

currently the request stays open even when the client closed it (which is bad)

implement a boundary scheme to tell when a "message" is complete. This means we need a special Ajax.Request that does it.

implement various client-side stuff to be actually useful (chats, EO notifications).

ask Frank about his EO layer

use the request handler path as a "topic", so we can have more than one on a page.

Author:

ak

Field Summary

static String	AjaxCometRequestHandlerKey
protected static Logger	log

Fields inherited from class com.webobjects.appserver.WORequestHandler

DidHandleRequestNotification

Constructor Summary

AjaxPushRequestHandler()

Method Summary

WOResponse	handleRequest(WORequest request) Get/Create the current request for the session and return it.
static boolean	isResponseOpen(String sessionID, String name) Returns whether or not there is a response open for the given session id and name.
static void	push(String sessionID, String name, NSData message) Push a data message to the client.
static void	push(String sessionID, String name, String message) Push a string message to the client.
void	sessionDidTimeOut(NSNotification n) Remove stale responses when a session times out.
static void	stop(String sessionID, String name) Push a string message to the client.

Methods inherited from class com.webobjects.appserver.WORequestHandler

toString

Methods inherited from class java.lang.Object

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

Field Detail

AjaxCometRequestHandlerKey

public static final String AjaxCometRequestHandlerKey

See Also:

Constant Field Values

log

protected static Logger log

Constructor Detail

AjaxPushRequestHandler

public AjaxPushRequestHandler()

Method Detail

sessionDidTimeOut

public void sessionDidTimeOut(NSNotification n)

Remove stale responses when a session times out.

Parameters:

n - the session timeout notification

handleRequest

public WOResponse handleRequest(WORequest request)

Get/Create the current request for the session and return it.

Specified by:

handleRequest in class WORequestHandler

Parameters:

request - the request

isResponseOpen

public static boolean isResponseOpen(String sessionID,
                                     String name)

Returns whether or not there is a response open for the given session id and name.

Parameters:

sessionID - the session id of the push response

name - the name of the push response

Returns:

whether or not there is still a response open

stop

public static void stop(String sessionID,
                        String name)

Push a string message to the client. At the moment, there is no boundary handling, so be aware that you could get only half of a message.

Parameters:

sessionID - the session id of the push response

name - the name of the push response

push

public static void push(String sessionID,
                        String name,
                        String message)

Push a string message to the client. At the moment, there is no boundary handling, so be aware that you could get only half of a message.

Parameters:

sessionID - the session id of the push response

name - the name of the push response

message - the message to push

push

public static void push(String sessionID,
                        String name,
                        NSData message)

Push a data message to the client. At the moment, there is no boundary handling, so be aware that you could get only half of a message.

Parameters:

sessionID - the session id of the push response

name - the name of the push response

message - the message to push