Tomcat and Bayeux for HTTP streaming

[Markus Innerebner]

Hi all,

I would like to use TOMCAT together with Bayeux to develop a streaming 
application.


My question:
1) is it possible with Bayeux to send in one and the same HTTP response 
several messages at different times back to the client?
2) where can I find additional informations about Tomcat and Bayeux in 
context with streaming?


many thanks

Markus

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Comet question with Tomcat

[Markus Innerebner]

Hi all,

I am using Tomcat6  together with Comet. I implemented as described in 
the article Advanced IO and Tomcat the servlet, message sender ...


The main reason for using comet is that I would like to implement a kind 
of streaming, what means:


I am launching from the client with a AJAX request that is processed by 
the servlet: on the server the EventType.BEGIN is passed to the event 
method and than I start to run an specific algorithm. In this algorithm, 
whenever a specific event occurs, the message sender is notified and 
writes into the response write a content. This stream is send to the 
client, parsed and displayed in the page.


Unfortunately on the client I only see the content send from message 
sender after the first event. All others are not send to the client even 
if the message sender writes it out int the response which is still open.


On client side the javascript function (see below go()) is invoked only 
once. Any idea what I am doing wrong?


function go(){
var url = http://myHost:8080/myServlet;;
var request = new XMLHttpRequest();
request.open(POST, url, true);
request.setRequestHeader(Content-Type, 
application/x-javascript;);

request.onreadystatechange = function(){
if (request.readyState == 4) {
if (request.status == 200) {
	if (request.responseText) { 
   document.getElementById(msgContainer).innerHTML = 
request.responseText;

}
}
}
};
request.send(null);
}


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Comet and mod_jk

[Markus Innerebner]

Hi all,

I see that when using Mod JK (ver. 1.2.26-2) together with Comet I
always get the message: 405 HTTP method POST is not supported by this
URL. (My servlet engine is tomcat 6.0.14)

I googled and found out that mod_jk has its own connector which does not
support the comet event.

Is there a way to solve this problem ?
E.g. specify in mod_jk to use the connector
org.apache.coyote.http11.Http11NioProtocol

If not, what else can you suggest me?

For me it is not important to use mod_jk. The important thing is that
the servlet invoked in my webpage (specified without port) is redirected
tomcat.

Many thanks

Markus

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Re: Comet and mod_jk

[Markus Innerebner]

Filip Hanik - Dev Lists wrote:

There are only two connectors in Apache Tomcat that support Comet,
APR HTTP and NIO HTTP connectors.
This means, if you want Apache in front of it, you would use mod_proxy_http

Many thanks for your suggestion.

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