[xmlblaster] Re: plugin help

[Marcel Ruff <mr at marcelruff.info>]

Zhou Dong wrote:

> Hi,
>
> 1. How can I write my own plugin to return content?
>
> Such as :
>
> I call con.get("<key oid='__cmd:?freeMem'/>", null); it returns the 
> value of FreeMemory.
>
> Now I want to call : con.get("<keyoid='__mycmd:?Hello'/>", null); it 
> returns “Hello OK”,
>
> How to write that plugin?
I probably don't understand the question.
Just publish a message which contains 'Hello OK' and retrieve it with 
the synchronous get() method.

> 2.How to know the users who are online?
There are 3 internal messages which handle users, the key oid (topic) is

__sys__Login
__sys__Logout
__sys__UserList

you can subscribe to those messages, the content contains the user name.
See 
xmlBlaster/testsuite/src/java/org/xmlBlaster/test/authentication/TestLoginLogoutEvent.java

> 3.How to know how much messages and bytes have been transferred 
> between 8:00 to 9:00?
There is currently no such support in xmlBlaster.
You can implement it with a client snooping messages (subscribe to them) 
and doing the statics itself
or write a publish plugin which does this, see:
http://www.xmlblaster.org/xmlBlaster/doc/requirements/mime.plugin.publishfilter.html

> 4.Can I use MySQL with xmlBlaster?
There is no port for this, but it shouldn't be too complicated (probably
only configurations to change) see:
http://www.xmlblaster.org/xmlBlaster/doc/requirements/queue.jdbc.html

> 5.How to transfer a file/message which should compress when send, and 
> decompress when receive?
This was planned since beginning but nobody has implemented it yet,
you have to do it your own with the java zip utility.

regards

Marcel

> Thanks
>
> ZhouDong
>
> 2003.3.6