Re: [xmlblaster] Newbie question: xlmblaster and php: how to get updates?

[Marcel Ruff <mr at marcelruff.info>]

Eduard Martinez wrote:
> Hello
>
> I'm trying to implement an application wich sends messages asynchrolously
> betwen a java application an several php clients. I took a look to the 
> php
> demo, but I can't figure how to suscribe on a topic and specify 
> something to
> get updates when there is a new message of the topic, like the java 
> client.
> Is it possible? How can I do it?
>
> Cheers,
>
>  Edu 
Salute Edu,

i don't think that Cyrilles XmlRpc demo supports callbacks.

So you need to make your own implementation,
here are three approaches you could try:

1. Extend Cyrilles XmlRpc example with a XmlRpc-callback server,
there are many such implementations, see
http://www.xmlrpc.com/directory/1568/implementations

2. Access our xmlBlaster C library from PHP.
 Like this you have tunneled callbacks, high performance, zlib compression
 See 
http://www.xmlblaster.org/xmlBlaster/doc/requirements/client.c.socket.html
 and see how our C# example is doing this:
   http://www.xmlblaster.org/xmlBlaster/doc/requirements/client.csharp.html

3. You can use Cyrilles XmlRpc PHP code and use blocking get() calls 
(with timeouts):
 You would subscribe with PHP but the clients callback queue has set 
dispatcherActive=false
 so the messages are collected on server side. Now you can use 
synchronous get()
 calls which block until messages are available
 (see 
xmlBlaster/src/java/org/xmlBlaster/client/XmlBlasterAccess.java:receive() 
as a
 code sample to use for PHP).
 This approach is very simple but you need to use a dedicated thread in 
PHP for the blocking get() call
  (see also 
http://www.xmlblaster.org/xmlBlaster/doc/requirements/engine.qos.queryspec.QueueQuery.html)

regards
Marcel