[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [xmlblaster-devel] About persistent and history
peng at qcet.cn wrote:
> I try to create a persistent topic(with long life) so every user
>first login and receive the Message once(just once);
>and if the user second login again,the xmlblaster does not post the Message to this user again.
> How can I write the key and Qos?
Please look into:
You should have a persistent session for each user and the
user should initially login and subscribe to the topic.
Like this the messages are collected for all clients even if
they are offline.
> And I have Question about history,I create a persistent topic(with long life) ,
>I pub a message to this topic,after a while,I pub a other message to this topic again,
>then I use get(xa, "<key queryType='XPATH'>//key</key>" , "<qos/>", &xmlBlasterException)
> method to get the messages, I get the last message only,why I can not get the message I first post?
and search for history.
The history depth is 10, you can adjust it on first publish, see
"<queue relating='history' type='CACHE' maxEntries='1000' ...
PS: Have a look into xmlBlaster/demo/javaclients/HelloWorldSubscribe.java
or xmlBlaster/demo/c++/SubscribeDemo.cpp for usage examples.
> Thanks very much!