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> how to implement persistent subscriber in xmlblaster. > > The enviroment is c++ , xmlblaster 848 version. > > for example, > I run the xmlblaster server. a publisher , a subscriber; > publisher publish 100 message, > subscriber receive 10 message , then shutdown the subsciber, > I want restart the subscriber, and the subscriber receive the remaining 90 message. Here is an example in Java:
---------------------------------------- java org.xmlBlaster.Main
java javaclients.HelloWorldPublish -numPublish 100
(hit a key to publish messages)
java javaclients.HelloWorldSubscribe
-session.name joe/2
-dispatch/callback/retries -1
-multiSubscribe false
-dispatch/callback/pingInterval 2000
----------------------------------------Now you can hit a key to subcribe, kill the subcriber publish some more messages, restart the subscriber and the messages arrive.
1. -session.name joe/2 assures that you reconnect to the same session id '2'
2. -dispatch/callback/retries -1 assures that xmlBlaster does not destroy the joe/2 session when the callback of the subscriber disappears
3. -dispatch/callback/pingInterval 2000 is just that xmlBlaster server pings the callback server every 2 seconds instead of every minute (this is optional)
4. -multiSubscribe false when the subscriber restarts it does the same subscribe again and you would receive the messages twice. Setting this to 'false' will ignore duplicate identical subscribes (An alternative solution: We could change the code of HelloWorldSubscribe to check if it has reconnected to the previous session and in this case not do a subscribe anymore).
I have not tried this with C++ but it should work as well. Note that the C++ client library does resubscribe automatically on reconnect if necessary (is this true Michele??)
regards
Marcel
-- http://www.xmlBlaster.org
