Hello,
I am a JMX newbie, i have successfully write some standard mbean follows
the example in the Jboss docs. I plan to do some serious component using
this model, therefore i post this message to verify with you gurus and
hope to get some comments and feedbacks.
My objective of using mbean is to create a caching layer at the server
side where some data retrieve through session bean will be cached at the
mbean. The client (web-client, java client) will access the mbean to
retrieve data, only if the data is not available in the cache it will
invoke the session bean(which will retrieve data from database). So
rougly the flow would be
client -> mbean -> session bean -> database.
What i currently did were;
1. Create a mbean that's serializable and bind the mbean to a jndi
server using the following code. The mbean have some static Map for
caching.
private void bind(Context ctx, String name, Object val)throws
NamingException{
Name n;
for (n = ctx.getNameParser("").parse(name); n.size() >
1; n = n.getSuffix(1)){
String ctxName = n.get(0);
try{
ctx = (Context) ctx.lookup(ctxName);
}catch (NameNotFoundException
namenotfoundexception){
ctx = ctx.createSubcontext(ctxName);
}
}
ctx.bind(n.get(0), val);
}
2. invoke the mbean through jboss RMIConnector, using the RMIAdapter
bind at the
Following jndi name "jmx/rmi/RMIAdaptor". Then I will invoke the mbean
using the
RemoteMBeanServer instance.
RMIAdaptor adaptor = (RMIAdaptor)context.lookup(jndiName);
RemoteMBeanServer server = new RMIConnectorImpl(adaptor);
My questions are:
1. Is it appropriate to implement my objective using mbean or there is
better altenatives?
2. I notice in the example there is NonSerializable binding. What is the
different in binding
A serializable or non serializable mbean? If I require to access the
mbean remotely which is more appropriate?
3. If I had a serializable mbean, does that meant each time I invoke the
mbean I will get a copy of the mbean or a 'proxy' of the mbean? From my
testing I found that whenver I invoke the mbean through the connector,
the changes is reflect at the server.
4. Does the mbean only instantiated once in the server JVM, meaning all
the client will access the same mbean instance? If no, can I create a
singleton mbean?
5. what's the different between RMIAdaptor and RMIConnector?
Thanks.
Any comments and suggestions are very much appreciated.
Regards,
Stephen
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