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Diff b/w RPC and DataServices when calling Java

Avatar

Level 1
Hi All,



I have read a little about Flex and Java , and need further
reading and practice to grab all the stuff need to develop a simple
app.



I have a doubt regarding the ways we can interact with Java
Objects.



The Remote Procedure Call is made to a java object after we
configure the java class in remoting-config.xml



The same with DataManagment, we configure the Java Object in
data-management-config.xml



Whats the main diff between these procedures ?



How can i judge myself to use either of these to invoke Java
Object .



I am planning to do a sample app..so which way to go....



I have gone through the 30min Flex java fds-tomcat realease ,
but couldnt find that much useful to know the basic things like how
to configure and what to do for developing a simple app like create
an employee, edit his details and delete the employee..



Can anyone passover a sample app that was developed by u
while u were learning Flex with Java....?



Kindly suggest regarding this aspect...



Madan N
2 Replies

Avatar

Level 2
Hi! I will try my best to answer you correctly.



RemoteObject permit you to instanciate object and call method
to perform action on the database. From here it's very easy to
understand the mechanism.



DataService permit you to set up a proxy, with Java or
ColdFusion, to manage the transaction with the Database and push
all changes to database on each instance of the application running
in real time.



You follow me?



By example:

In a CRM application if your manager update a client profile
behind you're in the account, you will not have to refresh the page
to see the data updated. The page will get updated by the
DataService proxy.



That's very usefull when developping application that scope
to a lot people at the same time.

That reduce traffic on the network for AJAX base application,
because there's no page of the application who perform timer base
request to query for new data, they still wait for the proxy to
update them.

Everybody get new data at the same if they're on the DB row.

And finally, it's very easy the devellop.



I wish that's help you and sorry for my english.

Avatar

Level 4
RemoteObject simply enables your Flex client application to
call methods on your Java class on the server. It's very simple to
use and configure and there's no magic behind it. You make the call
from Flex, it goes to the server, LCDS makes the call to the Java
class, gets the result and returns it back to your Flex client.
That's it.



DataService on the other is much more sophisticated. It lets
you expose your DB to Flex clients through Java objects and
Assemblers (that you have to write yourself) on the server and
Actionscript objects on the client. It also maintains the list of
Flex clients looking at the data, keeps those clients in sync, make
sure an update from one client goes to the other and so on. It
basically enables you to write sophisticated multi client
applications.