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Now that you've seen the relationships between client and server in CORBA, you're ready to step through the process of designing and developing a distributed object application with Java IDL.
You define the interface for the remote object using the OMG's interface definition langauge. You use IDL instead of the Java language because theidltojava
compiler automatically maps from IDL, generating all Java language stub and skeleton source files, along with the infrastructure code for connecting to the ORB. Also, by using IDL, you make it possible for developers to implement clients and servers in any other CORBA-compliant language.Note that if you're implementing a client for an existing CORBA service, or a server for an existing client, you would get the IDL interfaces from the implementer--such as a service provider or vendor. You would then run the
idltojava
compiler over those interfaces and follow the steps for creating the client or server described in this trail.
When you run the idltojava
compiler over your interface definition file, it generates the Java
version of the interface, as well as the class code files for the
stubs and skeletons that enable your applications to hook into the
ORB.
Once you run the idltojava
compiler, you can use the skeletons it generates to put together your
server application. In addition to implementing the methods of the
remote interface, your server code includes a mechanism to start the
ORB and wait for invocation from a remote client.
Similarly, you use the stubs generated by the
idltojava
compiler as the basis of your client application. The client code
builds on the stubs to start its ORB, look up the server using the name
service provided with Java IDL, obtain a reference for the remote
object, and call its method.
Once you implement a server and a client, you can start the name service, then start the server, then run the client.You'll see the details of each of these steps in The Hello Client-Server Example, a simple client-server model based on the classic "Hello World" application.
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