Requesting a message back from the server

A client application cannot pass a PowerBuilder object reference to EAServer. Therefore, you cannot use a PowerBuilder object reference to push messages from the server back to a PowerBuilder client. However, you can simulate this behavior by using a shared object on the client to communicate with EAServer. This technique can be thought of as client pull, because the shared object on the client pulls data back from the server.

To simulate server push, the client uses the SharedObjectRegister and SharedObjectGet functions to create a shared object. Once the object has been created, the main thread on the client makes an asynchronous call to a method on the shared object, passing it a callback object that should be notified when processing has finished on the server. The method on the shared object makes a synchronous call to the EAServer component method that performs processing. Since the shared object is running in a separate thread on the client, the main thread on the client can proceed with other work while the process is running on the server.