z/TPF Java stateful Hello World driver

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The z/TPF Java™ stateful Hello World driver demonstrates how to utilize stateful services in a Java application. To use stateful service requests, you must set the providerType element to StatefulProgram in the service descriptor. Two examples are included in this package:

1. An application that makes one or more requests to update a counter.

   • Make a stateful request from a Java application (HelloWorldSF.java) to a stateful z/TPF application service provider - QRSF.CPP

   • QRSF.CPP increments a global variable that holds the counter value and returns the value to the Java application (HelloWorldSF.java) by calling the tpf_srvcSendResponse()  API.
     
     Note:  The Java application (HelloWorldSF.java) makes n requests in a single thread based on the returned counter value.

2. A single thread to intersperse the following items:

   • A stateful service request to open, read from, and hold a z/TPFDF subfile. The service returns the open z/TPFDF subfile to the Java client.

   • A stateful service request for z/TPFDF to add or replace the sample reservation and to unhold and close the z/TPFDF subfile.