You can call an EGL-generated Java program in an EGL service or EGL Web service, but only if the program is non-interactive. The program in this case may be deployed inside or outside of J2EE.
In addition, EGL provides a way to define a Web application that has the following characteristics:
For details on this specialized support for Web applications, see PageHandler part.
You also can update a program of type VGWebTransaction, although the best practice is to use PageHandler parts for developing Web applications. EGL includes the program type to support migration of a VisualAge® Generator program type that allowed developers to structure a Web application as if the code were running in a non-Web environment. The program of type VGWebTransaction retrieves data, displays data, accepts user input, and post-processes data, whereas most applications built with PageHandler parts forward control from one Web page to the next.
A program of type VGWebTransaction is a main program (not called) and runs outside of J2EE.
Finally, you can use EGL to generate a Java wrapper, as described in the next section.
The next table shows the valid calls to or from the EGL-generated code.
Calling object | Called object |
---|---|
An EGL-generated Java wrapper in a Java class that is outside of J2EE | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated EJB session bean | |
An IMS/VS program (generated by EGL or not) | |
A CICS® program (generated by EGL or not) | |
An EGL-generated Java wrapper in a J2EE application client | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated EJB session bean | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) | |
An EGL-generated Java wrapper in a J2EE Web application | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated Java program in the same J2EE Web application | |
An EGL-generated EJB session bean | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) | |
An EGL-generated Java program that is outside of J2EE | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated EJB session bean | |
A non-EGL-generated program that was written in C or C++ | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) | |
An EGL-generated Java program that is in a J2EE application client | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated EJB session bean | |
A non-generated program that was written in C or C++ | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) | |
An EGL-generated Java program in a J2EE Web application | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated Java program in the same J2EE Web application | |
An EGL-generated EJB session bean | |
A non-generated program written in C or C++ | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) | |
An EGL-generated EJB session bean | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program in a J2EE application client | |
An EGL-generated EJB session bean | |
A non-generated program written in C or C++ | |
An IMS/VS program (generated by EGL or not) | |
A CICS program (generated by EGL or not) |
The next table shows the valid transfers to or from EGL-generated code.
Transferring object | Receiving object |
---|---|
An EGL-generated Java program that is outside of J2EE | An EGL-generated Java program (non-J2EE) |
An EGL-generated Java program that is in a J2EE application client | An EGL-generated Java program in the same J2EE application client |
An EGL-generated Java program in a J2EE Web application | An EGL-generated Java program in the same J2EE Web application |