2.3.4 TP Framework

The TP Framework provides a programming model that achieves high levels of performance while shielding the application programmer from the complexities of the CORBA interfaces. The TP Framework supports the rapid construction of CORBA applications, which makes it easier for application programmers to adhere to design patterns associated with successful TP applications.

The TP Framework interacts with the Portable Object Adapter (POA) and the CORBA application, thus eliminating the need for direct POA calls in an application. In addition, the TP Framework integrates transactions and state management into the Oracle Tuxedo CORBA application.

The application programmer uses an application programming interface (API) that automates many of the functions required in a standard CORBA application. The application programmer is responsible only for writing the business logic of the CORBA application and overriding default actions provided by the TP Framework.

The TP Framework API provides routines that perform the following functions required by a CORBA application:

• Initializing the CORBA server application and executing startup and shutdown routines
• Creating object references
• Registering and unregistering object factories
• Managing objects and object state
• Tying the CORBA server application to Oracle Tuxedo CORBA system resources
• Getting and initializing the ORB
• Performing object housekeeping

The TP Framework ensures that the execution of a client request takes place in a coordinated, predictable manner. The TP Framework calls the objects and services available in the Oracle Tuxedo application at the appropriate time, in the correct sequence. In addition, the TP Framework maximizes the reuse of system resources by objects. The following figure illustrates the TP Framework.

Figure 2-4 The TP Framework

The TP Framework is not a single object, but is rather a collection of objects that work together to manage the CORBA objects that contain and implement the data and business logic in your CORBA application.

One of the TP Framework objects is the Server object. The Server object is a user-written programming entity that implements operations that perform tasks such as initializing and releasing the server application. For server applications the TP Framework instantiates the CORBA objects needed to satisfy a client request.

If a client request arrives requiring an object that is not currently active and in memory in the server application, the TP Framework coordinates all the operations that are required to instantiate the object. This includes coordinating with the ORB and the POA to get the client request to the appropriate object implementation code.