IRAPI run-time architecture

The following describes the basic architecture of the IRAPI:

• The run-time architecture is built in layers to support a more powerful platform for developing applications. From the IRAPI point of view, many elements of the software architecture are sophisticated applications. For example, the TSM and AD processes are standard IRAPI applications. This means they can co-reside (or be replaced completely) by other IRAPI applications.

TSM is an example of a horizontal-application: it is an application that runs other applications. The applications run by TSM support a particular problem domain. Application developers can create alternative horizontal applications to support solutions for different problem domains.

In contrast, vertical applications directly solve particular problems. These applications can coexist and work together with other horizontal and vertical applications. For example, an application developer could build a vertical application to provide voice mail to employees or banking services to customers.

• Since the IRAPI is accessible from C, the full capabilities for developing C applications are available to the application designer. The IRAPI is designed to be a vehicle to effectively develop co-resident applications.
• The IRAPI library is packaged as a shared object file. This packaging allows upgrades to the library without always forcing the applications to re-compile. If applications are required to be re-compiled, then application developers will be notified in release notes.
• In the IRAPI, application control and resource management is distributed over many processes in the system; the IRAPI coordinates all the applications.

Advanced speech technology packages describe themselves to the system, and that description drives the operation of the system. The maintenance system exploits the capabilities of the logger/alerter to drive automated maintenance of the platform. This makes system maintenance much more automatic and comprehensible.

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