CORBA 2.3 Glossary (NonStop CORBA 2.3.7+)

A logical connection to the TCP/IP process.
stateful processing
A style of application logic in which all operations directed to the same object (for the duration of
a link acquired by the client) must be handled by the same servant. Operations directed to other
objects in the class can be handled by different servants in other processes. A stateful object can
maintain state information (data associated with a particular object instance) in memory between
operations, because all requests for that reference go to the same instance. With stateful objects, a
client's object must always reference the specific instance of that object. Stateful objects are
created by a POA whose lifespan policy is TRANSIENT, such as the root POA, or by explicitly
setting the NonStop CORBA proprietary state policy to STATEFUL. Stateful processing is the
default behavior for objects as specified by the root POA.
stateless processing
A style of application logic in which operations directed to the same object can result in requests to
different servants, which in turn can reside in different processes in a server pool. A stateless
object cannot maintain state information in memory between operations, because the state
information would be available to only one process. A client reference can address any of a set of
instances. Stateless objects are accessible only when hosted in a server pool. Stateless processing
is selected by using a lifespan policy of PERSISTENT (or by setting the NonStop CORBA
proprietary state policy to STATELESS) for the POA that creates the object reference, and by
enabling the GIOP over TS/MP protocol in the server.
Static Invocation Interface (SII)
A request style in which the client must know the object interface (the calling sequence for
requesting specific operations) at compile time. Contrast Dynamic Invocation Interface.
Structured Query Language (SQL)
A standard technology for defining and using relational databases. NonStop SQL/MP is an HP
implementation of this standard.
subclass
An object class that inherits characteristics from another object class.
subnet
A concept that applies to TCP/IP, which defines the relationship between a TCP/IP process, one or
more TLAM processes, and one or more Internet (IP) addresses.
Subsystem Control Facility (SCF)
The interactive utility for configuring, monitoring, and controlling networking resources on a
NonStop system.
Subsystem Programmatic Interface (SPI)
A set of conventions that provide a uniform way to automate the management of many products on
a NonStop system. In general, a management programming interface based on SPI makes available
the same set of services available to an operator through the corresponding interactive utility. For