CORBA 2.6.1 Glossary

A development tool for debugging a NonStop CORBA application. While the esadmin tool can
also be used to perform Event Service administrative and management tasks, the Console is the
preferred tool for management in production environments.
event
(1) The link between the behavior that a component wants to react to and the code that tells the
application how to respond. Java differentiates between the source of an event (the provider) and
the handler for an event (what to do).
(2) In NonStop CORBA, an asynchronous message sent by one object to another.
(3) In Distributed System Management (DSM), an error or other occurrence of significance to the
operator, described in a message from a software subsystem to the Event Management Service
(EMS).
event handler
An object defined by the NonStop CORBA event framework to support asynchronous
communication between a NonStop CORBA application process and other processes, such as
legacy clients or servers. NonStop CORBA provides various types of event-handler objects for use
in legacy server wrappers.
event handler user
An object that makes requests to an event handler on behalf of an application process.
Event Management Service (EMS)
A set of processes and interfaces through which NonStop products report significant events to a
common location for subsequent distribution to operators and management applications. EMS
supports filters through which the user can request messages from specific products or messages
having specific content or characteristics.
Event Service
A standard application service (one of the OMG Common Object Services) for asynchronous
communication among objects. See also esadmin tool.
exception
An event during program execution that prevents the program from continuing normally;
generally, an error. Java supports the try, catch, and throw keywords for exceptions.
exception handler
A block of code that reacts to a specific type of exception. If the exception is for an error that the
program can recover from, the program can resume running after the exception handler has
executed.
externalization service
A standard application service (one of the OMG Common Object Services) that supports the
movement of object-state information from one process or medium to another using the abstract
concept of a "stream." The sender performs any transformations required to write the data to the