Siemens V 4.0 manual General reference, Global interface, Global reference, Global transaction

Glossary

general reference

A general reference GREF(P) is a →global reference. The →smart pointer GREF(P) can refer to a local →persistent object or a stub object. A method call is handled accor- dingly using either a local or a →remote call.

global interface

The global interface of a class is the subset of the methods of the class which can also be called →remotely.

global reference

A global reference is used in GINA to address an object, which is (possibly) remote. There are different types of global references – pure →data references or →smart pointers in the form of →remote references or →general references. A global reference can be reduced to a local Persistency Service reference on the target application.

global transaction

In a →distributed transaction, a →transaction monitor groups together a number of →local transactions to form a global transaction.

When the end of the global transaction is reached, either all the local transactions are rolled back, or all the local transactions are terminated with a commit. The local trans- actions do not therefore behave like nested transactions.

inheritance

In object-oriented languages, a derived class inherits the interface of its base classes. In C++, the implementation of the base classes is also inherited together with the interface.

instance method

An instance method is a method which is used on a certain instance, i.e. an object, of a class. These are also called object methods or simply methods.

instantiation

In object-oriented database systems, an object is generally accessed directly using a reference. In Persistency Service, the persistent object is instantiated when it is first accessed, i.e. it is loaded into the process address space.

job submitter

see →client

206 GINA V4.0 System Administrator Guide – September 2000