June 2002
Intermediate to advanced
400 pages
7h 48m
English
Content preview from WebObjects® Developer's Guide
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Overview of Enterprise Objects
It is time to take a look at the theory behind the magic of Enterprise Objects. In particular, what exactly Enterprise Objects do.
Introduction to Object Persistence
We have seen what it is for an object to have state and we have often referred to it informally as its memory.
However, the state of say a session object, would last the duration of a session. The state of an application would last until it is quit, so that the next time the application is started the state of the application object returns to its initial settings.
NOTE
Typically the state of all objects in an application is lost when the application process has terminated.
What it means for an object to be persistent is for its state to transcend its ...