Objects and state, The application object and application state – Apple WebObjects 3.5 User Manual
Page 113
Objects and State
113
Characteristically, WebObjects takes an object-oriented approach to
fulfilling any of these state-storage requirements.
Objects and State
Three classes manage state in an application—WOApplication,
WOSession, and WOComponent. (In Java, these classes are called
WebApplication, WebSession, and Component.) An application object
handles state associated with the application as a whole, session objects
handle state associated with a particular user session within the application,
and component objects handle state associated with a particular page or
component within a session.
The Application Object and Application State
The application object is the logical place to store data that needs to be
shared by all components in all sessions of an application. Application state
is typically stored in the application object’s instance variables. For
example, the application object in the DodgeLite example application (in
where
is your web server’s document
root), keeps information about the cars available and the possible prices: