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callback and inline methods

shanthisri mocherla
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Joined: Sep 05, 2005
Posts: 119
can anyone tell me what is meant by callback methods and inline methods?
i found that doFilter() is both a callback and inline method.
and destroy() is always a callback method.

what does it mean??
Layne Lund
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Joined: Dec 06, 2001
Posts: 3061
What does this do with SCWCD? And which classes do these methods come from?

I don't think I've ever heard of inline methods in Java. In C++, these are methods that are copied verbatim by the compiler where they are called instead of generated machine code for a function call. I don't think Java has any similar concept.

As for callback methods, these are methods that are typically called by some code that you didn't write. For example, in GUI programming with Swing, it is common to create an event listener such as an ActionListener. In this interface, actionPerformed() is considered a callback function because it is usually called by code in the Java API that deals with the event queue.


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shanthisri mocherla
Ranch Hand

Joined: Sep 05, 2005
Posts: 119
Hi Layne

i found them in the Filters chapter (coffee cram questions at the end of the chapter)in HeadFirstServlets and JSP book.

Marc Peabody
pie sneak

Joined: Feb 05, 2003
Posts: 4727

"container callback" simply means that the container invokes the method. (The term is used a lot in HFEJB, by the way!)

"inline method" here means you call it.

You and the container both call doFilter().
Only the container should call destroy().

Filters also have another container callback method: init(FilterConfig)

A good workman is known by his tools.
I agree. Here's the link:
subject: callback and inline methods
jQuery in Action, 3rd edition