callback and inline methods

[shanthisri mocherla]

Hi,
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??
shanthisri

[Layne Lund]

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.

Layne

[shanthisri mocherla]

Hi Layne

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

Thanks
shanthi

[Marc Peabody]

"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)