The Javadoc should help a bit, also just look at the stock implementations:
http://flume.apache.org/releases/content/1.2.0/apidocs/org/apache/flume/interceptor/Interceptor.html

The user guide tells you how to put them in your config file:
http://flume.apache.org/FlumeUserGuide.html#flume-interceptors

Regards,
Mike


On Fri, Aug 10, 2012 at 5:19 PM, Patrick Wendell <[email protected]> wrote:

> Hey Mark,
>
> Writing a custom interceptor means writing a Java class that
> implements the org.apache.flume.interceptor.Interceptor interface.
> Then you include your class in the classpath when launching a flume
> agent.
>
> If you look at that interface, you'll see that an interceptor can
> modify all of the details of event, including headers and body.
>
> - Patrick
>
> On Thu, Aug 9, 2012 at 3:21 AM, Stern, Mark <[email protected]> wrote:
> > I want to write a custom interceptor to modify the text of an event (not
> > just headers). Can this be done? Is there any documentation on how to go
> > about doing it?
> >
> > Thanks,
> >
> > Mark Stern
>

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