Interceptors

BoxLang is an event-driven language and you can not only listen, but register and announce events.

BoxLang is an event-driven language and it emits events throughout many different life-cycles. The entire framework for events is also extensible and can be used not only by Module developers but by anybody using the language in either BoxLang or Java.

If you are familiar with the intercepting filter pattern, or observer/observable pattern, then that's what BoxLang follows.

The way that interceptors are used is usually referred to as event-driven programming, which can be very familiar if you are already doing any Nodejs or observer/observable coding. You can listen and execute intercepting points anywhere you like in your application, you can even produce content whenever you announce these events.

Resources

• http://en.wikipedia.org/wiki/Observer_pattern
• http://sourcemaking.com/design_patterns/observer
• http://java.sun.com/blueprints/corej2eepatterns/Patterns/InterceptingFilter.html

For what can I use them

Below are just a few applications of BoxLang Interceptors:

• Security

• Event based Security

• Method Tracing

• AOP Interceptions

• Publisher/Consumer operations

• Implicit chain of events

• Content Appending or Pre-Pending

• View Manipulations

• Custom SES support

• Cache advices on insert and remove

• Much much more...