Interceptors in Stubbles allow to intercept (yeah...) the request before the actual processor is called (PreInterceptor) and after the processor has done it's work to create the response (PostInterceptor) but before this response is sent back to the user agent. This is quite powerful and allows manipulating the request before any real work is done as well as manipulating the response before it is sent. Usage examples range from setting up the correct variant for the website depending on request parameters or cookies up to turning the response from a default 200 OK into a 304 Not Modified status.
Until now creation of interceptors and their dependencies was quite limited as they were configured via XJConf and not with Stubbles' own IoC framework which means there was no proper way to get an interceptors' dependencies injected. It was only possible by using the stubBinderRegistry as a kind of service locator, which means to actively look for things instead of just ask for them as explicit dependencies via constructor and/or setter method parameters. Fortunately, this is going to change with Stubbles 1.1.0.
Stubbles 1.1.0 introduces a new interceptor initializer based on a property file. The property file contains a list of both pre- and postinterceptor class names, and this new interceptor initializer will iterate through this list and create every interceptor instance using Stubbles IoC, allowing you to make full usage of Stubbles IoC features in your interceptor class. No more looking for things which makes your interceptors hard to test, but just explicitly asking for dependencies.
What about the old way? Stubbles 1.1.x will still support the old way using xml configuration files and XJConf without Stubbles IoC, but you have to activate it explicitly when upgrading. To do this, put a call to stubWebsiteBindingModule::usingInterceporInitializer(
'net::stubbles::ipo::interceptors::stubInterceptorXJConfInitializer') in your index.php file (please note that this is not a static method call, but a method call on an instance of stubWebsiteBindingModule). However, we encourage to upgrade to the new behaviour, as it is more powerful and much cleaner. The old way becomes deprecated with 1.1.0 and will be removed with 1.2.0 or 2.0.0 (whichever comes first, we don't know yet).