Intercepting Filter

Presentation-tier request handling mechanism receives different type of requests. They require various type of processing such as authentication checking, validation checking, modifying, auditing. Therefore, preprocessing and post processing  of a client request is required. In the normal scenario, we can do this by conditional checks and with a invaild check, abort the request. But this is not a good solution because, we have to change the code according to the type of request. Therefore, the best solution is to add and remove components, these specific components complete specific filtering actions.
    Therefore, when a client send a request, FilterManager manages the needed filters according to the order. It is the FilterChain with appropriate filters. It is an ordered collection of independent filters. The Filter chain coordinates their processing that are mapped to a target. The target is the resource that client requests.