E.Interception pattern

Summary

1. 1. Interception is a design pattern that is designed for cross-cutting concerns, issues that cut across the entire software.

   2. This is mainly used to put some special handling before or after method calls to handle the cross-cutting concerns, get the code out of the methods, and enhance its maintainability.

   3. Technically interceptors are proxy and generally is used in references of IOC Containers like Unity and core part of AOP.

Types of interceptors

The two styles of interception are instance interception and type interception.

1. 2. 1. Instance interceptors use a separate proxy object between your code and your target object. Using interception, you make a call on the proxy object instead of directly calling the target object. The proxy invokes the various call handlers, and then it forwards the call to the target object.

      2. Type interceptors create a new type that inherits from the target type. This new type is then instantiated instead of the original type you requested. It overrides all the virtual methods on your target type. There is only one object instead of two as with instance interceptors.

Implementation techniques

Uses/Example

Specific Considerations

Related Pattern