Design mode-Proxy mode

A middle layer is added between the upper end (where it is called directly, such as the UI layer, the Program.main method), and the classes that are actually used. Such as: Real estate agents, intermediary to find listings, contracts and many other matters.

Most common usage scenarios: WebService

Use:

1. Instantiation of the control object

2.

Benefits: Scalable

Example:

1. Proxy mode for single-instance mode

2. Exception agent, control the execution of the method.

AOP is programming for facets.

Design mode-Proxy mode