Agent model for Java design pattern learning

Proxy mode: provides a proxy for other objects to control access to this object.

Agent mode structure diagram

Simulation demand: Xiao Zhang of class 3 likes Xiao Hong of class 1, but he doesn't know Xiao Hong. He entrusts Xiao Ming of class 1 to give Xiao Hong a gift.

1: Create an interface that both Xiao Zhang and Xiao Ming can implement.

2: Realize small Zhang to give gifts.

3: Realize Xiao Ming's gift from Xiao Zhang and transfer it to Xiao Hong.

4: Test class:

5: Console

Send little red dolls, little red flowers, little red chocolate

Summary:

Applicable scenarios of agent mode

1: Remote proxy is to provide local representation of an object in different address spaces. This can hide the fact that an object exists in different address spaces.

2: Virtual agent is to create expensive objects as needed. It is used to store real objects that take a long time to instantiate.

3: Security agent, which is used to control the access rights of real objects.

4: Intelligent guidance means that when a real object is called, the agent handles something else.

advantage:

1: The agent model can coordinate the caller and callee, and reduce the coupling degree of the system to a certain extent;

2: The proxy object can act as an intermediary between the client and the target object, which protects the target object.

Disadvantages:

1: Due to the addition of proxy objects between the client and the real object, some types of proxy modes may slow down the processing speed of requests;

2: Implementing the proxy pattern requires additional work, and the implementation of some proxy patterns is very complex.

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