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Today, the editor will share with you the relevant knowledge of how to understand the web agent model. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Intention

Provide an alternative mechanism for objects to achieve more transparent or less costly access.

motivation

For example, we have a stock trading information representation module, which accepts and represents the data from the communication module according to the pre-set color, the type of curve and other information. But a special requirement is that the physical location and number of screens that need to be represented can be customized. The simplest case is to show it directly on the computer that receives the data, or on the big screen on the trading floor, or both.

One possible way to solve this problem is to use the proxy object Proxy instead of the real display module. From the standpoint of the communication module, Proxy is a general display module, but its interior will handle different numbers and different types of screens. The following is the class diagram of this scheme.

First, Display defines the interface of the display device, which can be used to start and stop display, set colors and send data. Then LocalDispaly and LedDisplay implement these interfaces, which support computer screen display and LED large screen display respectively. Although the next RemoteDisplay implements the same interface, it does not provide the real display directly, but is responsible for sending commands to the remote display device. Finally, there is MultiDisplayProxy, which does not provide actual display capabilities, but can forward access to the display interface to other display objects logged in in advance.

According to the actual needs, customers can use the combination of these four classes to achieve multi-screen, multi-type, multi-location display function.

These are all the contents of this article entitled "how to understand the web Agent Mode". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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