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This article introduces the relevant knowledge of "what is the concept of remote agent in web agent mode". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Remote agent

Of course, you can call the interface directly if the user and provider of the function are in the same thread, but if they are in different threads, or even on the same device, you need a proxy. Take a look at the class diagram first, which is a simplified version of the previous article.

LedDisplay is a simple Led large screen display class, while the function of RemoteDisplayProxy is to act as a proxy when LedDisplay is on other devices. If you only look at the class diagram, you may not see the agent, then look at the sequence diagram.

Because LedDisplay and Actor1 are in different devices, the calls to RemoteDisplayProxy by Actor1 are converted into different commands, which are sent to Stub,Stub in another device, and then the corresponding interface of LedDisplay is called according to the contents of the command. Stub receives the return value of LedDisplay and sends it to the RemoteDisplayProxy class, while Remote receives the return value and returns it to Actor1. During this time, the Actor1 thread has been in a blocking state. For Actor1, it is not necessary to distinguish which device the actual display device is on, but all use the interface of Proxy in the same way.

Although the above is illustrated by taking Actor1 and LedDisplay on different devices as an example, they are in roughly the same way when they are in different threads or processes, but with different means of communication.

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