6. Agency model of design pattern

Beiluo school 2021-01-22 13:03:04
agency model design pattern


The proxy pattern : Provides a proxy for other objects to control access to this object

When I first saw the definition of proxy pattern, it was , The code that comes to mind is const that = this;, We go through that To represent this The interview of , Although it doesn't reflect control The mean of , But it does agent It means .

In the daily development work , My understanding of the agency model is : Add filtering means to the operation of objects .

I met a scene in my work before : The platform management system needs to maintain the public data of each subsystem (CommonData), Each subsystem is used to pull public data , But pulling public data in this way is actually a big expense , Because public data changes slowly , The timeliness is relatively low , We can pull the function of public data through the proxy to operate . The code is as follows :

// Pull public data function

const getCommonData = async (type) => {
return await Ajax(type);
};
​
// Proxy functions
const CommonDataMap = new Map();
const getCommonDataProxy = async (type) => {
let data = CommonDataMap.get(type);
if (!data) {
data = await getCommonData(type);
CommonDataMap.set(type, data);
}
​
return data;
};

Use scenarios

  1. Remote agent : Provide local representation of an object in different address spaces , This hides the fact that an object has different address spaces
  2. Virtual agent : Create expensive objects as needed , It is used to store real objects that need a long time to be instantiated
  3. Security agent : Used to control , Permissions for real object access
  4. Intelligent guidance : When calling real objects , The agent deals with other things

My experience

In the front end , The scenarios I encounter or use proxy mode are :

  • You need to 、 Method is used to do a layer of filtering
  • You need to listen to certain classes 、 Methods are used and processed
  • some DOM Lazy loading ( For example, images are loaded lazily )
    • *
Reference resources

Big talk design patterns -- gemee

Personal blog

Beiluo school

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