Spring boot interface idempotent plug-in use

Cool zz 2020-11-09 12:00:47
spring boot interface idempotent plug-in

An overview of idempotent

  • Idempotency was originally a mathematical concept , Even if the formula :f(x)=f(f(x)) The mathematical nature of being able to establish . In the field of programming , To the same system , Use the same conditions , One request and repeated multiple requests have the same impact on system resources .

  • Idempotent is a very important concept in distributed system design , Interfaces with this property are always designed with such a concept : When an exception occurs in the calling interface and repeated attempts are made , It will always cause losses that the system can't bear , So we have to stop this phenomenon .

  • There are many ways to achieve idempotency , At present, the mechanism based on request token is widely used . Its core idea is to generate a unique certificate for each operation , That is to say token. One token There is only one execution right at each stage of the operation , Once the execution is successful, the execution result is saved . For repeated requests , The same result ( Report errors ) etc. . Reference resources 《 On idempotency 》

Idempotent processing implements

Join the rely on

port: 6379


@Idempotent(key = "#key", expireTime = 10, info = " Please do not repeat the inquiry ")
public String test(String key) {
return "success";


  • 10 Independent thread requests

  • Execute view results ,10 Only one request will succeed

  • Check background exception report error ,9 Exception error (s) met expectations

idempotent Note that

  • key: The unique identity of an idempotent operation , Use spring el expression use # To reference method parameters . If it can be blank, the current url + args Make the unique identification of the request

  • expireTime: The period of validity Default :1 The validity period should be longer than the program execution time , Otherwise, the request may come in

  • timeUnit: Time unit Default :s ( second )

  • info: Idempotent failure message , Customizable

  • delKey: Whether to delete after the business is completed key true: Delete false: Don't delete

Idempotent processing design principle

Process design reference

  • 1. Before the request begins , according to key Inquire about It turns out that : Report errors No results were found : Deposit in key-value-expireTime key=ip+url+args

  • 2. After request , Delete directly key No matter key Whether there is , Delete directly Whether or not to delete , Configurable

  • 3.expireTime Expiration time , Prevent a request from getting stuck , It will keep blocking , Beyond the expiration date , Automatically delete The expiration time is longer than the business execution time , It needs to be evaluated roughly ;

  • 4. This scheme is directly related to the interface request level .

  • 5. The expiration time needs to be greater than the business execution time , Otherwise, the business request 1 It's still in execution , The front end is not masked , Or users jump to the page and come back to make repeated requests 2, At the business level , The results are still not as expected .

  • 6. Suggest delKey = false. Even if the business is done , Don't delete key, Forced lock expireTime Time for . The prevention of 5 What happened .

  • 7. Realize the idea : The same request ip And interface , Requests with the same parameters , stay expireTime Many requests from within , Only one success is allowed .

  • 8. The page is masked , Database level unique index , Query first and then add , We should deal with it all .

  • 9. This annotation is only used for idempotent , Not for locks ,100 This kind of pressure test is carried out simultaneously , There will be problems , It doesn't make sense in this situation , In reality, users don't show up 1s perhaps 3s It was sent manually in 50 A or 100 Duplicate requests , Or under the weak network 100 Duplicate requests ;


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