Limit number of threads calling a method in Spring (Boot)

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We have a Spring Boot service like this:

@Service
public class XXXDataService {
    public XXXModel resolveData(){
    } 
}

The resolveData method fetches data from a datasource and returns it. In general it can handle several threads asking for data at the same time. But not more then n threads at the same time.

Is there a Spring-build-in solution to restrict the number of threads accessing a method.

Something like @Synchronized(maxParallelAccesses=10).

Hint 1: It is important that all the other Spring interceptors are also not fired, for example a transaction should not be started until the method is not blocked anymore.

Hint 2: I don't wan't to restrict the overall number of threads of the application but only having some kind of method synchronization with size > 1.

spring-boot interceptor multithreading spring java
1 Answers

I don't think Spring or even Java provides a build-in annotation to do that. But that logic can be implemented with a Semaphore:

@Service
public class XXXDataService {

    private Semaphore semaphore = new Semaphore(10);

    public XXXModel resolveData(){
        semaphore.acquire();
        //... logic accessible by max 10 threads concurrently
        semaphore.release();
    } 
}
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