use for CR

GreetingController.java

package com.backbase.interview.course.controller;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {

    private static Map<String, List<Long>> requests = new HashMap<>();

    @GetMapping("/myapi")
    public ResponseEntity<Object> greeting(@RequestParam(name = "client") String clientName) {
        Long currentTimestamp = System.currentTimeMillis();
        if (!requests.containsKey(clientName)) {
            requests.put(clientName, new LinkedList<>());
        }
        List<Long> clientRequests = requests.get(clientName);
        
        long numRequests = clientRequests.stream()
            .filter(x -> x >= currentTimestamp - 10000)
            .count();
        if (numRequests >= 3) {
            return ResponseEntity.status(HttpStatus.FORBIDDEN).build();
        }

        clientRequests.removeIf(x -> x < currentTimestamp - 10000);
        return ResponseEntity.ok().build();
    }


}